Feedback Patents (Class 84/DIG10)
  • Patent number: 6069309
    Abstract: A data compression method and apparatus for the compression of sound data utilized in digital sampling keyboard instructs. The present invention reduces memory requirements for sampled sounds without compromising sound quality, using three techniques. The third technique improves the defect of formant distortion when sampled sounds are transposed.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: May 30, 2000
    Assignee: Creative Technology Ltd.
    Inventors: Kevin J. Monahan, Donna L. Murray
  • Patent number: 6040516
    Abstract: There are provided a tone generator system using computer software and a storage medium storing the computer software. A musical tone synthesis module generates a musical tone signal by generating an excitation signal in response to an request for generating the excitation signal and at least delaying and looping the generated excitation signal. A first monitoring module monitors whether or not the request for generating the excitation signal is issued. A second monitoring module monitors whether or not the musical tone signal is generated by the musical tone synthesis module. An interruption module interrupts execution of the musical tone synthesis module when the first monitoring module detects that the request for generating the excitation signal is not issued, and at the same time the second monitoring module detects that the musical tone signal is not generated.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: March 21, 2000
    Assignee: Yamaha Corporation
    Inventor: Hideyuki Masuda
  • Patent number: 6034316
    Abstract: A sustainer is provided for prolonging the vibrations of strings of a stringed musical instrument. The instrument has at least one magnetic pickup means responsive to the vibrations of the strings. The pickup produces an output signal in response to the vibrations of the instrument strings. At least one control potentiometer provides the capability to control at least one parameter of the output signal. The sustainer comprises a string driver transducer capable of inducing vibrations in the strings, a sustainer amplifier having an input which accepts the pickup output signal, and an amplifier circuit which amplifies the pickup output signal to form a drive signal. The sustainer amplifier also has an output, from which the drive signal transfers sufficient energy to the string driver transducer to sustain the vibrations of the strings. A power supply provides electrical energy to the sustainer amplifier.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: March 7, 2000
    Inventor: Alan Anderson Hoover
  • Patent number: 5877446
    Abstract: A data compression method and apparatus for the compression of sound data utilized in digital sampling keyboard instruments. The present invention reduces memory requirements for sampled sounds without compromising sound quality, utilizing processing of sound data samples to delete sound data between the attack portion and just before the loop start portion. The improved method further includes a step of digitally splicing the remaining attack and loop portions to form a spliced data sample.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: March 2, 1999
    Assignee: Creative Technology, Ltd.
    Inventors: Kevin J. Monahan, Donna L. Murray
  • Patent number: 5834672
    Abstract: A method and apparatus for producing a tone (e.g. for music) without use of a waveform memory and using a feedback loop. The feedback loop includes a waveform generator which calculates, in real time, a parabolic approximation to a sine wave. The feedback loop includes a delay phase differencer to eliminate hunting. The output waveform from the feedback loop is provided to a sine function generator which approximates a sine value using a third order polynomial, to provide the output tone.
    Type: Grant
    Filed: November 9, 1995
    Date of Patent: November 10, 1998
    Assignee: Chromatic Research, Inc.
    Inventor: Avery L. Wang
  • Patent number: 5756919
    Abstract: A musical sound generating system not requiring a memory unit or interpolation device for generating a tone having a tone color including a large number of harmonic components. The tone is generated with few operations and ready predictability of tone color. The musical sound generating system includes an adder for phase modulating a carrier wave by adding modulating wave data to carrier wave phase angle data; a pseudo-sinusoidal wave operator for outputting a pseudo-sinusoidal wave in response to phase-modulated carrier wave phase angle data from the adder; and a multiplier for generating a tone signal by multiplying the pseudo-sinusoidal wave by amplitude coefficient data. The pseudo-sinusoidal wave operator controls modulation of the pseudo-sinusoidal wave in accordance with a function modulation coefficient that is supplied to the operator as an external parameter.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: May 26, 1998
    Assignee: Korg Inc.
    Inventors: Masato Adachi, Junichi Ikeuchi
  • Patent number: 5741994
    Abstract: A musical tone-synthesizing apparatus has a plurality of waveguide networks each including at least one waveguide, each of which has a closed loop in which a circulating signal circulates in response to an external excitation signal. The closed loop has an output through which the circulating signal is output as a waveguide output signal, and an input port through which a signal is input to be superposed on the circulating signal. A network output signal is formed based on the waveguide output signal. A connection means is connected to corresponding ones of the waveguide networks and carries out signal processing on the network output signal delivered from each of the corresponding waveguide networks, based on an external modulating signal, and inputs the resulting processed signal to the input port of the closed loop of each of the corresponding waveguide networks.
