JPS6145288A - 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 [Technical Field of the Invention] The present invention relates to an electronic musical instrument having an effect function for changing musical tone frequencies such as vibrato, vibrato bender, pitch bender, voltamento, or glitsando.

[Prior art]

Conventionally, in electronic musical instruments equipped with such effect functions, when applying multiple effects at the same time, the calculation processing to change the frequency of each effect was performed completely separately and asynchronously. [Point] Therefore, the calculation processing of frequency changes is performed separately for each effect], and the CPU (Central Processing Unit) has to perform calculation processing for one of the effects alternately, and the CPU is exclusively used only to realize the effect function. Unfortunately, the CPU could not be used effectively and the load on the CPU would increase.

[Purpose of the invention]

Therefore, it is an object of the present invention to reduce the burden on the CPU in effect calculation processing, so that the CPU can perform more control processing.

[Key points of the invention]

In order to achieve this objective, the present invention is configured to synchronize the arithmetic processing of at least two of the plurality of effect functions such as the vibrato.

〔Example〕

Hereinafter, one embodiment will be described with reference to the drawings. FIG. 1 is an overall block diagram of an electronic musical instrument. In the figure, 1 is the CPU (central processing unit), and the CPU has a pass line BU.
A ROM (read only memory) 2, a RAM (random access memory) 3, and a tone RAM 4 are connected through S, a keyboard 6 is connected through an interface 5, and a switch input section 8 and an I/L are connected through an interface 5 and an interface 7, respectively. The converter 16 and the pender 17 are connected to the interface 9t, and the intermediary register section 10 and the musical tone creation section 11 are connected to the interface 1.
The effect register sections 13 are connected to each other via 2. The effect register work 3 is connected to the musical tone creation section 11,
In addition, the musical tone creation section 11 is connected to an amplifier 14t and a speaker 1.
5 is connected.

The CPU 1 is a device that executes various operations such as arithmetic operations according to a control program stored in the ROM 2. Further, the RAM 3 is a memory that temporarily stores intermediate result data and the like during processing by the CPUI. The timbre RAM 4 is a memory that stores 20 types of timbres arbitrarily set by each mode switch of the switch input section 8. In addition to switches for setting tone, the switch input section 8 also includes switches for adding voltage, pitch bend, vibrato, vibrato vent, rhythm, and the like. Further, the output of the bender 17 is converted into digital pender data by the A/D converter 16, and is provided to the CPUI as data for determining the magnitude of pitch bend or vibrato bend.

The register section 10 has various registers that will be described later with reference to FIGS. 2 and 3, and these registers are used by the CPU for arithmetic processing to assign a sound generation channel to the operated key for each key operation. It is.

On the other hand, the effect register section 13 has registers 08Cn, Reg, etc., which will be described later with reference to FIG. . In addition, the musical tone creation section 11 has a musical tone creation system for eight channels formed by arithmetic operations based on the time-sharing processing method of the CPU.
Each operating key on the keyboard 6 is assigned, a musical tone signal for each operating key is created, and a synthesized musical tone is emitted through an amplifier 14 and a speaker 15. In that case, the musical tone creation section 11 receives data from the effect register section 13 and adds voltament, vibrato, etc. to the musical tone of each operation key.

Next, each register of the register section 10 will be explained with reference to FIGS. 2 and 3. In FIG. 2, each register 0PRegswpReg and FPReg are both used for indexing each line (pointing to a channel).

That is, OP Reg holds the value of the channel where the key was previously turned on. WPReg is a key assigner (
This key assigner is a work pointer which is a circuit that allocates channels to operation keys by CPU arithmetic processing. FPReg holds the value of an empty line when it is found. FOUNDF R
eg is TRUE when there is an empty line, FA when there is no empty line
It is set by each data t-CPUIK called LSE.

Further, the register PORTAF is set with data such as TRUE when the voltage key is turned on, and FALSE when the voltage key is turned off.

