JPS59136788A - Enunciation control for 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 electronic musical instruments, and more particularly to a sound generation control method when the key-on time is very short.

For example, a single-note electronic musical instrument (number of sounding channels = 1)
, if the next key is pressed immediately after a key is released, that is, while the musical note of the same key is still in the decaying state, the musical note in the decaying state is dumped (quickly decaying). ) to sound the next key. Also, when a key is pressed and another key with a higher priority is pressed,
After dumping the musical tone of the currently pressed key, musical tones of other keys with higher priority are generated. In addition, when a new key is pressed when all of the multiple sound channels are already assigned to an electronic musical instrument that uses the sound assignment method, the sound that is in the decay state among the musical sounds that are currently sounding is damped, and the sound is assigned to that sound channel. Assigns the newly pressed key and produces a musical tone.

In this way, in electronic musical instruments with a limited number of sounding channels, if a key with a higher priority is pressed,
Dump any of the musical tones currently being generated and generate the musical tone of the key with higher priority.

By the way, in such conventional electronic musical instruments, the pressing time of the key to be newly sounded (time to sound rHI)
If the pitch is very short, musical tones in the same key may not be generated at all, or the musical tones may attenuate in the middle of the attack (rising) state, even though musical tones should be generated with priority. arise. For example, FIG. 1(a) shows a key press time of 1 for a certain key in a single-note electronic musical instrument, and FIG. 1(b) shows a key press time of 2 for a key with a higher priority than key 1, In addition, FIG. 3(C) shows the envelope waveform of a musical tone with a key of 1. Note that the symbol S in the figure (/-I).

- S41O respectively indicate a silent state (key-off shape), attack state, sustain state, decay state, and dump state. As shown in FIG. 1, while the tone 2 on the key and 1 on the key is in the dump shape W, HS 4, lI! In the case of 1S, the tone of key 2 is not produced at all. Also, the second
In the figure, (A) to (C) are waveforms corresponding to FIG. Note that this figure shows a case where the set tone is a percussive tone, that is, a musical tone that immediately shifts to a decay state S after the attack state S1 ends.

In the example shown in FIG. 2, the tone 2 on the key enters the decay state S3 in the middle of the attack state S1, and as a result, the tone 2 on the key is not sufficiently produced.

In view of the above-mentioned circumstances, the present invention provides a sound production control method for an electronic musical instrument that can sufficiently produce musical tones of the same key within a range that is not unnatural even when the sound production time of a high-priority key is very short. It is characterized in that when the sounding time of a key with a high priority is shorter than a predetermined time, the sounding time of the same key is regarded as the above-mentioned predetermined time or a longer time and the sound is emitted.

Hereinafter, one embodiment of the present invention will be described with reference to drawing 'Ir. FIG. 3 is a block diagram showing the configuration of an electronic musical instrument to which the sound generation control method according to the present invention is applied. In this figure, reference numeral 1 denotes a keyboard, and each key on this cupboard 1 is provided with a key switch for detecting key operations.

The key press detection circuit 2 detects the on/off state of each key by sequentially scanning the output of each key switch of the keyboard 1, and sequentially outputs the key code KC of the key in the on state.

Note that the key code KC is set so that its value increases as the pitch of the key increases.

The highest note detection circuit 3 sequentially compares the key codes KC output from the press detection lB@ro 2 with each other, and detects the key code J'(C (i.e., among the keys being pressed) that has the largest value. The highest pitched key: 2-1'Kc) is detected, and the detected key code KC is converted into the key code λIKc.
and outputs it to the latch circuit 4 as key code MKC.
While outputting key-on signal KONI (“1” signal)
is output to the differentiation circuit 5. In this case, the key-on signal K
ON 1, when the key code MKC does not become "0" once and changes continuously, it becomes a "0" signal for a very short time at the time of change, and returns to a "1" signal again (Fig. 9a)
) to ←), see Figure 10 (a) to)).

The differentiating circuit 5 is a circuit that generates a narrow key-on pulse KONP at the rise of the key-on signal KONI.
The generated key-on pulse KONP is supplied to the load terminal L1 of the latch circuit 4, one input terminal of the AND gate 6, and an envelope generator (hereinafter abbreviated as EG) 7. AND gate 6 is signal SS output from EG7.

