JPH10293578A - Resonant sound signal forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a resonant sound closer to a natural musical instrument by providing a control means for generating a resonant sound signal with an amplitude smaller than a prescribed level and larger than a specified value in a resonant sound generating means when the maintenance of the resonant sound signal is not designated by a resonant sound holding operator. SOLUTION: A resonant level control means 7 generates a resonant sound control coefficient for giving the strength of a musical signal inputted to the respective resonant sound forming channels (20-1)-(20-m) depending upon the ON/OFF state of a sustain pedal and the depressing/releasing keys of a keyboard. For example, when the sustain pedal is turned on, all resonant sound control coefficients of the resonant sound forming channels (20-1)-(20-m) are set as 1 and the resonant sounds of strings corresponding to all keys are generated. By setting other resonant sound control coefficients zero, only the resonant sound of string corresponding to the depressed key is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an electronic musical instrument,
In particular, the present invention relates to an electronic musical instrument that electrically realizes a resonance effect in a natural musical instrument provided with a resonance device having a plurality of strings and a sound board, such as a piano.

[0002]

2. Description of the Related Art A piano of a natural musical instrument is provided with a string and a hammer corresponding to each key, and the hammer strikes and vibrates the string in accordance with a key pressing operation. Each string has a damper,
When the key is pressed, the damper separates from the string, and when the key is released, the damper contacts the string. Also, a separate sustain pedal (damper pedal) is provided, and when the sustain pedal is depressed, the dampers of all keys separate from the strings. Therefore, when the sustain pedal is depressed, the musical tone does not readily attenuate even if the key is released.

[0003] When a key in a state where the sustain pedal is depressed is pressed, the hammer strikes a string and vibrates. This vibration is transmitted to other strings via a frame or the like. If the transmitted vibration induces resonance vibration of the string, the string starts to vibrate even if the key is not hit, and generates a resonance sound. Proposals have also been made for electronic musical instruments to realize this resonance sound generation.

[0004] A conventional resonance sound generator (Japanese Patent Laid-Open No.
-121789) will be described with reference to FIG. FIG. 5 is a block diagram showing a basic configuration of a sound source and a resonance sound forming circuit of an electronic musical instrument according to a conventional example.

The tone generator 50 applies a desired tone to a tone signal having a pitch corresponding to a depressed key, and imparts an amplitude envelope corresponding to the state of the key depression, key release, and sustain pedal. The sound source 50 includes a plurality of tone signal forming channels 5.
1-1 to 51-n and an adder 52.
When a key is depressed, one tone signal forming channel 51-i is allocated to the depressed key by key depression allocating means (not shown). If a new key is depressed while all tone signal forming channels are generating tone signals, the tone signal channel with the longest elapsed time after key release or the tone signal with the most advanced attenuation is released. Then, processing such as assigning to a newly depressed key is performed.

The assigned tone signal forming channel 5
1-i forms and outputs a tone signal corresponding to the pitch of the depressed key. Each tone signal forming channel 51-1 to 51
−n is connected to the adder 52. The adder 52
The tone signals supplied from the tone signal forming channels 51-1 to 51-n are summed and output.

The resonance tone forming circuit 60 forms m resonance tone signals having different resonance frequencies based on the input tone tone signal, and adds the resonance tone signal to the original tone tone signal. The resonance sound formation circuit 60 includes m resonance sound formation channels 61-1 to 61-1.
61-m, and adders 65 and 66 are provided. To each of the resonance sound forming channels 61-1 to 61-m, a tone signal is supplied from the sound source 50, and a sustain signal SUS is supplied from the sustain pedal switch 70. The sustain signal SUS becomes “1” when the sustain pedal is depressed, and becomes “0” when the sustain pedal is released.

Each resonance sound forming channel is provided with an adder 62,
This is a comb filter having a circulating signal path including a multiplier 63 and a delay circuit 64. The adder 62 adds the output of the delay circuit 64 to the tone signal supplied from the sound source 50 and supplies the resultant to the multiplier 63.

The multiplier 63 adds a predetermined feedback gain to the tone signal supplied from the adder 62 and supplies the tone signal to the delay circuit 64. This feedback gain can be set to a desired value by control means not shown.
The output of the multiplier 63 forms the output of the resonance sound forming channel and is input to the adder 65. The sustain signal SUS is supplied to the multiplier 63 from the sustain pedal switch 70 in addition to the tone signal from the adder 62.
When the sustain signal SUS is “1”, that is, when the sustain pedal is depressed, the multiplier 63
Provides a preset feedback gain. When the sustain signal SUS is “0”, that is, when the depression of the sustain pedal is released, the multiplier 6
The feedback gain of 3 becomes 0, and the output of the resonance tone forming channel becomes 0.