In Figure 3, 8-bit capacity NL Reg (
New Line 5tatus), its 0th bit, cupidth, ..., 7th bit correspond to the 0th channel, 1st channel, ..., 7th channel, respectively,
When a new channel is designated, the corresponding pit is turned on. The contents of each bit are turned OFF every time the check of all lines is completed, and the contents of NL Rag are transferred to the corresponding bits of OLReg, which will be described next, in preparation for the next channel assignment.

The QL Reg has a total of 8 bits and corresponds to channels 0 to 7 from the lower side, and also transfers and stores the data from the NLRag.

TL Reg(Trigger Line St
(atua) similarly has a capacity of 8 bits, and is 0 from the lower side.
~ Compatible with 7 channels. And it turns on when the key is turned on.
It is turned off when the key is turned off.

Furthermore, WORK n Re (g is the final frequency information (pitch frequency) of the musical tone assigned to each channel is set, and based on this the musical tone is produced. With reference to FIG. 7, effect register section 1
Each of the three registers will be explained. In FIG. 4 (1), O8C! lReg is a register that holds the previous key code of each channel from 0 to 7, and consists of eight registers. Note that n has a value of 0 to 7, and means the 8-channel musical tone creation system (the same applies below).

N5Cn Rag is a register that holds the current key code of each channel. Also, VALUEnR6g is the absolute value lN5C-O8C of the difference between the key codes of the two keys that are subject to voltamento calculation or glissando calculation.
This is a register that holds the value of I for each channel. More 5IGN! LReg is a register that holds the signs of ■ (plus) for upward voltament (glissando) and θ (minus) for downward direction for each channel opsF 141g is voltament (glissando)
This is a register in which data that determines the speed of the motor is set, and it is variable by a cutout switch. ΔPITCH
nR@g is a register that holds minute pitch data that is added (subtracted) every 5m5ec for each channel. Note that a method for calculating the minute pitch will be described later.

More specifically, the PITCH'n Reg is a register that holds the cumulative value of the minute hits for each channel. C8C
Reg is set to the current key code that is currently turned on.

FIG. 4(2) is a diagram illustrating the relationship between the registers shown in FIG. 4(1). The method for calculating the minute pitch data ΔPITCH+7) will be explained with reference to this figure.

That is, it is calculated by the following formula (!).

ΔPITCH=IO8C-NSCIXρS F/B I
As... (1) However, BIAS is a constant for positioning a semitone or less.

I'll give you specific numbers and explain. For convenience of explanation, PSE is 1 to 5 Fta (hexadecimal expression), BIAS is 2" (10 t), minute pitch calculation period is 31 Sec, and the number of keys on the keyboard is 61 keys (1ω5 C-) from pitch C1 to C6.
N5C=3C□6).

1) When the slowest voltament of ρ5F=1 is applied 1) O8C=O(C1), N5C=1(CriΔPITC
H=rlO−11XI/1d4=9,765625X
10-4 The cumulative number of times for voltamento is l Q-11/9. , 765625XiO-'=t0
Since the calculation cycle for 24 times is 8 m5 ec, it takes about a2 sec.

It) osc=o, N5C=3C□6(Ca)ΔPIT
CH=I 0-5CIX1/1024=α058593
75 The number of times of accumulation is 10-5 CI/(LO5859575 = 1024 times, which takes about a2sec.

2) P S F = 5 When the fastest voltage of Fta is applied 1) O5C = O, N5C = 1 ΔPI TCH = I Q-11X5FI g/ 102
4=α061525457 The cumulative number of times is 1. 10-11/α06. It takes about 156m5ec 17 times in t's 23437.

If) OS C=Oz N SC; 3 CtsΔ
P I TCH=I O-3C1a l X 3Fta
/1024=A69140t525 The cumulative number of times is: l D-3C,, 17 times in l/19140625, approximately 156 m5eC is required.

FIGS. 5 to 7 show registers used to create effects such as vibrato other than the voltament. That is, FIG. 5 is for pitch bending, and includes a register to which pender data set by the aforementioned penda-F is input, a register to which unit data γ' for the penda data is input,
PITCHBEND where the multiplication result of the pender data and the unit data r', that is, the pitch bend data is input.
Rlgl FIG. 6 is for vibrato, VIB CRegs where vibrato waveform data is input; VIBPT Rag where vibrato depth data is input.