    Type: Grant
    Filed: February 27, 1996
    Date of Patent: April 21, 1998
    Assignee: Yamaha Corporation
    Inventor: Chifumi Takeuchi
  • Patent number: 5712439
    Abstract: A musical tone signal producing apparatus having a loop circuit portion including a filter circuit and a delay circuit for circulating therethrough a vibratory waveform signal to be produced as a musical tone signal and a control signal generator for generating a first control signal for effecting excitation of the waveform signal in the loop circuit and applying the first control signal to the filter circuit and for generating a second control signal for applying time variation to the waveform signal. The musical tone signal producing apparatus further includes a filter control circuit for modifying the second control signal based on the vibratory waveform signal and for applying a control parameter defined by the modified second control signal to the filter circuit for control of a signal transmission characteristic of the filter circuit.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: January 27, 1998
    Assignee: Yamaha Corporation
    Inventor: Kunimoto Toshifumi
  • Patent number: 5633473
    Abstract: The vibration of a vibratory element, caused by applying thereto a shock, is detected by a vibration sensor and provided as an electric shock signal to a resonance circuit. The resonance frequencies and resonance decay time of the resonance circuit can freely be adjusted. By setting the resonance frequencies and resonance decay time of the resonance circuit to arbitrary values, desired frequency components are extracted from the electric shock signal and output as a sound signal of an electronic musical instrument.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: May 27, 1997
    Assignee: Korg Incorporated
    Inventors: Yasuhiko Mori, Yoshihiro Suzuki, Iwao Hamaura
  • Patent number: 5619002
    Abstract: An apparatus and method for electronically producing music includes an adder coupled to a sinusoid memory, wherein the sinusoid memory is a look-up table including various sinusoidal waves having differing output characteristics. A feedback path between the output of the sinusoid memory and an input of the adder includes a register coupled to a feedback modifier device. The feedback modifier device includes a second look-up table which substitutes a feedback component .beta. into the sinusoidal wave output from the sinusoid memory. The output of the feedback modifier device is an arbitrary function of the selected wave from said sinusoid memory and the selected value of the feedback component.
    Type: Grant
    Filed: January 5, 1996
    Date of Patent: April 8, 1997
    Assignee: Lucent Technologies Inc.
    Inventor: Jeffrey A. Walck
  • Patent number: 5585588
    Abstract: A stringed instrument having a device for sustaining the vibration of a string; the stringed instrument being a musical instrument having plural strings with the mass and tension of each string being different, which has a pickup unit for detecting the vibration of a string, an amplifying unit for amplifying an electric signal detected by the pickup unit, an electromagnetic driver for emitting magnetic energy to drive a string by a driving signal output from the amplifying unit, and an excitation balance matching unit for providing well-balanced excitation to each of the plural strings and/or a magnetic flux emission controlling unit for increasing the quantity of magnetic flux emission in the direction of a string.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: December 17, 1996
    Assignee: Fernandes Co., Ltd.
    Inventor: Kenji Tumura
  • Patent number: 5532424
    Abstract: A tone generator for an electronic musical instrument analyzes an original waveform signal to store results of analysis thereof into a memory. The results of the analysis read out from the memory is interpolated to generate results of the interpolation in synchronism with each sampling clock. The results of the analysis are corrected to cancel a frequency characteristic to be imparted to the results of the analysis when they are interpolated. The results of the analysis are stored into the memory after having been converted. In another form, a reading numerical value formed of an integer part and a decimal part is generated, in synchronism with a predetermined clock timing. The numerical value is variable at a rate proportional to the pitch of a musical tone to be produced. Residual waveform samples read from the memory based on the integer part are interpolated by the use of the decimal part in synchronism with a predetermined clock timing.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: July 2, 1996
    Assignee: Yamaha Corporation
    Inventor: Suzuki Hideo
  • Patent number: 5521329
    Abstract: A musical tone synthesizing apparatus provides a closed loop containing an adder, a delay circuit, a filter and a gain control portion. The delay circuit has a delay time which is set responsive to a tone pitch of a musical tone to be produced. An excitation signal is produced in response to the musical tone to be produced and is introduced into the closed loop through the adder, so that the excitation signal circulates through the closed loop. The gain control portion is provided to control a loop gain of the closed loop on the basis of a preset parameter and another parameter which is controlled responsive to a tone color of the musical tone to be produced. The signal circulating through the closed loop is picked up as a musical tone signal representing the musical tone to be produced. By controlling the loop gain of the closed loop, an attenuation characteristic of the musical tone signal is controlled. Hence, it is possible to freely control a sounding time of a decay sound such as a guitar sound.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: May 28, 1996
    Assignee: Yamaha Corporation
    Inventors: Akira Yamauchi, Masashi Hirano
  • Patent number: 5496964
    Abstract: A tone generator for an electronic musical instrument is fundamentally configured by a drive-waveform creating portion and a closed loop. The drive-waveform creating portion creates a drive-waveform signal by mixing an excitation waveform and a noise waveform together. The drive-waveform signal is applied to the closed loop through an adder. The closed loop contains a plurality of feedback paths, each of which at least contains a delay circuit and an all-pass filter. The adder adds all of output signals of the feedback paths together with the drive-waveform signal so as to produce a musical tone signal. The number of delay stages, representing an amount of delay to be used in each delay circuit provided in each feedback path, is designated in response to a delay ratio which is arbitrarily set.