The delay circuit 64 delays the signal supplied from the multiplier 63 by a predetermined time and supplies the delayed signal to the adder 62. The delay time can be set to a desired value by control means not shown. By setting the delay time to an appropriate value, the resonance frequency of the comb filter can be set to a desired value.

By supplying a tone signal from the sound source 50 to each of the resonance sound forming channels 61-1 to 61-m thus configured, each of the resonance sound forming channels 61-1 to 61-m is provided.
A resonance sound having a unique resonance frequency can be formed every 61-m.

The adder 65 is connected to each resonance sound forming channel 6.
The resonance signals supplied from 1-1 to 61-m are summed up,
It is supplied to the adder 66. The adder 66 adds the resonance signal supplied from the adder 65 to the tone signal supplied from the sound source 50 and supplies the resultant signal to the sound system 67.

The sound system 67 performs D / A conversion of the musical tone signal supplied from the resonance tone generating circuit 60 to generate an acoustic signal.

[0014]

In the resonance generating circuit as shown in FIG. 5, an effective resonance can be generated when the sustain pedal is depressed. But,
When the depression of the sustain pedal is released, no resonance sound is generated. For example, in a natural musical instrument such as a piano, when a key is depressed in a normal performance, even when the damper pedal is not depressed, strings corresponding to keys other than the depressed key slightly resonate, and a resonance sound may be generated. In the conventional resonance generating circuit as shown in FIG. 5, a slight resonance generated when the sustain pedal is not depressed cannot be generated. Further, for example, a natural musical instrument such as a piano performs an operation of instructing addition of a resonance sound such as depression and release of a sustain pedal. At the time of the instruction operation, a resonance sound such as a noise sound such as a generated pedal depression sound may be generated. In the resonance signal forming circuit as shown in FIG.
The resonance sound is formed only from the tone signal, and does not take into account a waveform signal for the resonance sound such as a noise sound.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to generate a slight resonance sound that occurs when the sustain pedal is not depressed, or to generate noise such as noise sound. It is an object of the present invention to provide a resonance signal forming apparatus capable of generating a resonance sound closer to a natural musical instrument by generating a resonance sound by a waveform signal other than a simple tone signal.

[0016]

In order to achieve the above object, a resonance signal forming apparatus according to the present invention can specify a pitch of a tone signal to be generated, and generate a tone signal of the designated pitch. Pitch designation means for instructing pronunciation and mute,
Tone signal forming means for forming and outputting a tone signal having a pitch designated by the pitch designating means; resonance tone generating means capable of receiving the tone signal and forming and outputting a resonance tone signal; A resonance sound holding operator for designating the holding of the resonance signal, and when the holding of the resonance sound is designated by the resonance sound holding operator, the resonance sound generation means generates the resonance sound signal with a predetermined level of amplitude. Control means for generating a resonance sound signal with an amplitude smaller than the predetermined level and larger than 0 in the resonance sound generation means, when holding of the resonance sound signal is not designated by the resonance sound holding operator. Having. According to the resonance signal forming apparatus having the above-described configuration, the resonance sound holding operation element for designating the holding and release of the holding of the resonance sound signal formed by the resonance sound generating means is provided, and the holding of the resonance sound is designated. Generates a resonance signal with a predetermined level of amplitude,
When the holding of the resonance signal is not specified, the resonance signal having an amplitude smaller than the predetermined level and larger than 0 is generated to generate a resonance sound that is slightly generated when the damper is not separated from the string. It is possible to do.

Further, according to the present invention, there is provided a resonance signal forming apparatus, comprising: a pitch specifying means for specifying pitches of a plurality of tone signals to be generated; and a musical tone corresponding to the pitch specified by the pitch specifying means. Tone signal forming means for forming and outputting a signal;
Waveform signal forming means for forming a waveform signal for forming a resonance signal, and a resonance sound having different resonance frequency characteristics and capable of receiving the tone signal and the waveform signal and forming and outputting a resonance signal Generating means. According to the resonance sound signal forming apparatus having the above-described configuration, by providing the waveform signal forming means for forming a waveform signal for forming a resonance sound signal separately from the music sound signal, resonance by a sound other than the music sound signal such as a noise sound is provided. Sound can also be generated.

[0018]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 is a block diagram of an electronic musical instrument according to an embodiment of the present invention. A keyboard 10 is connected to the bus 8 via a keyboard interface 11. Keyboard 1
When there is a key press or key release of 0, the keyboard interface 11
Detects the pitch of the corresponding key, key depression or key release, key depression (key release) speed, after touch information, etc., and supplies each data to the bus 8.