This is a gate whose opening and closing are controlled by a signal inverted by an inverter 8, and its output is simultaneously fed to a one-shot '/-) circuit 9. Is the one-shot circuit 9 an AND gate 6? triggered by the key-on pulse KONP supplied through the ``'1'' signal for a predetermined time T? The output signal of this one-shot circuit 9 is supplied to the OR gate 10 as a key-on signal KON2.

The OR gate 10 is a circuit that ORs the key-on signal K ON 2 and the key-on signal K ON 1, and its output signal is supplied to E and G7 as the key-on signal KON. Thus, the above-mentioned components 6.8.9.10 constitute the key-on time correction circuit 11.

Here, the function of the key-on time correction circuit 11 mentioned above will be explained. In the following description, it is assumed that the AND gate 6 is in an open state. Figure 4 ``) ~ ←) is for each i
2 is a waveform diagram showing a key-on signal KON1, a key-on pulse KONP, a key-on signal KON2, and a key-on signal KON. FIG. As shown in these figures, the key-on signal K O
If the noggle width of the key-on signal KON2 is larger than the pulse width T (predetermined time described above) of the key-on signal KON2, the pulse width of the key-on signal KON and the key-on signal KONI are the same, while the pulse width of the key-on signal KON1 is Pulse width is key-on signal K ON 2 pulse l! When IT and IT are smaller, the pulse width of the key-on signal KON is the same as the pulse width T of the key-on signal K ON 2. That is, the key-on time correction circuit 1.1 adjusts the key-on time (No. M KO
If the pulse 'X of N1 is greater than the predetermined time T, the key-on signal KONI is output as it is as the key-on signal KON.On the other hand, if the /< pulse width of the key-on signal KONt is smaller than the predetermined time T, the key-on signal KONI is output as the key-on signal KON. The pulse width of KONI is expanded and output as the key-on signal KON of pulse IiT.

Next, the timbre selection circuit 13 is constituted by a plurality of color switches and an encoder for timbre selection, and encodes the output of the timbre switch turned on to form a musical tone signal as timbre data TD. 14 and EG7.

EG7 is key-on signal K ON, key-on pulse KO
Based on the sewing data TD outputted from the NP and sweat color selection circuit 13, create envelope data ED whose value changes sequentially as shown in FIG. 1 (c) or FIG. 2 e→, for example. This is a circuit for outputting to the musical tone signal forming section 14, and its review 1 is shown in FIG. In FIG. 5, the envelope plate memory 16 stores a data group consisting of five types of rate data RD "α0" to "α4" corresponding to each state (hereinafter referred to as state) So-34 of the envelope waveform in -Tf color. This is a memory that is stored in correspondence with each data D, and each data group is tone data TD.
Each rate data RD in the designated data group is read out in accordance with the state data ST output from the state control circuit 17. Note that the rate data RD rα mentioned above. ” and “α2” are D in all data groups. The gate circuit 18 is a gate circuit whose opening and closing are controlled by the timing signal TP output from the calculation timing generation circuit 19, and outputs rate data RD to the calculation circuit 20 when it is in the open state.
When in the closed state, data rOJ is output. The calculation timing generation circuit 19 is synchronized with the clock pulse signal based on the clock pulse signal and tone color data, and generates a different timing signal TI? for each tone. is generated and output to the gate circuit 18. This circuit 19 will be explained in detail to him.

Performance: times! '320 is a circuit that adds or subtracts the data supplied to the input terminal 1000 and the data supplied to the input terminal B, and the control terminal C to the state S. - State data ST indicating one of -82
is supplied, the respective data of input terminals A-B are added and output, while the control terminal C to state S8
Or, if state data ST indicating 84 k is supplied, the data at input terminal A is changed from the data at input terminal B.
"R3a and output. Delay flip 7 data block (hereinafter abbreviated as DFF) 21 has a clock pulse generator (
Reads the output data of the arithmetic circuit 20 every time Jll is executed,
The read data is output to the musical tone signal forming section 14 (third Iyil) as envelope data ED.

