JPH0362277B2 - - Google Patents

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, in a single-note electronic musical instrument (number of sounding channels = 1), immediately after a certain key is released,
In other words, if the next key is pressed while the musical tone of the same key is still in the decay state (attenuation state), the musical tone in the decay state will be dumped (rapidly attenuated) and the musical tone of the next key will be produced. let Also,
If a key with a higher priority is pressed while a certain key is being pressed, the musical tone of the currently pressed key is dumped, and then the musical tone of the other key with a higher priority is produced. let In addition, in electronic musical instruments that use the sound assignment method, when a new key is pressed when all of the multiple sound channels have been assigned sounds, the musical sound that is in the decay state among the musical sounds that are being sounded is dumped, and that sound channel is Assigns the newly pressed key to the key and produces a musical tone. In this way, in electronic instruments with a limited number of sounding channels, when a key with a higher priority is pressed, one of the musical tones currently being sounded is dumped and the musical sound of the key with a higher priority is played. let

By the way, in such conventional electronic musical instruments, when the pressing time of a new key (time to produce a sound) is very short, even though musical sound should be generated with priority, the same A situation arises in which the musical tones of the keys are not sufficiently produced and are distorted. For example, Fig. 1A shows the key press time of a certain key K1 in a single-note electronic musical instrument, Fig. 1B shows the key press time of key K2, which has a higher priority than key K1, and Fig. 1C shows the key press time of a certain key K1 in a single-note electronic musical instrument. The envelope waveform of the K1 musical tone is shown. Note that symbols S ₀ to _{S 4} in FIG.
As shown in FIG. 1, the key K2 is the key K1
If the key is released while the musical tone of key K2 is in the dump state _S4 , the musical tone of key K2 will not be produced at all. Also,
In FIG. 2, A to C are waveforms corresponding to A to C in FIG. 1, respectively, and D is an envelope waveform of the musical tone of key K2. Note that this diagram shows a case where the set tone is a percussive type tone, that is, the decay state is activated immediately after the attack state _S1 ends.
This is the case for musical tones transitioning to _S3 . In the case of the example shown in FIG. 2, the musical tone of key K2 enters the decay state _S3 in the middle of the attack state _S1 , and as a result, the musical tone of key K2 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 a high-priority key within a range that is not unnatural even when the sound production time of a high-priority key is very short. A musical tone control method for an electronic musical instrument according to the present invention includes an electronic musical instrument configured to generate a musical tone corresponding to a desired key in response to a musical tone generation command that instructs generation of a musical tone corresponding to a desired key. When a new musical sound generation command is given to a musical instrument, (a) if it is not currently generating a musical sound, it shall generate a new musical sound in accordance with the musical sound generation time specified by the musical sound generation command; (b) If a musical tone is currently being generated, the currently generated musical tone is rapidly attenuated, and a new musical tone is generated even if the musical tone generation time specified by the musical tone generation command is shorter than the predetermined time. The present invention is characterized in that the new musical tone is generated by regarding the time to be generated as longer than the time required for at least the rapid attenuation.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 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, numeral 1 is a keyboard;
Each key on the keyboard 1 is provided with a key switch for detecting key operations. Key press detection circuit 2
detects the on/off state of each key by sequentially scanning the output of each key switch on keyboard 1,
The key codes KC of the keys in the on state are output in sequence. Note that the key code KC is set so that the higher the pitch of the key, the greater its value.

The highest note detection circuit 3 sequentially compares the key codes KC output from the pressed key detection circuit 2 with each other to find the key code KC with the largest value (that is, the highest note key among the pressed keys). Detects the key code KC), outputs the detected key code KC as the key code MKC to the latch circuit 4,
Further, while outputting the key code MKC, a key-on signal KON1 (“1” signal) is outputted to the differentiating circuit 5. In this case, if the key code MKC does not become "0" at once, but changes continuously, the key-on signal KON1 becomes a "0" signal for a very short time at the time of change, and returns to a "1" signal again (9th
(See Figures I to D and Figure 10 A to D).