VIBWAVE where the multiplication result data of both data is input
Furthermore, FIG. 7 is for vibrato bending, each register into which the multiplication result data α of the pender data, unit data and 1-car data is input, and VIBC Raglt.
There is a VIBBEND Rag to which vibrato bend data of the multiplication result data of the vibrato waveform data input to the 0VIBc'Reg and the data α is input.

Next, the operation of the above embodiment will be explained at 70-- in FIGS. 8 to 21.
Explain with reference to the chart. For the sake of explanation, I will start by adding voltament as an effect. Therefore, the three keys of pitches C4, G4, and E4 are operated in sequence, then the voltament key is operated, and then the three keys of pitch C8I EatG are operated in sequence to apply upward voltament. Let's take an example of the case.

When you turn on the power switch and start playing, the 8th
Step S1 of the 7cr-chart in the figure. S.

The initialization processes of initialization α) and initialization (2) are performed. Therefore, initialize (1) is the first
The flowchart in Figure 0 is executed, and at first KTL, NL
, the OL register is set to turn off all channels (7; step If). Next, N5Cnl@g is cleared (Step E), and OPl (eg is also cleared. Next, in Step E, an aggressive fault tone is generated.

In the initialization (2), the data of the NL register is transferred to the OL register according to the flow shown in figure K11 (step N1), and then each channel of the NL register is set to OFF (step N,).

Next, the ICCPU 1 outputs a key common signal for the keyboard 6 to the pass line BUS and performs a key scan (step S). Therefore, the output of each key on the keyboard 6 is written to the RAM 3 via the interface 5 (step S4).
, CPUI determines whether or not a key has been pressed from the data content in this RAMa (X step S). When it is determined that no key has been pressed, it is determined whether all keys have been scanned or not (step S6).
), "If NOJ, return to step S, and repeat steps S to S until all keys are scanned.

If the key of pitch 04 is turned on, step S
, proceed to step 81m and set pitch 04 to C8CReg.
The key code will be written. Then PORTAF R
It has been determined whether the ag data is I”TRUEJ or not, and the voltage key has not been turned on yet, so r
The result is NOJ (step S□6). Also, OPP register data "0" is set on the WP register button and becomes "0" (step S2). Furthermore, this step 81? is the execution of the rotation method of the key assigner. Also F
Data f rFAI and SEJ are written to OUNDF Reg (step S1°). Since this is my first key-on after setting up WPRe, there is no key code for the 0 channel of NSCnReg.

Next, proceed to step S, and the C8CRag data “C4
” and N8Cn checks the match with leg data rOJ, and since it is “NO”, step st.

Proceed to TL Rag contents (0 channel is now rOF
FJ)'t-See, the above data of TL Rag is ON
It is determined whether or not it has been executed (step 526).

However, since "NO", step St? Go to F
It is checked whether the data of OUNDF Rag is rFALsEJ or not. Since it is rYESJ, the process proceeds to step S2a and the data "TRU
EJt-set. Also, WPReg data l”o
Set J tFP'R=g (step S
,).

Next is WPReg? It is incremented to "1" and it is determined whether the result is f8J (step S
,. ) Since this is not the case, the WP RegO value remains "1" and the process proceeds to the next step 5jlK.

In addition, when WP Rag becomes "8", it automatically becomes "mouth".
Do the work to restore it.

Next, in step SSt, it is determined whether the data of PORTAF Rag is rTRUEJ, and since "NO", the process proceeds to step SSt.

Next step S. Now, WP Rag data “1”
It is determined whether or not the data "0JVC" that OF Rag has matches, and since it is "NO", the next step S,
. After that, the WP register is incremented in step S, 0, and the current WP register data is
1'' is returned to rOJ, step 88!
p J6y 5alt 5ffi11゜5tat
stl SR@s 5lit 530t s
at is repeated seven times. That is, during this time, W P Re
Value of g ii1゜2.3. ..., changes to 7,0.

