Foot Control Patents (Class 84/721)
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Patent number: 10923090Abstract: A music pedalboard having a built-in patch cord and designed for use with a plurality of effects pedals is provided. The pedalboard includes a board designed to receive a first set of effects pedals arranged along a first row on the board and a second set of effects pedals arranged along a second row on the board, and a patch cord coupled to the bottom face of the board and having a first end coupled to a first side face of the board and a second end coupled to a second opposing side face of the board. The first end of the patch cord operably connects to an output of a last effects pedal in the first set of effects pedals and the second end of the patch cord operably connects to an input of a first effects pedal in the second set of effects pedals.Type: GrantFiled: April 17, 2020Date of Patent: February 16, 2021Inventor: Frank Dale Boxberger
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Patent number: 10468003Abstract: An audio foot pedal having an activation arrangement comprising a control button and a stationary part, the control button being secured to the stationary part for relative movement along a travel range, the activation arrangement providing a control signal in response to movement of said control button, the audio foot pedal further comprising at least one signal processing arrangement arranged to execute at least two different functional modes, wherein at least one of said functional modes, in response to said control signal, variably controls a signal processing of audio signals communicated to said at least one signal processing arrangement thereby producing an audio output signal to an audio output, and wherein said control signal also controls switching between said at least two functional modes.Type: GrantFiled: October 30, 2017Date of Patent: November 5, 2019Assignee: MUSIC Tribe Global Brands Ltd.Inventor: Thomas Sirius Andersen
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Patent number: 8957297Abstract: In one embodiment, a programmable pedalboard for a musical instrument is provided. The pedalboard includes a docking station for receiving a removable portable computer that provides a plurality of instrument effects. The docking station is configured to receive an audio signal from a musical instrument and to modify the audio signal from the musical instrument based on at least one instrument effect from the plurality of instrument effects.Type: GrantFiled: June 12, 2013Date of Patent: February 17, 2015Assignee: Harman International Industries, Inc.Inventors: Robin M. Urry, John D. Hanson, James D. Pennock, James E. Lambrick, William E. Clements
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Patent number: 8895831Abstract: An electronic piano includes a tone signal synthesizing system implemented by software, keys and key sensors monitoring the keys and reporting the key positions to the tone signal synthesizing system, and the tone signal synthesizing system includes damper model calculating modules for determining resistance against vibrations of wires of an a piano, a hammer model calculating module for determining force exerted on the wires, string model calculating modules for determining force exerted on an instrument body of the piano by the wires on the basis of the resistance and force exerted on the wires, an instrument body model calculating module for determining displacements of instrument body on the basis of the force exerted on the instrument body and an air model calculating module for determining a sound pressure at an observation point from the displacement of instrument body.Type: GrantFiled: December 8, 2011Date of Patent: November 25, 2014Assignee: Yamaha CorporationInventor: Eiji Tominaga
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Patent number: 8785758Abstract: An electronic hi-hat cymbal controller is disclosed. The controller includes a hi-hat cymbal stand with a foot pedal configured and arranged to mechanically lift a control shaft. A lower cymbal is supported by the hi-hat cymbal stand. An upper cymbal is supported by the control shaft and oriented over the lower cymbal. And a position detector is configured and arranged to detect the position of the control shaft relative to the hi-hat cymbal stand.Type: GrantFiled: August 30, 2011Date of Patent: July 22, 2014Assignee: InMusic Brands, Inc.Inventor: Jan Wissmuller
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Patent number: 8686275Abstract: A piano is equipped with an actuator that moves the piano pedal mechanism in a manner that reproduces the pedaling effects of an original performance with high accuracy. The actuator comprises a solenoid, a permanent magnet, a velocity sense coil, and a Hall-effect sensor. The Hall-effect sensor provides an indication of the displacement of the solenoid plunger in accordance with an inverse-square law. Closed-loop feedback control is provided to effect a very true reproduction of pedaling effects. Automatic calibration allows for simple installation.Type: GrantFiled: January 15, 2008Date of Patent: April 1, 2014Inventor: Wayne Lee Stahnke
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Patent number: 8680390Abstract: Highly expressive and flexibly programmable foot-operated controllers are described. Specific implementations are intended for musical applications and allow musicians an unprecedented degree of control of a wide variety of musical components and subsystems for recording and/or performance.Type: GrantFiled: October 14, 2010Date of Patent: March 25, 2014Assignee: Kesumo LLCInventors: Keith McMillen, Conner Lacy