The pedal 12 has a pedal interface 13
Is connected to the bus 8 via the. The pedal interface 13 detects the on / off state of the sustain pedal or the sostenuto pedal of the pedal 12 and supplies the on / off information of each pedal to the bus 8.

Further, the bus 8 includes a ROM 14 and a RAM.
15, a CPU 16, a sound source 50, and a resonance sound forming circuit 60 are connected. In accordance with the program stored in the ROM 14, the CPU 16 generates the sound source 50 and the resonance sound forming circuit 6 based on the key release information from the keyboard interface 11 and the pedal on / off information from the pedal interface 13.
Control 0.

The sound source 50 includes a plurality of tone signal forming channels 51-1 to 51-n and an adder 52. Sound source 50
Assigns a desired tone to a tone signal having a pitch corresponding to a depressed key, and imparts an amplitude envelope corresponding to the state of the key depression, key release, and sustain pedal. When the key is depressed, one tone signal forming channel 5 is
1-i is assigned to the generation of a depressed musical tone. If a new key is pressed while all the tone signal forming channels are generating tone signals, the tone signal forming channels such as the tone with the longest elapsed time after the key release and the tone with the most attenuation are released. Then, a truncation process such as assigning to a newly depressed key is performed.

The assigned tone signal forming channel 5
1-i forms and outputs a tone signal corresponding to the pitch of the depressed key. Each tone signal forming channel 51-1 to 51
−n is connected to the adder 52. The adder 52
The tone signals supplied from the tone signal forming channels 51-1 to 51-n are summed and supplied to the resonance tone forming circuit 60.

The resonance sound forming circuit 60 adds a resonance sound to the tone signal input from the sound source 50 and
7 The configuration and operation of the resonance generating circuit 60 will be described later in detail. The sound system 67 performs D / A conversion of a tone signal input from the resonance sound forming circuit 60, and generates an acoustic signal.

FIG. 1 is a block diagram of the resonance generating circuit 60 of FIG. The input 9 is supplied with the output of the sound source 50 shown in FIG. A sound for resonance is supplied to the input 9a. For example, it is a noise component when the sustain pedal is turned on. The tone signals input from the inputs 9 and 9a are supplied to the adder 1 via the multipliers 5 and 4, respectively. The output of the adder 1 is a plurality of multipliers 21-1 to 21-21.
-M.

The multipliers 21-1 to 21-m multiply the tone signal input from the adder 1 by a predetermined coefficient, and supply the result to the resonance tone forming channels 20-1 to 20-m. Further, the multipliers 21-1 to 21-m are connected to the resonance level control means 7, and the coefficients to be multiplied by the tone signal are supplied from the resonance level control means 7 based on the pitch information of the generated tone. Is done.

Resonant sound forming channels 20-1 to 20-m
Form a resonance sound unique to the string corresponding to each key. Therefore, it is preferable that the number of resonance sound forming channels be equal to the number of keys. However, when it is difficult to provide all the keys, only a part of the keys may be used as described in more detail later. For example, a total of 24 octaves for high and low frequencies
A plurality of resonance sound forming channels may be provided.

One resonance tone forming channel 20-i
Constitutes a circulating signal path including an adder 22-i, a delay circuit 23-i, a read control means 24-i, and a multiplier 25-i,
A comb filter is formed. The adder 22-i is connected to the multipliers 21-i and 25-i. The adder 22-i adds the tone signals input from each of the multipliers and supplies the result to the delay circuit 23-i.

The delay circuit 23-i delays the musical tone signal supplied from the adder 22-i by a predetermined time and supplies it to the read control means 24-i. The delay time is set so as to give the natural resonance frequency of the string of the key corresponding to the resonance forming channel 20-i. Read control means 24-i
Reads the tone signal delayed by a predetermined time by the delay circuit 23-i, performs interpolation or phase correction, and
-I.

The multiplier 25-i is provided with a read control means 24-i.
Multiplied by a predetermined coefficient to the tone signal supplied from the adder 22
-I. That is, the multiplier 25-i gives the feedback gain of the comb filter. Further, the output of the multiplier 25-i is supplied to the resonance forming channel 20-i.
, And is provided to multipliers 26-ia and 26-ib.

The multipliers 26-ia and 26-ib multiply the tone signal supplied from the resonance signal forming channel 20-i by a predetermined coefficient and supply them to adders 2a and 2b, respectively. The multiplier 26-ia forms a resonance corresponding to the left channel, and the multiplier 26-ib forms a resonance corresponding to the right channel. By appropriately selecting the coefficients of the multipliers 26-ia and 26-ib, the mixing ratio of the left and right channels, and thus the localization, can be set independently for each resonance tone corresponding to each string.

