JPS60104997A - Electronic musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic musical instrument that generates musical tones whose timbre changes over time. It was made so that the tone of yuzu can be obtained by operation.

Regarding electronic musical instruments that generate musical tones whose amplitude changes over time and whose timbre (waveform) also changes at the same time, the applicant of the present application applied for patent animation No. 149148 (Unexamined Patent Application Publication No. 149148, 1975) on December 16, 1975 (Sho 52-73721)
For "electronic musical instruments" (hereinafter referred to as Hikari Application).

It is explained in detail in . In the electronic musical instrument shown in this earlier application, the musical sound waveform generating means has a temporary storage circuit such as RAM (Random Access Memory) and a data circulation path connected in a closed loop to a digital filter. By circulating the digital waveform data through the digital waveform, the data being circulated can be extracted as sound waveform data. By controlling the characteristics of the digital filter, such as the wave number components passed through the filter, the gain, and the 2+1 ratio, it was possible to generate a musical sound waveform that approximated the sound of a natural musical instrument.

However, an unresolved problem remains as to what kind of means should be used to control the various properties of the digital filter. In other words, if the conventional control method using the timbre control panel is applied, the timbre control panel is equipped with an extremely large number of operators, and a complicated control circuit is required to control the characteristics of the digital filter according to the operation status of these operators. This poses the problem of not only complicating the configuration but also complicating panel operations.

On the other hand, even if the conventional method is used, it is possible to simplify the novell structure and the control circuit by using a simple control style, but this does not limit the performance of the above-mentioned musical waveform generating means that can generate a wide variety of musical tones. I didn't fully demonstrate my abilities,
It wasn't a good idea.

The present invention has been made to solve the above-mentioned problems, and is characterized in that a program-storing computer is used to control a manual musical waveform generation device.

That is, the electronic musical instrument of the present invention has (a) a timbre control panel section that generates timbre selection information based on a timbre selection operation, and (b) a data circulation path in which a temporary storage circuit and a digital filter are connected in a closed loop. a musical sound waveform generating means configured to take out circulating data as musical sound waveform data by circulating the digital waveform data circulation path via the data circulation path; tc+the tone control panel section; A computer connected to the musical sound waveform generating means and storing a program, the computer configured to take in the tone color selection information and execute a process according to the program to control the characteristics of the digital filter. I have seven powers.

According to the configuration of this invention, the tone, tone color, etc. of the generated musical tones are determined by the program.

By selecting and changing the program, it is possible to create a wide variety of installations, and the performance of the above-mentioned musical sound waveform generating means can be fully demonstrated. Also, since the various control numbers necessary to control the generation of musical sound waveforms are created by a computer, it is only necessary to make it possible to select a favorite tone on the timbre control panel section. The channel configuration and panel operation can be greatly simplified.

The computer used in this invention includes a memory device that stores programs and a central processing unit (hereinafter abbreviated as CPU) that executes the programs Z. Particularly recently, the functions of the CPU can be changed to 15 or more depending on the purpose of use. ＜Run, simplify the circuit, and convert it into an LSI with a single power or decimal number of 1^1.
Since a combination of the following is commercially available as a microprocessor, the manufacturing cost of the device can be reduced by using a microprocessor in the CPH of the present invention. The drawings will be explained in more detail below.

FIG. 1 is a block diagram showing an electronic musical instrument according to an embodiment of the present invention. In the figure, 10 is a common information transmission path, and 10 is a CPU. CPUFi referred to in this specification includes a control circuit, an arithmetic circuit, and a register, together with a memory device located outside the CPU, and is a general-purpose device capable of processing data input from the input device of a terminal and outputting it to the output device of the terminal. means a device with data processing capabilities. Further, a microprocessor is assumed to be used as a preferred design example. Data processing by the CPU 20 is performed using a program stored in the memory device 22 and the CPU 20.
It is determined by the control signal given from the control panel section U.

Therefore, by changing these appropriately, the data processing method can be changed freely.