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Patent number: 8624099Abstract: A foot control for control of musical effects from a musical instrument, the instrument having an electrical signal output operable to send signals to a speaker system, the control having a housing with at least one side wall; a roller rotatably mounted in the housing, a roller surface portion exposed and extending away from the housing for contact by a foot, to enable rotation of the roller by the foot; and, circuitry within the base connectable with the instrument and operable in response to rotation of the roller, to vary signals from the instrument.Type: GrantFiled: November 22, 2011Date of Patent: January 7, 2014Inventor: Andrew T Osborne
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Patent number: 8546676Abstract: A pedal device for an electronic percussion instrument, including: a base; a foot board supported at its first end portion to the base and configured to pivot by depression; an arm rotatably supported at its first end at a pivot point located near to a second end portion of the foot board, the arm being pivotable about the pivot point; a mass portion provided near to a second end of the arm; a regulating portion for regulating a locus of displacement of the mass portion when the foot board is moved from a depression start position to a depression end position; and a stopper portion provided on the base for defining the depression end position by contacting the mass portion in a forward stroke of depression, the regulating portion regulating the locus of the displacement of the mass portion so as not to contain a downward component in the forward stroke.Type: GrantFiled: September 20, 2011Date of Patent: October 1, 2013Assignee: Yamaha CorporationInventor: Ryuji Hashimoto
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Patent number: 8525015Abstract: A DC battery powered sound effect pedal housing with sound effect circuitry mounted therein and a battery terminal connector for being connected to battery terminals for powering the circuitry, a base and an adapter frame removably mounted intermediate the housing and the base with the adapter having said frame and an adapter power cord mounted to frame for transmitting DC power to the battery terminal connector whereby a conventional DC battery power sound effect pedal is converted to one being powered from an online AC power source without physically changing the base and housing. A convention power cord is used be powered from an AC power source to provide a DC power output that is plugged into the jack of the adapter power cord.Type: GrantFiled: May 23, 2011Date of Patent: September 3, 2013Inventor: Timothy D. Armstrong
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Patent number: 8509692Abstract: Disclosed is a system and method for the real-time wireless transmission of a digital audio signal and control data. A transmitter may be coupled to an audio source. The transmitter includes a processor to combine control data with a digital audio signal from the audio source and the processor wirelessly transmits the combined control data and digital audio signal to a receiver. The receiver includes a processor that is used to receive the combined control data and digital audio signal and to process the control data to perform a user pre-defined function.Type: GrantFiled: April 13, 2009Date of Patent: August 13, 2013Assignee: Line 6, Inc.Inventors: Marcus Ryle, Guy Coker
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Patent number: 8471136Abstract: An effects pedal including a first stage configured to asymmetrically limit an input signal, and a second stage configured to symmetrically clip the asymmetrically limited signal.Type: GrantFiled: January 31, 2011Date of Patent: June 25, 2013Assignee: Fulltone Musical Products, Inc.Inventor: Michael Fuller
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Patent number: 8378204Abstract: A pedal device for an electronic keyboard apparatus adds sound effects to musical notes generated by the electronic keyboard apparatus in response to an operator depressing the pedal device. A first reaction force application device is configured to apply a first reaction force countering a depression of the pedal by the operator from an initial state to a specified state to produce a first reaction force, wherein the first reaction force increases as the pedal is depressed from the initial state to the specified state. A second reaction force application device that is configured to apply a second reaction force countering a depression of the pedal by the operator after the specified state, wherein after the specified state the first reaction force and the second reaction force are applied to the pedal.Type: GrantFiled: December 23, 2010Date of Patent: February 19, 2013Assignee: Roland CorporationInventor: Yoshihiko Arayama
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Patent number: 8338689Abstract: An electric instrument music control device is provided having at least two multi-axis position sensors. One sensor is a reference multi-axis position sensor having at least one axis held in a fixed position. Another sensor is a moveable multi-axis position sensor rotatable about at least one axis corresponding to the at least one axis of the reference multi-axis position sensor. The electric music control device also includes a processor in communication with both the reference multi-axis position sensor and the moveable multi-axis position sensor. The processor calculates an angular difference in response to receiving the angular position of the at least one axis of the reference multi-axis position sensor and the angular position of the at least one axis of the moveable multi-axis position sensor. The angular difference correlates to a music effect of an electric instrument.Type: GrantFiled: August 25, 2010Date of Patent: December 25, 2012Assignee: Telonics Pro Audio LLCInventor: David W. Beaty