The differentiator circuit 5 is a circuit that generates a narrow key-on pulse KONP at the rising edge of the key-on signal KON1, and the generated key-on pulse KONP
is the load terminal L of the latch circuit 4, and the AND gate 6
and an envelope generator (hereinafter abbreviated as EG) 7. AND gate 6 is a gate whose opening and closing are controlled by a signal obtained by inverting signal SS ₀ outputted from EG 7 by inverter 8 , and its output is supplied to one shot circuit 9 . The one-shot circuit 9 receives a key-on pulse supplied via the AND gate 6.
This circuit is triggered by KONP and outputs a "1" signal for a predetermined time T, and 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 takes the OR of the key-on signal KON2 and the key-on signal KON1,
The output signal is supplied to the EG7 as a key-on signal KON. Therefore, the above-mentioned component 6,
8, 9, and 10 constitute a 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. FIGS. 4A to 4D are waveform diagrams showing the key-on signal KON1, key-on pulse KONP, key-on signal KON2, and key-on signal KON, respectively. As shown in these figures, when the pulse width of the key-on signal KON1 is larger than the pulse width T (predetermined time described above) of the key-on signal KON2, the pulse widths of the key-on signal KON and the key-on signal KON1 are the same,
On the other hand, if the pulse width of the key-on signal KON1 is smaller than the pulse width T of the key-on signal KON2, then the pulse width of the key-on signal KON is smaller than the pulse width T of the key-on signal KON2.
It becomes the same as the pulse width T of 2. That is, when the pulse width of the key-on signal KON1 is greater than the predetermined time T, the key-on time correction circuit 11 outputs the key-on signal KON1 as it is as the key-on signal KON; If small, key-on signal
The pulse width of KON1 is expanded and output as a key-on signal KON with pulse width T.

Next, the timbre selection circuit 13 includes a plurality of timbre switches and an encoder for selecting timbres, and encodes the output of the timbre switch that is turned on, and outputs it as timbre data TD to the musical tone signal forming section 14. and output to EG7.

EG7 uses key-on signal KON, key-on pulse
Based on the tone color data TD outputted from KONP and the tone color selection circuit 13, envelope data ED whose value changes sequentially as shown in FIG. 1C or FIG. The details are shown in FIG. In FIG. 5, the envelope plate memory 16 stores a data group consisting of five types of rate data RD "α ₀ " to "α ₄ " corresponding to each state (hereinafter referred to as "state") S ₀ to S ₄ of the envelope waveform. is a memory stored in correspondence with each tone color data TD, each data group is specified by the tone color data TD, and each rate data RD in the specified data group is outputted from the state control circuit 17. It is read out according to the state data ST. In addition, the rate data BD “α ₀ ” and “α ₂ ” mentioned above
The value of is 0 in all data groups. The gate circuit 18 is a gate circuit whose opening/closing is controlled by the timing signal TP output from the calculation timing generation circuit 19, and outputs the rate data RD to the calculation circuit 20 when it is in the open state, and outputs the rate data RD to the calculation circuit 20 when it is in the closed state. Outputs data “0”. The calculation timing generation circuit 19 receives clock pulse φ and tone data.
Based on TD, a timing signal TP which is synchronized with the clock pulse φ and different for each tone is generated and outputted to the gate circuit 18. Note that this circuit 19 will be explained in detail later.

The arithmetic circuit 20 is a circuit that adds or subtracts data supplied to its input terminal A and data supplied to its input terminal B, and indicates one of states S ₀ to S ₂ to its control terminal C. When state data ST is supplied, input terminal A,
On the other hand, if state data ST indicating state S ₃ or S ₄ is supplied to control terminal C, the data at input terminal A is subtracted from the data at input terminal B. Output. A delay flip-flop (hereinafter abbreviated as DFF) 21 reads the output data of the arithmetic circuit 20 every time a clock pulse φ is supplied, and uses the read data as envelope data ED in the tone signal forming section 14 (third Output to (Figure).

