JP4935556B2 - Electronic musical instrument resonance sound adding device and electronic musical instrument - Google Patents

Description

  The present invention relates to an electronic musical instrument resonance sound adding apparatus and an electronic musical instrument for adding a resonance sound to a musical sound.

  Conventionally, a technique for changing a musical tone by connecting a pedal to an electronic musical instrument and depressing the pedal is known.

  Patent Document 1 discloses an electronic musical instrument that can generate a musical sound particularly when a half pedal is used by changing the envelope of musical sound waveform data according to the amount of pedal depression.

  Further, Patent Document 2 includes a resonance generating device that generates resonance sound data RWD based on waveform data SWD corresponding to a musical sound waveform, and the detection output of the amount of depression of the damper pedal is a minimum value 0 as the damper pedal is depressed. The waveform data SWD is controlled so that the amplitude level is decreased by the multiplier in the process of going from 1 to the maximum value 1, and the amplitude level of the resonance data RWD from the resonance generator is increased by the multiplier. It is disclosed that it is controlled.

For example, it is common for a resonant sound creating device (resonant sound adding device) to receive digital musical sound waveform data and filter the musical sound waveform data with a digital filter. In the filter processing, an FIR (Finite Impulse Response) filter or IIR (Infinite Impulse Response: Infinite Impulse)
Response) filter is used.

When the FIR filter is used, it is obtained from the input music signal data x (nk) (k = 0, 1, 2,..., N-1) and the reverberation characteristics of the music hall. By performing a convolution operation on the impulse response a (k), resonance sound data yout (n) = Σx (n−k) × a (k) can be obtained.
JP-A-7-84574 Japanese Patent No. 2692672

  As in Patent Document 1, simply by changing the envelope of the musical sound waveform data, the resonance sound including the reverberation sound when the piano damper pedal is depressed cannot be reproduced by the electronic musical instrument.

  Further, in Patent Document 2, the mixing ratio with the resonance sound is changed by so-called crossfade, but the resonance sound itself does not change, so that there is a problem that the change in the resonance sound due to depression of the pedal is poor. .

  It is an object of the present invention to provide a resonance sound adding device that can appropriately generate a resonance sound and a resonance sound whose degree of resonance has changed appropriately by depressing a damper pedal, and an electronic musical instrument including the resonance sound adding device. To do.

The present invention is a resonance addition device for adding a resonance sound having a degree of resonance according to the depression amount of a damper pedal to musical tone waveform data,
Impulse response data composed of impulse response coefficients that are values on the time axis representing impulse response characteristics, based on first impulse response data including a set of impulse response coefficients and the first impulse response data A storage device storing second impulse response data including a set of impulse response coefficients having a greater degree of resonance than the resonance sound;
Resonance sound generating means having a convolution operation circuit that reads impulse response data stored in the storage device and performs a product-sum operation on a series of musical sound waveform data on the time axis and an impulse response coefficient included in the impulse response data And comprising
The resonance generating means selects the first impulse response data when the depression amount of the damper pedal is smaller than a predetermined threshold, and the second when the depression amount of the damper pedal is equal to or larger than the predetermined threshold. In response to the impulse response data control signal for selecting the impulse response data, the impulse response data is read from the storage device according to the impulse response data control signal,
Further, the resonance generating means is a constant value when the depression amount of the damper pedal is smaller than the predetermined threshold value, and when the depression amount of the damper pedal is larger than the predetermined threshold value, the value increases as the depression amount of the damper pedal increases. A multiplication circuit that multiplies the output signal from the convolution operation circuit in accordance with a multiplication control signal including an increasing coefficient, and the resonance sound data output from the multiplication circuit and the musical sound waveform data are added and output. This is achieved by a resonance sound adding device characterized by the above.

  In a preferred embodiment, the coefficient is stored in a coefficient memory in a storage device.

