Abstract: A moment at which each of a plurality of pieces of sound data is generated in response to one sounding operation is controlled, and the plurality of pieces of sound data are output to different sounding units. Consequently, differences occur among moments at which sounds are radiated by the sounding units, resulting in an occurrence of differences among lengths of time taken by the sounds to reach the ears of a listener, whereby a stereophonic sound can be produced and the listener can localize a sound image.

Abstract: An echo generating apparatus includes an echo effect generator for producing reverberative echo effect by delaying an input audio signal; a band limit filter for limiting the frequency band of the output signal of the echo effect generator; a first calculator for delivering an output signal by calculating the input audio signal and the output signal of the band limit filter; and a frequency characteristic compensator for emphasizing the signal of the frequency band attenuated by the band limit filters. The echo effect generator consists of a second calculator for calculating the input audio signal and the output signal of the band limit filter, an analog delay means for delaying the output signal of the second calculator, and a clock generator for generating an operation clock signal for the analog delay means. A long reverberative echo time is maintained without the necessity of increasing the number of signal delay stages or enlarging the scale thereof.

Abstract: A positional effect sound generation apparatus for an electronic musical instrument includes a function selector for selecting a function according to a user's selection, a note sensing circuit for sensing a note corresponding to a key on a keyboard pushed by a performer, a storage unit for storing a plurality of control signals, a CPU for selecting ones of the control signals in the storage unit corresponding to the selected function and the sensed note, a ROM for storing a plurality of sound data, a sound generator for selecting a desired one of the sound data in the ROM in response to the control signal from the CPU and generating a sound signal according to the selected sound data, a sound processing circuit for processing the sound signal from the sound generator and generating an analog echo effect sound signal, a mixer for mixing the processed sound signal with the analog echo effect sound signal, a display controller for controlling a display unit in response to the control signal from the CPU to disp

Abstract: A sound effect-creating device amplitude-modulates a monaural original sound signal obtained from stereophonic sound signals, delays the resulting modulated signal by delay amounts different from each other, selects and adds up a combination of a plurality of delayed modulated signals to form signals to be added to the stereophonic sound signals, and outputs the resulting stereophonic sound signals.

Abstract: A sound echo machine as an acoustic signal processing unit of the present invention comprising an adder to which an input signal is fed, and a delay circuit for delaying the signal fed from the adder for a certain time to repeatedly feed back to the adder to generate an echo sound further comprises an input signal level detector for detecting the level of the input signal and sending it to a frequency oscillator to vary the oscillating frequency in accordance with the thus detected signal level for feeding it later to the delay circuit so as to modulate the time to be delayed at a predetermined cycle, whereby it can create an acoustic field in which a listener can feel as if various level of reflected sounds are coming towards him from various directions.

Abstract: A sound effect-creating device for imparting a sound effect to a musical tone produced by performance subjects an analog or digital signal indicative of the musical tone to reverberation processing over a predetermined reverberation time to add reverberations to the musical tone. The predetermined reverberation time is set based on a basic reverberation time determined in a manner dependent on the repetition period of a timing clock of a MIDI signal received from an external electronic musical instrument. Alternatively, the repetition period of a timing clock of a MIDI signal transmitted to an external electronic musical instrument is determined based on a reverberation time parameter used in setting the predetermined reverberation time.

Abstract: An electronic musical instrument capable of providing an optimum sound field localization, such as key scale panning, suitable for a tone color selected from a plurality of tone colors by a player. A panning data for dividing a tone signal into right and left tone signals is generated in accordance a selected tone color and tone pitch of a tone signal to be generated. The panning is executed by using the panning data.

Abstract: When a plurality of effects are simultaneously applied to an input audio signal, a plurality of effect-algorithms each for applying solely an effect to the input signal are stored in a memory, and a plurality of combination-algorithms or combination-data which represent combinations of the effects and orders in which effects are applied to the input audio signal are stored in the memory. When one of the combination-algorithms or the combination-data is selected, effect-algorithms included in the selected combination-algorithm or combination-data are selectively read out from the memory. A program for applying effects in a predetermined combination and order is written by CPU based on the read out effect-algorithms and combination-algorithm or combination-data. Receiving the program, DSP successively applies effects to the input audio signal in accordance with the program.