On the other hand, the envelope level memory 22 is a memory in which level data LD corresponding to each timbre data TD is stored, and when state data ST indicating states S ₀ , S ₂ to _{S 4} are supplied, data " If state data ST indicating state S ₁ is supplied, tone data
Level data LD having a value corresponding to TD is output to the comparison circuit 23. Comparison circuit 23 is level data
LD and envelope data ED are compared, and if they match, a match signal EQ (“1” signal) is output to the state control circuit 17. The state control circuit 17 creates state data ST based on the coincidence signal EQ, key-on signal KON, etc., and outputs it to each part of the circuit, and also outputs the attack pulse AP to the load terminal L of the latch circuit 25 (FIG. 3). . Note that details of this state control circuit 17 will be explained later. The S ₀ detection circuit 26 is connected to the state control circuit 17
This is a circuit that detects when state data ST indicating state S ₀ is output from , and outputs a signal SS ₀ (“1” signal), and the output signal SS ₀ is sent to the inverter 8 (Figure 3). Supplied to the input end.

Next, the latch circuit 25 shown in FIG. 3 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 is
Key code MKC supplied from latch circuit 25,
Tone data supplied from the tone selection circuit 13
Envelope data supplied from TD and EG7
A musical tone signal is formed based on the ED and output to the sound system 28. The sound system 28 generates musical sounds based on the supplied musical tone signals.

Next, the operation of the electronic musical instrument described above will be explained based on various key operation examples with reference to the operation flowchart of the state control circuit 17 shown in FIG.
In the following description, it is assumed that the gate circuit 18 (FIG. 5) is always open.

First, at time t ₁ shown in FIG. 7A, key G _{3 is} pressed.
(3rd octave G note key) only is turned on,
The operation when the key _G3 is turned off at time _t2 will be explained.

First, when the power is turned on, DFF21 (fifth
) is reset, and the state control circuit 1
7 proceeds to step _SP1 shown in FIG. 6, and outputs state data ST indicating state _S0 (key-off state). When this state data ST is output from the state control circuit 17 and supplied to the envelope plate memory 16, the rate data RD "α ₀ " (=0) corresponding to the tone data TD is output from the envelope plate memory 16, and the gate It is supplied to the arithmetic circuit 20 via the circuit 18.
The arithmetic circuit 20 outputs the rate data RD “0” and the DFF
21, and the addition result "0" is supplied to the input end of the DFF 21. DFF
21 reads the addition result "0" based on the clock pulse φ and outputs it as envelope data ED. Thereafter, data "0" is read into the DFF 21 every time the clock pulse φ is supplied, and therefore the envelope data ED continues to be "0". This state continues until the rate data RD changes to a value other than "0".

Further, when the state control circuit 17 outputs the state data ST indicating the state S ₀ , the S ₀ detection circuit 26 outputs the signal SS ₀ (“1” signal),
It is 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 ₃ of keyboard 1 is turned on at time t ₁ , the key code is sent from the highest note detection circuit 3.
MKC (in this case, key code KC of key G ₃ ) and key-on signal KON1 (“1” signal) are output, key code MKC goes to latch circuit 4, and key-on signal KON1 goes to differentiation circuit 5 and key-on time correction circuit 11. Each is supplied. key on signal
When KON1 is supplied to the differentiator circuit 5, the key-on pulse KONP (“1” signal) is output from the differentiator circuit 5, and the latch circuit 4, AND gate 6 and
It is supplied to the state control circuit 17 of EG7. 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, in this case, the key-on signal KON2 is output from the one-shot circuit 9.
is not output, therefore, the key-on signal KON1 is used as the key-on signal KON.
Output to EG7. EG7 state control circuit 1
When the key-on pulse KONP is supplied to step 7, this key-on pulse KONP goes to step SP ₂ (Figure 6)
is detected by , and the process proceeds to step _SP3 . At step SP ₃ , the attack pulse AP is connected to the latch circuit 2.
5. As a result, the key code MKC (key code KC of key G ₃ ) in the latch circuit 4 is read into the latch circuit 25 and supplied to the tone signal forming section 14 . Next, when the process advances to step _SP4 , state data ST indicating state _S1 (attack state) is output from state control circuit 17.
Then, when this state data ST is supplied to the envelope plate memory 16 and the envelope level memory 22, the rate data RD "α ₁ " is output from the envelope plate memory 16,
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 23 . When the rate data RD "α ₁ " is supplied to the input terminal A of the arithmetic circuit 20, since the envelope data ED is "0" at this time, the data "α ₁ +0" is supplied from the arithmetic circuit 20.
= α ₁ ” is output. This data "α ₁ " is read into the DFF 21 by the clock pulse φ, and is supplied to the tone signal forming section 14 as envelope data ED, as well as to the input terminal B of the arithmetic circuit 20. When the envelope data ED "α ₁ " is supplied to the input terminal B of the arithmetic circuit 20, the arithmetic circuit 20 outputs the data "α ₁ +α ₁ = 2α ₁ ", and this data "2α ₁ " is used as the next clock pulse φ. The envelope data ED is read into DFF21 by
is output as Below, the clock pulse φ is
Envelope data ED "3α ₁ ""4α ₁ " increases sequentially from DFF 21 every time it is supplied to DFF 21...
... are sequentially output and supplied to the musical tone signal forming section 14 (attack state S ₁ ). When this envelope data ED becomes the same data "nα ₁ " as the level data LD output from the envelope level memory 22, the comparator circuit 2
A match signal EQ (“1” signal) is outputted from 3 and supplied to the state control circuit 17.

