JPH0594187A - Electronic musical instrument - Google Patents

Abstract

PURPOSE:To realize the electronic musical instrument which can generate a musical tone having an envelope shape peculiar to a piano. CONSTITUTION:In the case key-release is executed in an attach state of an envelope waveform which rises in accordance with a key-push operation, a state deciding means generates waveform control information for varying a waveform attenuated state in accordance with an amplitude level of the envelope waveform in this key-release time. On the other hand, an envelope signal forming means 50 forms an envelope signal of a waveform shape corresponding to this waveform control information. In such a way, a musical tone having an envelope shape peculiar to a piano can be formed.

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to an electronic musical instrument capable of forming a musical tone having a characteristic envelope shape such as a piano.

[0002]

2. Description of the Related Art As is well known, an electronic musical instrument such as an electronic piano is provided with an envelope generator for controlling the envelope waveform of a musical tone signal output from a sound source in response to key ON / OFF. In this type of envelope generator, usually, a tone signal rises based on key-on (attack state), attenuation from attack level (decay state), level retention after this attenuation process (sustain state), and after key-off. It is configured to control the muffling process (release state) of the.

[0003]

In an electronic piano equipped with such a conventional envelope generator, the envelope waveform is raised to the attack level at the attack rate according to the initial touch when a key is pressed. When the key-off is performed before reaching the attack level, the envelope waveform is uniquely attenuated at a predetermined rate from the amplitude level at the key-off time.

On the other hand, considering the sounding mechanism of an actual piano, a string is struck along with a key depression, and the musical tone generated by this string is first attenuated at a predetermined rate and then again attenuated at a different rate. Has gone through a decay. And
This is one of the factors that the musical tone peculiar to the piano is formed by passing through such a decay process.

However, as described above, in the conventional electronic piano, when the key-off is performed before the attack level is reached, the above two-step attenuation process cannot be realized, and the musical tone having the envelope shape peculiar to the piano is not achieved. There was a problem that could not be formed. The present invention has been made in view of the above circumstances, and relates to an electronic musical instrument capable of generating a musical sound having an envelope shape peculiar to a piano.

[0006]

According to the present invention, in an electronic musical instrument for controlling the envelope waveform of a musical tone signal in accordance with performance information, the state of the envelope waveform is detected and the waveform state to be set next is displayed. It is provided with state determination means for generating waveform control information and envelope signal forming means for forming an envelope signal having a waveform shape according to the waveform control information, and the state determination means is activated in response to a key depression operation. When the key is released in the attack state of the envelope waveform, the waveform attenuation mode is changed according to the amplitude level of the envelope waveform when the key is released.

[0007]

According to the above construction, when the key is released in the attack state of the envelope waveform which rises in response to the key pressing operation, the state determining means produces a waveform according to the amplitude level of the envelope waveform at the time of releasing the key. Waveform control information for changing the attenuation mode is generated, and the envelope signal forming means forms an envelope signal having a waveform shape according to the waveform control information. As a result, it becomes possible to generate a musical sound having an envelope shape peculiar to a piano.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. A. Overall Configuration of Embodiment FIG. 1 is a block diagram showing the overall configuration of an electronic piano which is an embodiment of the present invention. In this figure, 1 is a keyboard. The keyboard 1 has a mechanism for detecting the key release for each key, and for detecting the key pressing speed and the key releasing speed.
Generates a signal corresponding to the key release and key release speed.
A keyboard interface 1a generates pitch-related information, a key depression speed signal, and a key release speed signal based on various signals supplied from the keyboard 1. A CPU 2 controls each part of the electronic piano.

A ROM 3 stores various control programs loaded into the CPU 2 and various data tables used in these control programs. A RAM 4 temporarily stores various calculation results of the CPU 2 and register values. Reference numeral 5 denotes an operator, such as a damper pedal or an expression pedal, which is arranged on the electronic piano. The damper pedal of the manipulator 5 controls the attenuation amount of the musical sound according to the operation amount. Reference numeral 5a denotes an operator interface, which generates a signal corresponding to an operation amount or a signal representing an operation speed based on various signals supplied from the operator 5.

Reference numeral 6 is a panel switch provided on the electronic piano panel. The panel switch 6 includes a mode switch for switching the operation mode of the envelope generator, which will be described later, and a tone color switch for determining the tone color of the generated musical tone. Reference numeral 6a denotes a panel interface, which generates an operation signal according to the operation of each panel switch 6. The panel interface 6a is
When the above-mentioned mode switch is operated, data TYPE (described later) designating the operation mode is generated. When the tone color switch is operated, a tone color number TC designating a tone color is generated.

