Abstract: A multimedia console incorporating an alphanumeric keyboard, and a musical key-bed is described for generating multimedia work product conveniently when coupled with a digital personal computer or optionally as a stand alone music equipment. The musical key-bed is detachably coupled with a protective cover for providing ergonomic support when, said musical key-bed is not being used.

Abstract: An improved structure of a magnet coupled type white glass ball transmission, more particularly an improved music white glass ball structure, being a breakthrough in the prior art that can generate only a single transmission and has a turning axle going into the white glass ball, which may lead to water leakage and requires use of an anti-leakage ferrule. By utilizing magnet coupled type white glass ball transmission, a rotor inside the glass ball can cause a propeller to rotate without making a through hole, so that swirls can be generated in the glass ball to drive floating particles or tinsels therein, thus creating a very beautiful scene. The power generated by the magnetic field drives a speed reduction gear set which transmit it to a turning disk at a reduced speed so that an ornament on the turning disk can turn round and round. Hence, a double transmission structure without making a through hole in the glass ball can be achieved.

Abstract: An electronic musical instrument for reproducing chords in a fixed interval scale, know as Tru-Scale, without overtone collision. The instrument includes a memory for storing of frequency information corresponding to respective notes for producing tones using the Tru-Scale interval system. The inventive instrument reproduces single notes and chords in accordance with an interval system which eliminates dissonance, allows complete modulation, in all key signatures, and pure tone chords without altering the keyboard. The invention also contemplates the use of the Tru-Scale frequencies with all MIDI interface compatible instruments, in conjunction with a suitable tone generator, or through internal or external memory sources.

Abstract: An improved dual-tone electronic music generator provides a phase difference between a melody and a chord such that the melody codes converted from the melody and the chord codes converted from the chord can be stored into a memory in series. This arrangement can increase the memory usage efficiency, and can reduce both the chip size and the production cost.

Abstract: In a typical musical tone producing device of a full waveshape readout type, a full waveshape of a musical tone to be produced from the start to the end of sounding or a rise portion and a part of the waveshape following the rise portion of the musical tone is stored in a waveshape memory, and the musical tone is formed by reading out the waveshape from the waveform memory once, or reading out the rise portion once and thereafter reading out the partial waveshape repeatedly. A digital filter is introduced following the waveshape memory in this tone producing device. The filter characteristics are determined in accordance with a tone color change parameter such as the key touch or the tone pitch of the musical tone, thereby realizing a tone color change of the musical tone. Further, in order to realize timewise change of tone color of the musical tone, the circuit which has the tone color change parameter vary with time is proposed.

Abstract: An input waveform signal is converted into a digital peak value signal by an A/D converter, and the digital peak value signal is input to one input terminal A of a comparator. The other input terminal B of the comparator receives a preset digital peak value signal from a memory. These input signals are compared by the comparator. The content of the memory is reduced at a predetermined rate. If the comparator detects that the currently input waveform level is larger than the continuously reduced level of the memory, i.e., if A>B, a new waveform level is loaded in the memory. As a result, the output from the comparator is inverted. That is, condition A>B is changed into condition A<B. The timing of this change in condition serves as a peak timing of the input waveform signal.

Abstract: A tone control apparatus for use in an electronic musical instrument is responsive to an easily accessible switch such as a foot-lever switch to control conditions of muscial tone which include, for example, a tone pitch, a tone color, a tone volume and a tone effect. The tone control apparatus has a keyboard for designating a frequency of a musical tone to be generated and a musical tone generating circuit for generating a musical tone having a frequency designated by the keyboard. The tone control apparatus further has a memory for storing a plurality of groups of tone control data. Each time the foot-lever switch is operated by the performer, one of the tone control data group is read and supplied to the musical tone generating circuit to control the conditions of the generating musical tone. In a first mode, the plurality of tone control data groups are sequentially read in synchronization with the operations of the foot-lever switch.

Abstract: A coded card for use in a melody playing apparatus. The coded card has four quadrants, each quadrant having a different melody therein. A synchronization code is encoded down the center of the card between alternates ones of the quadrants. By alternately rotating and turning the card over, each of the four quadrants with different melodies and the synchronization code will appear at a same predetermined quadrant position. Therefore, when playing on the melody playing apparatus, each of the melodies can be decoded thereby.