On the other hand, the state control circuit 17 repeatedly performs the determinations in steps _SP5 to _SP7 after the process in step _SP4 described above. That is, in step _SP5 , it is determined whether the key-on pulse KONP has risen to a "1" signal (that is, whether the key code MKC has changed during the attack state).
In SP ₆ , the step determines whether the key-on signal KON has fallen to a "0" signal (that is, whether the key has been released in the middle of the attack state).
At _SP7 , it is determined whether the coincidence signal EQ has risen to a "1" signal. If the judgment result in step _SP7 becomes "YES", the process advances to step _SP8 . Note that if the determination result in step _SP5 is "YES", the process advances to step _SP9 , and if the determination result in step _SP6 is "YES", the process advances to step _SP10 . At step _SP8 , state data ST indicating state _S2 (sustain state) is output. Next, in step _SP11 , it is determined whether the tone color data TD is tone color data of a sustained tone (a musical tone having a sustain state _S2 as shown in FIG. 1C). If the result of this judgment is "YES", the process advances to step _SP12 . On the other hand, if the judgment result is "NO", that is, if the tone data TD is tone data of a percussive musical sound, proceed to step _SP10 .
State data ST indicating state S ₃ (decay state) is output. In other words, the timbre data
If TD is timbre data of a percussive musical tone, state data ST indicating state _S2 is output only for a very short time. In other words,
In the case of percussive musical tones, it is essentially state S ₂ .
State data ST indicating this is never output.

Now, when the tone color data TD is tone color data of a sustained tone, envelope data ED whose value does not change is continuously outputted from the DFF 21 after the time point when the state data ST indicating state _S2 is outputted. i.e. state data indicating state S ₂
When ST is output from the state control circuit 17 and supplied to the envelope plate memory 16, the rate data RD is output from the envelope plate memory 16.
“α ₂ ” (=0) is output and supplied to the input terminal A of the arithmetic circuit 20 via the gate circuit 18 . As a result, the data "nα ₁ " held in the DFF 21 at this point is continuously output as envelope data ED (sustain state S ₂ ).
On the other hand, this envelope data ED “nα ₁ ” is DFF
21, the state control circuit 1
Step 7 repeats the judgments in steps SP ₁₂ and SP ₁₃ .
That is, at step SP ₁₂ , it is determined whether the key-on pulse KONP has risen to a "1" signal (or whether the key code MKC has changed or not), and at step SP ₁₃ , it is determined whether the key-on signal KON has fallen to a "0" signal. (key-off or not) is determined. And the steps
When the determination result at _SP13 becomes "YES", the process advances to step _SP12 , and state data ST indicating state _S3 is output. In addition, if the judgment result in step SP ₁₂ is "YES", step
Proceed to SP ₉ .