Then, it becomes "0" and OF Reg is set at step S0.
If a match of data "0" is detected, the process proceeds to step 834, where it is determined whether FOUNDF Reg is TRUE. But rY E S J, step 8
Proceeding to step 3s, data C4 of O20:n RegKNSCn Reg is stored using the content "0" of FP Reg as an index. Next, in the process of step 5all, the key code C4 of CSCReg is set in the 0 channel of N5Cn Reg using the content "0" of FP R.g as an index. Step S again? Use the content “0” of YoshiFP Rag as an index
Set the 0th channel of L Reg to groNJ. Next, in step SSa, data “0” of FPRag is set to OF.
Reg, and the key assigner's search start line pointer is updated.

Next, the key-on process of steps S and I starts, but the details of this process are shown in Fig. gX12. In this case,
First, in step 8, PORTAFReg is set to TR.
It is determined whether it is a UE or not, and since the answer is "NO", step 1. Then, the key "C6" of channel 0 of NSCnRag is transferred to channel 0 of 08Cn Reg. Next, the key code C4 of the 08Cn Reg is transferred to the 0 channel of the WORK Rag (step Kl). Next, at step 1, it is determined whether there is a vibrato or not, and since it is "NO", the process proceeds to step 2, where it is determined whether or not there is a vibrato bend. Proceed to the process of determining whether pitch pend is present. Since it is set and rNOJ, next step is 1? The key code in the WORK Rag is sent out, and a key-on instruction is issued (
In step ), a musical tone signal of pitch C2 is generated by the first channel system of the musical tone generating section 11, and the tone signal is emitted from the speaker. Then, the process returns to step S6.

Next, in step S, if the key capture has not been completed, steps S, S, S4 are executed and the process returns to step S, and the C4 key remains on. Proceeding to step StS, the key code "C2" is set in C8CReg again to 0, and step S8
After the processing in step 6, data "0" is set in WPR.g (step S1), and FOUNDF RegK data I"FALSEJ is also set. Then, in step S,
. Then, you can see the 0 channel of N5cn Rsg.
Key code C4 is obtained. In step 811, both match "C4", so step S! Go to 1,
The data "ONJ" of the 0 channel of TL Rag is obtained. Then, in step S0, it is determined whether the data is "ON", and since it is rYESJ, the process proceeds to step 80, and N is obtained using the content "0" of WPRag as an index.
Let's call it L Rag's Lochyannel erONJ.

Next, the process proceeds to step S6, or if the process proceeds to step S7, a key common signal for the portamento key is output, and the data is input to the CPUI (step S&
), the change can be seen. Since the voltament key has not yet been turned on, the process proceeds to step S□4, and after key-off processing, which will be described later, returns to step S. .

Thereafter, when the key of the second musical tone E is turned on while the key of the first musical tone C4 is fully turned on, the key "K4" is set in C8CReg in steps S2 to Ssk and 5lff. Then, through step S□6, step S8.
Then, data "0" of OF Reg is transferred to WPReg, and rFALSEJ is set to FOllDF R@g (step S□) 0. Next, step S. yoj) WP Reg data “
0” to N5Cn Reg 0 channel data “
C4" is obtained, so in step S, 1 is "NOJ", proceed to step S□, and the data of WP Reg is "0".
”, the data rON of channel 0 of TLReg is obtained, and rYESJ is obtained again in step S26. Then, WP゛Rθg is incremented by 1 and becomes “1”. Then, through step SSt, WPReg is OF
Reg(rOJ),! - Since there is a mismatch (step 8!2), proceed to X step S, and N5CId Reg
Data "0" for one channel is obtained. Then, in step S, the answer is "rNO" and the process returns to step S5.

Next, 1 channel data roFF of TL Rag is detected, and in step Sta, it becomes rNOJ, and in step S! ? Proceed to step S8. Then FOUND is set to "TRUEJ.

Then FP RegKWP Rsg's "1" is transferred, and step S, in the crowd. By default, WPReg is "2".

Below, until WPReg returns to "0", step S
,. *S! ip St's 5t6s sz
'rt 5ellsS,. ysj. t5S1y
83! is repeated, and when the value of WPRag becomes rQJ, ``YESJ'' is obtained in SaS through step S, t-, and the process proceeds to step SSa.