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Patent number: 8084681Abstract: A combination distortion pedal and amplifier includes a foot pedal controls the distortion and the amplification of audio signals. The level of distortion and amplification are determined by the position of the foot pedal with a low level of distortion and amplification when the foot pedal is in a released position and a high level of distortion and amplification when the foot pedal is depressed. Various intermediate distortion and amplification levels are provided when the foot pedal is in positions between fully released and fully depressed.Type: GrantFiled: June 1, 2010Date of Patent: December 27, 2011Inventor: Neal Schon
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Patent number: 7880078Abstract: Respective sets of black keys and white keys of respective octaves of a keyboard 10 are defined as specific key range, respectively, to assign various tone colors of percussion instruments of a drum set to a plurality of keys included in the respective specific key ranges of the octaves. A specific key range has secondary key ranges to assign tone colors produced by different playing techniques of the same musical instrument. A depression of any key of a specific key range results in generation of a musical tone having a tone color of a percussion instrument assigned to the specific key range. To a pedal unit 20, a tone color of “bass drum” is assigned. Tone colors of “hi-hat” assigned to the keyboard 10 are controlled such that a depression of any key to which “hi-hat” is assigned with or without operation of the pedal unit 20 results in generation of a musical tone of open hi-hat or closed hi-hat.Type: GrantFiled: September 20, 2007Date of Patent: February 1, 2011Assignee: Yamaha CorporationInventor: Kenichi Nishida
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Patent number: 7732691Abstract: Improved methods and apparatus of producing vibrato on keyboard percussion/tone bar instruments such as the vibraphone and marimba are provided. Means are disclosed for real time control of the expressive qualities of both the speed and strength of the vibrato of such instruments, while eliminating the need for an electrical motor. According to certain embodiments, methods and apparatus are disclosed to easily produce a change of dynamic level (crescendo and diminuendo) after a single strike of a tone bar or chord.Type: GrantFiled: June 25, 2007Date of Patent: June 8, 2010Inventors: Leigh H. Stevens, Josef Eberl, Roger Clerc
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Patent number: 7709726Abstract: A foot controlled effects knob controls a variable electronic component. A receptacle couples with a spindle of the variable electronic component. One or more wings extend from the receptacle to facilitate control of the spindle, and thus the variable electronic component, by a user's foot.Type: GrantFiled: November 13, 2007Date of Patent: May 4, 2010Inventor: Chad C. Smith
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Patent number: 7608776Abstract: The invention allows for easy field-customization of floor controllers using techniques that are similar to those applicable to the easy creation of aggregated instruments. The invention further facilitates entirely new manufacturing, marketing, and sales paradigms permitting a broad range of open industry development and commerce, thus making an individual musician's creation of new floor controller arrangements an economically viable sector for both mass manufacturing and the niche cottage industry. New opportunities are provided for the creation of multiple-vendor standardizations, multiple-vendor manufacturing, multiple-vendor competitive features, etc. while offering the music equipment user and music industry as a whole, access to an extensive range of customization and diversification. The principles of the invention thus create a rich environment for floor controllers, their users, their features, their application, and the floor controller market.Type: GrantFiled: December 15, 2003Date of Patent: October 27, 2009Inventor: Lester F. Ludwig
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Publication number: 20080173164Abstract: A circuit for an electric guitar utilizes a transformer and balanced amplifier to facilitate the production of a variety of sound adjustment circuits.Type: ApplicationFiled: January 18, 2007Publication date: July 24, 2008Inventors: Otis M. Francis, Bradley D. Tluczek
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Patent number: 6965070Abstract: An upright keyboard instrument comprises a prescribed number of keys that are interlocked with actions, hammer assemblies, and a plate spring unit, which is interlocked with a loud pedal. When the key is depressed, the action is activated to drive the hammer assembly, thus producing a musical tone. Each of plate springs is normally arranged close to an end portion of a whippen included in the action. Upon depression of the key, the end portion of the whippen comes in contact with the plate spring to cause a resistive force, which is transmitted back to a player's finger depressing the key. When the loud pedal is depressed, the plate spring departs from the end portion of the whippen, which becomes free to rotate upon depression of the key, thus realizing loudness effect on sound.Type: GrantFiled: March 20, 2003Date of Patent: November 15, 2005Assignee: Yamaha CorporationInventor: Pu Wenjun
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Patent number: 6777606Abstract: In an electronic musical instrument, a key operation detecting section detects a key operation on a keyboard, and the hand key operation contains a key pushing operation and a key releasing operation. A control unit detects a chord of a chord part in response to the key pushing operation and the key releasing operation. Then, the control unit generates chord control data for a re-trigger operation based on the detected chord of the chord part, when the key operation is the key pushing operation. A sound generating section generates a new accompaniment sound based on the chord control data and automatic accompaniment data stored in a memory section in the re-trigger operation.Type: GrantFiled: October 29, 2002Date of Patent: August 17, 2004Assignee: Kabushiki Kaisha Kawai Gakki SeisakushoInventor: Yoshifumi Kira