Abstract: An electronic musical instrument for realizing an easy selection of registration from a variety of registrations. First, a number from "1" to "10" is selected in an upper keyboard timbre select switch group, the numbers corresponding to various timbres, such as piano, organ, harpsichord, guitar, or the like respectively. Similarly, another number from "1" to "10" is selected in a rhythm selecting switch group, the numbers corresponding varies to rhythms, such as jazz, pops, mood music, children's songs, classical, or the like. According to this, a preferable registration group with respect to the music can be easily selected from a great number (i.e., 10.times.10=100) of registration groups.

Abstract: A digital signal processor in which the control device transmits to and writes into the buffer memory the data necessary for multiplication or for generating addresses in the external memory, and then the data in the buffer memory is written into the internal memory during a single sampling period. This processing device contains an address comparator that compares the address set by the control device in the internal memory into which the data in the buffer memory is written, with the address in the internal memory controlled by the program, and then that produces control signals to write the data read from the buffer memory into the internal memory. The data read from the buffer memory is written into the internal memory, and is also used for multiplication or for generating addresses in the external memory.

Abstract: A method of detecting localization of an acoustic image, in which an acoustic impulse is emitted from a sound source to a dummy of a human head, an acoustic sensor is provided to a portion of the dummy's ears, and the response waveform is received by the acoustic sensor. This enables the detection of what effects are derived from interruption, reflection, and the like of a tone due to the human head. The received response waveform is analyzed and parameters for an acoustic image localization system are obtained. The acoustic image localization system comprising a delay circuit, a filter and an amplification controller sets the parameters into the delay circuit, the filter and the amplification controller, so that the detected localization of an acoustic image is reproduced.

Abstract: An apparatus for forming musical tone signals includes a playing operator and a tone signal synthesizing section for simulating a natural musical instrument, wherein a part of the tone signal synthesizing section, that is a part selectable for tone synthesization with respect to a plurality of tones is provided as connectable from external, and wherein storage means for storing procedure and parameters for synthesizing a musical tone signal is further provided as connectable from external.

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.

Abstract: An electronic musical tone generating apparatus includes a tone pitch designating unit for generating pitch signal representing tone pitch, a tone generation instruction unit for generating start signal instructing tone generation, a musical tone signal generating unit for generating a pair of musical tone signals representing a pair of direct sounds and a plurality of musical tone signals each representing a reflect sound in accordance with the start signal, wherein there can be difference of tone volume between respective musical tone signals of the pair of musical tone signals, and differences of tone volume and tone generation timing between respective musical tone signals of the plurality of musical tone signals, a controlling unit for controlling the difference of tone volume and the difference of tone generation timing in accordance with the pitch signal of the tone pitch designating unit, and a converting unit for converting the musical tone signals to musical sound.

Abstract: An electronic sound processor creates reverberation effects using a simulated impulse function. The simulated impulse response is generated by combining frequency bands of white noise. The power of each band decays exponentially in time. The time constants are generated from the characteristics of a real or imaginary listening space. A reverberated sound signal is generated from an original sound signal by convolution of the original signal and the simulated impulse response. The method can adapted to generated stereophonic signals and to generate a forward and inverse reverb effect using only one set of multiplications.

Abstract: A musical tone waveform signal forming apparatus comprises a waveform signal transmission section, a musical tone control signal input section and a pitch control section. The waveform signal transmission section comprises a plurality of signal transmission units which are connected in cascade one by one and each of which comprises first and second signal lines respectively serving as forward and backward paths of a waveform signal and a node portion for feeding back an output from the first signal line to an input side of the second signal line. At least one of the first and second signal lines serves as a signal delay line.

Abstract: A musical tone waveform signal forming apparatus having a modulation function comprises a delay loop system including a delay circuit and a filter, a excitation signal input section, a control member and a filter characteristic control circuit. The excitation signal input to the delay loop system circulate therein, so that a musical tone signal is formed. The control member instructs modulation of a musical tone signal. The filter characteristic control circuit changes with time the characteristics of the filter in accordance with an output from the control member. So that pitch modulation accompanied with tone color modulation is effected.

Abstract: In order to simplify the input operations for the simulation of the non-electronic musical instrument such as the wind instrument, input values are visually displayed on a display screen of a display unit. Herein, by operating an input device such as a keyboard, a mouse, a light pen and the like, a tube shape, position and size of a tone hole of the wind instrument is visually drawn on the display screen in accordance with the predetermined plotting programs. In order to simplify calculations required for the computer simulation, the tube shape of the wind instrument, such as a conical shape, is divided into plural portions, each of which is simulated by another simple shape, such as a cylindrical shape. Then, parameters defining the simulated shape of each portion of the tube shape are generated in accordance with the predetermined algorithm, and these parameters are memorized in a memory.