In Fig. 1, b) is a keyboard section, and 32 is a tone control panel.

Reference numeral 34 indicates a musical tone generation section, an opening display panel section, a change mode circuit (MODEM) for the communication line, and 39 a timer for supplying time information for data processing.

What is noteworthy here is that in conventional electronic musical instruments, the keyboard section, timbre control panel section, musical tone generation section, etc. are interconnected with dedicated wiring, but in this invention, instead of these wiring, A common information transmission path 10 is provided in the system, reducing the number of wiring lines and increasing the multifunctionality of the system.

In addition, 2], 5.31.33, 37 digits each cp
U2fl, CPU control panel section U, keyboard section 1], tone control panel section 32, musical tone generation section 34, display panel section, and an interface circuit provided between the common information transmission path 10, and the operation of these circuits. shall be included in the description of the operation of the CPU and each terminal device.

In the apparatus 1 shown in FIG. 1, the signals of each building that are transmitted between each device via a common information transmission path 10 are classified as shown in Table 1, for example.

In Table 1, the signal 812 includes control signals for writing and reading given from the CPU 20 to the memory devices, and the signal 816 includes the control signals for writing and reading given from the CPU 20 to the memory devices.
It includes signals such as sound generation control and tone setting generated by the PU 20 and supplied to the musical tone generator 34, the signal 821 includes signals such as instructions and data to be sent to the CPtJa), and the signal S31 includes signals for keys on the keyboard side. It includes a key on/off signal and a key data signal as key press information generated in response to an operation, and the signal S41 is a tone data signal as tone selection information generated in response to a tone selection operation on the tone control panel section 32. Signal 832 r 842 means direct access to the memory device G29, Signal 836 contains a key on/off signal and key data signal, Signal 846 contains a tone data signal, Signal 851 means program selection, CPU direct Includes signals such as control.

Here, signals 836 and 846 are similar to signals S3□ and S41, respectively, but signals 831 and 841
The tone generator 34 is not supplied to the CPU 20 as in the example shown in FIG.

The signals "'17 + S37 + S47 are the same or similar to the signals S16, 836°846, respectively.

In addition, signals 818 + 3B + 848 are signals for displaying the status of the CPU, terminal equipment (in this case, the keyboard section), and tone control panel section 32, respectively. When Yume's status is displayed,
This is convenient for control in the next stage.

In Table 1, the signal S12 + S21 + S51
Similar signals are sent and received in electronic counters that perform office data processing or technical data processing, and since they are well known in the technical field, their explanation will be omitted. Further, an external storage device, an external data processing bag W, etc. are connected to the common transmission path 10 shown in FIG. The number N is exchanged between these devices and the devices shown in Table 1, but the parts related to external storage devices and external data processing devices are generally Since this is well known in the field of electronic machine technology, its explanation will be omitted.

The formats of these signals and the format of the common information transmission path to be determined according to the formats y-h can be freely selected depending on the design.

The signals shown in Table 1 can generally be divided into an address section, a data section, and an instruction section.

In addition, the address part is a machine address that specifies the device shown as the receiving side in Table 1, and a device address that specifies which one of them exists if there are several devices, such as a musical tone generator. , data address, etc., which manually specify which register in the device is to be sent, but for example, all of these signals may be transmitted in a t-bit serial format, and both f! # information transmission path 10
It is also possible to use one line of transmission line. In such cases, interrupt priorities are determined for each device, and interrupts are controlled according to the priorities. In addition to accepting and processing these interrupt requests, the CPU also handles program changes (selections), jumps, stops, and waits. Since these matters should be determined by design as to how to configure the electronic musical instrument of the present invention, their explanation will be omitted.

Next, the configuration of the musical tone generator 34 will be explained.