When the state control circuit 17 outputs the state data ST indicating step _S3 , the envelope plate memory 16 and the envelope level memory 2
From 2, rate data RD “α ₃ ” and data “0” respectively.
is output, and the arithmetic circuit 20 thereafter operates as a subtraction circuit. envelope plate memory 16
When the rate data RD "α ₃ " is outputted from the gate circuit 18 and supplied to the input terminal A of the arithmetic circuit 20, at this point the envelope data ED
is “nα ₁ ”, the arithmetic circuit 20 outputs data “nα ₁ −α ₃ ”. Then, this data “nα ₁ −α ₃ ” is read into the DFF 21 and output as envelope data ED to the tone signal forming section 14 and also supplied to the input terminal B of the arithmetic circuit 20. When the data "nα ₁ - α ₃ " is supplied to the input terminal B of the arithmetic circuit 20, the data "nα ₁ - _{α 2} - α ₃ = nα ₁ -2α ₃ " is outputted from the arithmetic circuit 20.
The data is read into the DFF 21 and output from the DFF 21 as envelope data ED. Below, the envelope data ED "nα ₁ −3α ₃ ", "nα ₁ −
4α ₃ ”... is output from the DFF 21 (decay state S ₃ ). Then, when the envelope data ED becomes "0" at time te (FIG. 7B), a match signal EQ ("1" signal) is output 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 the determinations in steps _SP14 and _SP15 . That is, in step _SP14 , it is determined whether the key-on pulse KON rises to a "1" signal (whether or not the key code MKC has changed).
At _SP15 , it is determined whether the coincidence signal EQ has risen to a "1" signal. Then, the match signal EQ is “1”
When the signal rises and the judgment result in step SP ₁₅ becomes "YES", the above-mentioned step SP ₁ is carried out again.
Return to Incidentally, if the judgment result in step _SP14 is "YES", the process advances to step _SP9 .

In this way, when the key G ₃ is turned on at time t ₁ shown in FIG.
Keycode of key G ₃ as keycode MKC from
KC is output, and this key code KC is read into the latch circuit 4 by the key-on pulse KONP.
Next, the key code MKC in this latch circuit 4
is read into the latch circuit 25 by the attack pulse AP and supplied to the musical tone signal forming section 14. On the other hand, EG7 generates the envelope data shown in Figure 7B after the key-on pulse KONP is supplied.
An ED is created and sequentially output to the musical tone signal forming section 14. The musical tone signal forming section 14 forms a musical tone signal having a pitch corresponding to the key code MKC of key _G3 supplied from the latch circuit 25 and a tone color corresponding to the tone data TD, and applies E.G.
Sound system 2 adds an envelope corresponding to the envelope data ED supplied from 7.
Output to 8. This allows sound system 2
The musical tone of key G ₃ is sounded from 8.

The above is the operation of this electronic musical instrument when only key _G3 is operated.

Next, when the musical tone of key G ₃ is in Decay state S ₃ , key C ₄ , which is higher than key G ₃ , is activated for an extremely short period of time (predetermined time T as described above) as shown in FIG. 7C.
(for a shorter period of time) will be explained below. First, when _key C ₄ is turned on at time t ₃ shown in FIG.
KC is output (see FIG. 7D), and the key-on signal KON1 rises to a "1" signal (see FIG. 7E). When the key-on signal KON1 rises to the “1” signal, the key-on pulse KONP (7th
Figure F) is output. As a result, the latch circuit 4
The key code KC for key _C4 is read (see Figure 7). At this time, the latch circuit 25 has the key G ₃
The key code KC is held (Fig. 7).
Also, at this point, the state control circuit 17 is outputting the state data ST indicating state _S3 , so the signal _SS0 is in the "0" state, and the output of the inverter 8 is "1". It is in a signal state. This results in a key-on pulse
KONP is supplied to the one-shot circuit 9 through the AND gate 6, and the one-shot circuit 9 outputs a key-on signal KON2 (FIG. 7) having a pulse width T. As a result, the pulse width of the key-on signal KON1 is expanded. That is, a key-on signal KON having a pulse width T is outputted from the OR gate 10 (FIG. 7H). Also, slightly before the aforementioned time _t3 , the musical tone of key _G3 is in decay state _S3 , and therefore the state control circuit 17 makes the determinations in steps _SP14 and _SP15 shown in FIG. I've been there repeatedly. Therefore, when the key-on pulse KONP is output from the differentiating circuit 5 at time _t3 , this key-on pulse KONP is detected at step _SP14 , and the state control circuit 1
7 proceeds to step _SP9 . At step _SP9 , state data ST indicating state _S4 (dump state) is output. As a result, the rate data RD is stored in the envelope plate memory 16.
“α ₄ ” is outputted and supplied to the arithmetic circuit 20 via the gate circuit 18 , and data “0” is outputted from the envelope level memory 22 and supplied to the comparison circuit 23 . Here, rate data RD
“α ₄ ” is set to a value larger than the rate data RD “α ₃ ”. Further, the arithmetic circuit 20 operates as a subtraction circuit when the state data ST indicates state _S4 . Therefore, thereafter, the value of the envelope data ED rapidly attenuates as shown in FIG. 7E (dump state S ₄ ). and,
Envelope data at time tb (Fig. 7 O)
When ED reaches "0", the comparison circuit 23 outputs a match signal EQ, which is supplied to the state control circuit 17. This coincidence signal EQ ("1" signal) is detected at step _SP16 , and the processing of the state control circuit 17 proceeds to step _SP3 . Step SP ₃
Then, the attack pulse AP is output to the latch circuit 25 (see FIG. 7). As a result, the key code KC of key C ₄ in latch circuit 4 is changed to latch circuit 25.
and output to the musical tone signal forming section 14 (see No. 7 in FIG. 7).