The adders 2a and 2b are connected to the multiplier 2
6-1a to 26-ma and multipliers 26-1b to 26-m
b, and the outputs of the respective multipliers are summed and supplied to the adders 3a and 3b.

The multipliers 6a and 6b multiply the tone signal input from the input 9 by a predetermined coefficient, and add
And 3b. The adder 3a adds the tone signal supplied from the multiplier 6a and the left-channel resonance signal supplied from the adder 2a to form a left-channel tone signal to which a resonance is added. The adder 3b includes a multiplier 6
The tone signal supplied from the adder 2b is added to the tone signal supplied from the adder 2b to form a tone signal for the right channel to which a resonance is added.

The resonance level control means 7 controls each resonance tone forming channel 2 according to the on / off state of the sustain pedal and the sostenuto pedal, and the depressed / released state of each key of the keyboard.
A resonance tone control coefficient for giving the intensity of the tone signal inputted to 0-1 to 20-m is generated. The coefficients are supplied to multipliers 21-1 to 21-m that supply a tone signal to each of the resonance forming channels 20-1 to 20-m.

For example, when the sustain pedal is on, all the resonance control coefficients of the resonance forming channels 20-1 to 20-m are set to 1, and the resonances of the strings corresponding to all the keys are generated. At this time, the coefficient may have a distribution in consideration of the distance between the string corresponding to the key depression and the resonance string.

When the sustain pedal is off, the resonance tone control coefficient of the resonance tone formation channel corresponding to the key being depressed is set to 1, and the other resonance tone control coefficients are set to 0, thereby depressing the key. It is possible to generate only the resonance sound of the string corresponding to the key being played.

Other settings may be made. For example, the resonance control coefficient is 0.8 when the key is pressed, 0 when the key is released, 0.9 when the sustain pedal is on, and 0 when the key is released.
It may be 6.

Next, the operation of the electronic musical instrument and the resonance sound forming circuit shown in FIGS. 1 and 2 will be described with reference to FIGS. FIG. 6 is a flowchart showing the main routine. When the power is turned on, initialization of each device is performed in step A1. Thereafter, the keyboard processing of step A2, the pedal processing of step A3, and the other processing of step A4 are repeatedly executed.

FIG. 7 is a flowchart showing the keyboard processing in step A2 of FIG. When the keyboard processing is started from the main routine, it is determined in step B1 whether or not a key is pressed in the current cycle. If there is no key depression, the process proceeds to a process of determining whether or not a key is released in step B6.

If there is a key press in this cycle, step B
2 is executed. In the sound generation process, the CPU 16 transmits one tone signal forming channel 51- to each depressed key.
j is assigned, and a tone generation instruction is given to the assigned tone signal forming channel 51-j.

Next, in step B3, it is determined whether the sustain pedal is on or off. When the sustain pedal is on, the dampers of all keys are separated from the strings and are in a state of being able to resonate.
However, there is a difference in the strength of resonance between when a near key is hit and when a far key is hit.

Therefore, in step B5, the CPU 16 inputs a tone signal to the resonance sound forming channel in accordance with the key depressed via the resonance level control means 7 by a multiplier (hereinafter referred to as a multiplier).
A resonance control coefficient for key depression when the sustain pedal is turned on is set in a resonance gate 21-i.

Typically, a resonance sound control coefficient is set such that the opening of the resonance sound gate decreases as the distance from the keyed position increases. Thereby, the resonance sound forming channel 2
0-i electronically generates a resonance sound in which a string is generated in response to a key depression when the sustain pedal is turned on.

When the sustain pedal is off, only the damper of the key being depressed leaves the string and can resonate. Therefore, in step B4, the CPU 16 sets, via the resonance level control means 7, only the resonance sound gate 21-i corresponding to the depressed key to the resonance sound control coefficient for key depression when the sustain pedal is off. Thus, the resonance sound forming channel 20-i electronically generates a resonance sound generated by a string corresponding to the key pressed when the sustain pedal is off. Since the strings of the keys that are not depressed can also slightly resonate, the resonance gate of the keys that are not depressed may be slightly opened.

Next, in step B6, the presence or absence of a key release is determined. If there is no key release in the current cycle, the process returns to the main routine without doing anything. If there is a key release in the current cycle, the mute processing of step B7 is executed. In the silencing process, the CP
U16 instructs the tone signal forming channel 51-1 corresponding to the released key to apply a mute amplitude envelope. At this time, if the sustain pedal is on, the mute processing is not performed until the sustain pedal is turned off.