In step SSS, key code E is set to channel 1 of 05Cn Rag, and then N S CnR
"K4" is set in channel 1 of ag (step S, 6). Furthermore, 1 channel of TL Rsg is ON.
(step S, ri, and step S, QPR
FP Rag data "1" is set in eg.

Next, key-on processing <1*Ksom in step
K*s Ksom Kxze Ks+eK□
, K1. is executed, and the second musical tone is emitted.

The operation after the third musical tone G4 is turned on together with the other musical tones C, , E is also the same as that described above.
4 is assigned to the second channel and the sound is emitted.

Then, when the Voltament key is turned on, this occurs in steps S,,S,. PORT
Data rTRUBJ is set in AF Rag (
Step S, 2).

Next, the data “0F
FJ is written (step 5ta), and the next step 81
4 and return to step S2.

Next, when the pitch keys Cs, Es, and G5 are turned on in sequence, the key for pitch C6 is detected in step SII, and the key C5 is set in C'SCReg (step 51s). Next, in step ste, “YE
S'' and the process proceeds to step S18&C, where WPReg is cleared. This step S is a process using the fixed line method of the key assigner in the case of voltament.

Next step 5ills J. is executed and step s
At, key code C3 of C8CRag and X5Cn
A mismatch in the key code of the 0 channel of Reg is detected, so the process proceeds to step StS, and further steps S,
Step S, through 6~Sss-Ssak.

Return to And further 1 (Step 5 to (Now, WPRe
The data of g is r I J ) s Stt* Ste
~5sttS0 is repeated until the data in WPReg returns to "0". And when it becomes "0", step 533
1 884 to step SSS, S s a ~
S3.

is executed.

Step S. In the key-on processing of FIG. 12, in step □, enter rYEsJ, then proceed to step 2, and check the magnitude relationship between key code C8 of N S CnRag of channel 0 and key code C4 of 08cn Rag. was judged, and now N S Cn >
Since it is OS Cn, it becomes rYEsJ, and the data of the difference between the key codes is calculated, and 'VALUEn Rag
channel 0 (step Ks). Also, since it is an upward voltament, in the next step 6, the sign of 0 channel Ic (El) of 5IGNnReg is set.

Next, in step 7, ΔPI is calculated according to the equation (1) above.
TCH is determined and set to 0 channel of ΔPITCHn Rag, and then set to 0 channel of ΔPITCHn Rag.
The channel is cleared and the initial value is set (step Ka) o and the key code C4 in OS C2ifl @g is WORK! l Reg, and calculation of voltage for channel 0 can be executed (
). Then, the obtained pitch frequency is transmitted to the 0 channel, and a key-on instruction is issued to start the upward voltament of the 0 channel (steps, ?, □).

Even if the pitch keys E, G, are turned on in sequence,
They are processed in the same way as the keys for the pitch C3, and the N S C
It is assigned to channels 1 and 2 of nReg. Therefore, in the key-on process in FIG. 12, steps Ks, Kt, L to +n, KH)
17F Klg is executed in the same way, and voltament is started in the 1st channel and the 2nd channel as well.

After the voltament has started as mentioned above, for example, by setting the time 8m5eCk to the timer, F), 7
Calculation processing such as voltament shown in Figure 1113 has a cycle of 9 m.
This is repeatedly executed at 5ec to create sound effects such as voltamento.

Therefore, now only the voltamento is acting,
In FIG. 13, when this calculation process is started, first,
A counter n specifying a channel is set to V (step L1). Then that channel in TLnReg (
In the current example, it is determined whether the data of t=to channel) is "ON", and if it is not roNJ, step L
1. Proceeding to step L2, the counter n is incremented by 1, and it is determined whether the resulting count value has reached "8" or not. If not, it means that the processing has not been completed for all channels, and the process returns to step L2. , on the other hand, if it is "8", the calculation is completed and waits until the next calculation cycle.Also, step L! If the data in TLn Rag is "ON", the process advances to step L, and the key code in 08Cn Rag is transferred to WORKnRag. Then P.O.
It is determined whether the data of RTAF Rsg is rTRUEJ (step T4), and now it is rTRUEJ.
Therefore, voltament calculation and voltament addition in steps Ls and La are performed. In this case, the determination process + of the presence or absence of vibrato in step L7, the presence or absence of vibrato bend in step LX0, and the presence or absence of pitch bend in step L14 result in "NOJ" and the result is "proceed to step L17". The pitch frequency based on the calculation result is sent to the musical tone creation section 11, and a voltament is created.Then, the steps Lia and L19
be processed.