On the other hand, the envelope level memory 22 is a memory in which level data I and D corresponding to each tone color data TD are stored. , 82 to S4 are supplied with f#, the data "n" is output, and when the state data ST indicating ST is supplied with f#, the value corresponding to the timbre data TD is output. level data LD is output to the comparator circuit 23. The ratio axis circuit 23 compares the level data LD and the envelope data ED, and outputs a match signal EQ ("1" signal) to the state control circuit 17 when the two match Jf5:. State data ST is created based on the signal EQ1, key-on signal KON, etc., and outputted to each part of the circuit, and an attack pulse AP is outputted to the load terminal of the latch circuit 25 (FIG. 5).

The details of this state control circuit 17 will be explained later. The So @ output circuit 26 is a circuit that detects when the state data ST indicating the state So is output from the state control circuit 17 and outputs a signal 83G ("1" signal), and the output signal SSo is Inverter 8 (3rd
(Figure).

Next, the latch times P! shown in FIG. 25 reads the key code MKC stored in the latch circuit 4 when the attack pulse AP is supplied, and outputs it to the tone signal forming section 14. The musical tone signal forming section 14 receives the key code MKC from the latch circuit 25.

Tone color data TD, EG supplied from the tone selection circuit 13
A musical tone signal is formed based on the envelope data ED supplied from 7, and is output to the sound system 28. The sound system 28 generates the supplied musical tone signal as a musical tone.

Next, the operation of the above-mentioned electronic musical instrument will be explained based on various key operation examples with reference to the operation chart of the state control circuit 17 shown in FIG.

In addition, in the following explanation, the gate circuit 18 (FIG. 5)
The explanation will be made assuming that it is always open.

First, at time t shown in FIG. 7(a), the key Ga
(3rd octave G note key) is turned on, and time t
The operation when the key G is turned off at time t will be explained.

First, when the power is turned on, the DFF 21 (FIG. 5) is reset, and the state control circuit 17 advances to step SP shown in FIG. Outputs state data ST indicating (key-off state). This state data ST is the state, IjlJ control circuit 17
When the rate data RD "αoJ (=0)" corresponding to the timbre data TD is output from the envelope plate memory 16, it is supplied to the arithmetic circuit 20 via the gate circuit 18. The arithmetic circuit 20 receives rate data RD “0” and D
The output data "0" of the I"F 21 is added, and the addition result "0" is supplied to the input terminal of the DFF 21. DFF
21 reads the addition result "0" based on the clock pulse signal and outputs it as envelope data ED. Thereafter, data 17 D J is read into the DFF 21 every time the clock pulse signal is supplied, and therefore the envelope data ED continues to be in the "0" state. This state continues until the rate data RD changes to a value other than "0".

Further, when state data ST indicating state S0 is output from the state control circuit 17, S.

A signal 5So (“1” signal) is output from the detection circuit 26 and supplied to the inverter 8. As a result, a "0" signal is output from the inverter 8, and the AND gate 6 is closed.

Next, when key G of keyboard 1 is turned on at time t1, key code MKC (key code KC of key G3 in this case) and key-on signal K are sent from the highest note detection circuit 3.
ONI ("1' signal) is output, key code MKC is supplied to latch circuit 4, key-on signal KONI is supplied to differentiation circuit 5 and key-on time correction circuit 11, respectively. Key-on signal KON1 is supplied to differentiation circuit 5. Then, the key-on pulse KONP ("1'" signal) is output from the differentiating circuit 5, and the latch circuit 4, AND gate 6 and EG
The signal is supplied to the state control circuit 17 of No. 7.