After the mute processing, it is determined in step B8 whether the sustain pedal is on or off. When the sustain pedal is ON, the CPU 16 sends the sustain pedal to the resonance gate 21-k corresponding to the released key among the multipliers 21-1 to 21-m via the resonance level control means 7 in step B10. Sets the key release resonance control coefficient when the key is on.
Thus, the resonance sound forming channel 20-k electronically generates a resonance sound generated by a string corresponding to the key released when the sustain pedal is turned on.

When the sustain pedal is off, the CPU 16 passes through the resonance level control means 7 in step B9.
The key release resonance control coefficient when the sustain pedal is off is set in the resonance gate 21-k corresponding to the released key. Thus, the resonance sound forming channel 20-k electronically generates a resonance sound generated by a string corresponding to the key released when the sustain pedal is off. At this time, the resonance sound control coefficient may be set to 0 so that the resonance sound corresponding to the released key is not generated.

When the above processing is completed, the control returns to the main routine. FIG. 8 is a flowchart showing the pedal process.
When the pedal process is started from the main routine, it is determined in step C1 whether or not the sustain pedal has been depressed in the current cycle. If the sustain pedal is not depressed,
The process proceeds to a process of determining whether or not the sustain pedal has been released in step C4.

When the sustain pedal is depressed in this cycle, the process of turning on the sustain pedal in step C2 is executed. In the process of turning on the sustain pedal, the CPU 16
Stores the sustain pedal on state. When the sustain pedal is on, the mute processing is not performed immediately after the key release is detected, and the mute processing is performed after the sustain pedal is turned off.

Next, in step C3, the resonance tone control coefficient for key depression while the sustain pedal is on is set in the resonance tone gate corresponding to the key being depressed, and the resonance tone gate corresponding to the key being released is set. , A resonance control coefficient for key release when the sustain pedal is on is set. Thus, each resonance sound forming channel generates a resonance sound when the sustain pedal is turned on.

Next, in step C4, it is determined whether or not the sustain pedal has been released in the current cycle. If the sustain pedal has not been released, the current state is maintained and control returns to the main routine.

If the sustain pedal is released in this cycle, the process of turning off the sustain pedal in step C5 is executed. In the process of turning off the sustain pedal, the CPU 16
Stores the sustain pedal off state. At the same time, a mute process corresponding to a key released while the sustain pedal is on is executed.

Next, in step C6, the resonance tone control coefficient for key depression during the sustain pedal off is set to the resonance tone gate corresponding to the key being depressed, and the resonance tone gate corresponding to the key being released is set. , A key release resonance control coefficient during sustain pedal off is set. Thus, each resonance sound forming channel generates a resonance sound when the sustain pedal is off. If the key release resonance sound control coefficient during the sustain pedal off is set to 0, the resonance sound forming channel corresponding to the key release key stops generating the resonance sound.

After executing the above processing, the control is returned to the main routine. In FIGS. 7 and 8, only the sustain pedal is considered as the pedal processing for the sake of simplicity of description. However, when the sostenuto pedal is depressed, the damper of the depressed key is released, and the This is the same as pressing the sustain pedal. Therefore, a case in which a sostenuto pedal is considered will be described below.

In the pedal processing in step A3 of FIG.
Stores the sostenuto pedal on state. When the sostenuto pedal is on, the key being pressed is stored in the storage buffer. If the released key is stored in the storage buffer in the process of step B7 in FIG. 7 when the key release is detected, the mute processing is also performed to reset the resonance control coefficient to the corresponding resonance gate. Also do not. If the released key is not stored in the storage buffer, normal silencing processing and resetting of the resonance control coefficient to the resonance gate are performed. As a result, when the sostenuto pedal is on, the corresponding resonance sound forming channel generates the same resonance sound as when the key is pressed, even if the key is released.

When the sostenuto pedal off is detected in the pedal processing of step A3 in FIG.
Reference numeral 16 stores a sostenuto pedal off state. Further, for a key that has already been released from the keys stored in the storage buffer, a silencing process is executed, and a key release resonance control coefficient is set in a resonance gate corresponding to the key. At the same time, the storage buffer is cleared. As a result, the resonance forming channel corresponding to the key released while the sostenuto pedal is on stops generating resonance.

As described above, in the present embodiment, even when the sustain pedal is off, the resonance sound of the string corresponding to the key being depressed can be generated electronically. Furthermore, by appropriately selecting the resonance control coefficient in accordance with the on / off state of the sustain pedal and the state of key depression / release, a resonance sound closer to a natural musical instrument can be generated.

