Abstract: The position of a connecting portion between waveforms can be arbitrarily set when a plurality of waveform data is obtained by changing pitch widths of stored external sound waveform data, when a read rate of the waveform data is increased or decreased and the readout waveform data is synthesized, or when the waveform is changed from one waveform to another waveform. In addition, a plurality of loop reproduction cycles can be arbitrarily set when the waveform data is to be read out. In loop reproduction, two items of waveform data having different phases between the preset start and end addresses can be repeatedly read out and synthesized, and their mixing ratios can be changed as a function of time, thereby performing loop reproduction so as not to abruptly change amplitude values of the waveforms.

Abstract: A sound processing system comprises a waveform distributor for distributing an input sound waveform, offset devices for executing an offset process for each of the waveforms received from the waveform distribution device, and a multiplication and addition device for multiplying the offset waveforms by predetermined coefficients and then adding the multiplied waveforms. Since the distributed waveforms are offset by the independent offset devices, highly varied sound can be produced by changing the coefficients of the offset devices and the multiplication and addition device, and also by changing these coefficients as time elapses.

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: Disclosed are a method and apparatus for analyzing an input vocal signal to produce a plurality of harmony signals that are combined with the input vocal signal to produce a multivoice signal. The method makes a current estimate of the fundamental frequency of the input vocal signal and determines if the current estimate is the correct estimate of the fundamental frequency. If the current estimate is correct, a reference note is assigned to correspond to the current estimate and a plurality of harmony notes are selected to correspond to the reference note. The method then generates a plurality of harmony signals by scaling the input vocal signal with a piecewise linear approximation of a Hanning window to extract a portion of the input vocal signal and by replicating the extracted portion at a plurality of rates equal to the fundamental frequencies of each of the harmony notes. The plurality of harmony signals and the input vocal signal are combined to produce the multivoice signal.

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.

Abstract: There are disclosed an apparatus adapted to generate musical information of a synthetic sound in accordance with the MIDI (Musical Instrument Digital Interface) standard to carry out PCM (Pulse Code Modulation) recording of a natural effect sound including natural sound and/or a human voice such as back chorus to mix them to generate musical accompaniment, thus to mix a voice of singing sung with the musical accompaniment, and a recording medium used for such an apparatus.

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.

Abstract: The position of a connecting portion between waveforms can be arbitrarily set when a plurality of waveform data is obtained by changing pitch widths of stored external sound waveform data, when a read rate of the waveform data is increased or decreased and the readout waveform data is synthesized, or when the waveform is changed from one waveform to another waveform. In addition, a plurality of loop reproduction cycles can be arbitrarily set when the waveform data is to be read out. In loop reproduction, two items of waveform data having different phases between the preset start and end addresses can be repeatedly read out and synthesized, and their mixing ratios can be changed as a function of time, thereby performing loop reproduction so as not to abruptly change amplitude values of the waveforms.

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: In an image reproducing apparatus, a music information reproducing unit reproduces musical information, lyrics information or still picture information from a music information recording medium on which the musical information, the lyrics information or the still picture information relating to a plurality of music pieces are recorded, and an image information reproducing unit retrieves moving picture information in a predetermined order in correspondence with respective music pieces in the music information recording medium from an image information recording medium on which moving picture information divided into a plurality of moving picture information segments is recorded, and reproducing said picture information segments.

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: A music entertaining device which reproduces music instrumental sound and back chorus so that an entertainer can sing a song to the accompaniment of the reproduced music instrumental sound and the back chorus. The music instrumental data and back chorus data are separately stored in a memory device. Upon detection of a code instructing to insert back chorus during the reproduction of the music instrumental data, a computer base controller accesses the memory device in which the back chorus is stored and reproduces the back chorus identified by the code detected.

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).

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.