    Type: Grant
    Filed: March 24, 1994
    Date of Patent: March 5, 1996
    Assignee: Yamaha Corporation
    Inventor: Hideo Suzuki
  • Patent number: 5477004
    Abstract: A musical tone waveform signal generating apparatus in which a waveform signal is circulated to generate a musical tone waveform signal. The apparatus includes an excitation portion for mixing an excitation control signal with the waveform signal and for non-linearly converting the mixed waveform signal and a signal transmission portion coupled with the excitation portion to feed back the converted waveform signal to the excitation portion with delay of a predetermined time for causing on the converted waveform signal a resonance frequency corresponding with a pitch of a musical tone to be generated.
    Type: Grant
    Filed: February 22, 1995
    Date of Patent: December 19, 1995
    Assignee: Yamaha Corporation
    Inventor: Toshifumi Kunimoto
  • Patent number: 5451711
    Abstract: A musical tone waveform signal generating apparatus in which a waveform signal is circulated to generate a musical tone waveform signal. The apparatus includes an excitation portion for mixing an excitation control signal with the waveform signal and for non-linearly converting the mixed waveform signal and a signal transmission portion coupled with the excitation portion to feed back the converted waveform signal to the excitation portion with delay of a predetermined time for causing on the converted waveform signal a resonance frequency corresponding with a pitch of a musical tone to be generated.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: September 19, 1995
    Assignee: Yamaha Corporation
    Inventor: Toshifumi Kunimoto
  • Patent number: 5449858
    Abstract: A sound effects device is used with a guitar having an electromagnetic pickup for inducing feedback into an original signal source for creating a unique musical sound. The device comprises a coil winding which is placed on a hand or wrist of a player for maneuvering the hand in proximity to the guitar pickup. In an alternate arrangement, the coil is affixed to a stand and the guitar is maneuvered by the player for placing the guitar pickup close to the coil. The player thus creates new and pleasing sounds by changing relative positions of the guitar and device in proximity to each other thus allowing for an enhanced unrestricted performance.
    Type: Grant
    Filed: December 30, 1993
    Date of Patent: September 12, 1995
    Assignees: Edward E. Haddock, Jr., James W. Heavener
    Inventors: Hunter W. Menning, Jonathan D. Phelps
  • Patent number: 5448010
    Abstract: A tone generation system includes one or more digital waveguide networks coupled to one or more junctions, one of which receives a control signal for controlling tone generation. The control signal initiates and interacts with a wave signal propagating through the waveguide networks to form a tone signal. A non-linear junction may be employed which receives a signal from a waveguide, converts it in accordance with a non-linear function based upon the value of the control signal and provides it back to the waveguide. A tone signal whose pitch is determined by the wave transmission characteristics of the waveguide network is thereby produced.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: September 5, 1995
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventor: Julius O. Smith, III
  • Patent number: 5432296
    Abstract: The musical tone synthesizing apparatus is mainly configured by a closed loop which at least provides a delay circuit and an all-pass filter. The delay circuit delays an input signal (e.g., excitation wave signal) by a first delay time corresponding to a certain integral number of sampling periods. The all-pass filter functions to at least delay an output of the delay circuit by a second delay time corresponding to a decimal fraction of the sampling period, so that an output of the all-pass filter is fed back to the delay circuit. The whole delay time of the closed loop consists of the first and second delay times which can be respectively controlled. Thus, a musical tone signal representing a synthesized musical tone (e.g., an attenuating sound which is produced from an percussion instrument) is picked up from the closed loop. Incidentally, the whole configuration of the closed loop can be embodied by a digital signal processor (DSP).
    Type: Grant
    Filed: August 18, 1993
    Date of Patent: July 11, 1995
    Assignee: Yamaha Corporation
    Inventors: Chifumi Takeuchi, Iwao Higashi
  • Patent number: 5428185
    Abstract: A musical tone synthesizing apparatus synthesizes musical tones by simulating the tone generation construction of an acoustic musical instrument. The acoustic musical instrument comprises of a tone generating element and a tone generating operator for exciting the tone generating element, thereby creating reciprocally propagating vibration within the tone generating element. The musical tone synthesizing apparatus has a parameter producing portion which automatically produces a plurality of control parameters used for controlling a simulation of the acoustic musical instrument in response to operational information representing the operation applied to the acoustic musical instrument by a performer, musical tone synthesizing portion which synthesizes a musical tone of the acoustic musical instrument, wherein the operation of the musical tone synthesizing portion is controlled in accordance with the control parameters. The parameter producing portion includes, for example, keyboard apparatus having a keyboard.
