JPH02179698A - Processor for electronic musical instrument - Google Patents

Abstract

PURPOSE:To shorten the processing time by providing a storage means for operation having a register group where various musical sound parameters are exclusively stored and a data storage means which is indirectly addressed through this register group. CONSTITUTION:A RAM 34 consists of the register group and is exclusively used for operation of musical sounds. Various musical sound control parameters and musical sound waveform data are stored in a ROM 37 for control data as well as waveform as the data storage device. Register contents on the RAM 34 designated by the operand of a program in a control ROM 31 are referred to indirectly access the ROM 37. Only registers exclusively used for operation of musical sounds are used in the execution of the musical sound generating program in this manner. Consequently, registers used by another interrupted program are not rewritten during the execution of the musical sound generating program. Thus, it is unnecessary to save and restore the process state, and the processing time is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a processing device for an electronic musical instrument, and more particularly to its structural architecture.

[Prior art and its problems] In recent years, electronic musical instruments have been computerized.

However, the part related to the generation of musical tones that requires large amounts of high-speed data calculation is performed by dedicated hardware called a sound source circuit, and a microcomputer (CPU) is used to control the musical instrument from the human power cap 1 or console panel. input, M
(IDI and other external control inputs, inputs from internal or external performance memory, etc.) and transfers appropriate commands to the tone generator circuit to the tone generator circuit.

A microcomputer performs control input processing to the musical instrument.
A structure in which musical tones are generated using sound source circuit hardware (
architecture) has the problem of increasing the overall circuit scale (typically, the sound source circuit hardware occupies about twice the chip area of the microcomputer), and the range in which the sound source circuit hardware can be controlled by the microcomputer. There are problems such as the problem of having to become narrower, and the problem of major circuit design changes in the sound source circuit hardware that are required to realize specification changes such as changes in the method of generating musical tone signals and changes in the number of polyphonic sounds.

In view of these points, the applicant has continued to research an architecture that can simultaneously process musical instrument control inputs and generate musical tones using only a microcomputer, and has finally achieved its realization.

In order to realize a control device for an electronic musical instrument based on such a novel architecture, a microcomputer structure capable of generating musical tones that requires high-volume and high-speed data processing has been sought and explored.

For example, in a typical microcomputer, an internal register called a 7-cumulator or a general-purpose internal register is used as a temporary storage means for operation data. At some times, data from the data memory is input into the accumulator, and at other times, the result of arithmetic operation (for example, addition) of two pieces of data on the data memory is input into the accumulator. The data temporarily placed in the accumulator is returned to the designated storage location on the data memory. Using a microcomputer configured like this,
When performing musical tone generation processing, it takes a considerable amount of time due to frequent data transfers between the data memory and the 7 cumulators (or general-purpose registers), and it is difficult to achieve musical tone generation processing that requires handling a large amount of data. cause trouble.

[Object of the Invention] Therefore, an object of the present invention is to provide a processing device for an electronic musical instrument that is capable of generating musical tones in real time only by program control of a microcomputer without using conventional sound source circuit hardware. It is to be.

[Structure 1 of the Invention] According to the present invention, in order to achieve the above object, there is provided a program storage means for storing a program for processing an input to control a musical instrument and a program for generating musical tones, and the program. Address control circuit means for controlling the addresses of the storage means; an arithmetic storage means comprising a number of registers that are directly addressed by a program in the program storage means; and arithmetic operations between the registers of the arithmetic storage means. a data storage means that stores data necessary for generating musical tones and is indirectly addressed by a program of the program storage means via a register of the calculation storage means; operation control circuit means for decoding the instructions of the program in the storage means and controlling the operations of the respective means, wherein a digital data sample of the musical tone is generated by executing the program for generating the musical tone; The storage means for electronic musical instruments is composed of a microcomputer, and is used for calculations in executing the program for generating musical tones, and includes a register group for exclusively storing various musical tone parameters. A processing device is provided.

In this configuration, the register in the calculation storage means can function both as a so-called accumulator and as a means for storing data. Therefore, 1 normal 7 cumulators are not required. Furthermore, each register in the operational storage means is directly addressable by the program in the program storage means (although this does not mean that indirect addressing, such as addressing by index, is not possible); Therefore, using the arithmetic circuit means, arithmetic operations between registers can be performed directly (without going through an accumulator). Furthermore, each register in the arithmetic storage means can be dedicated (it can also be used for general purpose, and this does not mean to deny the use of some registers for general purpose), in particular, The calculation storage means includes a group of registers that are used for calculations during execution of the musical tone generation program and exclusively store various musical tone parameters (for example, envelope plate, phase value parameter, phase change width parameter, etc.). included. Therefore, by executing a musical tone program, arithmetic operations can be performed efficiently (to the maximum extent possible) between registers dedicated to these various musical tone parameters in the process of obtaining digital data samples of musical tones. It becomes possible to reduce the frequency of referencing data to the storage means. Therefore.