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Patent number: 6762357Abstract: Resonance is realized at a desired plurality of tone pitches even after the musical tone signals of a plurality of channels have been synthesized; synthesized musical tone signals are successively delayed, the musical tone signals that are successively delayed are weighted, synthesized and output; the delayed, weighted, synthesized and outputted musical tone signals are fed back, and a series of successive delays, weights, synthesizes and outputs by the feed back are repeated and thus resonance characteristics is imparted; the amount of weighting the musical tone signals successively delayed is determined based upon a relationship among the delay feedback period, the period of sampling the generated musical tone signals and the tone pitch period of the resonance sound imparted with resonance characteristics, and a frequency of the resonance characteristics are determined; Therefore, the resonance characteristics are added at a desired tone pitch after the plurality of musical tone signals are synthesized intoType: GrantFiled: April 17, 2002Date of Patent: July 13, 2004Assignee: Kawai Musical Instruments Mfg. Co., Ltd.Inventors: Yutaka Washiyama, Seiji Okamoto
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Patent number: 6689947Abstract: A floor controller for real-time control of signal processors, synthesizers, musical instruments, MIDI processors, lighting, video, and special effects in performance, recording, and composition enviroments. Various combinations of physical controllers may be utilized (including foot switches, rocking foot pedals, null/contact touch-pads, pressure sensor arrays, etc.), as well as visual displays and internal control processing. Each physical controller may include a separate visual display of assigned name, status, and/or value. Rocking foot pedals may be used to simultaneously control multiple parameters by inclusion of aditional sensors. Each physical controller may be assigned specific control message functions, values, names, temporal event sequences, and invocation rules dicated by assignable state-machines. Assignments may be selected from organized structures via the physical controller elements.Type: GrantFiled: March 19, 2001Date of Patent: February 10, 2004Inventor: Lester Frank Ludwig
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Patent number: 6605769Abstract: A portable device is used for recording, editing, and replaying musical sounds generated by a musical instrument external to the device. The musical sounds are converted from analog to digital format, compressed for minimum storage usage, and stored in a digital storage medium. The stored signals are filed according to an indexing scheme that allows selection and retrieval of selected portions of the musical sounds. The selected portions are retrieved from storage, decompressed, converted back to analog signals, and output to a sound generating device. The operation of the device is controlled by application software and operating system software.Type: GrantFiled: October 5, 2001Date of Patent: August 12, 2003Assignee: Gibson Guitar Corp.Inventor: Henry E. Juszkiewicz
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Patent number: 6380475Abstract: A chord detection apparatus for an electronic musical instrument has a hand keyboard for hand operation, a foot keyboard for foot operation, a hand-keyboard detection unit for detecting a temporary hand-keyboard chord root and a temporary hand-keyboard chord type in accordance with operation of the hand keyboard, a foot-keyboard detection unit for detecting a temporary foot-keyboard bass root in accordance with operation of the foot keyboard, and a determination unit for determining a true chord root and a true chord type, and the presence/absence of a bass root in accordance with the temporary hand-keyboard chord root, the temporary hand-keyboard chord type, and the temporary foot-keyboard bass root.Type: GrantFiled: August 23, 2001Date of Patent: April 30, 2002Assignee: Kabushiki Kaisha Kawi Gakki SeisakushoInventor: Yoshifumi Kira
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Patent number: 6201173Abstract: An arrangement for enabling facile and efficient operation of at least one bass drum mallet, in combination with at least one bass drum, such that the bass drum with its associated mallet can be placed in any desired location, within and beyond, a limited Critical Performance Area which is encountered with conventional drumming equipment, and such that the mallet is operable by means of at least one foot pedal, placed close to, or remote from, the location of the mallet/bass drum assembly. The arrangement offers considerable flexibility in the location of bass drums and other drum/musical instruments, and equipment, and can be operated by means of wire, wireless, or direct mechanical, communication between the foot pedal and the bass drum mallet.Type: GrantFiled: June 15, 1998Date of Patent: March 13, 2001Inventor: Jet Black
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Patent number: 5981862Abstract: A guitar effects pedal system is provided including a base and a pair of ports mounted on the base for receiving an input cord to a guitar and an output core to an amplifier, respectively. An actuation pedal is situated on the pedal for actuating the system. Next provided is a control mechanism mounted on a top of the base for being easily manipulated by a foot of a user for altering a guitar signal passing from the input cord to the output cord.Type: GrantFiled: March 25, 1999Date of Patent: November 9, 1999Inventor: William H. Geier, Jr.