    Type: Grant
    Filed: August 24, 1993
    Date of Patent: June 27, 1995
    Assignee: Yamaha Corporation
    Inventors: Toshifumi Kunimoto, Mitsuru Fukui
  • Patent number: 5408042
    Abstract: When playing a wind instrument such as a clarinet, noises are inevitably or intentionally generated under effect of a turbulent flow contained in an air-pressure wave propagated through a resonance tube of the wind instrument. In response to an accurate simulation of a noise behavior, particularly, a behavior of the turbulent flow contained in the air-pressure wave, a musical tone synthesizing apparatus artificially produces a noise signal by use of a white-noise signal having the predetermined uniform spectral distribution. Herein, frequency characteristic and amplitude characteristic of this noise signal are controlled to be varied in response to an excitation signal which is created responsive to performance information representing the breath pressure applied to a mouthpiece of the wind instrument. This excitation signal is delayed by the predetermined delay time while it is circulating through a loop circuit.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: April 18, 1995
    Assignee: Yamaha Corporation
    Inventor: Hideyuki Masuda
  • Patent number: 5382751
    Abstract: An electronic musical instrument includes an excitation signal generating device, a plurality of loop circuits and a coupling circuit. The excitation signal generating device generates an excitation signal in accordance with musical tone designating information. Each of the plurality of loop circuits at least delays an input signal in response to the musical tone designating information and repeatedly circulates the input signal therein. The excitation signal generated by the excitation signal generating device is supplied to at least one of the plurality of loop circuits as an input signal. The coupling circuits couples the plurality of loop circuits in accordance with a predetermined coupling form. At least one signal circulated in at least one of the plurality of loop circuits is output as a musical tone signal to be generated. The electronic musical instrument further includes a memory circuit which stores a plurality of coupling forms.
    Type: Grant
    Filed: December 1, 1992
    Date of Patent: January 17, 1995
    Assignee: Yamaha Corporation
    Inventors: Toru Kitayama, Iwao Higashi
  • Patent number: 5378850
    Abstract: An electric stringed instrument comprises an electromagnetic pickup having a permanent magnet and a string signal detecting coil wound around the permanent magnet and magnetically combined with the permanent magnet, an electromagnetic force producing unit having a driving coil to produce a magnetic force and being placed in the neighborhood of the electromagnetic pickup, and an adjusting unit provided with a part of a current flowing in the driving coil of the electromagnetic force producing unit and disposed at a place magnetically combined with the string signal detecting coil of the electromagnetic pickup. One induced electromotive force caused by magnetic flux from the adjusting unit and another induced electromotive force caused by magnetic flux from the electromagnetic force producing unit negate each other in the string signal detecting coil.
    Type: Grant
    Filed: January 12, 1993
    Date of Patent: January 3, 1995
    Assignee: Fernandes Co., Ltd.
    Inventor: Kenji Tumura
  • Patent number: 5359146
    Abstract: A musical tone synthesizing apparatus provides a time-varying signal processing circuit the transfer function of which gradually varies over time in order to gradually vary over time the tone color of a synthesized musical tone. A number of time-varying signal processing circuits are presented. An interpolation-type-time-varying signal processing circuit is provided with interpolators for interpolating control parameters generated based on a desired musical tone, a signal processing circuit carrying out a signal operation based on the interpolated control parameters on an input signal incomming thereto.
    Type: Grant
    Filed: February 19, 1992
    Date of Patent: October 25, 1994
    Assignee: Yamaha Corporation
    Inventors: Tomoyuki Funaki, Iwao Higashi, Toru Kitayama, Hideyuki Masuda, Toshifumi Kunimoto
  • Patent number: 5352849
    Abstract: A musical tone synthesizing apparatus is designed to simulate a physical phenomenon of a non-electronic musical instrument providing a sound generating element and an activating element. Herein, the sound generating element has its specific resonance characteristic, while the activating element imparts an excitation vibration to the sound generating element. This apparatus contains a plurality of loop circuits each including at least one delay element, wherein these loop circuits are connected together such that a signal picked up from one loop circuit is introduced into another loop circuit. This signal circulating through each loop circuit is delayed by a delay time which is controlled by a predetermined parameter corresponding to a desirable musical tone to be generated. In addition, an excitation signal, corresponding to the excitation vibration, is applied to at least one of the loop circuits.