Regarding other vibrato, vibrato pend, and pitch bend, as can be seen from the flowchart in FIG.
, the vibrato calculation and vibrato addition are executed, and vibrato is applied.

If the vibrato switch and the pender 17 are operated simultaneously, the vibrato bend is determined in step LX0, and the vibrato calculation in step L, step L,
The vibrato pend operation in step L□ and the vibrato bend addition in step L□ are respectively executed, and vibrato pend is applied.

If the pitch bend operation is further performed, this is determined in steps L and 4, and the pitch bend calculation in step LIS and the pitch bend addition in step LI6 are executed, respectively, to perform the pitch bend.

The characteristic feature of the arithmetic processing in Figure 13 is that up to 3
A combination of three effects: voltament, vibrato, and pitch bend, or voltament,
A combination of three effects, vibrato bend and pitch bend, is synchronously mapped in one calculation processing 7 row,
They can occur simultaneously. Therefore, the load on the CPU is significantly reduced, and the remaining time can be used to effectively perform other processes (for example, touch response).

As can be seen from the flowchart in Figure 13, vibrato and vibrato bend are no longer applied at the same time, but any other combination of the two, and of course, each independent occurrence, is freely possible. can.

Furthermore, in the flowchart of FIG. 12), step Ks=K4 is a process when downward voltament is applied. Also, add 1yo vibrato to each step, and add 1 to each step. Vibrato bend addition, 1s per step
The pitch bend addition processes shown in FIG. 12 are executed when the vibrato, vibrato pend, and pitch bend effects have been applied before the key-on process shown in FIG. 12 is executed.

Next, the contents of the voltament calculation (step Ll) will be explained with reference to the flowchart of FIG.
The current ΔPITCH is added to the accumulated value up to that point, a new accumulated value is calculated, and PITCH'nRθgK is set. And the new cumulative value is VALUEn
It is determined whether the data has become larger than the data in Reg (step A), and if "NO", this process ends.
The next voltament addition process begins. On the other hand, if it is rYEsJ, the data of MAVALUEn Reg is PITCHnReg.
is set, and the next voltament addition process begins.

Also, the voltament addition (step Ls) is
As shown in the flowchart in Figure 8, it is determined whether the code in SIGNnReg is e or not, and if it is ■, the process proceeds to step G, and wORKn is added to the accumulated value in PITCHmanReg.
The data in Rag is added and the new value is WO
RKn: [(Set to eg, resulting in an upward voltament. On the other hand, if it is not e, proceed to step G,
PIT'CH'n from data in WORKnRag
The accumulated value in Rag is subtracted and the new accumulated value is W
oRKn Rag is set, resulting in downward voltament.

Next, the pitch bend calculation (step Lss)
In accordance with the process shown in the flowchart in Figure 5, vendor data and unit data r' are multiplied, and the resulting data is PI
Set to TCHBEND Reg (Step B
,). Then, the next step L16 is pitch bend addition, and in the flowchart shown in FIG. 19, it is determined in step E1 whether or not the pitch bend sign is e.
The data in NDRag is added to the accumulated value in WORKn Reg, and the result is set in WORKn Rag, resulting in an upward pitch bend. On the other hand, if it is not e, the process proceeds to step E, where the notator in PITCHBEND is subtracted from the accumulated value in WORKn Rag, and the result is set in WORKn Reg, resulting in a downward pitch bend.

Next, the vibrato calculation in step L is the process shown in FIG. 16, in which the vibrato waveform data in VIBCReg and the vibrato depth data in VIBPT Rag are multiplied, and the result is
is set to Then, the vibrato addition in the next step L is the process shown in FIG. Go ahead, W.O.R.
The data in VIBWAVE Rag is added to the accumulated value in Knleg, and the result is set in WORK nRag to create an upward vibrato.