Abstract: Disclosed are a method and apparatus for analyzing an input vocal signal to produce a plurality of harmony signals that are combined with the input vocal signal to produce a multivoice signal. The method makes a current estimate of the fundamental frequency of the input vocal signal and determines if the current estimate is the correct estimate of the fundamental frequency. If the current estimate is correct, a reference note is assigned to correspond to the current estimate and a plurality of harmony notes are selected to correspond to the reference note. The method then generates a plurality of harmony signals by scaling the input vocal signal with a piecewise linear approximation of a Hanning window to extract a portion of the input vocal signal and by replicating the extracted portion at a plurality of rates equal to the fundamental frequencies of each of the harmony notes. The plurality of harmony signals and the input vocal signal are combined to produce the multivoice signal.

Abstract: A hardware and software system and method for a personal computer such as the Macintosh allows recording, editing, and playback of sound. The system includes a sound editor which displays sound waveforms, and permits the user to mix together several simultaneously displayed waveforms, and to change the pitch and amplitude of one part of each waveform by means of a novel screen display.

Abstract: In a musical accompaniment playing apparatus, a reproducing unit reproduces control information from a recording medium on which control information is recorded according to a MIDI standard, a sound source unit generates musical accompaniment information by the control information, a transducer transforms a singer's voice to voice information, a control unit controls a volume level of the musical accompaniment information according to the singer's ability, mixing unit mixes the musical accompaniment information with the voice information, and an output unit outputs the mixed information as sound.

Abstract: An electronic musical instrument having selectable monaural, stereo and multiple channel musical performance capability is disclosed which includes a performance data generating device; tone signal generating systems; sound producing systems; a mode indicating device; a selection device; and a distribution device. The tone signal generating systems generate musical tone signals based on performance data generated by the performance data generating device. The sound producing systems produce musical sounds based based on the musical tone signals. The selection device allocates performance data to a single musical tone signal generating system when the mode indicated by the mode indicating device is the first mode. The selection device allocates performance data to plural musical tone generating systems when the mode indicated by the mode indicating means is the second mode.

Abstract: A musical tone synthesizing apparatus simulating a wind instrument includes an excitation circuit simulating a reed operation of a mouth piece portion, a resonance circuit simulating a resonance tube and a musical tone control circuit. The excitation circuit produces an excitation signal based on an input signal and a reflected wave signal transmitted from the resonance circuit. The excitation signal is input to the resonance circuit. The resonance circuit includes a bi-directional transmission circuit and a junction unit which is inserted into the bi-directional transmission circuit. The junction unit caries out a scattering operation corresponding to a scattering operation of compression wave of air which is occurred in the vicinity of the tone hole of the resonance tube. The excitation signal propagates through the bi-directional transmission circuit in a forward direction as a progressive wave signal.

Abstract: A musical tone synthesizing apparatus synthesizes musical tones by simulating the tone generation construction of a plucked-string or struck-string instrument. The apparatus has a loop circuit which simulates a vibrating element of the instrument, an excitation circuit creates an excitation signal corresponding to the excitation given to the vibrating element in response to the operation of operators such as a pick or a hammer or the state of the generation body and a memory which stores a non-linear relation between the operator and the vibration element. The excitation signal circulates around the loop circuit and is delayed by means of a delay circuit with a previously determined delay interval, and is fed back into the excitation circuit as the state of the vibrating element.

Abstract: A performance apparatus for producing a mixed musical tone signal having a comparator and a modulator. The comparator detects key data corresponding to musical tones having the same pitch and the same or similar tone colors from key data of musical tones to be mixed. The modulator changes at least a tone element of the mixed musical tone signal on the basis of the key data detected by the comparator to produce tones having multiple-tone like tone colors. The modulator comprises a detuner for detuning pitches of some musical tones of a plurality of musical tones formed based on the key data detected by the comparator, or comprises a modulator for modulating an amplitude or a frequency of the musical tone signal formed and mixed bases on the key data detected by the comparator.

Abstract: An electrical musical instrument includes a scale designator for sequentially and automatically designating a scale on the basis of prestored data of a music piece, and a musical tone signal generator for outputting a musical tone signal including a harmonic frequency on the basis of the scale designated by said scale designator or as a fundamental frequency. A voice detector detects an external voice and the detected voice is divided by a modulator into voice signals in a plurality of frequency ranges. The musical tone signal is modulated in units of corresponding frequency ranges on the basis of the voice signals divided into the plurality of frequency ranges.