The signals to be input to the musical tone generator 34 from the common information transmission path 10 are a timbre data signal, a key data signal, and a key on/off signal, that is, an envelope start signal and a release start signal. The fundamental frequency of the musical tone generated by the musical tone generator 34 is determined by the key data signal, the attack waveform is started by the envelope start signal, and the release waveform is started by the release start signal. The shapes of the attack waveform and release waveform, that is, the shape of the musical tone amplitude envelope and the musical sound waveform, are determined by the timbre data signal.

By the way, the attack and IJ
It is known that by gradually changing the musical sound waveform during the IJ-s, and therefore by changing its harmonic content, it is possible to obtain musical tones with preferable tones similar to those of musical instruments such as pianos, harps, and pianos. Electronic musical instruments are the most suitable for generating such musical tones because the tone data signal can be easily changed by selecting or changing the program.

FIG. 2 is a block diagram showing an example of a disaster in the musical tone generating section 34. In the figure, the signals given to the musical tone generating section 34 from the outside include the following la) to te). There is.

ta) Key code indicating turned-on key 2 This key code is an octave code OCC indicating the octave to which the turned-on key belongs, and a note indicating the name of the note corresponding to the turned-on key among the 12 note names in the octave. Code NTC and t
The octave code OCC and note code NTC are stored in the register 800 and the register 500, respectively.

[b) Parameter codes A1 and A21A3 for determining the initial waveform of musical tones These codes A1. A2. A3 is each register 1
40, 150, and 160.

Ic) Parameter codes P, Q for determining the characteristics of the digital filter 5 These codes P p Q are stored in registers 520 and 540, respectively.

[dl Musical sound waveform switching signal S for cutting a certain sound waveform from an initial waveform to a circulating waveform This signal S is 1-bit No. 48 and is stored in register 2].

(e) Musical sound output enable signal E for making musical sound generation Y'oJ'tie This signal E is a l-focus signal and is stored in the register 71.

Block 1 surrounded by a dotted line represents the initial waveform generator, and the second
In the example shown, there are memories 11, 12, 13 storing different tone waveforms, and multiplication circuits 14, 15.

16 and an adder circuit 17, and the parameter codes A1, A2, A37! The initial waveform can be changed arbitrarily by changing l-. In addition, for convenience of explanation, numbers (+6 as examples, Memo! J 11 , 12 ,
Reference numeral 13 denotes a ROM in which 16-bit digital codes (including positive and negative signs) representing the amplitude at each sample point obtained by dividing one period of the musical waveform into 1,024 equal parts are stored in bands in the phase order of the temple points. (read-only memory).

2 is a selector, a 3-digit first-in-first-out type memory (hereinafter abbreviated as FIFO memory), 4 is a shift register, and a block surrounded by a dotted line is a 5-digit digital filter. The shift register 4 and the filter 5 are circuits for circulating the musical sound waveform output from the selector 2 through the filter 5 every cycle and converting it into an M-order musical sound waveform according to the characteristics of the filter 5. This is explained in detail in Chapter 3.

In the central example shown in FIG. 'filter 5 by changing
The characteristics of the device can be changed. For example, by setting the value of the parameter code P to pYp>O, it is possible to make the 19th low-order overtones have almost no loss, and the high-order overtones have a characteristic that decreases rapidly over time. can do. Further, by finely setting the value qY of the parameter code Q, the gain and attenuation rate can be controlled, and the waveforms of the rise and fall of musical tones can be simulated. moreover,
By setting p=o and q=1, it is possible to simulate the continuous waveform of a musical tone.

Reference numeral 6 denotes a sound system including a D/A converter, an output amplifier, a speaker, etc., and a gate circuit that divides the output of the musical tone signal from the liF I FO memory 3 by 1.

8ON clock pulse generator, 81 is an AND gate, 8
2 is a frequency dividing circuit, 83 is an address counter, 85 is an address counter output connection wire IJ<m device l, 86 is a flip-flop, 501 is a continuous clock pulse generator, 5
02 is a counter for writing p61JtJI of the FIFO memory 3, and 503u is a counter for controlling the reading of the FIFO memory 3.