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.

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.

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.

Abstract: A musical tone control apparatus includes a sound source having a delay feedback synthesis circuit for forming musical tone signal by performing arithmetic processing of musical tone control data on the basis of a nonlinear table, a coordinate designation device capable of designating an arbitrary position and outputting a coordinate position corresponding to the designated position, a coordinate display device for displaying the coordinate position outputted by the coordinate designation device, and a table forming unit for forming the nonlinear table on the basis of the coordinate position outputted by the coordinate designation device.

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.

Abstract: In a sound effect apparatus which processes audio signals, a volume controller controls the volume of sound and a preset volume is detected by a detector. A plurality of delay lines delay audio signals by different delay times. A plurality of level converters generate reverberation sounds by decreasing the level of the delayed audio signals. Generated reverberation sounds and the input audio signal are added. The values of the level to which signals are lowered in the level converters are changed equally in response to the detected volume. When the detected volume is smaller than a specified volume, the values of the level to which signals are lowered are equally decreased. When the detected volume is larger than a specified volume, the values of the level to which signals are lowered are equally increased.

Abstract: A musical tone generating device is capable of simulating various special playing techniques for a stringed instrument in which the harmonic spectrums of produced sound is enhanced, or otherwise altered. The device includes a delay circuit wherein an input signal thereto is delayed and output; a closed loop circuit comprising multiple feedback pathways to which the output of the delay circuit is supplied and processed therein, after which the processed signal is returned toward the delay circuit as an input signal; an excitation device in response to a predetermined control signal, generating an excitation signal and supplying it to the closed loop circuit, such that the excitation signal corresponds to an excitation vibration in the stringed instrument being simulated; and a control device wherein the predetermined control signal is generated and whereby the delay interval of the delay circuit and the processing carried out in the multiple feedback pathways are controlled.

Abstract: In controlling a sound source for an electronic musical instrument, an operation data of a performance operation member corresponding to musical tone control parameters of a musical instrument is corrected according to a tone generation region characteristic of the musical instrument. The corrected data is inputted to a sound source circuit of the electronic musical instrument thereby a musical tone approximating of the musical instrument is regularly generated.

Abstract: A sound field compensating apparatus is provided in which delay data produced by one of the delay means in a FIR filter, which is realized by the action of a DSP, is commonly used for producing a plurality of reflected sound data of corresponding channels. Accordingly, the maximum delay time of the delay data is lengthened without increasing the number of delay data retrieving actions per sampling period on the delay memory. Hence, an acceptable number of the reflected sound signals can be obtained for each channel.

Abstract: An acoustic signal processing apparatus comprising infinite impulse response type digital filters and phase control device. The filters receive an acoustic signal. Outputs from the filters are synthesized to generate an output signal. The phase control device controls the phase of the output signals so as to cause limit cycle noise components generated by the filters to cancel each other on synthesizing.

Abstract: A musical tone synthesizing apparatus generates musical tones by simulating the tone generation construction of a plucked-stringed instrument or string-striking type stringed instrument. The apparatus has a closed-loop circuit which simulate a tone generating element of the instrument, an excitation circuit which creates an excitation signal corresponding to the excitation given to the tone generating element in response to the time function. The time function is set in response to operational information of the tone generating operator. The excitation signal is supplied to the closed-loop circuit and circulates around closed-loop circuit and is delayed by a delay circuit having delay interval, and is fed back into the excitation circuit as the state of the tone generating element.

Abstract: A musical sound synthesizing apparatus which simulates a sound generating mechanism of a string instrument by using an electronic circuit comprises a driver for applying data, an adder, a delay unit for storing data temporarily, a low pass filter for processing data, and a word length designating unit for designating a word length (address width) of the delay unit. The adder, delay unit and low pass filter form a loop-shaped circuit, with their corresponding input ends and output ends connected with each other. The word length designating unit corrects a word length of the delay unit in accordance with a phase delay of the low pass filter or in accordance with the number of stages of the pipeline structure of the loop. In the case where a musical sound of the type generated by touching or hitting strings is synthesized, the driver reads at least two series of data stored beforehand and applies the read data to one of the inputs to the adder.

Abstract: A reflection sound compression apparatus extracts and compresses, most appropriately with a physical evaluation value, an impulse response of a hall, etc. which is obtained by calculation and actual experiments to reflection sounds in a number required by a sound field controller by using a learning identification method.