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Patent number: 5886279Abstract: A switch mechanism of a piano with a built-in electronic musical instrument, which eliminates the disposition of switches on the surface of a piano to improve the appearance of the piano. An upright piano(1) includes a hammering mechanism(7) which strikes strings in accordance with the operation of a keyboard(3), and thus it serves as an acoustic piano as well as an electronic piano because it has a built-in electronic sound source(9) controlled by the operation of the same keyboard(3). This upright piano(1) includes an inhibition mechanism(13) for inactivating the hammering mechanism(7) in electronic mode, a pedal mechanism(17) having a muffler pedal(16), a control portion(19) driven by a power supply(18) for controlling the electronic sound source in accordance with the operation of the keyboard(3) to produce sounds, and a power supply switch(21) turned ON/OFF by the actuation of the muffler pedal(16) to make and break the electrical connection between the power supply(18) and the control portion(19).Type: GrantFiled: May 13, 1997Date of Patent: March 23, 1999Assignee: Kabushiki Kaisha Kawai Gakki SeisakushoInventor: Tatsuya Inaba
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Patent number: 5803835Abstract: A game kit including a pliable hop scotch mat, an electrical actuated sound producing component and a plurality of individual electrical switches disposed between layers of the mat and adapted to be individually closed by pressure from a game participant when stepping on each of the designated areas on the game mat. The individual switches are positioned on each of the designated step or hop locations on the game mat. A battery power supply and speaker(s) are provided in a control unit housing the sound producing component and are in electrical connection with circuity leading from each of the individual pressure switches. The produced sound may be ringing of a bell, an individual music note, or a sequence of notes collectively playing a musical tune.Type: GrantFiled: December 9, 1996Date of Patent: September 8, 1998Inventors: James M. Moton, Shelia H. Moton, Gia T. Moton
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Patent number: 5741995Abstract: In order to give piano-like key touch to a player in an electronically sound producing mode, a keyboard incorporated in a musical instrument is linked with key action mechanisms associated with hammer mechanisms, and a stopper blocks the hammer shanks before the hammers strike the strings so that noises are not mixed with synthesized tones.Type: GrantFiled: January 11, 1996Date of Patent: April 21, 1998Assignee: Yamaha CorporationInventors: Kiyoshi Kawamura, Shinya Koseki, Nobuo Sugiyama, Masahiro Wada
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Patent number: 5726374Abstract: A polyphonic electronic musical instrument is provided wherein a keyboard is used to trigger arpeggiated chords which emulate a strumming guitar sound. Select keys are provided for selecting which notes are included in chords to be strummed. At least one triggering device is also provided for triggering chords. The triggering device is constructed to alternate between two trigger states. The triggering device may be a keyboard key, foot pedal, or other device. The instrument operates in such a fashion that two arpeggiated chords of alternating direction (ascending and descending) may be produced during, and at least partially as a result of, one triggering device cycle from one state to the other and back again.Type: GrantFiled: November 21, 1995Date of Patent: March 10, 1998Inventor: Paul B. Vandervoort
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Patent number: 5659145Abstract: A foot-operated signal controlling pedal with a series of LED's integrated in the pedal housing to indicate signal level. The pedal may perform one or more of a variety of sound effect functions with any of the common circuits in use currently, with a parallel but separate circuit controlling the LED display. The invention is of the typical rocker pedal design with a linkage joining the foot pedal to variable resistors which control the LED's and the audio signal in a parallel and simultaneous fashion.Type: GrantFiled: April 27, 1995Date of Patent: August 19, 1997Inventor: Robert P. Weil
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Patent number: 5550321Abstract: A foot operated electronic musical instrument with a plurality of foot actuated pedals, which correspond to the notes produced by a bass guitar. Depressing a particular pedal causes an electronic tone generator to produce a corresponding note. Pedals are generally provided only for natural notes, with the exception of A# and D#. In order to obtain the full chromatic scale, a flat switch is included. When engaged by the foot this switch has the effect of lowering the value of the note by one half step, hence adding a flat, or a sharp with respect to the next lower note.Type: GrantFiled: December 9, 1994Date of Patent: August 27, 1996Inventor: William A. Brann