Daiwa data (musical tone parameters) can be processed at high speed,
For example, one register is used exclusively to store the current phase (waveform phase) value, and another register is used to store data about the change width of the phase value. Stored exclusively. In the musical tone generation process, when the conditions for updating the current phase value are met, the musical tone generation program issues an instruction to add the change width to the current phase value. In this case, it is not particularly necessary to read out the data of the current phase value and change width from the data storage means and to store the envelope value of the calculation result. The first
By using an operation code as an operand and using a register (second register) for storing the variation width as the second operand (operator), the operation control circuit automatically controls the operation control circuit. , the data of the first register and the second register are outputted and input to the arithmetic circuit means in which an adder operates, and the output (new phase value) is returned to the second register. In addition, in a slightly more complex system in which the width of change in phase value changes depending on the phase range, a group of registers (referred to as group A) that specifically stores data on the width of change within each range is used. Prepare a register group (group B) that exclusively stores the phase of the boundary of the range (boundary value data), and compare the boundary value of the register of group B with the current phase value before executing the addition of phase values. By doing so, the register with the change width to be selected from the A group is determined. In the processing steps in these two examples, there is no need to access data (musical tone parameters) from the data storage means; in other words, like a typical microcomputer, data is read from the data storage means and stored in the accumulator (or This means that processing such as storing data in general-purpose registers can be omitted.

Furthermore, as an effective means for maintaining the sampling period of musical tone generation, it is conceivable to use a timer interconnected control mechanism and execute a musical tone generation program every time an interrelated request is made (in the example described later). Musical tones are generated in the timer interwoven processing program) 6 In a normal microcomputer, in response to an interrelated request, it is necessary to save the state of the process at that point in time (after the interrelated ends, the process is restored, In this case, in accordance with the present invention, if the execution of the musical tone generation program (the program that interrupted) uses only dedicated registers to store musical tone parameters, then This means that the registers used in the program will not be rewritten during the execution of the musical tone generation program. There is no need to save the state of a process if the contents of registers related to that process are not changed. Therefore, the state of the process (state of general-purpose registers)
There is no need to save and restore the program counter, and processing time can be saved.

In one configuration example of the invention, the microcomputer is implemented with an integrated circuit chip. In the examples described below,
On a single integrated circuit chip, there is an input/output port for receiving control inputs to the instrument, a timer-interconnected control circuit for applying the timer-interconnected circuit, and a D for converting the digital data samples of the generated musical tones into analog signals. /
An A converter is also implemented. The arithmetic circuit means also includes a multiplication circuit used for arithmetic operations on waveform data.

【Example] The present invention will be described in detail below with reference to one drawing.

The overall configuration of the electronic musical instrument according to this embodiment is shown in FIG. 1, and the entire device is controlled by a microcomputer 1. In particular, according to the present invention, not only the processing of control inputs for the musical instrument but also the processing of generating musical tones is executed by the microcomputer l, and no sound source circuit hardware for musical tone generation is required. The switch section 4 is a control input source for the musical instrument, and information input from the switch section 4 is processed by a microcomputer l. The analog-converted musical tone signal generated by the microcomputer 1 is filtered by a low-pass filter 5, amplified by an amplifier 6, and outputted through a speaker 7. Power supply circuit 8
supplies the necessary power to the microcomputer 1, low-pass filter 5, and amplifier 6.

The internal structure of the microcomputer 1 is shown in a block diagram in FIG. 2. Each element shown in FIG. 0 is mounted on one chip. The actually manufactured chip has a chip size of 5 x 5 mm, has an eight-note polyphonic polyphony, and uses PCM (waveform readout method) as the tone synthesis method. It can also be applied to musical tone synthesis methods.