Abstract: An electronic musical instrument having a pan control function includes a pan device for deciding a synthesizing rate of the plural wave form elements in each of the musical tone output terminals independently. Static pan control fixes an image position of a musical tone, and dynamic pan control changes the image position with lapse of time. The dynamic pan control also includes EG pan control which changes the image position on a pre-stored orbit and bias pan control which changes the image position based on specified data during playing. In addition to an operator, such as a jog dial and a modulation wheel, key touch data or key number data can be used for the bias pan control. This musical instrument can synthesize a musical tone signal by combining the pan control functions to each wave form element, thereby forming very widened musical tones.

Abstract: A vibration of a string is picked up by a pickup to be converted to an electric signal. A pitch extracting circuit obtains pitch data expressing a pitch or a duration of the string vibration from the electric signal. A musical tone generating circuit generates a musical tone having a corresponding tone pitch in accordance with the pitch data. An envelope extracting circuit extracts an envelope from the eletric signal detected by the pickup and supplies a signal expressing the envelope to a multiplier. The extracted envelope signal is multiplied to the musical tone signal by a multiplier after a predetermined timing has been past. In other case, the extracted envelope signal is mixed with a synthe-envelope signal at a desired ratio, thereafter the mixed envelope signal is imparted to the musical tone signal by multiplying processing.

Abstract: A music reproducing method and apparatus for mixing voices input from a microphone and music data displays various information which represents that a musical performance of a piece of music is entering an interlude inserted between singing -portions, i.e., choruses, or is entering a postlude after the choruses are terminated, the information being provided by a screen display or speaker output of the music reproducing apparatus. The information can inform the user of the end of a song when the musical performance enters the postlude, and can inform the user of the end of singing-portions in the song when the musical performance enters the interlude. The information can be related to the music or the like known to the user.

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 position of a connecting portion between waveforms can be arbitrarily set when a plurality of waveform data is obtained by changing pitch widths of stored external sound waveform data, when a read rate of the waveform data is increased or decreased and the readout waveform data is synthesized, or when the waveform is changed from one waveform to another waveform. In addition, a plurality of loop reproduction cycles can be arbitrarily set when the waveform data is to be read out. In loop reproduction, two items of waveform data having different phases between the preset start and end addresses can be repeatedly read out and synthesized, and their mixing ratios can be changed as a function of time, thereby performing loop reproduction so as not to abruptly change amplitude values of the waveforms.

Abstract: An electronic musical instrument having a key-depression-detecting circuit for detecting a depressed key on a keyboard and for generating tone-pitch data corresponding to the depressed key, a tone-color-designating circuit for sequentially designating a desired tone color among a plurality of tone colors, a tone-color-data-storing circuit for storing tone-color data associated with the tone colors sequentially designated by the tone-color-designating circuit, an ensemble-tone-designating circuit for designating a predetermined number of tone colors among the most recently designated tone-color data stored in the tone-color-data-storing circuit; and a musical-tone-signal-generating circuit for generating a plurality of musical-tone signals in a parallel fashion, each of the musical-tone signals having a tone color corresponding to one of the tone colors designated by the ensemble-tone-designating circuit, and having a tone-pitch corresponding to the tone-pitch data generated by the key-depression-detecting cir

Abstract: An electronic tone generator in which a plurality of types of scale data and tone-length data are stored in an associative arrangement at predetermined addresses in a single storage device. The plurality of types of scale data read from the single storage device are input to corresponding waveform generators, where melody-waveform signals are generated. The melody-waveform signals generated in the respective waveform generators are mixed and synthesized by a mixer before being output from an output device. The waveform generators are adapted to switch envelope waveforms generated by envelope-waveform generators of a digital circuit configuration with waveform signals corresponding to the scale data, thereby obtaining melody-waveform signals.

Abstract: A plurality of waveforms are time-divisionally obtained from a waveform generator in one sampling period under the control of a controller. The sampling period is equally divided into a plurality of module periods. Each module period is also divided to correspond to the number of waves which are obtained time-divisionally. The waveform generator includes a selector which uses waveform data produced in a preceding module in the sampling period as that for waveform generation in the following module.