When the key-on pulse KONP is supplied to the latch circuit 4, the key code MKC is read into the latch circuit 4 and output to the latch circuit 25. The key-on pulse KoNP supplied to the AND gate 6 is not supplied to the one-shot circuit 9 because the AND gate 6 is in the closed state at this time. That is, the key-on signal KON2 is not inputted from the one-shot circuit 9, and therefore, ONI is directly outputted to the EG7 as the key-on signal KON. When the key-on pulse KONP is supplied to the state control circuit 17 of EG7,
This key-on pulse KONF step 7'5P2 (6th
), and the process proceeds to step SP. At step SP, an attack pulse AP is output to the latch circuit 25. As a result, the key code MKC in the latch circuit 4 (the key code KC of the key G3) is changed to the latch circuit 25.
and supplied to the musical tone signal forming section 14. next,
Proceeding to step SF3, state data ST indicating state St (attack state) is output from state control circuit 17. And this state data S
When T is supplied to the envelope plate memory 16 and the envelope level memory 22, the envelope plate memory 16 outputs rate data RDrα,
The level data LD is supplied to the input terminal A of the arithmetic circuit 20 via the gate circuit 18, and the level data LD is outputted from the envelope level memory 22 and supplied to the input terminal A of the comparator circuit 230. When the rate data RDrα, ” is supplied to the input terminal A of the arithmetic circuit 20, since the envelope data ED is “0” at this time, the arithmetic circuit 20 outputs the data “α, +0−α,”. . This data “α1
'' is read into the DFF 21 by the clock/gurusu door, and is supplied as envelope data ED to the musical tone signal forming section 14, as well as to the input terminal B of the arithmetic circuit 200A.

Envelope data EDr to arithmetic circuit 200Å power terminal B
When the data “α,” is supplied, the arithmetic circuit 20 outputs the data “α1
+α,=2α1” is output, and this data “2α,” is read into the DFF 21 by the next clock pulse and is output as envelope data E I). Hereinafter, the envelope data E that increases sequentially from the DFF 21 every time the clock pulse is fed to the DFF 21 as a fin.
Dr3α1”, “4α1”, . . . are sequentially output and supplied to the musical tone signal forming section 14 (attack state S1). When this envelope data ED becomes the same data (1"nα1") as the level data LD output from the envelope level memory 22, a coincidence signal EQ ("'1" signal) is sent from the ratio axis circuit 23. The signal is output and supplied to the state control circuit 17.

On the other hand, the state control circuit 17 performs the step SP described above.
After the process in step 4, steps SP5 to SP? The judgment is made repeatedly. That is, step SP.

Then, whether or not the key-on pulse KONF rose to the "1" signal (that is, whether the key code MKC changed during the attack state), the key-on signal KON fell to the "0" signal at step SP6. Whether or not (
In other words, the key is Nu during the attack state.
), step SP? Then, the coincidence signal EQ is
1" signal has risen. Then, when the determination result in step SP7 is rYEsJ, the process advances to step SPs. Note that if the determination result in step SP is rYEsJ, is step SP
The process proceeds to step SP6, and the judgment result in step SP6 is r.
If YES, proceed to step S P1o. In step S Pa, state data ST indicating state S2 (sustain state) is output. Next, when the process advances to step SP, the tone color and data TD are changed to a sustain tone (sustain state S2 as shown in FIG. 1 (c)).
It is determined whether the timbre data is of a musical tone having a . If the result of this judgment is "YES", the process advances to step S PH1 [r.

On the other hand, if the determination result is rNOJ, that is, if the timbre data TD is the timbre data of a percussive musical tone, the process proceeds to step 5P1o, and state data ST indicating a decay state is output.

That is, if the tone color data TD is tone color data of a percussive musical tone (well, stay), the state data ST indicating S2 is output only for a very short time. In other words, in the case of percussive musical tones, it is essentially state S.

State data ST indicating this is never output.

Now, if the timbre data TD is the timbre data of a sustained sound,
After the state data ST indicating the state S is output, the envelope data ED whose value does not change becomes D.
It is continuously output from the FF21. That is, state data ST indicating state S2 is transmitted to state control circuit 17.
When the rate data RDrα2J (=O) is outputted from the envelope plate memory 16 and supplied to the input terminal A of the arithmetic circuit 20 via the gate circuit 18. As a result, the data "n" held in the DFF21 at this point
α1'' is thereafter continuously output as envelope data ED (sustain stay) S2). On the other hand, while this envelope data EDrnα1 is being output from the DFF 21, the state control circuit 17 is in step 5P.
12. Repeat the judgment lth of SP+s. That is, S
At P1□, check whether the key-on pulse K ON P has risen to a "1" signal (whether the key code MKC has changed or not)
, in step SP+s, the key-on signal KON-hi"o
”A judgment is made as to whether the signal has fallen (key-off or not).Then, the judgment result at step SP is rY.
When it becomes ESJ, proceed to step 5P12 and enter state S.
State data ST indicating 3 is output. Note that if the determination result in step 5P12 is rYEsJ, the process advances to step SP.