Next, reference numeral 7 is a tone synthesis circuit which synthesizes a tone based on various signals supplied from the CPU 2 via the bus and outputs a tone signal W formed by the tone synthesis circuit, the structure of which will be described later. SS is a sound system. The sound system SS filters the musical tone signal W, removes unnecessary noise, processes sound effects, and the like, amplifies the amplified signal, and supplies the amplified signal to the speaker SP to produce a musical sound. The electronic piano having such a configuration is characterized in that, particularly when the key-off is performed before the attack level is reached, the two-step attenuation process described above is reproduced to form an envelope shape peculiar to the piano.

B. Configuration of Musical Sound Synthesis Circuit 7 Next, FIG. 2 is a block diagram showing the configuration of the musical sound synthesis circuit 7. In this figure, 8 is an address setting circuit,
The waveform read address is set based on various signals supplied from the interface circuit 16 described later. That is, the address setting circuit 8 operates in accordance with the key-on pulse signal KONP, the key-off pulse signal KOFP, the key code KC and the key pressing speed information IT supplied from the interface circuit 16 to read the attack portion read start address ST.
ART. AD and attack section read end address EN
D. AD is generated, and this is supplied to the address generation circuit 9.

The key-on pulse signal KONP / key-off pulse signal KOFP is a signal generated in response to a key depression / release operation on the keyboard 1, and a key code KC is information indicating a pitch corresponding to a key depression operation. Further, in the address setting circuit 8, in order to read the attack waveform from the waveform storage circuit 10, the signal MODE indicating the read mode is generated. Here, when the attack waveform is read, it is not necessary to repeatedly read the attack waveform, so the signal MODE is output as "MODE = 0" instructing one read.

Reference numeral 11 denotes a phase generation circuit, which generates phase information corresponding to the key code KC when the above-mentioned key-on signal KONP is given. This phase information indicates the pitch (pitch) of a musical sound and is composed of an integer part I and a decimal part F. The address generation circuit 9 includes an integer part I of the phase information supplied from the phase generation circuit 11,
Attack section read start address START. AD is added to output the read address AD of the waveform information to be actually read.

Further, the address generation circuit 9 outputs the read address AD output from the end address END. When it becomes the same as AD, the loop waveform request signal LOO is sent to the address setting circuit 8 described above.
P. Output REQ. Further, in this case, the phase generation circuit 11 is requested to reset the reset request signal RESET. Output REQ.

The loop waveform request signal LOOP. REQ
The address setting circuit 8 supplied with the
Loop portion waveform read start address START. AD
And the loop section waveform read end address END. AD is read out and this is given to the address generation circuit 9. in this case,
Since it is necessary to repeatedly read the loop waveform, the signal MODE indicates “MODE”
= 1 ”is output. In this way, the read start address START. The address signal AD obtained by adding AD and the integer part I of the phase information is the waveform storage circuit 1
Given to 0. As a result, the waveform information stored in the waveform storage circuit 10 is read out and output as the waveform signal W1.

Next, 12 is an interpolation circuit. The interpolation circuit 12 converts the waveform signal W1 into the fractional part F of the phase information described above.
Interpolation is performed based on
Is output. In the interpolation calculation performed here, between adjacent samples, that is, two pieces of waveform information may be linearly interpolated by the decimal part F, or two or more pieces of waveform information may be temporarily stored to perform higher-order interpolation. Is also good.

Reference numeral 13 is an envelope generation circuit. The envelope generation circuit 13 is the interface circuit 1
6, the key-on pulse signal KONP, the key-off pulse signal KOFP, the key code KC, the key pressing speed information IT and the waveform-shaped envelope signal ENV corresponding to the tone color number TC are generated. Further, the envelope generation circuit 13 controls the attenuation rate (described later) of the signal ENV based on the above-mentioned data TYPE.

That is, the envelope generating circuit 13
First, the tone color number TC defines the envelope signal ENV having a predetermined waveform, and the maximum amplitude level (attack level) of the signal ENV is set based on the key pressing speed information IT. Further, the rate (progress) of the envelope signal ENV is controlled according to the key code KC, and the attenuation rate is controlled according to the data TYPE. Here, two different rates are used for this attenuation rate in order to reproduce the two-step attenuation process described above. The key-on pulse signal KONP and the key-off pulse signal KOFP are used for timing control when forming the envelope signal ENV. 14 is a multiplication circuit,
The signal W2 output from the interpolation circuit 12 is multiplied by the envelope signal ENV output from the envelope generation circuit 13, and the result of this multiplication is output as the tone signal W described above.