Abstract: A tone generating apparatus comprises at least an address generator, a waveform memory and a sound system. The waveform memory provides a plurality of storing areas each of which stores word data of N bits. Amplitude data of M bits (where M denotes as N<M.ltoreq.1.5N) of two sampling points are pre-stored in these storing areas in order to raise the utility efficiency of the waveform memory. Then, the word data stored in each storing area are sequentially read out from the waveform memory in a predetermined order based on the addresses generated by the address generator, and the amplitude data of two sampling points are reproduced by use of three word data stored in three storing areas. As a result, the tone corresponding to the reproduced amplitude data is generated in the sound system.

Abstract: An electronic musical instrument has a memory capable of storing musical tone waveform data therein. A read circuit reads out the musical tone waveform data from the memory and supplies the readout data to a musical tone generator. The musical tone generator generates a musical tone signal in accordance with the input musical tone waveform data, and outputs the musical tone signal. A write circuit writes new data in the memory at a timing different from the timing at which the read circuit reads out the musical tone waveform data from the memory. The write circuit partially updates the musical tone waveform data stored in the memory, and stores data of a played sound in part of the memory.

Abstract: A parameter setting system for an electronic musical instrument has a predetermined number of panel switches to which desired parameters can be selectively assigned by the player. The system comprises a RAM having a parameter area in which a group of parameters determining characteristics of a tone are stored, the number of parameters being greater than the number of the panel switches. The RAM also has an identification-number area for storing identification numbers of those parameters which are assigned respectively to the panel switches. When a reassignment switch is depressed with an entry switch, the system is brought into a reassignment mode. In this condition, the player selects a desired one of the parameters using up and down switches for changing the identification number and a display unit for displaying the identification number.

Abstract: A musical tone signal generating apparatus generates a musical tone signal whose tone color can be changed independently of a pitch or a frequency of the musical tone signal. The musical tone signal generating apparatus comprises a shift register on which sampled data of a predetermined waveform are initially loaded. The sampled data in the shift register are shifted at a frequency corresponding to a rate of change of the tone color, and each sampled data shifted out of the shift register is subjected to a predetermined operation such as a multiplication by a predetermined coefficient and is fed back to the shift register. The sampled data in the stages of the shift register are selectively outputted by a selector controlled in accordance with selection control data formed based on the pitch of the musical tone so that the sampled data are outputted at a rate determined by the tone pitch. The musical tone signal is then formed based on the thus outputted sampled data.

Abstract: In a tone signal generation device, original waveshape amplitude data corresponding to a waveshape signal from an external source is stored in a first memory. Waveshape data is read out from this first memory and is properly modified by a tone processing circuit such as a filter or a modulation effect circuit. The modified waveshape data is reserved in a second memory. The waveshape data stored in the second memory is selectively transferred to the first memory. In this manner, the original waveshape data initially stored in the first memory can be freely modified and a tone can be produced with a high degree of freedom as in a music synthesizer.

Abstract: A waveshape memory stores waveshape data representing plural waveshapes each having plural periods. A reading sequence controller designates ones to be read out among said waveshape data from the waveshape memory and the readout order thereof. This order may either be a random order or a predetermined one. By performing the readout of the waveshape data, repetitive reading of the same waveshape data is basically avoided, and a periodical noise and monotonousness in the tone color which tend to arise from such repetitive reading are eliminated.

Abstract: An automatic accompaniment apparatus includes an accompaniment pattern generation unit for generating a plurality of accompaniment patterns which represent timing of generation of a plurality of accompaniment tones to be generated respectively. The accompaniment patterns correspond to accompaniment tones.

Abstract: A musical tone generating apparatus for an electronic musical instrument utilizing a data compression system is disclosed. This musical tone generating apparatus is basically constructed by a memory storing difference data and a data reproduction circuit. The difference data is in advance obtained by converting a musical tone signal to be reproduced to digital sample data, effecting a linear prediction operation on the digital sample data to produce prediction data and calculating the difference between the digital sample data and the prediction data. The stored difference data are sequentially read from the memory. In the data reproduction circuit, the musical tone signal is reproduced by effecting a reverse operation of the linear prediction operation on the read difference data.

Abstract: An electronic entertainment device which allows an untrained vocalist or instrumentalist to easily synthesize an instrumental lead, and optionally, one or more harmonies, simultaneous with the lead, playing along with predefined background musical sequences. While the background parts to a song are being played by the device, or any outside musical player, the user plays the melody, or "lead", by humming, singing, whistling, or operating any tone-producing device, such as a musical instrument, into the device. The device then identifies the pitch, compares it with a table of allowable pitches, as dictated by predefined data associated with the background music, chooses an appropriate output tone, and drives a music synthesizer to play the chosen instrument at the determined pitch, in accordance with the allowable pitches. The note which is produced by the device is one which sounds pleasing in the context of the musical background.