For example, the key C1 (do) and G1 of the piano
Consider the case where the keys of (S) are pressed at the same time. The frequency of the sound of C1 is 32.7 Hz, the frequency of the sound of G1 is 49 Hz, and the ratio is about 2: 3. The third overtone of C1 is 9
The second overtone of 8.1 Hz and G1 is 98 Hz, which is almost equal. Therefore, the string corresponding to C1 resonates with the second harmonic, fourth harmonic, etc. of G1. According to the present embodiment, when the C1 key and the G1 key are depressed simultaneously without depressing the sustain pedal, the above-described resonance between the C1 string and the G1 string is compared with the natural musical instrument. This can occur as well.

In the above embodiment, the resonance sound forming circuit provided with the resonance sound forming channels corresponding to all keys has been described. However, if the resonance sound forming channels corresponding to all keys are provided, the number of channels is increased and the circuit becomes complicated. Become. In order to simplify the circuit, a resonance sound forming channel for one octave may be provided for each of the high band and the low band. Hereinafter, a resonance tone generating circuit according to a second embodiment will be described with reference to FIG.

FIG. 3 is a block diagram of a resonance sound forming channel in the case where one octave resonance sound forming channel is provided for each of the high band and the low band. Twelve resonance sound forming channels 20-1 to 20-12 for low frequencies,
Twelve 20-13 to 20-24 are provided for high frequencies.

The process until the tone signal inputted from the inputs 9 and 9a is inputted to the adder 1 is the same as that of the resonance signal forming circuit shown in FIG. The output side of the adder 1 is a multiplier 17a,
17b and supplies a tone signal. Multiplier 17a
And 17b supply a tone signal to the resonance gates 21-1 to 21-12 of the low-frequency resonance channel and the resonance gates 21-13 to 21-24 of the high-frequency resonance channel. . When the sound source is a stereo sound source, the tone signal for the left channel is input to the resonance sound gates 21-1 to 21-12 of the low-frequency resonance sound formation channel,
The tone signal for the right channel may be inputted to the resonance gates 21-13 to 21-24 of the high-frequency resonance sound forming channel. This corresponds to the low frequency string of the piano being on the left and the high frequency string being on the right.

The configurations of the resonance signal gate 21-i, the resonance signal forming channel 20-i, and the multipliers 26-ia and 26-ib are the same as those of the resonance signal forming circuit of FIG. Each multiplier 26-
Outputs of ia and 26-ib are supplied to adders 2a and 2b, respectively.

The adders 2a and 2b are connected to the multiplier 1
A tone signal is supplied to 8a and 18b. Adder 3
a and 3b add the tone signal input from the multipliers 6a and 6b and the resonance signal input from the multipliers 18a and 18b, respectively, and form and output a tone signal to which a resonance is added.

The resonance level control means 7 controls the low-frequency resonance sound forming channel 20 according to the on / off state of the sustain pedal and the sostenuto pedal, and the key depression / release state of the keyboard.
-1 to 20-12 and high frequency resonance sound forming channel 20
A resonance control coefficient to be applied to the resonance gates of -13 to 20-24 is generated.

In a resonance sound forming circuit as shown in FIG. 3, there is a case where there is no resonance sound formation channel corresponding to a key that has been depressed. In this case, an appropriate resonance control coefficient is set for each of the resonance gates of the high-frequency resonance sound formation channel and the low-frequency resonance sound formation channel corresponding to the sound of the depressed key. A resonance sound corresponding to the generated key is generated in a pseudo manner.

For example, one octave of pitch names C1 to B1 is used as a low-frequency resonance sound forming channel, and one octave of pitch names C5 to B5 is used as a high-frequency resonance sound forming channel.
Consider a case where octaves are prepared. At this time, it is possible to adjust the resonance control coefficient of each resonance gate in the following manner in accordance with the key pressed.

When the key corresponding to C1 is pressed,
The resonance control coefficient of the resonance gate 21-1 of the resonance forming channel for the low frequency band corresponding to C1 is set to 1, and the resonance gate 21-13 of the resonance forming channel for the high frequency corresponding to C5 is set to 1. Set the resonance control coefficient to 0.

Conversely, when the key corresponding to C5 is depressed, the resonance control coefficient of the resonance gate 21-1 of the low-frequency resonance-tone forming channel corresponding to C1 is set to 0,
The resonance control coefficient of the resonance gate 21-13 of the high-frequency resonance generation channel corresponding to C5 is set to 1.