C. Configuration of Waveform Storage Circuit 10 Next, FIG. 3 shows the waveform storage circuit 10 described above (see FIG. 2).
It is a figure which shows the concept of the storage form of the waveform memory with which it is equipped. The waveform memory provided in the waveform storage circuit 10 independently stores an attack waveform portion used when a musical tone is generated and a loop waveform portion used to maintain the generated musical tone. Since the attack waveform of a musical sound is a very characteristic waveform that determines the tone color peculiar to a musical instrument, it is difficult to compress the amount of information. On the other hand, the loop waveform, which is the stationary part, has little change and the envelope is added to the same waveform, and this is read repeatedly,
The amount of information can be compressed.

FIG. 3 shows the concept of the storage form of the attack waveform portion among them. That is, in this waveform memory, the storage area of the attack waveform section is divided in correspondence with the key pressing speed and the key area in which the key is pressed, and different waveforms are obtained based on this. In addition,
WA (M, N) shown in this figure represents an array element of the storage area. Ideally, the storage area is divided at each key pressing speed and each pitch. However,
In this way, the memory occupation area increases, so that each is provided with a typical waveform.

Next, FIG. 4 is a memory layout diagram showing a specific example of the layout on an actual memory based on the above-mentioned concept of the waveform memory. That is, FIG. 4A is a memory map showing the configuration of the entire waveform memory, and FIG. 4B is a memory map showing the contents of the attack part table. In these memory maps, the IT range and the KC range are numerical values indicating how much the key depression speed and the key bank (pitch) shown in FIG. 3 are divided. Subsequent to these ranges, a read start address and a read end address of the waveform information for each divided area are registered.

Next, FIG. 7C is a memory map showing the contents of the loop part table, and its configuration is the same as that of the attack part described above. In this loop part table, the storage area is divided similarly to the attack part waveform, but each IT range and K
By changing the C range, the division form can be changed. Next, FIG. 6D is a memory map showing the contents of the waveform storage section. Here, each waveform information is stored at the address designated by the attack section table and the loop section table. In order to facilitate connection between waveforms, each waveform information compensates for 0 phase at the read end address in the attack waveform, and 0 phase at both the read start address and the read end address in the loop waveform. Has been compensated.

D. Configuration of Interface Circuit 16 FIG. 5 is a block diagram showing the configuration of the interface circuit 16 described above. As shown in this figure, the interface circuit 16 generates various operation parameters necessary for synthesizing a musical tone signal from various signals supplied from the CPU 2. The interface circuit 16 implements the above-mentioned operation parameters (KONP, KON, KOFP, KOF, TC, TY) in order to realize a polyphonic sound (for example, 16 sounds).
(PE, KC, IT) is generated in a time division manner and supplied to the tone synthesis circuit 7.

E. Configuration of Envelope Generating Circuit 13 The envelope generating circuit 13 described above includes a rate / target setting unit 20, a state control unit 23, and an envelope forming unit 30, and the configuration of each of these units will be sequentially described. Configuration of Rate / Target Setting Unit 20 First, FIG. 6 is a block diagram showing the configuration of the rate / target setting unit 20. In this figure, 21 is a conversion table, which refers to the table according to the supplied key code KC and tone color number TC to generate various parameters. The various parameters are the attack rate AR,
First decay rate D1R, first decay level D1
L, second decay rate D2R, second decay level D
2L and the third decay rate D3R.

Here, regarding the above parameters, FIG.
This will be described with reference to the envelope waveform example shown in (b).
First, the attack rate AR is data representing the slope of the envelope waveform that rises with key-on. The first and second decay rates D1R and D2R are attenuation rates for reproducing the two-step attenuation described above,
When it is attenuated from the rising peak of the envelope waveform to the first decay level D1L, it is attenuated at the first decay rate D1R, and then the second decay level D2.
When decaying to L, the second decay rate D2R is used. Further, the third decay rate is an attenuation rate when released after the sustain state.

Next, returning to FIG. 6 again, the configuration of the rate / target setting unit 20 will be described. In the figure, 2
2 is a selection circuit. The selection circuit 22 is based on the state signals S1 and S0 representing the current waveform control state, and is a control parameter (RAT) that serves as an index for the next waveform control.
E, TARGET, HOLD, AT0). Among these control parameters, RATE is the envelope signal E
This is data representing the slope of NV. For example, when the envelope waveform is raised at the time of key-on, the attack rate AR is selected and is output to the next stage as data RATE. When the envelope waveform is attenuated, the first decay rate D1R,
Second decay rate D2R and third decay rate D
One of 3R is selected and output as data RATE. In this selection, the state signals S1,
Reference is made to S0.