Abstract: A musical sound analyzer and synthesizer uses a model that considers a sound to be composed of two types of elements: a deterministic component plus a stochastic component. The deterministic component is represented as a series of sinusoids, with an amplitude and a frequency function for each sinusoid. The stochastic component is represented as a series of magnitude spectral envelopes. From this representation, sounds can be synthesized that, in the absence of modifications, can behave as perceptual identities, that is, they are perceptually equal to the original sound. In addition, stored representations of sounds can be easily modified in a musical synthesizer to create a wide variety of new sounds.

Abstract: A tone generation control unit has four waveform read/write channels for selectively the reading or writing data in a waveform memory. A plurality of waveform signals stored in the waveform memory are converted into analog signals to be subjected to timbre and tone volume control through voltage-controlled filters and voltage-controlled amplifiers before being fed to a mixing adder. An output signal of the mixing adder is converted into a digital signal which is stored in the waveform memory again through processing of the tone generation control unit. The stored converted output from the mixing adder is later used again as a new sound source waveform which is operated on to produce tones.

Abstract: Initial touch data or after touch data is obtained by operating a play input unit, such as keys or strings. A musical tone whose timbre or volume changes by the touch data is obtained. A tone generator has a plurality of sound source lines. Desired waveform data is selected by the touch data for each line. Only one type of the selected waveform data that is segmented at a touch split point is outputted for each line. The musical tone may be detuned by finely staggering the reference frequency, for each line. An envelope waveform may be applied to the musical tone for each line.

Abstract: An eigenvector synthesizer is provided for producing a wide range of musical sounds using a subset of eigenvectors of related sounds. The waveshapes of the eigenvectors can be scaled and summed to provide an accurate reproduction of the related sounds. With an astute selection of related sounds, an accurate reproduction of a wide range of musical sounds can be provided with a minimum amount of memory and a minimum number of calculations.

Abstract: A music synthesizer is constructed according to a modular scheme with plural, substantially interchangeable voice units. During operation, these voice units are used to simulate different instruments. The voice units operate under control of a master computer, and take waveform data from a common memory through a common digital data bus. The actions of each voice unit in simulating a note are controlled according to a plurality of control parameters. These control parameters are derived by interpolating between plots of each control parameter versus time for a weak actuation (soft note) and a strong actuation (hard note) condition. The synthesizer is arranged to simulate the effects caused by the interactions between closely spaced excitations of the same instrument such as closely spaced strikes upon a drumhead, by varying the qualities of the sound. The synthesizer may also serve as a mixer or as a multichannel signal processing device.

Abstract: A method of scaling a harmonic coefficient is employed, and envelope smaller in number than the number of harmonic orders are produced. One of the envelope is selected for each harmonic order and output as a scaling value. This enables the production of a musical tone imitative of a desired one, decreases the number of envelope generators needed, and permits simplification of the entire system configuration and signal processing.

Abstract: A digital electronic musical instrument for synthesizing a musical waveform by computing high harmonics. The musical instrument includes a musical waveform generator, an overflow detection circuit and a data selection circuit. A musical waveform is preferably added at an adder which outputs an added musical waveform. This output added musical waveform is checked to determine if an overflow condition occurs. A data selection circuit receives the added musical waveform and establishes level limited data and non level limited data. The data selection circuit selects the level limited data upon occurrence of an overflow condition and selects non level limited data when no overflow condition exists.

Abstract: An apparatus for achieving the effect of air movement in instruments during replication and sounding of complex musical instruments by separating unstable frequency components, the quasi-periodic components, from stable fundamental and harmonic components, the periodic components, of compound voice waveforms, storing the respective component information pertaining to the quasi-periodic and periodic components in separate memory locations, and recombining the quasi-periodic component with one or more periodic components in appropriate fashion to form and sound the compound voice waveforms.