In addition, an object of the present invention is to output a signal indicating that there is no depression, that the depression amount is the maximum, or that the depression amount is intermediate between the two states. A resonance sound adding device for adding a resonance sound having a degree of resonance according to a depression amount of a damper pedal to musical sound waveform data,
Impulse response data composed of impulse response coefficients that are values on the time axis representing impulse response characteristics, based on first impulse response data including a set of impulse response coefficients and the first impulse response data A storage device storing second impulse response data including a set of impulse response coefficients having a greater degree of resonance than the resonance sound;
Resonance sound generating means having a convolution operation circuit that reads impulse response data stored in the storage device and performs a product-sum operation on a series of musical sound waveform data on the time axis and an impulse response coefficient included in the impulse response data And comprising
The resonance generation unit causes the first impulse response data to be selected when the depression amount of the damper pedal indicates a predetermined first depression amount, and the depression amount is larger than the predetermined first depression amount. When an impulse response data control signal for selecting the second impulse response data is received when the second depression amount indicating the above is indicated, the impulse response is received from the storage device according to the impulse response data control signal. Read data,
Furthermore, when the signal indicating the depression amount of the damper pedal indicates that there is no depression , the resonance generation circuit gradually decreases to a predetermined minimum value and indicates that the depression is maximum. A multiplication circuit that multiplies the output signal from the convolution circuit according to a multiplication control signal including a coefficient that gradually increases to a maximum value, and the resonance sound data output from the multiplication circuit and the musical sound waveform data are added. This is achieved by a resonance sound adding device characterized by being output in the same manner.

In a preferred embodiment, when the signal indicating the depression amount is the intermediate depression amount, a multiplication including a coefficient that gradually decreases or increases to a predetermined intermediate value between the minimum value and the maximum value. The multiplication circuit multiplies the resonance sound data according to a control signal.

Another object of the present invention is to provide the above-described resonance adding device,
The keyboard,
A damper pedal that outputs a signal indicating the depression amount;
This is achieved by an electronic musical instrument characterized by comprising musical tone generation means for generating musical tone waveform data of the pitch of the key pressed among the keys constituting the keyboard.

  According to the present invention, it is possible to provide a resonance sound adding device that can appropriately generate a resonance sound and a resonance sound whose degree of resonance has changed appropriately by depressing a damper pedal, and an electronic musical instrument including the resonance sound adding device. It becomes possible.

  Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of the electronic musical instrument according to the first embodiment of the present invention.

  As shown in FIG. 1, the electronic musical instrument 10 according to the present embodiment includes a keyboard 12, a CPU 14, a ROM 16, a RAM 18, a musical tone generator 20, an operator group 22, and a damper pedal 24. The keyboard 12, CPU 14, ROM 16, RAM 18, musical tone generator 20 and operator group 22 are connected via a bus 28. The musical sound generation unit 20 includes a sound generation circuit 25, a resonance sound addition circuit 26, and an acoustic system 27.

  The keyboard 12 can transmit to the CPU 14 information specifying the key that has been pressed and information indicating the velocity of the key that has been pressed, in accordance with the player's key pressing operation.

  The CPU 14 performs system control, generation of various control signals to be given to the musical tone generation unit 20 for generating musical tones corresponding to the depressed key. The ROM 16 stores programs, constants used when the programs are executed, waveform data that is the basis of musical sound waveform data generated by the musical sound generator 20, impulse response data used by the resonance sound adding circuit 26, and the like. Remember. The RAM 18 temporarily stores variables, parameters, input data, output data, and the like necessary in the course of program execution.

  The damper pedal 26 can output a signal indicating not only the on / off state but also the depression amount. For example, it can be realized by providing a variable resistance value whose resistance value can be changed according to the depression amount of the damper pedal 26 and outputting a signal corresponding to the resistance value.

  FIG. 2 is a block diagram showing an example of a sound generation circuit, a resonance sound adding circuit, and components related thereto according to the present embodiment.

  As shown in FIG. 1 and FIG. 2, the sound generation circuit 25 is predetermined based on the tone color information indicating the tone color of the musical tone to be generated, the pitch information indicating the pitch to be generated, and the velocity information. The tone waveform data having a predetermined tone pitch is output. The tone color information, pitch information and velocity information constitute the control signal 1.

  The pitch information and velocity information included in the control signal 1 are generated by the CPU 14 based on the signal from the keyboard 12. The timbre information included in the control signal 1 is generated by the CPU 14 based on information obtained by operating the operators included in the operator group 22 by the performer.

  The resonance addition circuit 26 includes a convolution operation circuit 30, a multiplication circuit 31, and an adder 32, and generates resonance sound data based on the musical sound waveform data according to the control signals (control signal 2 and control signal 3). Generates and outputs synthesized data obtained by synthesizing data and resonance sound data. As shown in FIG. 2, the control signal 2 is given to the convolution operation circuit 26, and the control signal 3 is given to the multiplication circuit 31. The control signal 2 and the control signal 3 are generated by the CPU 12 according to the on / off state of the pedal and the depression amount of the pedal.