The control ROM 31 stores a program for processing various control inputs of the musical instrument and a program for generating musical tones, and a program word (instruction) at a specified address is sent from the ROM address control unit 39 via the ROM address decoder 32. Note that in the specific embodiment, the program word length is 28 bits, and a part of the program word is sent to the ROM address control unit 39 as the lower part (in-page address) of the address to be read next. Although the next address input method is used, the present invention can also be applied to a program counter method. The RAM address control unit 33 specifies the address of a corresponding register in the RAM 34 when an operand of an instruction from the control ROM 31 specifies a register. The operand may be an immediate value (such as when setting a numerical value in a register), and the RAM 34 is a group of registers used for general-purpose operations, flag operations, musical tone operations, and the like. As illustrated in FIG. 6, many registers are dedicated for calculating musical tones. The adder/subtractor, logic operation unit 35, and multiplier 36 constitute an arithmetic circuit (AU), which is used when the command from the control ROM 32 is an arithmetic command. In particular, the multiplier 36 is used to calculate musical waveforms, and as an optimization for that purpose, the first and second data inputs (for example, 16-bit data) are
It is designed to output data of the same length (16 bits) as the input. A control data/waveform ROM 37 serving as a data storage device stores various tone control parameters such as pitch data and envelope data (rate, level), and PCM (pulse code modulation) tone waveform data. Envelope data and musical waveform data are prepared for each musical tone.As shown in the figure, access to the control data/waveform ROM 37 is via the control RA.
RAM3 specified by the program operand of M31
(However, in this embodiment, the ROM 37 is an internal memory, and its operation is directly controlled by the same operation control circuit 38 that controls the operation of the RAM 34.) is controlled, so the time length for accessing the ROM 37 is the same as the time length for accessing the RAM 34).
Operation analysis section (operation control circuit) 38
decodes the operation code of the instruction from the control ROM 31,
Control signals are sent to various parts of the circuit to carry out the desired operation as instructed.

In order to execute the musical tone generation program in the control ROM 31 at predetermined intervals, this embodiment employs timer interaction. That is, by the interwoven control section 40 having a timer.

The ROM address control unit 39 outputs a control signal (
In response to this signal, the 1'lOM address control unit 39 saves (holds) the address of the next main program command, and returns the address to the beginning of the interwoven processing program (subroutine) in which musical tones are generated. Set the address instead. This starts the interwoven processing program. Since there is a return instruction at the end of the interwoven processing program, when this return instruction is decoded by the operation analysis section 38, the RO
The M address control unit 39 sets the saved address again and returns to the main program.

Input boat 41 and output boat 42 are 9! Used for key scanning of I board 2 and function keys 3. The musical tones generated in the interwoven processing program are converted into analog signals by the digital/analog converter 43 and output to the outside.

Figure 3 (A) shows the flow of the main program of the microcomputer 1 of this embodiment. Set initial values such as tempo etc.

At A2, the microcomputer 1 outputs a signal for key scanning from the output port 42, receives the state of the switch section 4 from the input port 41, and stores the state of the function keys and keyboard keys in the key buffer area of the RAM 34. Remember. In A3, the function key whose state has changed is identified from the state of function key 3 obtained in A2, and the instructed function is executed (for example, setting a musical note number, setting an envelope number, setting a rhythm number, etc.) , in A4, 1 obtained in A2
m that changed from the state of 1g12! (Key press, key release) identified 1 sound generation process A9 from the processing result of A4 in 0th order A5
Function key 3 on A6
When the demo performance key is pressed, R for control data and waveform
Demo performance data (sequencer data) is sequentially read from the OM37 and processed to perform key assignment processing for the sound generation process A9.In A7, when the rhythm start key is pressed, the control data/waveform ROM37
Flow-period timer processing A that sequentially reads rhythm data from and performs key assignment processing for sound generation processing A9
8, in order to know the timing of events required in the main flow, flow-co-time (this can be obtained by counting the number of timer interludes executed while going around the flow. This counting process is In the 0 sound processing A9, A5. A6,
From the data set in A7, various calculations are performed to actually generate musical tones, and the results are set in the sound source processing register (FIG. 6) in the RAM 34. A10 is a preparation process for the next main flow pass, and turns ON the NEW ON state that indicates the change to the key press state obtained in this pass.
NEW OFF to indicate a change in the state of turning on or releasing the key.
Perform processing such as changing the state to OFF.

Figure 3B shows the flow of the interwoven processing program in which musical tones are generated. Send to 43. As a result, the primary sound source processing B2, in which musical tone samples are given to the D/A converter 43 at constant pseudoperiods, is the key point of the embodiment; conventionally, this processing was performed on the sound source circuit hardware. was. In the zero-order interwoven timer process B3, which will be described in detail later, the timer register (in RAM 34) for flow-hand positioning is incremented by 1 each time the timer register (in the RAM 34) is passed, taking advantage of the fact that the interrelated time takes a predetermined time.