Abstract: An automatic performance apparatus including a memory, a readout means, a musical tone generator, high and low-speed dials and a rotary encoder. The memory stores musical performance in an event style representing the on/off of a key and identifying the key and relative time data representing time between event of said key and the immediately previous event in accordance with musical performance. The readout sequentially reads out the event data from the memory. The musical tone generator is arranged such that the pitch, generation timing and termination timing of the generated musical tone are controlled on the basis of the event data read out by the readout means. A combination of dials and rotary encoders manually designates a readout direction and a readout speed of the stored data. The readout includes a circuit for exchanging the on-data with the off-data (and vice versa) in the memory when the designated readout direction is opposite to the storage order.

Abstract: A knob for attachment to a removable lid of a container, the knob containing a selectively actuatable music module. The knob serves both a utilitarian function, as a means for removing a lid from a container, and an entertainment or advertising function, by playing a preprogrammed message. Either function may be utilized separately or in combination as the user selects.

Abstract: A tone generation control unit has four waveform read/write channels for selectively 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.

Abstract: An electronic musical instrument has a musical tone signal forming circuit, an automatic rhythm generator rhythm selection switches, and a registration memory. The switches are used to select one of a plurality of rhythms. The automatic rhythm generator automatically generates a percussion instrument sound corresponding to a selected rhythm. In the registration memory, musical tone data respectively suitable for selectable rhythms are stored in advance. The musical tone signal forming circuit generates a musical tone signal representing a musical tone and further modifies the musical tone signal in accordance with the musical tone data corresponding to the selected rhythm, whereby a musical tone suitable for the selected rhythm can be generated.

Abstract: In this electronic musical instrument a musical tone is generated by repetitively reading out a waveshape stored in a memory. Repetitive sets of phase information are produced, such phase information thus being a linear saw-tooth-like digital signal having a repetition period corresponding to the frequency of the generated musical tone. Phase distorting means modifies the shape of the phase information so as to distort said linear saw-tooth-like signal, without changing the repetition period thereof. The resultant altered phase information is used to access said memory so that during the supply of each of said repetitive sets, successive samples in different portions of said stored waveshape respectively are read out at different effective rates. Thus the waveshape samples read out from said memory will consitiute a musical tone having changed tone color but unchanged pitch.

Abstract: An automatic music player system having an ensemble playback mode of operation using a memory disk having recorded thereon a piece of music composed of at least two combined parts to be reproduced separately of each other, the parts being recorded in the form of at least two data subblocks, comprising a first sound generator to mechanically generate sounds when mechanically or electrically actuated, at least one second sound generator to electronically generate sounds when electronically actuated and a control unit connected to the first and second sound generators, wherein (1) one of the two or more data subblocks of the data read from the disk is discriminated from another, whereupon the discriminated one of the data subblocks is transmitted to the first sound generator and another data subblock transmitted to the second sound generator, and wherein (2) the transmission of data to the second sound generator is continuously delayed by a predetermined period of time from the transmission of data to first soun

Abstract: An electronic musical instrument comprises devices for inputting rhythm and melody play patterns. The rhythm and melody play patterns are stored in a pattern memory such that the rhythm and melody play patterns are in a timed relation to each other. The rhythm and melody play patterns are simultaneously read out from said pattern memory so that rhythm tones and melody tones are sounded according to the rhythm and melody play patterns.

Abstract: In a typical musical tone producing device of a full waveshape readout type, a full waveshape of a musical tone to be produced from the start to the end of sounding or a rise portion and a part of the waveshape following the rise portion of the musical tone is stored in a waveshape memory, and the musical tone is formed by reading out the waveshape from the waveform memory once, or reading out the rise portion once and thereafter reading out the partial waveshape repeatedly. A digital filter is introduced following the waveshape memory in this tone producing device. The filter characteristics is determined in accordance with a tone color change parameter such as the key touch or the tone pitch of the musical tone, thereby realizing a tone color change of the musical tone. Further, in order to realize timewise change of tone color of the musical tone, the circuit which has the tone color change parameter vary with time is proposed.