  The acoustic system 27 includes a D / A converter, an amplifier circuit, and a speaker, converts the synthesized data into an analog signal, amplifies the analog signal, and emits sound from the speaker.

  FIG. 3 is a block diagram showing a configuration example of the sound generation circuit and the waveform memory according to the present embodiment. As shown in FIG. 3, the sound generation circuit 25 according to the present embodiment includes a waveform reproduction circuit 36, an envelope generation circuit 37, and a multiplication circuit 38.

  The waveform memory 35 stores waveform data of various timbres such as piano timbre data and folk guitar timbre data. The waveform memory 35 is realized by, for example, the ROM 16. The waveform reproduction circuit 36 includes waveform data of a predetermined type (for example, piano timbre) in the control signal 1 from various timbre data stored in the waveform memory 35 in accordance with the timbre information included in the control signal 1. Read according to pitch information. The envelope generation circuit 37 outputs envelope data according to the velocity information included in the control signal 1. The waveform data and the envelope data are multiplied by the multiplication circuit 38, and musical tone waveform data is output.

  FIG. 4 is a block diagram showing a configuration example of the convolution operation circuit and the impulse response memory of the resonance sound adding circuit according to the present embodiment. As shown in FIG. 4, the convolution operation circuit 30 includes an impulse response memory read circuit 41, a musical sound waveform data buffer 42, an impulse response coefficient buffer 43, and a product-sum operation unit 44.

  The impulse response memory 40 stores various impulse response data such as piano impulse response data 1 and piano impulse response data 2. The impulse response memory 40 is realized by, for example, the ROM 16.

  In the present embodiment, two types of impulse response data are prepared for a certain series of timbres. For example, piano-type impulse response data 1 and piano-type impulse response data 2 are prepared for piano tone color data stored in the waveform memory 35. Guitar-type impulse response data 1 and guitar-type impulse response data 2 are prepared as guitar-type tone color data (folk guitar tone color data and gut guitar tone color data). In addition, violin-type impulse response data 1 and violin-type impulse response data 2 are prepared for string instrument-type timbre data (cello timbre data and violin timbre data) such as violin. The two types of impulse response data are switched by the control signal 2 and read from the impulse response memory read circuit 41. The control signal 2 will be described later in detail.

  The musical sound waveform data buffer 42 is a delay memory for storing n musical sound waveform data from the latest musical sound waveform data x (n) to the musical sound waveform data x (1) before n-1 samples. The impulse response coefficient buffer 43 is a delay memory that stores n impulse response coefficients a (0) to a (n-1) included in the impulse response data. The musical tone waveform data buffer 42 and the impulse response coefficient buffer 43 can be realized by the RAM 18.

The impulse response coefficients constituting the impulse response data are a (0), a (1),... Are values on the time axis, as shown in FIG. a (2),..., a (n−1) are constants to be multiplied by x (n), x (n−1),. The product-sum operation unit 44 reads the musical sound waveform data x (nk) (k = 0, 1, 2,..., N-1) stored in the musical sound waveform data buffer 42, and the impulse response coefficient The impulse response coefficient a (k) stored in the buffer 43 is read out, multiplied by these, and added to the accumulated value. Thereby, the following resonance sound data yout (n) can be output.
yout (n) = Σx (n−k) × a (k) (k = 0, 1, 2,..., n−1)
Next, the control signal 2 will be described. As described above, according to the control signal 2, the impulse response memory reading circuit 41 reads out one of two types of impulse response data for a certain series of timbres. If it is a piano tone, the impulse response memory read circuit 41 reads either the piano impulse response data 1 or the piano impulse response data 2 in accordance with the control signal 2.

  FIGS. 6A and 6B are graphs showing examples of piano-type impulse response data 1 and piano-type impulse response data 2, respectively. 6A and 6B, the vertical axis represents the value of the impulse response coefficient, and the vertical axis represents the time axis.

  The impulse response data 1 shown in FIG. 6A is measured in a state where the damper pedal of the piano is not depressed. On the other hand, impulse response data 2 shown in FIG. 6 (b) is measured with the piano damper pedal fully depressed. Compared to the impulse response coefficient of FIG. 6A, the impulse response coefficient of FIG. 6B has a higher degree of resonance. Here, the degree of resonance is large means that the value of the impulse response coefficient is large and the value is long in the time axis (horizontal axis) direction over almost the entire region in the time axis direction.