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: October 4, 1994
    Assignee: Yamaha Corporation
    Inventor: Kaoru Kobayashi
  • Patent number: 5340942
    Abstract: A musical tone synthesizing apparatus conducts musical tone synthesis based on the tone generation mechanism of an acoustic musical instrument, and generates quickly and accurately desired musical tones in response to the operation of the beginning of tone generation. The musical tone synthesizing apparatus includes a performance data generation mechanism which generates performance data in accordance with performance operations, an excitation circuit, which generates an excitation signal in correspondence with the performance data, and a signal loop circuit which delays the excitation signal by a fixed period and repeatedly cycles the excitation signal. The performance data generation mechanism, furthermore, supplies an initial excitation control signal, which is for the purpose of exciting the signal loop circuit, to the excitation circuit during the initial generation of a musical tone.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: August 23, 1994
    Assignee: Yamaha Corporation
    Inventor: Toshifumi Kunimoto
  • Patent number: 5332862
    Abstract: A musical tone synthesizing apparatus includes a linear operation device, a non-linear operation device and a musical tone modification device. When the linear operation device receives a progressive wave signal, the device progresses and delays the signal, and outputs the progressed and delayed signal. The non-linear operation device varies the signal outputted by the linear operation device according to a musical tone control signal, and generates the varied signal as a new progressive wave signal. The musical tone modification device receives a plurality of signals extracted from the linear operation device or the non-linear operation device, creates a first signal and a second signal based on the plurality of signals, varying the first signal in accordance with the second signal, and provides the varied first signal as a musical tone signal to be synthesized.
    Type: Grant
    Filed: October 7, 1992
    Date of Patent: July 26, 1994
    Assignee: Yamaha Corporation
    Inventors: Masahiro Kakishita, Toshifumi Kunimoto
  • Patent number: 5308918
    Abstract: The present invention provides a signal delay circuit for substantially steplessly changing a delay interval. The signal delay circuit is composed essentially of a delay controller, a first delay circuit, and a second delay circuit. The delay controller generates and outputs control data consisting of a real number bearing control information for controlling the delay interval, the real number consists of an integral portion and a fractional portion. The first delay circuit receives an incidental signal, delays the incidental signal for creating a first intermediate signal, and outputs the first intermediate signal, the first intermediate signal being delayed with respect to the incidental signal by an interval which is a product of a predetermined cardinal interval and the integral portion of the real number.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: May 3, 1994
    Assignee: Yamaha Corporation
    Inventors: Akira Yamauchi, Toshifumi Kunimoto, Chifumi Takeuchi, Iwao Higashi
  • Patent number: 5292999
    Abstract: An electric stringed instrument having a device for sustaining the vibration of the string including an electromagnetic pickup for converting the vibration of the string to an electric signal, an amplifying device for amplifying the electric signal, and an electromagnetic driver for converting the amplified signal to a driving force to thereby drive the string. The electromagnetic pickup and the electromagnetic driver are placed at a right angle or a predetermined angle of inclination relative to each other so that induced electromotive forces caused by magnetic flux from the electromagnetic driver negate each other or do not occur in the electromagnetic pickup to thereby reduce the magnetic feedback in the device.
    Type: Grant
    Filed: August 13, 1992
    Date of Patent: March 8, 1994
    Assignee: Fernandes Co., Ltd.
    Inventor: Kenji Tumura
  • Patent number: 5290969
    Abstract: A musical tone synthesizing apparatus generates musical tones by simulating the tone generation construction of a plucked-stringed instrument or percussion type stringed instrument. The apparatus has a plurality of closed loop circuits which simulate each tone generating element of the instrument, an excitation circuit which creates an excitation signal corresponding to the excitation given to the plurality of tone generating elements in response to the operation of a tone generating operator or the operational information of the tone generating operator, and a memory which stores a non-linear relation between the tone generating elements and the tone generating operator such as a hammer. The excitation signal is supplied to each of the closed loop circuits and circulates around each closed loop circuit and is delayed by means of a delay circuit having delay interval, and is fed back into the excitation circuit as the state of the tone generating elements.
    Type: Grant
    Filed: November 28, 1990
    Date of Patent: March 1, 1994
    Assignee: Yamaha Corporation
    Inventor: Kaoru Kobayashi
  • Patent number: 5286915
    Abstract: An electronic musical instrument for realizing touch at the time of the manipulating of a manipulator such as a keyboard faithfully reflected on the resulting musical tone. The electronic musical instrument has acceleration pickups respectively attached to keys in the keyboard, and tone synthesizing portions respectively driven on the basis of signals obtained by integrating acceleration detection signals outputted from the acceleration pickups.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: February 15, 1994
    Assignee: Yamaha Corporation
    Inventors: Takeshi Komano, Toshifumi Kunimoto
  • Patent number: 5286914
    Abstract: A musical tone waveform signal generating apparatus in which a waveform signal is circulated to generate a musical tone waveform signal. The apparatus includes an excitation portion for mixing an excitation control signal with the waveform signal and for non-linearly converting the mixed waveform signal and a signal transmission portion coupled with the excitation portion to feed back the converted waveform signal to the excitation portion with delay of a predetermined time for causing on the converted waveform signal a resonance frequency corresponding with a pitch of a musical tone to be generated.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: February 15, 1994
    Assignee: Yamaha Corporation
    Inventor: Toshsifumi Kunimoto
  • Patent number: 5286916
    Abstract: Tone generation in conformity with the tone generating mechanism of actual rubbed string instruments is made to obtain musical tones rich in reality as generated by natural musical instruments. Performance information outputted from a performance manipulator is converted into tone generation parameter by parameter generating means. Excitation means generate an excitation signal corresponding to the string-rubbing style on the basis of the tone generation parameter. A loop circuit gives both acoustic and propagation delay of the string to the excitation signal to thereby generate musical tone signals.