Abstract: A keyboard operated musical instrument is disclosed in which musical tones having a variable spectral content are produced from waveshape data values that read out from a stored set of waveshape data points. A second set of data values is computed at the same rate as the rate for sequentially reading out the stored set of data values. A data select means periodically selects a sequence of the read out waveshape data points followed by the selection of a sequence of points from the second set of data values. The selected data points are converted into audible musical tones. Provision is made for varying the shape of the second set of data values in a time dependent fashion as well as to vary the time for which each data set is selected.

Abstract: A note clock generation circuit generates note clock pulses in correspondence to a note name of a tone to be generated. An octave rate data generation circuit generates rate data in correspondence to the octave range to which the tone to be generated belongs. By performing addition or subtraction of the rate data at the timing of generation of the note clock pulses, an address signal is generated. A tone generator generates a tone waveshape in the form of amplitude sampled values in response to an integer section of this address signal. An interpolation circuit performs interpolation between adjacent amplitude sampled values thus generated in response to a decimal section of the address signal. The rate of change of the decimal section of the address signal is changed in accordance with the tone range so that a finer interpolation is made as the tone range becomes lower. By this arrangement, decrease in an effective sampling frequency in the lower tone range can be prevented.

Abstract: An improved waveform generator used in an electronic musical equipment for reproducing musical sounds stored therein, in which the waveform of each musical sound is stored in a memory as a sequence of amplitudes sampled at specific sampling points on the waveform and reproduced therefrom by interpolating arithmetically any point between these sampling points.

Abstract: A keyboard operated musical instrument is disclosed in which dual musical tones are created by reading out data values stored in a waveshape memory. Waveshape data values are read out alternately by two memory addressing circuits. One memory addressing circuit addresses out waveshape data values at a constant memory address advance rate corresponding to the fundamental frequency of an actuated keyboard switch. The second memory addressing circuit addresses out waveshape data points at a time variant memory advance rate. The two sets of read out waveshape data values are combined to produce a dual musical tone.

Abstract: Tones of percussion instruments produce different timbres, i.e. different tone waveshapes, depending on the strength of percussion. An automatic rhythm apparatus includes a rhythm tone generating unit which stores the tone waveshape produced from a hard percussion and also that from a soft percussion performed on a same percussion instrument. A rhythm pattern is constructed by rhythmically aligned tone command signals, for various percussion instruments, designating timings and volumes of tones to be produced. At each tone production, these two kinds of waveshapes are read out by mixing them appropriately. That is, when a loud tone is to be reproduced, its waveshape is read out from the waveshape memory for loud tones, while a soft tone is read out likewise from the waveshape memory for soft tones, and a tone of an intermediate volume therebetween is reproduced by reading out the loud tone and the soft tone at a mixing ratio complying to the desired degree of volume.

Abstract: An electronic musical instrument comprises an accompaniment keyboard; a memory of a relatively small capacity storing a set of accompaniment data sequentially aligned and constituting accompaniment patterns; a read-out circuit to successively read out the accompaniment data from the memory at given clock pulse timings; a judging circuit to judge whether each accompaniment datum read out indicates a predetermined specific value; a random signal generator for generating, independently of the data-reading-out timings, random signals each differing in value with time; an accompaniment data determining circuit to determine the contents of each read-out accompaniment datum when the latter is judged to indicate the specific value in accordance with the signal randomly outputted just when a judgement is made; and a tone generation determining circuit to determine the generation of the accompaniment tone based on the key depression information coming from the accompaniment keyboard and also to function, when the read-

Abstract: These small, inexpensive ornaments and novelties emit music and other sounds (such as simulated voice) when exposed to light, and can be placed out-of-doors in a garden. Being light-powered, they can operate for an essentially indefinite time, even though unattended.Each such ornament or novelty consists of a thematically configured body and a three-element working module sealed in a watertight can. It has no input keyboard or other terminal, and no display panel or other electronic or visual data output, except the audio output.Elements are (1) a circuit, preprogrammed to produce electronic oscillations corresponding to a tune or other sounds preestablished at manufacture, (2) a speaker receiving the oscillations and emitting the sounds, and (3) a solar panel powering the circuit. The speaker shuts off if light is inadequate for completely correct operation, and otherwise is amplitude modulated by the light level.