  6 (a) and 6 (b) are impulse response data applied to piano-type timbres, but in this embodiment, other timbres (guitar-type timbres and violin-type timbres) are used. Is also provided with two types of impulse response data. Also for other timbres, the impulse response coefficient of the impulse response data 2 has a higher degree of resonance than the impulse response coefficient of the impulse response data 1.

  As will be described later, in the present embodiment, when the pedal is further depressed, the impulse response data 2 is used to generate a resonance sound having a higher degree of resonance, and the pedal is not depressed and the pedal is not depressed. The impulse response data 1 is used in order to generate a resonance sound with a weaker degree of resonance when the step is not depressed much. Therefore, the impulse response coefficients of the impulse response data 1 and the impulse response data 2 are as described above.

  The CPU 14 selects the impulse response data 1 when the depression amount of the damper pedal 24 is smaller than the predetermined threshold value, and selects the impulse response data 2 when the depression amount of the damper pedal 24 is equal to or larger than the predetermined threshold value. Is output to the impulse response memory read circuit 41 of the convolution operation circuit 30.

  The resonance data output from the convolution operation circuit 30 is multiplied by the multiplication circuit 31 based on the control signal 3.

  Hereinafter, the control signal 3 will be described in more detail. FIG. 7 is a block diagram of members that generate the control signal 2 and the control signal 3 according to the present embodiment. In FIG. 7, the pedal depression amount detection unit 46 and the control signal generation unit 47 are realized by the CPU 24. The level coefficient memory 45 is realized by the ROM 16. The pedal depression amount detection unit 46 detects the depression amount of the damper pedal 24 and outputs it to the control signal generation unit 46.

  FIG. 8 is a graph for explaining the level of the resonance sound data multiplied by the multiplication circuit and the sound pressure level of the musical sound waveform data. In FIG. 8, the horizontal axis represents the pedal depression amount, and the vertical axis represents the sound pressure level. In FIG. 8, the solid line indicated by reference numeral 801 and the broken line indicated by reference numeral 802 indicate resonance sound data whose level is adjusted by the control signal 3. A one-dot chain line indicated by reference numeral 803 corresponds to the level of the musical sound waveform data.

  In the range where the pedal depression amount is indicated by the solid line 801, the impulse response read circuit 41 of the convolution operation circuit 30 reads the impulse response data 1 by the control signal 2, while the pedal depression amount is the broken line 802. In the range shown in FIG. 2, the impulse response read circuit 41 of the convolution operation circuit 30 reads the impulse response data 2 by the control signal 2. That is, the position indicated by reference numeral 810 corresponds to the threshold value for switching impulse response data by the control signal 2.

  Therefore, the control signal generation unit 47 selects the impulse response data 1 when the pedal depression amount is smaller than the value indicated by reference numeral 810, and the impulse response data 2 when the depression amount of the damper pedal 24 is equal to or larger than the value indicated by reference numeral 810. A control signal 2 is generated so as to select and output.

  Further, in the present embodiment, the control signal 3 corresponding to the pedal depression amount is generated so that the level of the resonance sound data becomes a solid line 801 and a broken line 802. For example, a multiplication coefficient corresponding to the pedal depression amount is stored in the coefficient table 45, and a predetermined multiplication coefficient is read from the coefficient table 45 based on the pedal depression amount given from the pedal depression amount detection unit 46 and the control signal 3. As output.

  As can be understood from FIG. 8, in the present embodiment, the resonance level data based on the impulse response data 1 is set to the first level, and then the resonance body data based on the impulse response data 2 is set to the second level. As the amount of pedal depression increases, the level increases, and when the second level is reached, a control signal 3 is generated that remains constant at the second level even when the amount of pedal depression increases. And output.

  The multiplier circuit 31 outputs resonance sound data of a predetermined level based on the control signal 3 generated as described above. The adder 32 adds the musical sound waveform data of a certain level (see the one-dot chain line 803 in FIG. 8) to the resonance sound data. The synthesized data output from the adder 32 is output to the acoustic system 27, converts the synthesized data into an analog signal, amplifies the analog signal, and emits sound from the speaker.

  According to the present embodiment, when the depression amount of the damper pedal 24 is smaller than the predetermined threshold, the impulse response data 1 is selected, and when the depression amount of the damper pedal 24 is equal to or larger than the predetermined threshold, the impulse response data 2 is selected. Such a control signal 2 is generated, and the impulse response data is switched by the control signal 2. As a result, the resonance sound is changed in response to depression of the damper pedal 24. For example, by depression of the damper pedal 24, it is possible to generate a resonance sound having a higher degree of resonance.