When the state control circuit 17 outputs the state data ST shown in step 53fr, the envelope plate memory 16 and the envelope level memory 22 output rate data RD rα3 and data 0, respectively, and the E31 circuit 20 Thereafter, it operates as a subtraction circuit. Rate data RD “α” from envelope plate memory 16
3” is output, and the arithmetic port P12 is outputted via the gate circuit 18.
0, the envelope data ED is "nα," at this point, so the arithmetic circuit 2
Data "nα1-03" is output from 0. and,
This data "nα1-αs'J is inputted into the rlFF21, and the musical tone signal forming section 1 inputs it as envelope data ED.
4 and is also supplied to the input terminal B of the arithmetic circuit 20. Data “nα” is input to the input terminal B of the Enkasa circuit 20.
1-α3'' is supplied, the arithmetic circuit 20 outputs the data ``nα, -α, -α, = nα1 2α3J,
DFF21km is read and output from DFF21 as envelope data ED. Below, the envelope shifters ED lz+ "t" α3, "
nα, -4α3”... is output from the DFF 21 (decay stage) S,). And time t. In (Figure 7 (b)), the envelope data ED is "0"
Then, a match signal EQ (“′1” signal) is outputted from the comparison circuit 23 and supplied to the state control circuit 17.

On the other hand, during this decay state S3, the state control circuit 17 repeatedly makes judgments in steps sp, . . . SPl. That is, in step SPl, the key-on pulse K
Step sp1. Now match signal EQ
A judgment is made as to whether or not the signal has risen to 1".Then,
The coincidence signal EQ rises to "1" signal, steps sp, s
When the determination result in is rY E S J, the process returns to step SP described above. In addition, step SP
If the determination result in step SP9 is rYEsJ, the process advances to step SP9.

In this way, when key G is turned on at time t1 shown in FIG. Code KC is key-on pulse KONP
The data is read into the latch circuit 4 by the latch circuit 4. Next, the key code MKC in the latch circuit 4 is read into the latch circuit 25 by the attack pulse AP, and the key code MKC in the latch circuit 4 is read into the latch circuit 25 by the attack pulse AP.
supplied to On the other hand, EG7G ma key on pulse KON
After the time when F is supplied, the envelope data ED shown in FIG.
Output. The musical tone signal forming section 14 forms a musical tone signal having a pitch corresponding to the key code MKC of the key Gs supplied from the latch circuit 25 and a tone color corresponding to the tone data TD, and converts this musical tone signal into a musical tone signal. An envelope corresponding to the envelope data ED supplied from the EG 7 is added to the envelope data ED, and the resulting data is output to the sound system 28. As a result, the sound system 28 produces the musical tone of the key G3.

The above is the operation of this electronic musical instrument when only key G3 is operated.

Next, the musical tone in the key G is decay state S.

The operation in the case where the key G and the higher-pitched key C6 are turned on for a very short time (shorter than the above-mentioned predetermined time T) as shown in FIG. 7(C) will be described below. First, when the key C4 is turned on at time t3 shown in FIG.
The key food KC of key C4 is output as C (see Fig. 7)), and the key-on signal KONI rises to 1'' signal (see Fig. 7 (e)).Key-on signal K ON
1 rises to the 71' signal, the key-on pulse KONP (Fig. 7 (→)) is output from the differentiating circuit 5. As a result, the key code KC of the key C4 is read in the rough 4th N4 (@71J (Male).At this time, latch circuit 2
5 holds the key code KC of key G3 (719th)
The state data ST indicating the status S3 is output from the control circuit 17, and therefore the signal SSo is ``''
It is in the state of 0" signal, and the output of inverter 8 is "1"1
As a result, the key-on pulse KONP is supplied to the one-shot circuit 9 via the AND gate 6, and the one-shot circuit 9 outputs the key-on signal K with a pulse width T.
ON2 (@Figure 7 (G)) is output. This results in
The pulse width of the key-on signal KONI is expanded. That is, the key-on signal KON with a pulse width T is applied to the OR gate 10.
(Figure 7 ←)) Also, the time t mentioned above
, slightly before, the tone of key G is in decay state S3, and therefore, in state 11, the control circuit 17 repeatedly makes the determinations of steps S'P, 4, and SF3 shown in FIG. Therefore, when the key-on pulse K ON P is output from the differentiating circuit 5 at time t, this key-on pulse K ON P is outputted from step 5.
(detected by P14 and stays) i1d control circuit 1
Step 7 proceeds to step S P o. Step SP,
In this case, state data ST shown in step S4 (dump state)'f is output. As a result, the envelope plate memory 16 outputs the rate data RDrα4, which is supplied to the arithmetic circuit 20 via the gate circuit 18, and the envelope level memory 22 outputs the rate data RDrα4.
0'' is output and supplied to the comparison circuit 23.