The 340% characteristic of the musical tone generation section shown in FIG. 2 is such that musical waveforms are written into the FIFO memory 3 at a constant clock speed and read out at a variable or locked speed within a range that does not exceed the writing clock speed. , the number of words is controlled by controlling the octave code OCC to change the number of samples or the number of words in one round tc11 of the Sakae sound waveform.

The operation of the circuit shown in FIG. 2 will be explained below using numerical examples.

Specific examples of the chord structure of the octave code OCC, the octaves it represents, and the number of sample points for one period of the musical sound waveform for each octave are shown in Table 2. (hereinafter abbreviated as 2 [MHz] for simplicity) a clock pulse φo having a frequency of 2 [MHz] is generated. This 2 [MHz] clock pulse φ0, which intermittently passes through Goo 1-31Y as described later, becomes the master clock pulse φG for the initial waveform generator 1, digital filter 5, and shift register 4.
used as. Since the ROMs 11, 12, 13 and the shift register 4 store 16 bits of data per candy, the master clock pulse φG is divided by 1/16 by the frequency dividing circuit 82 and input to the address counter. In this way, the address change and the synchronization with the master clock pulse φG? You can take it.

Since it is safe to change the number of words in one cycle of the musical sound waveform in accordance with Table 2 in the shift register 4 as well, for convenience, the shift register 4 uses RAM (random access memory). 1
3 (t, 024 words x 16 bits 7). Note that the register 51 has a capacity of I candy x 16 bits.

゛The address counter 83 is composed of 10 binary stages connected in cascade, and its output is connected as shown in Fig. 3 by the address counter output connection control device 685.In Fig. 3, c9 + c8 +... ct, c
o is an address counter 8 in order from MSB to LSB
．． 3 parallel outputs, a9 + a13 + "・"
1+'O indicates the read address of ROMII, 12.13, and the write and read addresses of RAM4 in order from 10 pitons MsB to LSB.

For example, the octave code OCC is logical r 100
If it is in J, the lower 6 bits of c9~co are c5~C#
These are the upper 5 bits a9 to a4 (a9 to aoO), and 60'' is output to the bits below 83, so the input pulse to the address counter 83 is 1.
The addresses of ROMII, 12.13 and RAM4 change by 16 each time the signal is generated, so the read address is 0, 16, 32, 6 of J008.
As shown in Table 2, a musical sound waveform with a number of words of 64 is calculated and written into the FIFO memory 3.The FIFO memory 3 is a 64 candy x 16 bit memory, and writing is performed intermittently. Start-up is performed continuously using clock pulses with a low frequency such as the write clock pulse, and the generation frequency of the start-up clock pulse generator 5010 is 3rd regardless of the octave code OCCVCVC.
As shown in the table.

In this embodiment, the read clock pulse generator 501 uses a variable frequency division circuit, and the clock pulse φoY note code NT from the clock pulse generator (9) is used as the read clock pulse generator 501.
The frequency is divided corresponding to C, and 12 persimmon type read clock pulses corresponding to the two note names are generated.

Table 3 The readout clock pulse frequency of Table 3 will eventually be 4FIF.
O Memory 3 write clock pulse frequency 2 (MH
z]/16=125 (KHz).An example of the time relationship between writing and reading of the FIFO memory 3 is shown in FIG. 4.The pulse waveform P50 in FIG.
3 indicates a change in the count of the readout control counter 503, and each time the count reaches number 0 (number 64), the flip-flop 86 changes the value from the counter 503 to '-'').
Set according to pulse. Then, an I'll laJ signal G86 consisting of the output Q of the flip-flop 86
is set to l'', and the AND gate 812 is turned on.

As a result, the mask clock noise .phi.G and the address counter output + the address signal from the exit control device 85 are output, so that the code data representing the musical tone waveform is outputted from the selector 2 and written into the FIFO memory 3. Pulse P502 in FIG. 4 represents the output pulse from the frequency divider circuit 82, and is supplied to the input signal line 502 for write control of the uFIFO memory 3.