  Further, according to the present embodiment, the pedal is depressed until the resonance level data based on the impulse response data 1 reaches the first level, and thereafter the resonance body data based on the impulse response data 2 until the second level is reached. As the amount increases, the level increases, and when the second level is reached, a control signal 3 is generated that is constant at the second level even if the pedal depression amount is increased. 3 adjusts the level of the resonance data and adds it to the musical sound waveform data. Therefore, it is possible to control the level of the resonance sound according to the pedal depression amount, such as increasing the resonance level according to the increase of the pedal depression amount.

  Furthermore, according to the present embodiment, the coefficient table stores the multiplication coefficient corresponding to the pedal depression amount, and the control signal (control signal 3) including the multiplication coefficient corresponding to the pedal depression amount is output. Accordingly, it is possible to appropriately determine the level of the resonance sound data with a simple configuration.

  In the present embodiment, the multiplication coefficient is a constant value when the amount of depression of the damper pedal is smaller than the predetermined threshold, and when the amount of depression of the damper pedal is equal to or larger than the predetermined threshold, the amount of depression of the damper pedal increases. The value increases with this. As a result, it is possible to reproduce a situation in which the resonance level does not increase when the depression amount is small, and the resonance level increases when the depression amount exceeds a certain level.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the damper pedal 24 can output a signal indicating the depression amount. In the second embodiment, the damper pedal has two switches, and generates the control signal 3 based on the on / off states of the two switches.

  FIG. 9 is a diagram illustrating an example of a damper pedal according to the second embodiment. As shown in FIG. 9, the damper pedal 90 according to the second embodiment has a movable portion 91 that a player steps on with a foot, and a lower main body 96 that is in close contact with the floor. A first switch 92 and a second switch 93 are attached to the upper surface of the lower main body 96.

  When the movable portion 91 of the damper pedal 90 is stepped on by the performer's foot, first, the protrusion 94 provided at a position facing the first switch 92 on the lower surface of the movable portion 91 contacts the first switch 92. The first switch 92 is turned on. When the movable portion 91 of the damper pedal 90 is further stepped on, the protrusion 95 provided at a position facing the second switch 93 on the lower surface of the movable portion 91 comes into contact with the second switch 93, and the second switch 93 is Turns on. When the performer releases the pedal, first, the second switch 93 is turned off, and then the first switch 92 is turned off.

  Therefore, by using the damper pedal according to the second embodiment, there is no depression, the maximum depression amount, no depression, and the depression amount according to the depression amount of the damper pedal. It can indicate either that the amount of depression is intermediate between being maximum.

FIG. 10 is a flowchart illustrating an example of the generation process of the control signal 3 according to the second embodiment. In FIG. 10, for convenience, the first switch 92 is referred to as “A” and the second switch 93 is referred to as “B”. In the damper pedal 90 according to the second embodiment, each switch can be in the following state.
(1) A off and B off (2) A on and B off (3) A on and B on From the state where the damper pedal 90 is not depressed at all until it is fully depressed, The state of the switch is in the order of (1), (2), (3). Further, until the damper pedal 90 is released from the fully depressed state, the state of the switch is in the order of (3), (2), (1).

  Therefore, by using the damper pedal according to the second embodiment, there is no depression (A off and B off) and the depression amount is maximum (A on and B on) according to the depression amount of the damper pedal. ) And that there is no depression, and that the depression amount is intermediate between the maximum depression amount (A on and B off).

  In the second embodiment, the CPU 14 selects the impulse response data 1 when the first switch 92 is in the off state (A off), and the first switch 92 is in the on state ( A control signal 2 for selecting the impulse response data 2 is generated when the A is ON, and is output to the impulse response memory reading circuit 41 of the convolution operation circuit 30.

  As shown in FIG. 10, the CPU 14 first clears the level of the coefficient included in the control signal 3 to “0” (step 1001). Next, the CPU 14 detects the state of each switch of the damper pedal 90 (step 1002). If “A is on and B is on”, the CPU determines whether the level is less than “100” (step 1003). If the level is less than “100” (step 1003). Yes), the level is increased by a predetermined value (step 1004).