Next, among the above control parameters, TARG
ET is data serving as a target value when controlling the amplitude of the envelope signal ENV in the attenuation process, and is the first value described above.
Decay level D1L and second decay level D2L
Is selected. In addition, the data HOLD is
It is data referred to when forming the sustain state in the envelope waveform. The data AT0 is data representing the attack level at the rising edge of the envelope waveform. Incidentally, the reason why the attack level is uniquely generated in this way is that when the attack level is generated by the table reference method, a delay occurs when the musical sound is generated.

Configuration of State Control Unit 23 FIG. 7 is a circuit diagram showing the configuration of the state control unit 23. The state control unit 23 is an LSI-based state management unit 2
3a and timing control unit 23b. In this figure, 24, ..., 24 are inverters,
Reference numerals 25 and 25 are shift registers in which the state signals S1 and S0 representing the state of the envelope signal ENV are temporarily stored, respectively. Reference numeral 26 is an AND gate that is arranged in a matrix and outputs a logical product of input signals indicated by white circles in the figure, and 27 is an OR gate.

The state management unit 23a generates state data DS indicating the state to be controlled next, according to the current state of the envelope signal ENV and the input information ID supplied from each section. The process of generating the state data DS will be described in the operation description below.

The timing control unit 23b, like the above-mentioned unit 23a, has an envelope generating section 30 according to the current state and the input information ID supplied from each section.
On the other hand (described later), a selection signal SEL for instructing the data to be loaded next is generated. For example, in the input relation shown by the line A in the figure, when the dump state is set and the current state is "3", the signal "ADDER SE
L ”(described later) is generated. The selection signal SEL generated in this way is used in the envelope forming unit 30 described later.

Structure of Envelope Forming Unit 30 FIG. 8 is a block diagram showing the structure of the envelope forming unit 30. In this figure, 31 is a selector, and 4
Of the 12-bit data set at the input terminals “00” to “11”, any one of the above-mentioned state signals S
1 and S0 are selected and output. That is, when the input terminal "00 (0)" is selected, "0000"
(Hexadecimal display) shows the first decay level D1 represented by 12 bits when the input terminal "01 (1)" is selected.
L is 1 when the input terminal “10 (2)” is selected.
As for the second decay level D2L represented by 2 bits, "1FFF" is output from the output terminal OUT when the input terminal "11 (3)" is selected. The 12-bit data output from the output terminal OUT serves as a target value when controlling the amplitude level of the envelope signal ENV, and is defined as target data TARGET.

Next, 32 is a first comparison circuit, which is a data EG representing the current envelope amplitude level supplied to the input terminal A and the target data TA supplied to the input terminal B.
Compare with RGET, and if "A>B", data GT
And the data EQ is generated when “A = B”. That is, as shown in FIG. 9, the comparison circuit 32 includes a full adder 32a, inverters 32b, ..., 32b, and an AND gate 32c. Then, the target data TARG inverted via the inverter 32b
ET is supplied to the input terminal B (B1 to B12), while data EG is supplied to the input terminal A (A1 to A12), and both are added by the full adder 32a. In this addition, "0" is set to the carry input terminal CI of the full adder 32a.

In the first comparison circuit 32 having such a configuration, for example, the data EG and the target data TARGET are set.
If and match, the outputs S0 to S12 of the full adder 32a
Are all "1", and these outputs S0 to S12 are output as the data EQ via the AND gate 32c. On the other hand, when the data EG is larger than the target data TARGET, the data GT is output from the carry output terminal CO.

Next, 33 is an arithmetic circuit for calculating a new envelope amplitude level according to the comparison result of the first comparison circuit 32. This arithmetic circuit 33 includes a full adder 33a and exclusive OR gates 33b, ..., 3 as shown in FIG.
3b and. The full adder 33a performs addition and subtraction according to the status of the data GT supplied to the carry input terminal CI. That is, when the data EG is larger than the target data TARGET, the data GT becomes "1", and the subtraction is performed so that the envelope amplitude level approaches the target value. On the other hand, in the opposite case, that is, when the data GT is "0", addition is performed.