    Type: Grant
    Filed: January 14, 1992
    Date of Patent: February 15, 1994
    Assignee: Yamaha Corporation
    Inventor: Akira Yamauchi
  • Patent number: 5278350
    Abstract: An electronic musical instrument suitable for synthesizing musical tones, comprises a musical tone control apparatus for generating velocity data and a musical tone generator for generating a musical tone signal having musical tone characteristics according to the velocity data. The musical tone control apparatus comprises an operation member which can be movably operated, a detector for detecting operation data according to an operation position or displacement amount of the operation member along its moving direction, a conversion memory for converting the operation data outputted from the detector into velocity data, and a control circuit for controlling musical tone characteristics on the basis of the velocity data outputted from the conversion memory.
    Type: Grant
    Filed: February 9, 1993
    Date of Patent: January 11, 1994
    Assignee: Yamaha Corporation
    Inventors: Tetsuo Okamoto, Satoshi Usa, Itsurou Kubota
  • Patent number: 5272275
    Abstract: A tone signal synthesizer for simulating musical tones of a brass instrument faithfully. A nonlinear portion and a pipe linear portion are combined to simulate a brass instrument. The nonlinear portion has a resonance circuit having a resonance frequency in the vicinity of the frequency of a musical tone on the basis of an upper model, and a resonance circuit having a low resonance frequency on the basis of an outer model. Not only oscillation in the frequency of the musical tone is made by the former, but the instability of a brass instrument upon starting of tone generation is simulated by the latter. Further, not only a random number generation circuit gives a random number component to a flow rate signal, but a function table and a multiplier make the level of the random number component proportional to the square root of the flow rate signal.
    Type: Grant
    Filed: April 7, 1992
    Date of Patent: December 21, 1993
    Assignee: Yamaha Corporation
    Inventor: Toshifumi Kunimoto
  • Patent number: 5266737
    Abstract: A musical tone control apparatus controls an electronic musical instrument which simulates a natural musical instrument such as a bowed instrument. The apparatus includes an operator which can be movably operated in a predetermined direction and simulates a bow, a converter which stores a plurality of nonlinear characteristics. The nonlinear characteristics represent a relation between pressure signal which is added on the operator by a player and control pressure signal which simulates real rubbing pressure added on the string. To realize real performance by the bow, the converter converts the pressure signal into the control pressure signal to be changed in accordance with the position of the operator even if the pressure signal is constant.
    Type: Grant
    Filed: December 31, 1990
    Date of Patent: November 30, 1993
    Assignee: Yamaha Corporation
    Inventor: Tetsuo Okamoto
  • Patent number: 5266734
    Abstract: A musical tone synthesizing apparatus includes an excitation circuit, a resonator circuit, and a resampler. The excitation circuit generates an excitation signal, through a non-linear transformation, in response to an input signal supplied thereto. The resonator circuit resonates the excitation signal supplied thereto. The signal processing in the excitation circuit is executed in synchronization with a high sampling frequency N*Fs. The resampler converts the excitation signal of the high sampling frequency N*Fs into that of a normal frequency Fs. The excitation signal from the resampler, which has the normal sampling frequency Fs, is supplied to the resonator circuit. Accordingly, the resonator circuit can perform its operation at the normal sampling frequency Fs. The high-speed operation of the excitation circuit prevents the abnormal oscillation and the generation of an aliasing noise in the musical tone synthesizing apparatus.
    Type: Grant
    Filed: March 24, 1992
    Date of Patent: November 30, 1993
    Assignee: Yamaha Corporation
    Inventors: Takeshi Komano, Toshifumi Kunimoto
  • Patent number: 5264659
    Abstract: A musical tone synthesizing apparatus is designed to simulate sounds of the non-electronic musical instrument, particularly the wind instrument. Herein, a wave-guide network and an excitation-vibration portion are connected together in a closed-loop. The wave-guide network is configured by plural bi-directional transmission circuits each at least providing a delay element, while the excitation-vibration portion provides a feedback loop between its input/output terminals. The feedback rate of this feedback loop is adjusted by a control signal supplied from an external device. By merely varying this control signal, it is possible to change the resonance frequency and also vary the width of the hysteresis curve representing the input/output characteristics of the excitation-vibration portion. When simulating the sounds of the wind instrument, the control signal corresponds to the blowing pressure applied to the mouthpiece of the wind instrument.