Abstract: An electronic music and sound mixing device, to be combined with a doll or a toy animal. The device comprising a mix ROM and a speech ROM for storing digital data of melodies, accompaniments and animal voices, a logical control circuit for controlling the operation of this device responsive to external signals to play a single song or all of the stored songs, once or continuously. The devices further include melody and accompaniment generators for treating the digital data read from the mix ROM and couples their output to a mix circuit which mixes the signals and shapes them into square waves for coupling to an amplifier for generating an audio output. The device can also output synchronized signals simultaneously to drive a motor to give facial expressions and limb movements to the toy animal in accordance with the song played.

Abstract: A waveshape memory stores a full waveshape of a tone from the start to the end of sounding of the tone or a portion thereof in plural periods. A tone wave signal produced by reading this waveshape memory is applied to a tone color circuit where its tone color is changed. The tone wave signal whose tone color has been changed and the tone wave signal whose tone color has not been changed are both multiplied with respective coefficients whereby these tone wave signals are weighted. The weighted tone wave signals are added together to provide a mixed tone signal. By controlling the coefficients, the tone color imparted on the mixed signal is variously determined. The coefficients for the tone color control are provided in accordance with key scaling, key touch or operation states of control knobs. Thus tone signals exhibiting a variety of tone color changes are obtained using not so many wave memories.

Abstract: In an apparatus for generating sound, there are provided a plurality of channels for generating sounds. Each of the channels includes a memory for storing waveform data, and at least one of the channels includes a noise generator so that various kinds of sounds including rhythm sound-effects sound, effects sound-vibrato etc. are generated. There is further provided a controller by which voice sound signal is passed through the channels so that artificial sound, voice sound etc. are generated. There is still further provided a circuit for adjusting an amplitude level of a whole sound which is obtained by mixing output sounds of the channels so that far and near sound is produced. Further, each of the channels includes left and right attenuators which divide a channel sound into left and right channel sounds.

Abstract: A parameter generation circuit sequentially generates different tone forming parameters by timewise changing them in a predetermined sequence. A sequence control circuit performs a control so as to repeat the sequential generation of the different tone forming parameters in the parameter generation circuit. The sequentially generated tone forming parameters are applied to a tone forming circuit in which a tone signal having tone color characteristics based on these tone forming parameters is formed. The tone color characteristics of the tone signal formed undergo timewise change due to the timewise change in the tone forming parameters. By repeating the sequential generation sequence of the tone forming parameters, an adequate tone color variation can be realized notwithstanding that a relatively small number of tone forming parameters may be used.

Abstract: Combinations of operation data such as timbre data, effect data, and the like, which are designated for a musical performance, are stored in a memory. The operation data is read out from the memory, and a musical tone signal corresponding to the readout operation data is generated and a musical tone is produced. Operation data is an operation mode can be transferred to, e.g., a normal mode, and a musical tone signal corresponding to the readout operation data can be generated and a musical tone can be produced in the normal mode. Operation data set in the normal mode can also be transferred to the operation mode. Part of the combined operation data can be easily updated.

Abstract: There are provided first and second tone signal generation channels for respectively generating tone signals having waveshape characteristics corresponding to parameters assigned thereto. Tone color change control information such as key touch data is applied to a parameter assigning circuit. The parameter assigning circuit selects two parameters from among three or more parameters which are different from one another and assigns the selected two parameters to the first and second tone signal generation channels respectively. Tone signals having different characteristics, which are determined by the assigned parameters, are generated from the respective channels. The tone color change control information is further applied to an interpolation circuit connected to the first and second channels. The interpolation circuit interpolates the generated tone signals in accordance with the tone color change control information. A result of the interpolation is outputted as a tone signal for a tone to be produced.

Abstract: An electronic musical instrument includes a plurality of address generators for producing address signals corresponding to different tones each varying at a rate synchronous with the frequency of each of the different tones, a waveform memory device including a plurality of addresses for storing at respective addresses a plurality of waveform sample values that constitute a waveform, a circuit for sequentially supplying one after another of the address signals to the waveform memory device to read out the waveform in different rates in a time division multiplexed manner for different tones, and musical tone forming circuits for forming musical tones in accordance with the time division multiplexed waveform outputs of the waveform memory device.