  If the switch state is “A off and B off”, the CPU 14 determines whether or not the level is greater than “0” (step 1005). If the level is greater than “0” (Yes in step 1005), the CPU 14 decreases the level by a predetermined value (step 1006). When the switch state is “A on and B off”, the CPU 14 corresponds to either the level greater than “70”, equal to “70”, or less than “70”. It is determined whether to do so (step 1007). When the level is smaller than “70”, the CPU 14 increases the level by a predetermined value (step 1004). If the level is equal to “70”, that level is maintained. On the other hand, if the level is greater than “70”, the CPU 14 decreases the level by a predetermined value (step 1006).

  The control signal 3 including the coefficient level calculated by the processing of FIG. 10 is given to the multiplication circuit 31 of the resonance addition circuit 26.

  In the second embodiment, when the switch state is “A off, B off” to “A on, B off”, that is, when only one of the two switches is on, The level gradually increases by a predetermined value until reaching 70, which is 70% of the maximum value. Further, when the “A ON, B ON” state is reached, the level gradually increases by a predetermined value until the maximum value “100” is reached.

  On the other hand, when the “A ON, B ON” state is changed to the “A ON, B OFF” state, the level is incremented by a predetermined value until it reaches “70” which is 70% of the maximum value. Decrease gradually. Further, when the state becomes “A off, B off”, the level gradually decreases by a predetermined value until reaching “0”.

  According to the second embodiment, even if the damper pedal outputs not the signal indicating the depression amount but outputs the on / off states of a plurality of switches, The output signal from the convolution operation circuit is multiplied in accordance with a multiplication control signal including a coefficient that gradually decreases to a predetermined maximum value. Therefore, it is possible to generate an appropriate resonance sound according to the state of the switch.

  Further, according to the second embodiment, the signal indicating the depression amount of the damper pedal is one of the fact that there is no depression, the depression amount is maximum, and the depression amount between the two states. In the case of an intermediate depression amount, the multiplication coefficient to be multiplied with the resonance data gradually decreases or increases to a predetermined intermediate value between the minimum value and the maximum value. This makes it possible to obtain a finer level of resonance sound.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, in the first embodiment, as shown in FIG. 8, the resonance sound data based on the impulse response data 1 is the first level, and then the resonance body data based on the impulse response data 2 is the first level. The level increases as the amount of pedal depression increases until the level of 2 is reached, and when the level reaches the second level, the control remains constant at the second level even if the amount of pedal depression increases. Signal 3 is generated. However, the level of the control signal 3 is not limited to that shown in FIG.

  FIG. 11 is a graph for explaining the level of resonance data and the sound pressure level of musical sound waveform data multiplied by a multiplication circuit according to another embodiment of the present invention. As shown in FIG. 11, in another embodiment, the level of the resonance data is not fixed even when the impulse response data 1 is given to the convolution operation circuit 30 by the control signal 2 (see the solid line 1101). Without increasing, the pedal depression amount increases. Similarly, when the impulse response data 2 is given to the convolution operation circuit 30 by the control signal 2, it also increases as the pedal depression amount increases (see the broken line 1102). In this way, the resonance sound data that increases in accordance with the pedal depression amount is added to the musical sound waveform data (reference numeral 1103).

  In the example shown in FIG. 11, even when the resonance sound data is generated using either the impulse response data 1 or the impulse response data 2, the resonance sound data increases almost linearly as the pedal depression amount increases. A control signal 3 is generated. Therefore, regardless of the impulse response data, it is possible to reproduce a situation in which the level of the resonance sound changes almost linearly as the pedal is depressed.

FIG. 1 is a block diagram showing the configuration of the electronic musical instrument according to the first embodiment of the present invention. FIG. 2 is a block diagram showing an example of a sounding circuit, a resonance sound adding circuit, and constituent members of an electronic musical instrument related thereto according to the present embodiment. FIG. 3 is a block diagram showing a configuration example of the sound generation circuit and the waveform memory according to the present embodiment. FIG. 4 is a block diagram showing a configuration example of the convolution operation circuit and the impulse response memory of the resonance sound adding circuit according to the present embodiment. FIG. 5 is a graph for explaining the impulse response coefficient. FIGS. 6A and 6B are graphs showing examples of piano-type impulse response data 1 and piano-type impulse response data 2, respectively. FIG. 7 is a block diagram of a member that generates the control signal 3 according to the present embodiment. FIG. 8 is a graph for explaining the level of the resonance sound data multiplied by the multiplication circuit and the sound pressure level of the musical sound waveform data. FIG. 9 is a diagram illustrating an example of a damper pedal according to the second embodiment. FIG. 10 is a flowchart illustrating an example of the generation process of the control signal 3 according to the second embodiment. FIG. 11 is a graph for explaining the level of resonance data and the sound pressure level of musical sound waveform data multiplied by a multiplication circuit according to another embodiment of the present invention.