In such a configuration, for example, when the data EG is larger than the target data TARGET, the data EG supplied to the input end A is changed to the data RATE supplied to the input end B, that is, the envelope signal ENV.
The subtraction is performed according to the data (6 bits) indicating the slope of, and the subtraction result is output as the data CEG. This data C
EG becomes data representing a new envelope amplitude level. On the other hand, if the data EG is smaller than the target data TARGET, addition is performed, and if an overflow occurs due to this addition, the data OV is output from the carry output terminal CO.
F is output.

Next, 34 is a second comparison circuit, which compares the data CEG supplied to the input terminal A with the target data TARGET supplied to the input terminal B, and when the data is "A>B", Generate CGT. This second comparison circuit 34
Has a configuration similar to that of the first comparison circuit 32, as shown in FIG.

The reason why the first comparison circuit 32 and the second comparison circuit 34 are provided in the stages before and after the arithmetic circuit 33 is as follows. First, the first comparison circuit 32 compares the current envelope amplitude level with the target amplitude level, and based on the comparison result, the arithmetic circuit 33.
To control. Then, the second comparison circuit 34 compares again the new envelope amplitude level generated by the arithmetic circuit 33 with the target amplitude level, and confirms that the amplitude of the envelope signal ENV has reached the target value. It is a translation.

Next, 35 is a selector, which has input terminals A ...
Select signal SEL to select any one of the data supplied to C
Select and output according to. Here, the above-mentioned data CEG is supplied to the input terminal A, and "1FFF" is supplied to the input terminal B.
(Hexadecimal display) "is supplied, and the target data TARGET described above is supplied to the input terminal C. Further, the selection signal SEL is the timing control unit 23b described above.
(See FIG. 7), which is a signal generated in (FIG. 7) and which selects the data to be supplied to the input terminal A “ADDERSEL”
And a signal "1F for selecting the data supplied to the input terminal B.
FF SEL ”and a signal“ TARGET SEL ”for selecting data supplied to the input terminal C.

Next, 36 is a shift register, which temporarily stores the data output from the selector 35. In addition,
The shift register 36 is configured to operate in a time division manner in response to sounding 16 tones. A conversion table 37 generates a multiplication coefficient K corresponding to the key pressing speed information IT described above. 38 is a multiplier, which is a shift register 3
The data output from 6 is multiplied by the multiplication coefficient K, and the result of this multiplication is output as the envelope signal ENV.

As shown in FIG. 12, reference numeral 39 is a detection circuit composed of exclusive OR gates 39a and 39b and an OR gate 39c. The detection circuit 39 includes the data EQ, the data GT, the data OVF, and the data CG described above.
Based on T, the state of the current envelope amplitude level is detected. That is, the data GT indicating that the current envelope amplitude level is higher than the target value and the data TGTEQ indicating that the calculated envelope amplitude level is higher than or equal to the target value are generated. The data GT and the data T output from the detection circuit 39
GTEQ is used as the input information ID of the state management unit 23a described above.

F. Operation of the Embodiment Next, the operation of the embodiment having the above configuration will be described with reference to FIGS. 7 and 13. Note that here, in order to simplify the description, the operation in each mode in the envelope generation circuit 13 is particularly shown. This mode is an operation defined by the above-mentioned data TYPE,
When the data TYPE is "0", the normal mode is set, and when the data TYPE is "1", the piano mode is set.

A) Operation in normal mode In this normal mode, the waveform of the envelope signal ENV is controlled in the manner shown in FIG. This will be described with reference to FIG. 7. In the case of the key-off state or the dump state In this case, in the state management unit 23a, the state data DS becomes "3" based on the input relationship shown in the line a (dump state) or the line b (key-off state). Further, in the timing control unit 23b, the signal "TARGET SEL" is generated based on the input relationship shown in the line B. Since "1FFF" is set in the target data TARGET at this time in the selector 31, the envelope signal ENV is not generated.

At the time of key-on When the key is turned on, the envelope signal ENV rises based on the attack rate AR generated by the rate / target setting circuit 20 and the attack level AT0 ("0000"). State data D at this time
S is uniquely "0". Prior to this rising, the timing control unit 23b generates the signal "1FFF SEL" based on the input relationship shown in the line C. This is done by changing the data EG to "1F
This is for resetting to the FF "level.

When the key is on: The envelope amplitude level is the attack level AT0 ("0
000 ") and the previous state is" 0 "during key-on, the state data DS becomes" 1 "due to the input relationship shown in the line c. As a result, the envelope signal ENV is attenuated at the first decay rate D1R. Then, when the input relation shown in the line e is entered, the state data DS becomes “2”, and the second decay rate D2R
The envelope signal ENV is attenuated by. Then, when the envelope amplitude level reaches the second decay level D2L, the second decay level D
Hold at 2L.