Abstract: A nonlinear function generation apparatus and a musical tone synthesis apparatus are disclosed.The nonlinear function generation apparatus comprises hysteresis and nonhysteresis function generators for generating hysteresis and nonhysteresis functions using an input signal as a variable respectively, and a multiplier for synthesizing the functions outputted from the generators.The musical tone synthesis apparatus comprises a closed loop including delay circuits, and the nonlinear function generation apparatus.

Abstract: A musical tone synthesizing apparatus is disclosed wherein an excitation signal corresponding to performance data is generated and supplied to a loop circuit. In the loop circuit, this excitation signal is delayed for at least a fixed time period and a repeatedly circulating muscial tone signal is generated. At the beginning of the generation of this musical tone signal, a initial signal with a frequency which corresponds to the pitch of the generated musical tone is supplied. As a result of this, in the loop circuit, resonant operation is carried out quickly in accordance with the initial signal.

Abstract: The musical tone synthesizing apparatus simulating the wind instrument synthesizes a musical tone signal to thereby generate a musical tone corresponding to the wind instrument tone. Herein, the musical tone synthesizing apparatus contains one or more stages each including a bi-directional transmission circuit and a junction. In each stage, the progressive wave signal is delayed by the predetermined delay time and transmitted to the junction. The junction multiplies the signal by first coefficient, whereby the result of multiplication is transmitted to the next stage. The junction also multiplies the progressive wave signal by second coefficient, whereby the result of multiplication is fed back to the prior stage. The first and second coefficients are changed over according to an operation of a tone hole to be provided in the wind instrument. Thus, the musical tone of the wind instrument can be simulated with simple circuit or software.

Abstract: An electroacoustic system for acoustic enhancement of a room that includes a sound source location. The electroacoustic system includes a microphone spaced from the sound source location, an array of loudspeakers arranged in at least four interleaved banks, each bank including at least one loudspeaker, and signal processing electronics connected between the microphone and the speaker banks that includes an input channel, circuitry connecting the microphone to the input channel, a plurality of output channels corresponding in number to the number of speaker banks, circuitry connecting each output channel to a corresponding speaker bank, and at least four statistically independent time-variant reverberation units responsive to input signals from the microphone for producing output signals on the output channels for driving the several banks of speakers.

Abstract: An audio signal data processing system includes first and second processing devices for processing audio signal data, the first and second processing device having input and output ports of at least two channels, and a control device for controlling the operation of the first and second processing device. The input audio signal data is supplied to the input port of one channel of each of the first and second processing devices, and output data from the output port of said one channel of said first processing device is supplied to the input port of the other channel of the second processing device, and output audio signl data are obtained at each output port of both channels of the second processing device. With this arrangement, one of the cascade processing and the parallel processing can be selectively performed without using a change-over switch provided outside the system.

Abstract: An apparatus for producing an improved sound field in an acoustic space. The apparatus comprises a signal source for producing a source signal. The source signal is applied to a loudspeaker for reproduction thereof. The source signal is also applied to a reverberation circuit. The reverberation circuit includes at least two reverberation signal generators which provide different predetermined time delays to the source signal for converting it to two reverberation signals. At least one phase inverter is connected to invert at least one of the two reverberation signals before the reverberation signals are reproduced.

Abstract: A sound field switcher inputs an output sound field signal from a sound field producer. The inputted sound field signal is delayed sequentially by plural delayers, after which they are multiplied by coefficients by plural multipliers, and the multiplied results are all added by an adder. Coefficients stored in an area of a memory indicated by a coefficient counter are read out and set to the plural multipliers. The sound field switcher carries out control of the timing for switching the sound field signal produced by the sound field producer and the timing for the coefficient counter to commence counting. Assuming the time required for switching the sound field to be N sampling periods, in case of carrying out a sound field switching from a sound field A to a sound field B, a sound field switching controller issues an order to the coefficient counter so as to count up one by one from 0 to N, and on each count the coefficients stored in an area of the coefficient memory is set to the multipliers.

Abstract: An audio signal data processing system comprises an input device sequentially supplying incoming audio signal data, a data memory control device writing and reading-out the audio signal data into and from a data memory, a delay memory control device sequentially reading-out the audio signal data from the data memory and storing the data into a delay memory and sequentially reading-out the audio signal data from the delay memory and writing the data into the data memory, an arithmetic device multiplying predetermined coefficient data by the audio signal data having been read-out by the delay memory control device and written into the data memory and summing up results of the multiplication.