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Patent number: 5391830Abstract: A foot pedal control system incorporated in an electrical musical keyboard instrument is expected to decide an output signal of a foot control pedal unit to be either analog or digital signal on the basis of a series of discrete voltage levels through periodical sampling on the output signal, and a microcomputer system of the foot pedal control system executes a program sequence for periodically monitoring the discrete voltage level, deciding the digital signal to be either analog or digital signal and determining an instruction of a player represented by the output signal.Type: GrantFiled: May 25, 1993Date of Patent: February 21, 1995Assignee: Yamaha CorporationInventors: Toshihiro Nishino, Rei Furukawa, Takashi Tamaki
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Patent number: 5350883Abstract: An electronic piano with a pedal, which can control various parameters by the pedal. The electronic piano has a mode switch for selecting a mode, and the electoronic piano switches parameters to be controlled by the pedal according to the selected mode by the mode switch. The pedal can provide not one but a variety of parameter control functions. Further, an electronic piano with first and second pedals, wherein a relationship between the up/down operation of the first pedal and an increase/decrease in parameter to be controlled is set to be opposite to a relationship between the up/down operation of the second pedal and the increase/decrease in parameter to be controlled.Type: GrantFiled: July 16, 1992Date of Patent: September 27, 1994Assignee: Yamaha CorporationInventors: Minoru Kitamura, Makoto Iwabayashi
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Patent number: 5166467Abstract: A chord-generating synthesizer system including an electronic keyboard instrument and a remote control unit operable by a musician's foot--while the musician is using both hands to simultaneously play an instrument such as a guitar. The keyboard instrument is formed with circuit electronics for generating polyphonic music, and has internal wiring that provides a plurality of normally open circuit loops. Each circuit loop includes a pair of connector output terminals for closure of the loop. The circuit electronics is responsive to closure of the loops for generating a note or chord. The remote control unit is separate and external from the instrument, but is selectively connected to the instrument by a multi-lead cable; the unit includes multiple connector inputs and a plurality of switches. Each switch is wired between at least a pair of the connector inputs for remote control of the chord-generating function of the keyboard instrument.Type: GrantFiled: May 17, 1991Date of Patent: November 24, 1992Inventor: Tommy M. Brown
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Patent number: 5028776Abstract: A high hat cymbals device is automatically actuated to hold the cymbals locked in place. The presence or absence of the drummer's foot on or above the foot pedal for actuating the high hat is sensed, and the cymbals held together if the drummer's foot is not sensed. Sensing is accomplished utilizing an infrared LED or other source of light, preferably one that is pulsed and frequency modulated, and a photodiode or other light sensing device. The signal from the photodiode is filtered and amplified and ultimately operates a solenoid to either allow normal operation of the high hat, or move the high hat cymbals together. The light source and sensor are mounted on the bottom of the foot pedal and cooperate with an opening in the foot pedal so that the light is reflected to the photodiode if the drummer's foot is present on or above the foot pedal, but passes through the opening if it is not.Type: GrantFiled: May 21, 1990Date of Patent: July 2, 1991Assignee: Steven FortiInventors: Steven Forti, William B. Lee
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Patent number: 5022305Abstract: The distortion pedal for electric guitar and other electronic musical instruments employs vacuum tube circuitry operated by low voltage "battery eliminator" DC power supply. A pull-up resistor biasing circuit on the vacuum tube grid improves input and output impedance and circuit headroom while providing good control over the harmonic content and sustain.Type: GrantFiled: April 20, 1989Date of Patent: June 11, 1991Inventor: Brent K. Butler