Abstract: A keyboard operated musical instrument is disclosed in which musical tones are created by reading out data values stored in a waveshape memory. The number of stored data points is reduced by storing the data values in segments corresponding to one-half of the number of data points for a period of a waveshape. By using synthesized data having a symmetry about the midpoint, the second half of the waveshape is recovered by a forward and backward memory address read of each waveshape segment. After reading each segment a predetermined number of cycles, an abrupt jump is made to the next segment of waveshape data points. The fundamental frequency of the tone is varied in a temporal manner by changing the memory advance rate of reading waveshape data out of memory in response to a frequency offset data corresponding to each segment of the waveshape data. An alternative embodiment is disclosed for a tone generator in which the musical waveshape is computed in real time from stored sets of harmonic coefficients.

Abstract: An automatic playing device for a musical instrument includes a memory unit which stores a plurality of discrete states, e.g., patterns of key actuation of a keyboard, which can be serialized and combined with or substituted for manual keying information from a keyboard or other control device. Combining and substituting are controlled by the actuation of one or more switches by a human operator. The operator can advance through the stored pattern by actuating a single key or by playing a simple sequence of notes on a keyboard.

Abstract: An electronic musical instrument of the sampling type is provided. The electronic musical instrument comprises a memory having a plurality of storage areas, and operates in one of full sampling, part sampling, full play and part play modes. Sampling data of waveform of a tone are stored into addresses of all the storage areas in the full sampling mode, and are stored into addresses of one of the storage areas in the part sampling mode. Thus, only one waveform is sampled and stored in the full sampling mode, whereas a plurality of waveforms can be sampled and stored in the part sampling mode. In the full play mode, the whole sampling data are read from the storage areas to form a tone, so that the tone can have a complicated waveform if the sampling data have been stored in the memory in the part sampling mode.

Abstract: A keyboard type electronic musical instrument in which note data and duration data are read out from a memory in accordance with the progress of a musical piece, and a control circuit (CPU) turns on display devices provided for individual keys on a keyboard in response to note data, thus training a player to operate keys specified by the display devices. The control circuit counts each instance of noncoincidence between a key represented by the note data and an operated key on the keyboard, and obtains deviations between a key operation timing defined by duration data and the timing of key operation on the keyboard. After the end of a performance, the control circuit informs the player of the number of the mis-key operations or the accumulation of key operation timing deviations by means of the display devices. A number of display devices corresponding to the accuracy of the performance are lit.

Abstract: In a synchronized sound recording and reproducing system including a tape recorder to playback a tape carrying time code information indicative of particular longitudinal locations of the tape, a sequencer having sound information programmed therein and a manually operated tapping key to be tapped by an operator to produce heat signals, a synchronizing signal generator for providing synchronism between the base sounds reproduced from the tape and the additional sounds reproduced from the sound information memorized in the sequencer, comprising beat interval detecting means operative to detect, on the basis of the time code information from the tape, the time intervals between the successive beat signals produced by the beat signal generating means, and rhythm information generating means for generating rhythm information based on the pattern of the time intervals.

Abstract: An apparatus for playing a portion of a melody so that users of the apparatus can competitively attempt to identify the melody includes a device for encoding the portion of the melody to be played and a device for reproducing the portion of the melody by decoding the encoding device. The reproducing device includes a decoder for generating electrical signals corresponding to the portion of the melody and a converter for converting the generated electrical signals to musical notes.

Abstract: A system for converting musical sounds into digital data for use with a electronic synthesizer. An infra red pitch sensor detects pitch of string vibration. Envelope of this signal is filtered and applied to a comparator with floating threshold. Square wave output of comparator is used to reset a continually running counter and latch valid data into a latch. Valid data is used as address for a memory which contains quantized values corresponding to standard musical notes. Transposition of keys may be accomplished in memory lookup table. Amplitude of input signal is detected by A/D converter, and with pitch information from memory lookup table is sent to processor. Processor makes decision when valid data is present, and when present outputs data to synthesizer.

Abstract: A keyboard operated musical instrument is disclosed in which the musical tones are generated by reading out data values stored in a waveshape memory. The number of stored data points is reduced by storing the data values in segments corresponding to one-half of the number of data points for a period of a waveshape. By using synthesized data having a symmetry about the midpoint the second half of the waveshape is recovered by a forward and backward memory address read of each waveshape segment. After reading each segment a predetermined number of cycles, an abrupt jump is made to the next segment of waveshape data points.