When the key corresponding to C3 is depressed, the resonance gates 21-1 of the low-frequency resonance-tone forming channel corresponding to C1 and the high-frequency resonance tone corresponding to C5 are formed. The resonance control coefficients of the resonance gates 21-13 of the channels are both set to 0.5.

Even when other keys are depressed, adjustment is made so as to obtain an optimum resonance sound by changing the ratio of the resonance sound control coefficients set in the corresponding resonance sound gates for the low band and the high band. Is preferred.

As described above, the resonance generating circuit according to the second embodiment does not need to include the resonance generating channels for all keys, and can simplify the electronic circuit. Also,
By appropriately selecting the resonance control coefficients for the high band and the low band, it is possible to generate a resonance sound close to the resonance sound corresponding to each key.

Next, a third embodiment will be described with reference to FIG. In an actual piano, the hammer strikes a string at about 1/7 to 1/9 of the string length from one end of the string. Therefore, about 1/7 of the string length from one end of the string
A standing wave in which the 1/9 position is a node is unlikely to occur.
This means that 7 to 9 harmonics of the fundamental resonance frequency of the string are hardly generated. The third embodiment shown in FIG.
This is an example in which each resonance sound forming channel is provided with a band rejection filter for blocking passage of a band corresponding to 7 to 9 harmonics of the fundamental resonance frequency.

The operation until the tone signal is input from the inputs 9 and 9a and input to the respective resonance tone forming channels 20-1 to 20-24 is the same as that of the second embodiment shown in FIG. Also,
The adder 22-i, the delay circuit 23-i, the readout control means 24-i, and the multiplier 25- of the resonance sound forming channel 20-i.
The circulating signal path consisting of i is the same as the resonance signal forming channel of the second embodiment shown in FIG. The difference is that the output of the multiplier 25-i is connected to the band reject filter 27-i, and the output of the band reject filter 27-i forms the output of the resonance forming channel 20-i. As a result, the generation of the seventh to ninth harmonics of the fundamental resonance frequency of each resonance sound forming channel is suppressed, and it is possible to obtain a resonance sound closer to the resonance sound of an actual piano.

In the above example, the case where a band rejection filter is used has been described. However, a low-pass filter that blocks frequencies equal to or higher than the seventh harmonic may be used. The outputs of the low-frequency resonance forming channels 20-1 to 20-12 are summed and supplied to multipliers 28a and 28b. The outputs of the high-frequency resonance sound forming channels 20-13 to 20-24 are added together and supplied to the multipliers 29a and 29b. The outputs of the multiplier 28a and the multiplier 29a are added by the adder 2a to form a left-channel resonance signal. The outputs of the multiplier 28b and the multiplier 29b are added by the adder 2b to form a right-channel resonance signal.

In the second embodiment shown in FIG. 3, the output of each resonance sound forming channel is separated into left and right resonance sound signals and input to the adder 2a or 2b via separate left and right multipliers. However, in the present embodiment, the outputs of the respective resonance tone forming channels are added and then input to the left and right channel multipliers. Therefore, interference between the left and right resonance sound forming channels can be taken. Further, the number of multipliers can be reduced, and the electronic circuit can be simplified.

In the case where the strings that generate low-frequency sounds are on the left side and the strings that generate high-frequency sounds are on the right side like a piano, a low-frequency resonance sound forming channel is generated. When separating the resonance signal into left and right channels, it is preferable to make the left channel stronger and the right channel weaker.
Conversely, when separating the resonance signal generated by the high-frequency resonance-tone forming channel into left and right channels, it is preferable that the left channel is weak and the right channel is strong. Therefore, by summing the outputs of the low-frequency and high-frequency resonance sound forming channels as in the present embodiment, and separating the left and right channels to give independent volumes, an effective resonance sound can be obtained. Can occur.

The present invention has been described in connection with the preferred embodiments.
The present invention is not limited to these. For example, it will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made. For example, the output may be obtained from an arbitrary portion of the loop circuit, such as the result of addition of the adder 22-i.

Although the gist of the present invention is as described in the claims, the features of the present invention also exist in the following. [A] The resonance sound generating means includes a comb filter which forms a circulating signal path including an adder for injecting a mixed tone signal, a delay circuit, and a feedback gain applying means. The electronic musical instrument according to claim 1.

[B] The electronic musical instrument according to claim 1 or A, wherein the plurality of resonance sound generating means each have a resonance frequency corresponding to a pitch that can be specified by the pitch specifying means. .

[C] The plurality of resonance sound generating means are provided only for one low octave and one high octave which can be specified by the pitch specifying means. The electronic musical instrument according to claim 1 or AB.