Note that in this embodiment, the registers to be written by the main program in the interwoven processing program are as follows:
Since the contents are not rewritten, there is no need to save and restore registers, which is normally performed at the start and end of interwoven processing. That is, since the registers on the RAM 34 are independent of registers related to musical tone processing and registers related to other processing, the transition from the main program to interwoven processing is performed with as little delay as possible.

Details of the sound source processing B2 are shown in FIG. 3C. After clearing the waveform addition RAM area (see FIG. 6) at Ct, processes 02 to C9 for eight channels are sequentially performed. At the end of each channel process, the tone waveform value of the channel is added to the data in the waveform addition RAM area.

FIG. 4 depicts the flow of the operation of the embodiment along time. A, B, C, D, E, and F are fragments of the main program (FIG. 3A), and interwoven processing (FIG. 3B) is executed at regular intervals. As shown in the time chart of FIG. 5, each time an interleaved state is entered, a musical waveform signal is input to the D/A converter 43, and a corresponding analog signal is output to the outside.

FIG. 7 shows in detail the processing from 02 to C9 in FIG. 3C for one channel. Channel processing is broadly divided into envelope processing (%FIC01-D7) and waveform processing (D8-D21).

FIG. 8 shows an envelope generated by envelope processing. The envelope of one musical note consists of several steps (segments).
It is shown in segments.

ΔX in the figure is the sampling period of the envelope,
Δy is the change width of the envelope value.

In the channel envelope processing (DI-07), an envelope is calculated for each sampling time and a check is made to see if the target level of the step has been reached. When they match, the target value is set in the current envelope register (see Figure 6), so it is detected in the main program's sound generation process A9 and the data (ΔX, Δy) for the envelope in the next step 7 is set. , target envelope fla) are set in each register.

In detail, in DI, a timer register for comparing with the envelope calculation cycle ΔX is incremented for each interconnect, and when it matches ΔX in D2, the addition/subtraction flag (sign bit) of the envelope displacement data Δy is tested in D3. to determine whether the envelope is rising or falling, D4 and D5 subtract or add the current envelope, respectively.D6 checks whether the current envelope has reached the target envelope value, and if it has, Set the target level to the current envelope. As a result, data for the next envelope step is set in the main program's sound generation fiqA9. Further, when the envelope is read as zero ry>current in sweat processing A9, it is processed as the end of pronunciation.

Next, waveform processing D8-021 will be described.

In waveform processing, the integer part of the current address is used to convert the waveform RO
Read the waveform data of two adjacent addresses from M,
The expected waveform value for the current address indicated by (!!i fractional part, tens of decimal parts) is obtained by interpolation. The reason why interpolation is necessary is that the waveform sampling period by Interabdo is constant, and the added value of the address (pitch data) will be over a certain range in application to musical instruments. (If you prepare waveform data for each, there is no need for interpolation, but it would increase the storage capacity unacceptably.) Since the deterioration and distortion of the timbre due to interpolation are more pronounced in the high range, 1.Usually, recording sampling of the H note is used. The original sound is reproduced at a cycle faster than the cycle. In this embodiment, it = (A
4) The playback cycle is doubled (see Figure 59). Therefore, when the address input is 0.5, A4 sound can be obtained. In this case, the address addition value is 0.529 for A#4, and 1 for A3. These address addition values are stored as pitch data in the control data/waveform ROM 37, and when a key is pressed, the pitch data corresponding to the key, the waveform start address, waveform end address, and waveform of the selected tone are generated in the sound generation process A9. The loop address is set in the corresponding registers of the RAM 34, ie, address addition value register, start address/current address register, end address register, and loop address register.

For reference, in FIG. 10, which shows interpolated waveform data with respect to time, white circles indicate waveform data values at addresses in the waveform ROM, and black circles indicate interpolated values.

There are various interpolation methods, but here we use linear interpolation. Describing the waveform generation processing D8-021 in FIG. 7 in detail, first, in D8, an address addition value is added to the current address to obtain a new current address. Compare the current address and the end address in D9, and if the current address > the end address, use DIO and Dll, and if the current address is the end address, use 012 to specify the next physical (address) or logical (operational) next address. calculate the address of
DI4 accesses the waveform ROM using the integer part to obtain the next waveform data. The loop address is the address following the operation E end address. That is, in the case of FIG. 9, the illustrated waveform is repeatedly read out. Therefore, when the current address is the end address, the waveform data of the loop address is read out as the next address (D l 3
).