Abstract: A reverberation circuit comprises an amplifier, attenuation circuit, a feedback component, and a delay circuit. The amplifier, delay circuit, and feedback component form a feedback loop. The amplifier amplifies an input signal supplied to an input terminal and outputs an amplified signal to the delay circuit. The output of the delay circuit is fed through a feedback component back to the amplifier. The feedback component controllably varies the feedback amount of the delayed signal to the amplifier in accordance with the desired depth of reverberation. An attenuation circuit is placed in the feedback loop, or before or after the feedback loop. The attenuation circuit selectively attenuates the level of specific frequency component of a signal passing therethrough whose frequency may be different depending on the depth of reverberation or feedback amount.

Abstract: An input waveform signal is converted in an A/D converter into a digital signal to be written in a waveform memory under control of a tone generation control unit. The written digital signal is read out from the waveform memory with a designated delay time. The input waveform signal and the digital signal read out from the waveform memory are converted in a D/A converter into analog signals which are fed through VCFs and VCAs so as to be sounded. Further, in the above arrangement the timbre and tone volume controls are done independently for the individual waveform read/write channels through VCFs 12a to 12d and VCAs 13a to 13d. Thus, it is possible to obtain a further effected sound.

Abstract: A variable delay circuit for delaying an input signal and being capable of changing length of this delay is provided and various modulation effects are imparted by this delay. When change in the delay length has been designated, a decay envelope is imparted to a delay output tone signal corresponding to the delay length before the change and then a rise envelope is imparted to a delay output signal corresponding to the delay length after the change. Generation of a click noise during the change in the delay length thereby is prevented. Alternatively, when the delay length is to be changed, a decay envelope is imparted to a delay output signal corresponding to the delay length before the change and, simultaneously, a rise envelope is imparted to a delay output tone signal corresponding to the delay length after the delay and the two signals are combined.

Abstract: Each time sampling clock CK is input, a controller controls respective circuits, and performs various arithmetic operations of data stored in tone color parameter memories, and time-divisionally performs sound effect addition and changing of tone color parameters.

Abstract: In a musical tone signal generating apparatus, first sampling data and second sampling data are multiplied together by a convolution operation, wherein first sampling data indicates instantaneous amplitude values of a musical tone waveform generated from a keyboard, for example. The second sampling data is obtained from an impulse response waveform signal indicative of a reverberation characteristic of room or an acoustic characteristic of amplifier or musical instrument such as a guitar or a piano. Or, the second sampling data can be obtained from a waveform signal indicative of animal sound, natural sound or the like. Then, the multiplication result of first and second sampling data is combined together into the musical tone waveform data, whereby a musical tone signal corresponding to this musical tone waveform data is generated.

Abstract: Disclosed is a signal processor formed using digital waveguide networks. The digital waveguide networks have signal scattering junctions. A junction connects two waveguide sections together or terminates a waveguide. The junctions are constructed from conventional digital components such as multipliers, adders, and delay elements. The signal processor of the present invention is typically used for digital reverberation and for synthesis of reed, string or other instruments.

Abstract: A tone signal applied from outside is sampled by a tone sampling device and the sampled waveshape data is written into a memory. During this writing operation and in parallel with the writing operation, a zero crossing point of the waveshape in terms of the sample data of the tone signal is detected. A final address detection circuit stores, each time a zero cross has been detected, a write address of the waveshape sample data with respect to the memory. Address data which is stored in the final address detection circuit when the writing of the waveshape sample data in the memory has been completed is detected as a final address of the sampled waveshape data. The waveshape data in the memory is read out either in a forward direction in a reverse direction using this final address as a start point or an end point and a tone signal corresponding to the sampled waveshape data is sounded. Such address constituting the start point or end point of reading, i.e.

Abstract: An audio signal processing apparatus for digitally processing input audio signals according to the contents of a program for creating a given sound field. A basic program for creating a specific sound field is read from a first memory. The contents of the basic program are modified as required. The modified program is assigned thereto information identifying the basic program. The modified program as well as the identification information is stored in a second memory. When the modified program is read from the second memory, the information identifying that program is displayed first. After a predetermined time, the information identifying the basic program on which the modified program is based is displayed, replacing the previously displayed identification information.

Abstract: An electronic tone generator includes a signal-generating oscillator, a memory circuit for storing tone and time data for each note to be produced and two note producing circuits, each including a first programmable counter electrically connected to the memory circuit and the signal-generating oscillator and for variably dividing signals outputted by the signal-generating oscillator in order to sequentially produce notes of predetermined frequencies and durations according to the data read from the memory circuit. The note outputs of the two note producing circuits are interrelated to produce a music effect.