Here, rate data RDrα4' is rate data RD
rα,” is set to a larger value.

In addition, the arithmetic circuit 20 receives the state data ST (S)
, it operates as a subtraction circuit. Therefore, from then on, the value of the envelope data ED rapidly attenuates as shown in FIG. 7(a) (dump state S
4)o and time t1. (FIG. 7(b)), when the envelope data ED reaches "0", the comparison circuit 23 outputs the match signal EQ, and the state control circuit 1
7. This coincidence signal EQ (“1” signal) is detected at step SP+a, and the state control circuit 1
The process of step 7 proceeds to step S P s. Step SP8
Then, the attack pulse AP is output to the latch circuit 25 (FIG. 7(g)). As a result, the key code KC of the key C4 in the latch circuit 4 is read into the latch circuit 25,
The signal is output to the musical tone signal forming section 14 (see figure 7).

Thereafter, similarly to the case described above, the envelope data ED is sequentially outputted from the EG7, is filtered (see FIG. 7A), and is supplied to the musical tone signal form section 14. Musical tone signal, forming section 1
4 forms a musical tone signal for key C4 and outputs it to the sound pure system 28. As a result, a musical tone of -+-C4 is produced.

In the above process, time t4 when key c4 is turned off
is before time tb, the musical tone of key c4 is not produced at all in the conventional electronic musical instrument. However, in the electronic musical instrument according to this embodiment, the key-on signal K ON
Since the pulse width of 1 is expanded to T, and therefore the key-on time of key c4 is treated as T, key c4
Can fully pronounce musical tones. Here, the setting of the time gT, that is, the setting of the time constant of the one-shot circuit 9, is the sum of the time of the dump state S4 and the time of the attack state s1, as is clear from @7 (see also Figure 7(A)). You can set it to a slightly longer time.

Next, in FIG. 8, the key C4 is turned off immediately after the key G3 is turned off.
This is a waveform diagram of output signals from various parts of the circuit when key E4, which is on the higher pitch side than key c4, is turned on for a short time immediately after key c4 is turned on for a very short time. In this case, as shown in the same figure), when the key G is turned off, the envelope data ED first goes into the decay state ss, and then when the key C2 is turned on, it goes into the dump state S. If the key C2 is turned off while the envelope data ED is in this dump state S4, and then the key E4 is turned on, when the dump state S4 of the key G3 ends and the attack noggle AP is output, Latch circuit 4 has Φ-E4 key hood K.
C is stored, and therefore, after the musical tone generation of the key G3 ends, the musical tone generation of the key E4 is performed. That is, in the case shown in this figure, musical tone generation by key C4 is not performed.

In addition, in FIG. 8 (g), the key-on signal K ON 2
The reason why the pulse width of is longer than time T is that the one-shot circuit 9 is retriggered.Next, FIG. 9 shows that while key G is turned on, key C4 is turned on. On and off], (time t1), turned off (time t2), turned on again (time tB), and while key C4 is turned on, key G.

This is the case when the switch is turned off (time t4). in this case,
The musical sound generation state is based on the envelope data E shown in 00 in the same figure.
As is clear from the waveform of key G, first the musical tone of key G3 is dumped, then the musical tone of key C4 is generated, then the musical tone of key C4 is dumped, then the musical tone of key G is generated, and then the musical tone of key G is generated. The musical tone of G is dumped, and then the system layer generation of key C4 is performed.