Abstract: External sound signal coupled through a MIC IN terminal is fed through an operating switch panel section to an A/D converter for conversion to a digital signal. The digital signal is stored in a record memory through a waveform R/W controller under the control of a CPU. The digital signal stored in the record memory is read out from the CPU according to control data stored in a work memory to be fed to an external sound system for sounding.

Abstract: A CPU supplies data write and read commands to only an address control section, and the address control section then designates, for the purpose of writing and reading data, addresses of a waveform memory in which external sound waveform data is stored.

Abstract: An electronic musical instrument includes circuitry for modifying an ordinary address signal which changes at a uniform rate over one cycle of a waveform, into a modified address signal whose rate varies in one cycle of the waveform by the use of a modification signal.The modified address signal accesses a storage device such as a ROM in which waveform data is stored, thereby producing the modified waveform data from the storage device. The modification signal is obtained from the ordinary address signal through a predetermined logic circuit.

Abstract: In a method for providing musical accompaniment in response to playing of a processor-controlled musical instrument, a plurality of processes corresponding to different musical components of the accompaniment are executed in a pseudo-concurrent manner. Each component includes a plurality of musical events related according to a tempo at which the accompaniment is to be sounded. A portion of one of the processes is executed to perform at least one of the musical events, whereupon the process is suspended for a musically appropriate period of time substantially equal to the time before the next event of the process. While the first process is suspended, a portion of at least one other process is executed to perform another musical event. The other process is then suspended for another musically appropriate period of time. Execution of the processes is continued in this manner, one portion of a process at a time, such that the processes overlap to produce a coherent musical accompaniment.

Abstract: In an electronic musical instrument, note frequency data corresponding to a plurality of temperaments are prestored and are selectively read out in accordance with a selected one of the temperaments, generating a note frequency corresponding thereto. Further, a plurality of note frequency data corresponding to each transposition operation for each temperament and selectively read out in accordance with a selected temperament and the transposition operation, thereby generating a note frequency corresponding thereto. Thus the temperament selection and the transposition operation can be performed with satisfactory stability and high frequency accuracy.

Abstract: An electronic musical instrument comprising detection means to detect time positions of an initial part and a terminal part of a voice, extraction means to extract pitch data of the voice, a plurality of processing means to subject the pitch data to different processing operations, means to successively select the processed pitch data of the plurality of processing means in correspondence with the respective detected time positions, and musical sound production means to produce a musical sound on the basis of the processed pitch data delivered from the selection means.

Abstract: A musical tone signal generator for an electronic musical instrument is constructed by a waveshape generator, a function generator and an interpolator. The waveshape generator successively generates adjacent two waveshapes of a plurality of different waveshapes which have been intermittently sampled in an actual produced tone. The function generator generates an interpolation function which is a function of time. The interpolator weights the adjacent two waveshapes in accordance with the interpolation function, combines the weighted two waveshapes and outputs the combined waveshape as a musical tone waveshape to be produced at a rate corresponding to a frequency of the musical tone waveshape. In the waveshape generator, the generation of next two adjacent waveshapes are performed when a value of the interpolation function has become equal to a predetermined value. As a result, it is made possible to obtain a good quality timewise spectrum change of the musical tone waveshape.

Abstract: Data for a plurality of musical pieces is preset in a ROM pack and also on a tape recorder. Musical piece data read out from the ROM pack or tape recorder is supplied from a control section to melody generators, a chord generator, a bass generator and a rhythm generator. Melody data, chord data, and rhythm data obtained from these generators are coupled through an amplifier to a loudspeaker.

Abstract: A musical instrument for producing musical sound including a wavetable for storing a plurality of samples in wavetable locations. An address generator addresses wavetable locations for selecting stored samples to provide audio output signals and for selecting stored samples to be modified and restored. New addresses for specifying wavetable locations are provided employing a modification operation independent from an output operation.

Abstract: More than one sub-intervals or time-windows are provided in a one-cycle period of a musical tone selected at a keyboard of an electronic musical instrument. Each time-window passes a sine wave having a frequency predetermined for the time-window. The envelope of the spectrum of a time-window is determined by the shape and the width of the time-window, and the envelope of the spectrum of a sine wave passed from the time-window will become the convolution of the spectrum of the time-window and the frequency of the sine wave. The total area of the frequency spectrum included as frequency components of a musical tone can be covered by several time-windows, each having a different length and passing a sine wave of a different frequency. An amplitude control means controls the amplitude of each sine wave independently. The controlled amplitude level determines the spectrum intensity of the frequency region influenced by the corresponding sine wave.