By D15 and D16, waveform R is generated at the integer part of the current address.
Access the OM and read the current waveform data. Next, subtract the current waveform value from the next waveform value in D17, and
The difference is multiplied by the decimal part of the current address in step I), and the result is added to the current waveform value in step I)19 to obtain the linearly interpolated value of the waveform. This linearly interpolated data is multiplied by the current envelope buoy 4 to obtain the tone data value of the channel (D20), which is added to the contents of the waveform addition register to accumulate the tone data (021).

In the case of the channel processing program shown in FIG. 7, the data references to the indirectly accessed control data/waveform ROM 7 are 014 (or 013) and 01 of all steps.
There are only 6. All remaining steps are operations on dedicated registers on directly addressable RAM 4. Therefore, channel processing (musical tone generation processing) is executed at high speed. What brings about high speed is the structure of this microcomputer. Its elements include direct addressing to RAM4;
Examples include a large number of register groups constituting the memory, and a dedicated register configuration within RAMA that exclusively stores various musical tone parameters in musical tone generation processing.

Finally, to describe the circuit scale and operating time of a specific example (8-note polyphonic PCM sound source system), the control ROM is 112 Kbits, and the RAM 34 is 5.4 Kbits.
i t, control data/waveform ROM 37 (gray color is 10
0 tone) is 508 Kbits. One machine cycle is about 276 nanoseconds, and the maximum number of cycles of the interwoven processing program during operation is about 150. The execution interval (musical tone output sampling period) of the interwoven processing is approximately 47 microseconds.

As mentioned above, in the embodiment, the microcomputer itself generates the musical tones, so conventional behavioral circuit hardware is not required, reducing the circuit scale, improving yield, and reducing costs. , can provide high freedom of design IJIF.

[Modifications] This concludes the description of the embodiments, but various modifications and changes can be made without departing from the scope of the present invention.

For example, in the above embodiment, musical tones are generated by applying a timer interlude and executing an interwoven program in order to output musical sound waveform samples at predetermined time intervals.

By incorporating the P command) into the program.

Processing instead of the above-mentioned interwoven processing (hereinafter referred to as fixed time processing) may be executed at fixed time intervals.In other words, since the execution time of each instruction of the program is determined by the master clock, All you need to do is to insert (distribute) a fixed-time processing program that generates musical tones as a subroutine between the main program and the subroutine. Dummy instructions (No P instructions) may be distributed so that they can be processed in time.

In the embodiment and the above-mentioned modification, the sampling period for musical tone generation is always kept constant. It is also possible to generate musical tones with a variable sampling period.0 For example, in the PCM sound source method, instead of performing waveform interpolation processing, the waveform data at each address in the waveform ROM is used as is, and the time that advances by one address is used. (the time from reading the waveform data of a certain address to reading the waveform data of the next address) is proportional to the frequency (pitch data) of the musical tone. Time. This time interval control can be realized, for example, by presetting data corresponding to the frequency of musical tones in an internal timer of a timer interlaced control section, and performing interlacing every time the timer runs out. However, in the case of polyphonic application, the interval between interludes changes depending on the frequency of the musical tone using each channel, so a timer interlace control section and a timer interleave processing program are provided for each channel. Further, a D/A converter is also provided for each channel, and the conversion period thereof is made to match the period of timer interwoven processing of the corresponding channel.

In all of the above examples, the musical tone generation operation in the microcomputer and the operation of the D/A converter are basically in synchronization. Instead of this, an asynchronous method can also be considered.
For example, the musical tone generation output of a microcomputer and the D/A
A buffer structure is provided between the converter and the converter. To provide a microcomputer with the ability to generate a sample sequence of musical tones at a higher speed than the conversion period of a D/A converter. This can be achieved, for example, by distributing a large number of subroutines for generating musical tones in the main program. The sample string of musical tones from the microcomputer is stored in a buffer and sent to the D/A.
It is read out in synchronization with the operation of the converter and input to the D/A converter. The time from one musical tone generation subroutine to the next subroutine varies slightly depending on the execution status of the program, but assuming it is shorter than the conversion cycle of the D/A converter,
By writing the string of musical tone samples into the buffer, the remaining capacity of the buffer γ decreases, so the average calculation cycle of the string of musical tone samples of the microcomputer is changed in accordance with the remaining capacity of the buffer. In other words, a branch instruction is provided in the musical tone generation subroutine so that musical tone generation is performed selectively in the subroutine depending on the remaining capacity of the buffer. The musical tone is generated twice. In one configuration example, a buff 2-a mechanism and a D/A converter are prepared for each sound generation channel, and the conversion speed of the D/A converter is configured to be variable. This is because the ratio between the phase difference between the samples of the musical sound sample sequence generated by the microcomputer and the frequency of the musical sound is changed every limited range (for example, one octave range) in order to maintain high quality sound. The important thing is that the output of the D/A converter is
It is to have the intended musical tone frequency. The microcomputer shall maintain the ratio between the phase difference between samples and the frequency of the musical tone within the selected range (for example, within the range of 1 otave, the phase difference proportional to the frequency of the musical tone will be maintained between the musical tone samples). In this case, the microcomputer stores data corresponding to the above ratio in D
It is applied to a frequency control circuit (which can be configured with a programmable timer or the like) that controls the conversion cycle of the /A converter (and therefore also the read cycle of the buffer). This circuit generates control timing signals for buffer reading and D/A conversion according to the received ratio data. As a result,
The output of the D/A converter becomes an analog signal having the frequency of the musical tone.