Since the pulse frequency of P 503 is lower than the ・V pulse frequency of P 502, when the first scanning pulse of P2O3 arrives at FIFO memo +73 ve, P2O
The data of at least one candy is F by the first pulse of 3.
It has already been written into the IFO memory 3. therefore,
Only reading from the FIFO memory 3 can be performed continuously. Therefore, during the period when signal G86 in Figure 4 is 1'', F
While writing, data is sequentially read, but when the count of the counter 502 for write control reaches the 64th check (edge 0), the 7 lip-flop 86 reads PO from the counter 502.
It is reset according to the FF pulse. Thereafter, writing to the FIFO memory 3 is stopped until the flip-flop 86 is set again by the PON pulse, during which time the read data is lost.

In this way, writing to the FIFO memory 3 is interrupted every 64th word, and for example, in the octave of AI-G1# in Table 2, A
In the octave of 7~G7#t, Eine Sakagata's (i4/1
The readout is interrupted every 6 cycles, but in either case, the readout is continued and a musical sound waveform is generated.

Also, even if the frequency of the clock pulses generated by the lamp readout clock pulse generator 501 is the same < 28.16
Even in the case of 0 [KHz], when the octave code OCC is at logic "000", the fundamental frequency of the musical waveform read from the FIFO memory 3 is 28.160 [KHz:
) Total 1,024 = 27.5 [Hz], and when the octave code OCC is in the logic "llO", it is 21316
0 (KHz) ÷ 16 = 1. ．． 760 (Hz).

The digital code of the musical sound waveform outputted from the FIFO memory 3 is manually input to the sound system 6 via the gate circuit 7, where it is converted into an analog voltage, and if necessary, it is pronounced with a brilliant effect added to the sound. be done. Since the sound system is well known, a description thereof will be omitted.

As is clear from the above explanation, in the musical tone generator 34 of the embodiment shown in FIG. 2, both ]P! ]'s emotional glaze transmission line 10
Via the signals S, E, note code NTC, octave code OCC, parameter code A1.

By giving A2+A3+PyQY, it is possible to generate a musical tone having a desired timbre at the fundamental wave number corresponding to the pressed key. Due to the nature of these data, the note code NTC and octave code OCC are kept constant during musical tone generation, but the parameter codes P and Q are changed in the groove chamber to form a desirable musical sound waveform in the attack section and IJ IJ-su section. This is a common design. The parameter code A11A21A3 is changed to Y& after selector 2 is disconnected.
It is also possible that the order may be changed as appropriate before the marriage.

Data NTC and OCC are generally fiii M part 3
0 to the common information transmission path 10. Any conventionally known circuit may be used to generate and send this data, but an example thereof is shown in FIG. The same code represents the same part, and the common information transmission path 10 is the address 5.
Also, the supply bus A (1ol), data bus BNO2), and control bus C (103) are shown separately.
Diagram design? 11, the interface 31 has note codes NTC12 Yuzu, i.e., 12
8 = 96 (JAM is equipped with a software that detects the key state χ, but it is a v1 board) The number of keys installed is 61.

The pulse generator 316 supplies the lock signal φl for scanning to the counter 312, and the pulse generator 316, counter 312, decoder 311, OR gate 313, shift register 314, and latch 315 constitute a key state detection device. The lowest four stages of the counter 312 are connected in hexadecimal form, and the decoder 311 is also connected in a corresponding manner. Furthermore, the outputs of the decoder 311 other than those corresponding to the 61 keys can be omitted. With such a counter configuration VC, the lower 4 bits of the latch 315 directly represent the note code NTC, and the upper 3 bits directly represent the 1-octave code occ7a1''.