[D] Left channel mixing means and right channel mixing means provided on the output side of the plurality of resonance sound generating means for mixing a plurality of tone signals generated from the plurality of resonance sound generating means, A pair is provided between an output side of the plurality of resonance sound generating means and an input side of the left channel mixing means and the right channel mixing means, respectively.
Adjusting the volume level of the tone signal for each of the resonance sound generating means, one for the left channel mixing means, and the other for providing the adjusted tone signal to the right channel mixing means; The electronic musical instrument according to any one of claims 1 or A, B, or C, wherein the electronic musical instrument has the following.

[E] The plurality of resonance sound generating means further includes a band rejection filter for reducing only unnecessary frequency components from the resonance sound. Electronic musical instrument according to any one of the above items.

[F] The electronic musical instrument according to item E, wherein the band rejection filter is a filter for blocking passage of 7 to 9 harmonics of the fundamental frequency of the resonance sound. [G] A tone signal to be generated by the pitch designation means is designated, a plurality of tone signals having different pitches designated by the pitch designation means are formed and output, and the tone signal has a plurality of resonance frequency characteristics. To the resonance sound generating means at a level selected for each of the resonance sound generating means in accordance with the pitch of the musical sound signal to be generated, and forming and outputting a plurality of different resonance sound signals based on the input musical sound signal Sound generation method.

[H] The musical tone signal is supplied only to the resonance tone generating means corresponding to the pitch of the musical tone to be generated, and the tone signal is not supplied to the other resonance tone generating means. How to generate resonance.

[I] When it is desired to maintain the generated tone, the tone is supplied to the resonance generating means corresponding to the pitch of the tone to be generated, and the volume level is lowered to the other resonance generating means. A method for generating a resonance tone according to item G, wherein a tone is supplied.

[0085]

As described above, according to the present invention,
It is possible to generate a slight resonance tone even for a key that is not depressed in the resonance tone signal forming device, or to generate a resonance tone due to a sound other than a tone signal such as a noise sound. Can generate sound.

[Brief description of the drawings]

FIG. 1 is a block diagram of a resonance generating circuit according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a basic configuration of the electronic musical instrument according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a resonance generating circuit according to a second embodiment of the present invention.

FIG. 4 is a block diagram of a resonance generating circuit according to a third embodiment of the present invention.

FIG. 5 is a block diagram of a sound source and resonance sound forming circuit according to a conventional example.

FIG. 6 is a flowchart of a main routine according to the first embodiment of the present invention.

FIG. 7 is a flowchart of keyboard processing according to the first embodiment of the present invention.

FIG. 8 is a flowchart of a pedal process according to the first embodiment of the present invention.

[Explanation of symbols]

1, 2a, 2b, 3a, 3b, 22-i, 52, 62,
65, 66 adders; 4, 5, 6a, 6b, 17a, 1
7b, 18a, 18b, 21-i, 25-i, 26-i
a, 26-ib, 28a, 28b, 29a, 29b, 6
3 multiplier; 7 resonance level control means; 8 bus;
9, 9a input; 10 keyboards; 11 keyboard interface; 12 pedals; 13 pedal interface; 14 ROM; 15 RAM;
20-i resonance forming channel; 23-i, 64
Delay circuit; 24-i read control means; 27-i
Band rejection filter; 50 sound source; 51-i musical tone forming channel; 60 resonance generating circuit;
Resonance forming channel; 67 sound system;
70 Sustain pedal switch

Claims (2)

[Claims] 1. A pitch designation means for designating the pitch of a tone signal to be generated, and instructing the tone signal of the designated pitch to be sounded and muted, and a tone designated by the pitch designation means. Tone signal forming means for forming and outputting a high tone signal; resonance tone generating means capable of receiving the tone signal and forming and outputting a resonance signal; and designating holding of the formed resonance signal. A resonance holding operator, wherein when the resonance holding is designated by the resonance holding operator, the resonance generating means generates a resonance signal at a predetermined level of amplitude in the resonance generating means, If the retention of resonance signal is not specified by
Control means for generating a resonance signal with an amplitude smaller than the predetermined level and larger than 0 in the resonance sound generating means. 2. A pitch specifying means for specifying a pitch of a plurality of tone signals to be generated; a tone signal forming means for forming and outputting a tone signal corresponding to a pitch specified by the pitch specifying means; A waveform signal forming means for forming a waveform signal for forming a resonance signal; and a resonance sound having different resonance frequency characteristics, capable of receiving the tone signal and the waveform signal and forming and outputting a resonance signal. A resonance signal forming apparatus having a generating unit.