For example, if the phase difference between musical tone samples generated by a microcomputer is l/N of one period of the musical tone, and the period of the musical tone is P, then the D/A converter is Convert one digital musical sound sample to an analog signal. Therefore, the time required to convert N digital tone samples is equal to the period P of the tone, and an analog signal having the frequency (1/P) of the tone is obtained.

In addition, various modifications are possible.

[Effects of the Invention] As described above, in this invention, by devising the structure of the microcomputer, it is possible to relatively easily generate musical tones that require large amounts of high-speed data processing on the microcomputer side. . As a result, the conventional sound source circuit/S-ware is no longer necessary. Therefore, the circuit scale of the entire device can be reduced, yield can be increased, and costs can be reduced. Furthermore, the degree of freedom in design is increased, and changes in musical tone synthesis methods and polyphonic numbers can be easily accommodated.For example, in the conventional technology, a four-note polyphonic sound source system and a PCM sound source system can be changed to 7x7m.
In the embodiment of the present invention, an 8-tone polyphonic, PCM sound source system (including a D/A converter) can be realized with a 5 x 5 mm chip, which was previously achieved with a 5 mm chip. Generally, it is considered that the circuit scale can be reduced by half or less.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an electronic musical instrument according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a microcomputer according to the embodiment, FIG. 3A is a diagram showing the flow of the main program of the microcomputer, and FIG. Figure 3B is a flowchart of the interwoven processing in which musical tones are generated, Figure 3C is a detailed flowchart of the sound source processing in Figure 3B, Figure 4 is a diagram showing the flow of the program over time, and Figure 5 is a diagram showing the flow of the program over time. 6 is a diagram showing a table of the musical tone generation RAM placed in the RAM 54 of FIG. 2, and FIG. 7 is a detailed flowchart of one channel processing of FIG. 3C. , FIG. 8 is a diagram showing an envelope, FIG. 9 is a diagram showing waveform data of the waveform ROM, and FIG. 10 is a diagram showing an interpolation calculation waveform along time. 1...Microcomputer, chicken 1...
・Control ROM, 34...RAM, 35...
. . . Adder/subtractor and logic operation unit, 36 . . . Multiplication base, 37 . . . Control data and waveform ROM, 3B.
...Operation analysis department. Patent applicant: Casio Computer Co., Ltd. Shizuku1Go"3"S7D'7 Uh! , 11) '7D - 3rd
8 Inmei 270% top! L t1 Procedural amendment interpretation (method) Drawing dated May 24, 1999 subject to amendment

Claims (2)

[Claims] (1) Program storage means for storing a program for processing inputs for controlling a musical instrument and a program for generating musical tones; address control circuit means for controlling an address of the program storage means; arithmetic storage means consisting of a large number of registers that can be directly addressed by a program; arithmetic circuit means capable of performing calculations between the registers of the arithmetic storage means; data storage means that is indirectly addressed by the program of the program storage means via the register of the calculation storage means; and an operation that decodes the instructions of the program of the program storage means and controls the operation of each of the means. control circuit means, wherein a digital data sample of a musical tone is generated by executing the program for generating the musical tone; 1. A processing device for an electronic musical instrument comprising a microcomputer, the processing device being used for an electronic musical instrument and comprising a register group for exclusively storing various musical tone parameters. (2) A processing device for an electronic musical instrument according to claim 1, wherein the microcomputer is mounted on an integrated circuit chip.