In the example shown in FIG. 5, the keys are connected in a light emitting order, and only the key having the most ambiguous order among the keys that are turned on at Il'71 is connected to the logic terminal 301. ″l
" is supplied, and when the count value of the counter 312 reaches the value corresponding to that key, a logic "1"(/') pulse is output from the OR gate 313 via each AND gate. The register 314 is for delaying one round of these σ Luzers scans, and the output of 319 was not present in l[+?l@ scan, but was detected in the golden scan. Since the key-on point is 7), the output of the AND gate 320 is the signal for the enlope start.Similarly, the output of the AND gate 320 is present when the 11φ IJ is scanned. In this scan, since it has disappeared, the pulse KOFF tη, which represents the key-off point 7, is
J Serves as a lease start signal. and gate 319
The output of the counter 312 is set to 3 by the output pulse KON of the counter 312.
]5, the output of the latch 315 is the note code NTC.

This becomes the octave code oCc. When a predetermined address signal arrives at the address decoder 317, the output of the ratte 315 is read out through the gate 318.

In addition, a gate enable signal GE given from the control 9s ClO3 is added to the gate 318VCjd.

An example of the configuration of the timer 39 is shown in FIG. In the timer shown in the figure, the pulse Ps for reading the FIFO memory 3
o3 (See Figures 2 and 4) Input to the Z frequency divider 386, select a predetermined bit of the divided output data of the frequency divider 386 by the data OCC in the selector 387, and select the selected bit Since the time is measured using pulsens, the unit of time measurement is one cycle of the musical sound waveform.

In FIG. 6, 388 is an address decoder, 389 is a counter, 390 is a comparator, 391, 392
.

393 is lunch, 394, 395, 39f respectively
i is an AND gate, and the corresponding latches 391, 3! A data latch pulse is sent to J2, 393, and the data of data bus B (102) is input to the latch corresponding to the output content of the address decoder 388 at that time. The octave code OCC is input to the latch 391, the control signal of the counter 389 is input to the latch 392, and the time data t1 + t2 + t3 of each state of waveform generation is input to the latch 393, which will be explained in a later section. explain.

When the data of the counter 389 and the data of the latch 393 match, the comparator 390 outputs a pulse shown as Ptimer in FIG. 6, and the CPU 2 (Wl+includes 1, which is the rear guard in 1i1L) will be explained.

Above, regarding Figure 2, -9 of signal usage in terminal equipment.
1' and explained an example of the 1M transfer between the common information transmission path 10 and the fist part nod for the sugar 5 diagram, but the CP
The mechanism for transmitting and receiving signals between the memory device 22 and each terminal device via the common information transmission path 10 is well known in the technical field of electronic computers, and is shown in FIG. A similar signal exchange mechanism can be used in electronic devices, so the details regarding this will be omitted.

In addition, since the interrupt from the terminal device to the CPU and its processing are performed in the same way as in the general electronic meter 1-4 Iso, a general explanation will be omitted.
- As an example, a flowchart is shown in FIG. 8 in which an interrupt is generated by the KON e KOFF pulse in FIG. 5 and the Ptimer pulse in FIG. 6 to generate a musical tone having the waveform shown in FIG. 7 T6.

The king program in the flowchart is a program that repeatedly performs scanning of the tone color control board 32, polling of the display board 36, etc., as shown on the left end of FIG. 8, and returns to the king program when the interrupt is completed. Not even.

For interrupts caused by KON, the address decoder 317 (
(FIG. 5), the address is sent to gate 318 (i1).
+1 note code NTC and octave code O
CC is read. Next, as the initial 1'10, the state -
If 0 is set, CPU2f) is state=.

The parameter code corresponding to A1. A2. A3, note code NTC, :tcube: 7-)'o CC, parameter code P, Q (represented by Pl, Ql in Figure 8)
At the same time, the signal S is sent out as S="0", so the selector 2 inputs the output 'iF I FO' of the initial waveform generator 1 to the memory 3 during this period.

Also, send out 1yal on the time data and latch 393 (
Figure 6) While inputting the data to the counter for lunch 392
The counter 389 is reset and enabled according to the counter reset signal cR and the counter enable signal CE. Next, the musical sound output enable signal Ei is sent to guide the gate circuit 7, and the FIFO memory 3
output to the sound system 6. Now KON
interrupt ends and returns to the main program.