In the case of key-off When key-off (key-off A shown in FIG. 13A), the state data DS is input from the input relation shown in line g.
Is uniquely set to "3". As a result, the envelope signal ENV is released based on the third decay rate D3R.

When the key is turned off in the attack state By the way, the envelope signal EN is set at the attack rate AR.
When the key-off (key-off B) is performed while V is rising, the voltage is attenuated based on the third decay rate D3R according to the operation of the above item. In this way, in the normal mode, when the key is off in the attack state,
It decays immediately without two-step decay.

B) Operation in the piano mode In this piano mode, the attack level AT
When a key press operation reaching 0 (“0000”) is performed,
The same envelope control as in the normal mode is executed. Therefore, a feature of this mode is that the envelope signal ENV is controlled so as to be attenuated by two steps even if the key-off is made in the attack state. Below,
This operation will be described.

When the key is turned off at the first decay level D1L or higher In this case, the state data DS becomes "1" due to the input relationship shown by the line h in the state management unit 23a, and the envelope signal ENV is attenuated at the first decay rate D1R. To do. Then, when the envelope amplitude level reaches the second decay level, the state data DS becomes "3" from the input relationship shown in the line k, and the third decay rate D3.
At R, the signal ENV is attenuated. As a result, it is possible to reproduce the two-step attenuation process peculiar to the piano even if the key-off is made in the attack state.

In the case where the key is turned off at the first decay level D1L or less In this case, since it is attenuated from a low amplitude level, it is not necessary to attenuate it by two stages, and the state data DS is uniquely set from the input relation shown in the line l. 3 ",
The envelope signal ENV is attenuated at the third decay rate D3R.

As described above, in the electronic piano according to the above-described embodiment, when the key-off is performed before the attack level is reached, an envelope waveform that undergoes a two-step attenuation process is generated like an actual piano, so that a musical tone peculiar to the piano is generated. Can be formed.

[0052]

As described above, according to the present invention, when the key is released in the attack state of the envelope waveform which rises in response to the key depression operation, the state determination means causes the envelope at the time of the key release. Since the waveform control information for changing the waveform attenuation mode is generated according to the amplitude level of the waveform, and the envelope signal forming means forms the envelope signal of the waveform shape according to the waveform control information, it has an envelope shape peculiar to the piano. It can generate musical tones.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of an electronic piano that is an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a musical sound synthesis circuit 7 in the embodiment.

FIG. 3 is a diagram for explaining a storage form of a waveform storage circuit 10 in the same embodiment.

FIG. 4 is a view showing a memory map of the waveform storage circuit 10 in the embodiment.

FIG. 5 is a block diagram showing a configuration of an interface circuit 16 in the embodiment.

FIG. 6 is a block diagram showing a configuration of a rate / target setting unit 20 in the embodiment.

FIG. 7 is a circuit diagram showing a configuration of a state control unit 23 in the embodiment.

FIG. 8 is a block diagram showing a configuration of an envelope forming unit 30 in the embodiment.

FIG. 9 is a circuit diagram showing a configuration of a first comparison circuit 32 in the embodiment.

FIG. 10 is a circuit diagram showing a configuration of an arithmetic circuit 33 in the embodiment.

FIG. 11 is a block diagram showing the configuration of a second comparison circuit 34 in the embodiment.

FIG. 12 is a circuit diagram showing a configuration of a detection circuit 39 according to the same embodiment.

FIG. 13 is an envelope signal ENV in the same embodiment.
FIG. 6 is a diagram showing an example of control of FIG.

[Explanation of symbols]

13 ... Envelope generating circuit, 20 ... Rate / target setting unit, 23 ... State control unit, 30 ... Envelope forming unit, 39 ... Detection circuit.

Claims (1)

[Claims] 1. An electronic musical instrument for controlling an envelope waveform of a musical tone signal in accordance with performance information, the state determination of detecting the state of the envelope waveform and generating waveform control information representing a waveform state to be set next. Means, and an envelope signal forming means for forming an envelope signal having a waveform shape according to the waveform control information, wherein the state determining means separates in an attack state of the envelope waveform rising in response to a key pressing operation. An electronic musical instrument characterized in that when a key is pressed, the waveform attenuation mode is changed according to the amplitude level of the envelope waveform when the key is released.