On the other hand, if it is not ■, step Hs Vc & Mi, WORK
VIBWAVE R・g from the accumulated value in n Rag
The data in is subtracted and the result is WORKn Re
Input gK to create a downward vibrato.

Furthermore, the vibrato bend calculation in step Litt Ltx is not the same as the process shown in FIG. 17. First, the unit data r' in step D1 is multiplied by the pender data, and the result is input to the data a register.

And next step D, data α and v-work 13c
The vibrato waveform data in Reg is multiplied and the result is data 1'.
Enter in g. Then, in step Lts, vibrato bend addition jl), in FIG.
The cumulative value in Rag and the data in VIBBEND are added, and the result is input to WORKnReg for upward vibrato bend addition. On the other hand, if not ■, WO
The VIBBEND data is subtracted from the accumulated value of RKn Reg, and the result is input to WORKn Rag to create a downward vibrato bend.

Note that when the voltament key is turned off, the process of step Stt in FIG. 8 is executed.

Next, with reference to FIG. 9, the key-off process in step S□ will be briefly explained. First, WPReg is cleared (step F1), then this WP RagO
TL Regs OL R with value as index
egs NL Re gO Obtain each content (Step F!
), TL Regs NL Reg',
It is determined whether each OL Reg is ONL or not. Then, if TLReg is ON and other Regs are not ON, proceed to step F6, and TL Reg't
'0FFL,, Outputs the key-off command (step F'
). Next, in step F, WPRegt is incremented, and if the value is not "8", the process returns to step F, and step F! ~F.

The process is executed again, and if the value becomes "8" again, the key-off process for 8 channels is completed.

〔Effect of the invention〕

As explained above, the present invention provides an electronic musical instrument equipped with at least two of effect functions such as vibrato, vibrato bender, pitch bender, voltamento, and glitsando, and for changing the musical tone frequency of each of the effect functions. Since the electronic musical instrument has means for synchronously performing the calculations for at least two of the plurality of effect functions, the rate at which the CPU is exclusively used for calculations of the effect functions is reduced. Therefore, the CPU can operate for other processing, for example, response to key touch, which has the advantage of substantially improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is an overall circuit diagram of an electronic musical instrument according to an embodiment of the present invention, FIGS. 2, 3, 4 (1), and 5. 6 and 7 are explanatory diagrams of various registers, FIG. 4 (2) is a diagram showing the relationship between the registers in FIG. 4 (1), and FIG.
Figures 21-21 are 70-charts illustrating the operation. 1...CPU, 2...ROM, 3...
...RAM, 4...Tone RAM, 6...
...Keyboard, 8...Switch input section, 10...
...Register section, 11...Music tone creation section, 1
3...Effect register section, 15...Speaker, 16...A/D converter, 17...
・Vendor. Figure 1 Figure 2 Port ===== PORTAF F4. ';'9 Figure 3 11 TORK R (Method) % formula % 1. Indication of the case Patent Application No. 166966 of 1982 2. Name of the invention Electronic musical instrument 3. Relationship with the person making the amendment Patent applicant address 2-6 Nishi-Shinjuku, Shinjuku-ku, Tokyo Number 1 Name (
144) Tadashi Kashio, Representative of Casio Computer Co., Ltd.
Male 4, Agent address: 1-13-4-5 Nishi-Shinbashi, Minato-ku, Tokyo Date of amendment order: November 27, 1980 (shipment date) 6. Drawing subject to amendment 7, Details of amendment Figure 2 ~ Figure 21 is corrected as shown in the attached sheet. Figure 2 [================
= Koshi ＞ ゛〉〉 ス ス ス ス ス ス ス ス ス〉〉〉〉〉〉〉〉〉〉〉 し し ら ら し し し し し し しFigure 16 Figure 17 Figure 19

Claims (1)

[Claims] In an electronic musical instrument equipped with at least two of effect functions such as vibrato, vibrato bender, pitch bender, portamento, or gris sando, an operation for changing the musical tone frequency of each of the plurality of effect functions is performed. An electronic musical instrument having means for synchronizing at least two of the effect functions.