    Type: Grant
    Filed: April 22, 1992
    Date of Patent: November 23, 1993
    Assignee: Yamaha Corporation
    Inventor: Toshifumi Kunimoto
  • Patent number: 5264658
    Abstract: An electronic musical instrument includes an excitation circuit, a closed loop circuit, a characteristics analysis circuit and a control circuit. The excitation circuit generates an excitation signal in response to performance information. The closed loop circuit causes the excitation signal inputted from the excitation circuit to circulate thereabout musical tone signal. The closed loop circuit also has a delay circuit for delaying the musical tone signal for a predetermined time. The characteristics analysis circuit analyzes an input signal and generates a control signal corresponding to the result of the analysis of the input signal. The control circuit controls characteristics of the musical tone signal circulating in the closed loop circuit in response to the control signal. The musical tone signal circulating in the closed loop circuit is then outputted therefrom as a sound signal.
    Type: Grant
    Filed: October 17, 1991
    Date of Patent: November 23, 1993
    Assignee: Yamaha Corporation
    Inventors: Yasuyuki Umeyama, Iwao Higashi
  • Patent number: 5262586
    Abstract: A grand piano is equipped with a sound controller for controlling qualities of a sound to be produced in a sound board and top boards of the grand piano, and the sound controller comprises a parameter switches for providing parameters indicative of qualities of a modified sound, sensors for detecting the qualities of the sound originally produced in the boards, a data processor responsive to the parameters for producing an actuating signal, and actuators associated with the boards for producing additional vibrations therein, wherein the additional vibrations are overlapped with the vibrations originally produced so that composite vibrations with the qualities indicated by the parameters take place in the boards, thereby controlling the acoustic sounds.
    Type: Grant
    Filed: February 19, 1992
    Date of Patent: November 16, 1993
    Assignee: Yamaha Corporation
    Inventors: Yasuhiko Oba, Yoshinori Suzuki, Hiroshi Umeji, Masahiro Wada, Satoshi Inoue
  • Patent number: 5256830
    Abstract: A musical tone synthesizing apparatus is designed to simulate the acoustic sounds of non-electronic musical instruments. In the non-electronic musical instrument providing the resonator such as the piano and guitar, the produced acoustic sound contains three kinds of sounds, i.e., a direct sound, a resonant sound and a transient sound. Herein, the direct sound is produced directly by playing the instrument, the resonant sound is produced from the resonator based on the direct sound and the transient sound is produced when the impulse to be occurred by playing the instrument propagates through the resonator. Thus, signals simulating these sounds respectively are mixed together so as to produce the synthesized musical tone signal, which well-simulates the acoustic sound.
    Type: Grant
    Filed: September 11, 1990
    Date of Patent: October 26, 1993
    Assignee: Yamaha Corporation
    Inventors: Chifumi Takeuchi, Toshifumi Kunimoto
  • Patent number: 5252776
    Abstract: A musical tone generating apparatus comprises an excitation signal generator, a signal processing device and loop gain controller. The signal processing device is electrically connected in a closed feedback loop with the excitation signal generator, via a delay unit. The loop gain controller controls gain of said closed feedback loop according to a lapse of time.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: October 12, 1993
    Assignee: Yamaha Corporation
    Inventor: Takaaki Mutoh
  • Patent number: 5248844
    Abstract: A musical tone synthesizing apparatus which synthesizes a musical tone signal in response to the wind instrument, brass instrument and the like provides an excitation circuit and a resonance circuit. The excitation circuit simulates the operations of the reed, mouth-piece and the like, while the resonance circuit which operates as the bi-directional transmission path simulates the resonance tube. The excitation signal generated from the excitation circuit is transmitted through the resonance circuit consisting of delay circuits and junction circuits. Thereafter, the transmitted signal is reflected by the terminal portion, and the reflected signal is transmitted through the resonance circuit and then fed back to the excitation circuit. Thus, the excitation signal is circulated in the loop consisting of the excitation circuit and resonance circuit. Based on the signal picked up from this loop, it is possible to obtain the synthesized musical tone signal which simulates the wind instrument tone and the like.
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: September 28, 1993
    Assignee: Yamaha Corporation
    Inventor: Toshifumi Kunimoto
  • Patent number: 5248845
    Abstract: An electronic music system which imitates acoustic instruments addresses the problem wherein the audio spectrum of a a recorded note is entirely shifted in pitch by transposition. The consequence of this is that unnatural formant shifts occur, resulting in the phenomenon known in the industry as "munchkinization." The present invention eliminates munchkinization, thus allowing a substantially wider transposition range for a single recording. Also, the present invention allows even shorter recordings to be used for still further memory improvements. An analysis stage separates and stores the formant and excitation components of sounds from an instrument. On playback, either the formant component or the excitation component may be manipulated.
    Type: Grant
    Filed: March 20, 1992
    Date of Patent: September 28, 1993
    Assignee: E-mu Systems, Inc.