Thereafter, the envelope data ED is sequentially outputted from the EG 7 (see O in FIG. 7) and supplied to the tone signal forming section 14, as in the case described above. The musical tone signal forming section 14 forms a musical tone signal for key _C4 ,
Output to the sound system 28. This results in
The musical tone of key C ₄ is sounded.

In the above process, if the time t ₄ when the key C ₄ is turned off is before the time tb, the musical tone of the key C ₄ is not produced at all in the conventional electronic musical instrument.
However, in the electronic musical instrument according to this embodiment,
The pulse width of the key-on signal KON1 is expanded to T,
Therefore, since the key-on time of key _C4 is processed as being T, the musical tone of key _C4 can be sufficiently produced. Here _, as _is clear from FIG. You can set it to a long time.

Next, in FIG. 8, immediately after key G ₃ is turned off, key C ₄ is turned on for a very short time, and this key C ₄
Immediately after the key C is turned off, a key higher than key C ₄
5 is a waveform diagram of output signals from various parts of the circuit when _E4 is turned on for a short time. FIG. In this case, as shown in O in the same figure, when key G ₃ is turned off, envelope data ED first becomes Decay state S ₃ ,
Next, when the key _C4 is turned on, the dump state _S4 is entered. Key C ₄ is turned off while envelope data ED is in this dump state S ₄ ,
Next, when the key _E4 is turned on, the key code KC of the key _E4 is stored in the latch circuit ₄ when the dump state S4 of the key _G3 is completed and the attack pulse AP is output. key
After _the musical tone generation of key E 4 is completed, the musical tone generation of key E ₄ is performed. That is, in the case shown in this figure, musical tone generation for key _C4 is not performed. The reason why the pulse width of the key-on signal KON2 is longer than the time T in FIG. 8 is that the one-shot circuit 9 has been retriggered.

Next, in FIG. 9, while key G ₃ is on, key C ₄ is turned on (time t ₁ ), turned off (time t ₂ ), and turned on again (time t ₃ ). ,and,
This is a case where the key _G3 is turned off (time _t4 ) while the key _C4 is turned on. In this case, the musical tone generation state is. Envelope data ED shown in the figure
As is clear from the waveform, first the musical tone of key G ₃ is dumped, then the musical tone of key C ₄ is generated, then the musical tone of key C ₄ is dumped, then the musical tone of key G ₃ is generated, Next, the tone of key _G3 is dumped, and then the tone of key _C4 is generated.

Next, FIG. 10 shows a case where key C ₄ is turned on while key G ₃ is turned on, then turned off, and then turned on again immediately after being turned off.
In this case, when the off time t ₀ of key C ₄ is shorter than the dump time of the musical tone of key C ₄ , as is clear from the same diagram, the musical tone of key C ₄ will be restarted after the end of the dump state S ₄ of the musical tone of key C 4. Key C ₄ musical tone is generated.