Next, FIG. 10 shows a case where the key C4 is turned off and turned off while the key G is turned on, and immediately after being turned off, the key C4 is turned on again. In this case, When the off time to of key C4 is shorter than the dump time of the musical tone of key C4, the musical tone of key C4 occurs again after the dump state S4 of the musical tone of key C1 ends, as is clear from (4) in the same figure. Finally, the operation timing generation circuit 19 shown in FIG. 5 will be explained. This calculation timing generation circuit 19 is a circuit for controlling the slope of the envelope waveform. For example, in actuating state S1, rate data RD
The calculation circuit 2 calculates “α,” once every two periods of the clock pulse φ.
By supplying the signal to 0, the slope of the attack state S1 can be set to %. Similarly, if it is supplied once every three cycles, the slope can be made to be lunar.

The calculation timing generation circuit 19 generates a timing pulse TP for controlling the full opening and closing of the gate circuit 18 based on the clock pulse signal and the tone data TD, thereby controlling the slope of each state of the envelope waveform.

The reason why the AND gate 6 shown in FIG. 3 is inserted is that when a new key is pressed from the state where all keys are off (state So), the key-on pulse KO
This is to produce sound at the same length without enlarging N1.

The above are details of one embodiment of the present invention shown in FIGS. 3 and 5.

Note that in the above-mentioned embodiment, if the time for which sound should be produced is extremely short, sound may not be produced (see Figures 8 and 10), but it is also possible to configure the system so that all musical tones that should be produced are produced. It is.

In this case, a new key code MK is input from the highest note detection circuit 3.
Each time C is output, it may be sequentially stored in the memory, and each time the dump state ends, the previously stored key code MKC may be read and supplied to the tone signal forming section 14. In this case, when another key code MKC is stored in the memory, musical tone 5 is always dumped.

Further, although the above-described embodiment is a single-note electronic musical instrument that uses the highest tone priority method, it is of course possible to apply the present invention to a multiple-tone electronic musical instrument that uses a pronunciation assignment method, or a single-note electronic musical instrument that uses a later note priority method, etc. .

In addition, in the above-mentioned example, the key-on signal KOH causes the EG
However, this invention generates an event pulse in response to key-on and key-off, and controls the EG with this event pulse, as is done in electronic musical instruments using a microcomputer. It is also applicable to

Further, in the above embodiment, the timing of moving from the dump state S4 to the attack state S1 is the time when the envelope data ED reaches rOJ. - When the value of the data ED is one predetermined value from the start of dumping, the transition may be made to the completed tuck state S1.

Furthermore, the slope of the dump state S4 or the above-mentioned predetermined time T may be changed depending on the tone color data TD.

As detailed above, according to the present invention, when the sounding time of a key with a high priority is shorter than the predetermined time T, the sounding time of the key is regarded as the above-mentioned predetermined time or a longer time. Therefore, even if the sound generation time of a high-priority key is short, there is an advantage that the musical tones of the same key can be sufficiently produced within a range that is not unnatural.

[Brief explanation of the drawing]

1 and 2 are waveform diagrams for explaining the drawbacks of conventional electronic musical instruments, FIG. 3 is a block diagram showing the configuration of one embodiment of the present invention, and FIG. 4 is a key-on diagram in the same embodiment. A waveform diagram for explaining the function of the time correction circuit 110, FIG. 5 is a block diagram showing details of EG7 in the same embodiment, and FIG.
The operational flowcharts of FIGS. 7 to 10 are waveform diagrams for explaining the operations of the same implementation. 3...Top sound detection circuit, 4...Latch circuit, 5...Differential circuit, 7...Envelope generator, 9...One shot circuit, 10...
...Or Kate, 14...Musical tone number seconds formation part,
25...Latch circuit. Figure 8 Figure 9 (a) G3 4

Claims (1)

[Claims] In an electronic musical instrument configured to, when a musical tone of another key is to be generated in place of the musical tone currently being generated, the musical tone that is currently being generated is rapidly attenuated and then the musical tone of the other key is generated; When the time during which the musical tones of the other key should be produced is shorter than a predetermined time, the time during which the musical tones of the other key should be produced is regarded as the predetermined time or a longer time and is produced. Features: A method for controlling sound production in electronic musical instruments.