    Inventors: Dana C. Massie, David P. Rossum
  • Patent number: 5247131
    Abstract: An electronic musical instrument capable of achieving a variety of performance mode. A manipulation region to be played with a hand manipulator is divided into regions of different performance modes. Tone signal parameters are generated differently depending on the selection of the performance region. Tone generator generates musical tone signals based on the tone signal parameters. The tone signal parameters are determined based on coordinate information on the manipulation region designated by the hand manipulator and pressure information applied on the coordinate position by the hand manipulator. The tone signal parameters comprise velocity information, pressure information and tone pitch information.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: September 21, 1993
    Assignee: Yamaha Corporation
    Inventors: Tetsuo Okamoto, Eiichiro Aoki, Satoshi Usa
  • Patent number: 5245127
    Abstract: The present invention provides a signal delay circuit for substantially steplessly changing a delay interval. The signal delay circuit is composed essentially of a delay controller, a first delay circuit, and a second delay circuit. The delay controller generates and outputs control data consisting of a real number bearing control information for controlling the delay interval, the real number consists of an integral portion and a fractional portion. The first delay circuit receives an incidental signal, delays the incidental signal for creating a first intermediate signal, and outputs the first intermediate signal, the first intermediate signal being delayed with respect to the incidental signal by an interval which is a product of a predetermined cardinal interval and the integral portion of the real number.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: September 14, 1993
    Assignee: Yamaha Corporation
    Inventors: Akira Yamauchi, Toshifumi Kunimoto, Chifumi Takeuchi, Iwao Higashi
  • Patent number: 5241129
    Abstract: An object of the present invention is to provide an electronic musical instrument which can generate a plurality of tones in spite of the inexpensive and simple structure thereof and can correct the quantity of phase delay of a closed loop in a physical model tone generator without use of any special processor such as a high-speed CPU or a dedicated numerical operation processor, not only to thereby attain performance effects of echo, chorus and the like but to simulate a performance style of repeating the operation of one string or key in the condition in which a tone corresponding to the string or key remains, without production of noise even when parameters for constituent elements of the physical model tone generator are respectively changed widely. The electronic musical instrument includes a driving waveform for storing a plurality of driving waveform data corresponding to performance information in advance, and a closed loop constituted by a shift register and a low-pass filter.
    Type: Grant
    Filed: February 11, 1992
    Date of Patent: August 31, 1993
    Assignee: Yamaha Corporation
    Inventors: Takaaki Muto, Chifumi Takeuchi
  • Patent number: 5241127
    Abstract: The musical tone synthesizing apparatus simulating the musical tones of a natural musical instrument such as a piano. The apparatus contains a closed-loop circuit for simulating the vibration mechanism of the strings and a excitation circuit for generating excitation signals to the closed-loop circuit, so that the excitation circuit simulates the hammer striking the string. The apparatus also contains a scaling coefficient generating circuit for generating and supplying scaling coefficients to the excitation circuit, where the scaling coefficients represent the influence rate corresponding to the influence to be applied to the hammer by the string. In the excitation circuit, the excitation signals are multiplied by the scaling coefficients so that a slight difference of tone color is applied to the excitation signals with respect to tone pitch (or each key).
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: August 31, 1993
    Assignee: Yamaha Corporation
    Inventor: Kaoru Kobayashi
  • Patent number: 5233123
    Abstract: A musical instrument such as a guitar including a structure such as a guitar body and a vibratory element such as one or more guitar strings mounted to the structure is provided with a pickup for detecting vibrating motion of the vibratory element and providing a pickup signal representing such vibration and having a predetermined phase relationship thereto. A driver is provided for applying a drive force to the vibratory element or string so that the drive force has a predetermined phase element relationship to a drive signal. A feedback circuit accepts the pickup signal and provides a drive signal to the driver in such fashion that the drive force supplied by the driver is substantially in phase with the vibration. Thus, the feedback circuit may be arranged to accept the pickup signal and convert the pickup signal to the drive signal so that, for at least some frequencies of the pickup signal, the drive signal differs in phase from the pickup signal.
    Type: Grant
    Filed: February 14, 1992
    Date of Patent: August 3, 1993
    Inventors: Floyd D. Rose, Steven M. Moore, Richard W. Knotts
  • Patent number: 5229536
    Abstract: In a musical tone synthesizing apparatus which synthesizes sounds of a non-electronic musical instrument containing a sound-generation element and an activating element, there is provided a loop circuit and an excitation circuit. In case of the piano, the sound-generation element and activating element respectively correspond to its string and hammer. On the basis of the operation of the activating element, the excitation circuit computes a relative displacement between the sound-generation element and activating element. Based on the computed relative displacement and its variation in a lapse of time, repulsion force applied between them is computed under consideration of the elastic characteristic and viscous characteristic of the activating element. Thereafter, the excitation circuit outputs an excitation signal, corresponding to the computed repulsion force, to the loop circuit so as to simulate the sound-generation mechanism of the non-electronic musical instrument.
    Type: Grant
    Filed: June 19, 1991
    Date of Patent: July 20, 1993
    Assignee: Yamaha Corporation
    Inventor: Toshifumi Kunimoto