Finally, the calculation 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, if the rate data RD "α _{1 "} is supplied to the arithmetic circuit 20 once every two periods of the clock pulse φ in the attack state S 1, the slope of the attack state S ₁ can be reduced to 1/2. I can do it. Similarly, if it is supplied once every three cycles, the slope can be reduced to 1/3.
The calculation timing generation circuit 19 receives a clock pulse φ
and the gate circuit 18 based on the tone data TD.
Generates timing pulse TP to control opening and closing of
This controls the slope of each state of the envelope waveform.

The reason for inserting the AND gate 6 shown in Fig. 3 is when all keys are off (state
This is because when a new key is pressed from S ₀ ) onwards, the key-on pulse KON1 is not expanded and is generated with the same length.

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, each time a new key code MKC is output from the highest note detection circuit 3, it is sequentially stored in the memory, and each time the dump state ends, the previously stored key code MKC is read out and the tone signal forming section 14. In this case, if another key code MKC is stored in the memory,
Always dump the musical tone.

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. .

Further, in the above-described embodiment, the EG7 is controlled by the key-on signal KON, but in the present invention, event pulses are generated in response to key-on and key-off, as is done in electronic musical instruments using a microcomputer. It is also applicable to those that control the EG using event pulses.

In addition, in the above embodiment, the dump state
The timing of moving from S ₄ to attack state S ₁ is
It is assumed that the envelope data ED becomes "0", but it is assumed that the duration of the dump state _S4 reaches a predetermined time, or the envelope data
The transition may be made to the attack state _S1 when the value of ED has decreased by a predetermined value from the time when the dump was started.

Furthermore, the slope of the dump state _S4 or the aforementioned predetermined time T may be changed in accordance with the tone color data TD.

As described above, according to the present invention, in an electronic musical instrument configured to generate a musical tone corresponding to a desired key in response to a musical tone generation command that instructs generation of a musical tone corresponding to the desired key, At the time when a musical sound generation command is given, (a) if no musical sound is currently being generated, generate a new musical sound corresponding to the musical sound generation time specified by the musical sound generation command; (b) If a musical tone is currently being generated, the currently generated musical tone is rapidly attenuated, and a new musical tone is to be generated even if the musical tone generation time specified by the musical tone generation command is shorter than a predetermined time. Since the new musical tone is generated with at least a time longer than the time required for the rapid attenuation, if a key is pressed with a short key press duration while a musical tone is being generated, the musical tone of the same key is is pronounced sufficiently within a range that is not unnatural,
In addition, when a musical tone is not being generated, the tone generation is performed with a tone generation time that is faithful to the key press duration time. Therefore, it is possible to obtain the effect that the performance of the electronic musical instrument is significantly improved.

[Brief explanation of drawings]

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 an embodiment of the present invention, and FIG. 4 is a key-on time in the same embodiment. A waveform diagram for explaining the function of the correction circuit 11, FIG. 5 is a block diagram showing details of EG7 in the same embodiment, and FIG.
The operation flowchart of the state control circuit 17 in the figure and FIGS. 7 to 10 are waveform diagrams for explaining the operation of the same implementation. 3...Top sound detection circuit, 4...Latch circuit, 5
. . . Differential circuit, 7 . . . Envelope generator, 9 . . . One shot circuit, 10 .

Claims (1)

[Scope of Claims] 1. In an electronic musical instrument configured to generate a musical tone corresponding to a desired key in response to a musical tone generation command instructing the generation of a musical tone corresponding to the key, a new musical tone generation command is provided. At a given time, (a) if a musical tone is not currently being generated, a new musical tone is generated corresponding to the musical tone generation time specified by the musical tone generation command; (b) if a musical tone is not currently being generated; If the musical tone currently being generated is suddenly attenuated, and even if the musical tone generation time specified by the musical tone generation command is shorter than the predetermined time, the time at which a new musical tone should be generated is at least suddenly reduced. A sound generation control method for an electronic musical instrument, characterized in that the new musical tone is generated by regarding the time as longer than the time required for decay.