Explanation of symbols

10 Electronic musical instrument 12 Keyboard 14 CPU
16 ROM
18 RAM
DESCRIPTION OF SYMBOLS 20 Musical sound production | generation part 22 Operator group 24 Damper pedal 25 Sound generation circuit 26 Resonance sound addition circuit 27 Acoustic system 30 Convolution operation circuit 31 Multiplication circuit 32 Adder

Claims (5)

A resonance sound adding device for adding a resonance sound having a degree of resonance according to a depression amount of a damper pedal to musical sound waveform data,
Impulse response data composed of impulse response coefficients that are values on the time axis representing impulse response characteristics, based on first impulse response data including a set of impulse response coefficients and the first impulse response data A storage device storing second impulse response data including a set of impulse response coefficients having a greater degree of resonance than the resonance sound;
Resonance sound generating means having a convolution operation circuit that reads impulse response data stored in the storage device and performs a product-sum operation on a series of musical sound waveform data on the time axis and an impulse response coefficient included in the impulse response data And comprising
The resonance generating means selects the first impulse response data when the depression amount of the damper pedal is smaller than a predetermined threshold, and the second when the depression amount of the damper pedal is equal to or larger than the predetermined threshold. In response to the impulse response data control signal for selecting the impulse response data, the impulse response data is read from the storage device according to the impulse response data control signal,
Further, the resonance generating means is a constant value when the depression amount of the damper pedal is smaller than the predetermined threshold value, and when the depression amount of the damper pedal is larger than the predetermined threshold value, the value increases as the depression amount of the damper pedal increases. A multiplication circuit that multiplies the output signal from the convolution operation circuit in accordance with a multiplication control signal including an increasing coefficient, and the resonance sound data output from the multiplication circuit and the musical sound waveform data are added and output. A resonance sound adding device.   2. The resonance addition apparatus according to claim 1, wherein the coefficient is stored in a coefficient memory in a storage device. Resonance according to the amount of depression of the damper pedal that can output a signal indicating that there is no depression, that the amount of depression is maximum, or that the amount of depression is intermediate between the two states Resonance sound adding device for adding the resonance sound of the degree to the musical sound waveform data,
Impulse response data composed of impulse response coefficients that are values on the time axis representing impulse response characteristics, based on first impulse response data including a set of impulse response coefficients and the first impulse response data A storage device storing second impulse response data including a set of impulse response coefficients having a greater degree of resonance than the resonance sound;
Resonance sound generating means having a convolution operation circuit that reads impulse response data stored in the storage device and performs a product-sum operation on a series of musical sound waveform data on the time axis and an impulse response coefficient included in the impulse response data And comprising
The resonance generation unit causes the first impulse response data to be selected when the depression amount of the damper pedal indicates a predetermined first depression amount, and the depression amount is larger than the predetermined first depression amount. When an impulse response data control signal for selecting the second impulse response data is received when the second depression amount indicating the above is indicated, the impulse response is received from the storage device according to the impulse response data control signal. Read data,
Furthermore, when the signal indicating the depression amount of the damper pedal indicates that there is no depression, the resonance generation circuit gradually decreases to a predetermined minimum value and indicates that the depression is maximum. A multiplication circuit that multiplies the output signal from the convolution circuit according to a multiplication control signal including a coefficient that gradually increases to a maximum value, and the resonance sound data output from the multiplication circuit and the musical sound waveform data are added. The resonance sound adding device is characterized in that it is output. When the signal indicating the depression amount is the intermediate depression amount, according to a multiplication control signal including a coefficient that gradually decreases or increases to a predetermined intermediate value between the minimum value and the maximum value. 4. The resonance addition apparatus according to claim 3, wherein a multiplication circuit multiplies the resonance sound data. Resonant sound adding device according to any one of claims 1 to 4,
The keyboard,
A damper pedal that outputs a signal indicating the depression amount;
An electronic musical instrument comprising: a musical sound generating means for generating musical sound waveform data of a pitch of a pressed key among keys constituting the keyboard.

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