Next, when the counter 389 reaches a count value corresponding to the time data tlK, the comparator 390 KARAPA, TI/SP
timer outputs and an interrupt by Ptimar occurs. In the case of an interrupt by Ptimar, the state is advanced by 1 after determining which number the state is in, and when state = 1, No. 48 S becomes S2''
1", the selector 2 inputs the musical sound waveform iF I FO that has circulated through the filter 5 to the memory 3, and the parameter code PI + Q input by the previous KON interrupt.
1 generates a waveform as shown in FIG.
3, and as before, return to the raw program after setting the counter 389 kelisent and enable [7].

Next, when the counter 389 reaches the divisor value corresponding to the time data t2, the comparator 390 outputs the pulse Ptim.
er outputs and an interrupt by Ptimer occurs,
1 in the state is "1" and becomes state = 2, and the corresponding parameter codes P and Q (P2 in Figure 8)
+ Q2) is sent out, and state 2'' is shown in Figure 7.
T: A boss waveform is generated. Furthermore, since the timer 397 is disabled (the counter 389 is disabled), an interrupt caused by Ptimar is prevented from occurring due to the passage of time mj.

After state-2, an interruption occurs due to KOFF, which enters state-3, and the corresponding parameter codes P and Q (represented by Par Q3 in FIG. 8)
The waveform shown in state 3 in FIG. 7 is generated.
Ru. Then, the time data t3 is sent to the Y latch 393, the counter 389 is reset, and the program returns to the enabled backend program.

Next, when the counter 389 reaches a count value corresponding to the time data t3, an interrupt is generated by Ptimar.

At this time, the state becomes state-4, and the gate circuit 7 is made non-permanent by the year number E, the musical tone cuff is disabled, and the program returns to the king program.

Therefore, a waveform as shown in FIG. 7 is generated overall.

The parameter code A1゜A2. is determined by the performer.
A3. If you wish to change P or Q or change the history of the CPIJIII control program, just operate the switches on the timbre control section 32 or the CPU control panel section 24 as appropriate.

If this is done, an interruption will be made and a sound generating operation will be performed in response to the change operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a musical tone generator according to an embodiment of the present invention; FIG. 2 is a block diagram showing an example of the configuration of a musical tone generator in the electronic musical instrument; FIG. FIG. 4 is a connection diagram for explaining the follow-up control operation of the address counter output in the tone generating section, and FIG. 4 is a time chart for explaining the writing/reading operation of the F'IFO memory in the musical tone generating section. A block diagram showing an example of the structure of the keyboard section and its interface circuit in the above-mentioned child instrument, FIG. 6 is a block diagram showing an example of the structure of the timer in the above-mentioned electronic musical instrument, and FIG. 7 shows the above-mentioned musical tone generation. A waveform diagram showing an example of the honor waveform generated in the main program.
4! 'Y is a flowchart. 10...Common information transmission path, M)...CPU, 22
...Memory device, 2/I...CPU system, 1 board, 3
0...Keyboard section, 32...Tone control 1I41 keyboard section, 3
4...Music music student section, 36...Display board section, :38...
・Variation modulation circuit, 39...timer. Toshiaki Izawa, patent attorney, representative of Nippon Chestnut Manufacturing Co., Ltd. Figure 1

Claims (1)

[Scope of Claims] (Tone control panel unit that generates tone selection information based on an AL tone selection operation; (b) musical sound waveform generating means having a data circulation path in which a temporary storage circuit and a digital filter are connected in a closed loop; , which is configured to circulate the digital waveform data through the data circulation path and output the data being circulated as musical sound waveform data; A total of nine devices were connected to each other and stored nolograms, and were configured to take in the timbre selection information and execute the process of controlling the characteristics of the digital filter according to the program. Electronic equipment.