JP4032208B2 - Key information processing apparatus and key information processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a key information processing apparatus and a key information processing method suitable for use in an electronic musical instrument.
[0002]
[Prior art]
Conventionally, a key information processing apparatus that controls to raise or lower a pitch of a stem tone corresponding to a specified key among key information (pitch) generated in response to a key operation. This type of technology is disclosed in, for example, Japanese Patent Application Laid-Open No. 58-102992.
[0003]
[Problems to be solved by the invention]
By the way, the technique described above is to change the place where the black key should be played to the key operation of the white key so that even a user unfamiliar with the key operation can easily play it. There is a problem that various performance expressions cannot be performed, such as performances with mixed sounds and performances with harmony sounds.
Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a key information processing apparatus and a key information processing method that can easily realize various performance expressions even for a user who is not familiar with key operations. It is said.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, in the invention described in claim 1,In response to the key being pressed, a decorative sound having a decorative pitch having a pitch difference between the pitch specified by the pressed key and a set frequency is generated and generated for a predetermined period. And a key-pressing sound generation unit for generating a key-pressing sound having a pitch specified by the pressed key after a decoration sound is generated for a predetermined period by the first decoration-sound generating unit. And, in response to the key-pressed sound being generated, a pitch having a predetermined pitch difference from a pitch specified by the key pressed is calculated, and the calculated pitch is preliminarily calculated. Harmony pitch generation means for generating a harmony pitch converted to fit a specified key, and a decorative pitch decoration sound having a pitch difference of a set frequency from the harmony pitch And a second decoration sound generating means for generating a sound for a predetermined period and a decoration by the second decoration sound generating means After There is a predetermined period of time to pronounce, and harmony sound generation means for sound to generate a harmony note having the tone pitch for the harmony,It is characterized by comprising.
[0005]
Claim5In the invention described inIn response to the key being pressed, a decorative sound having a decorative pitch having a pitch difference between the pitch specified by the pressed key and a set frequency is generated and generated for a predetermined period. A key-pressing sound generation process for generating a key-pressing sound having a pitch designated by the pressed key after a decoration sound is generated for a predetermined period in the first decorative sound generating process. In response to the process and the key-pressing sound being generated, a pitch having a predetermined pitch difference from the pitch specified by the pressed key is calculated, and the calculated pitch is Harmony pitch generation process for generating a harmony pitch converted to fit a specified key, and a decorative pitch decoration sound having a pitch difference of the set frequency from the harmony pitch And a second decoration sound generation process for generating a sound for a predetermined period of time and a decoration in the second decoration sound generation process After There is a predetermined period of time to pronounce, and harmony sound generation process to sound to generate a harmony note having the tone pitch for the harmony, theIt is characterized by comprising.
[0006]
In the present invention,In response to the key being pressed, a decorative sound of a decorative pitch having a pitch difference between the pitch specified by the pressed key and a set frequency is generated and generated for a predetermined period of time, After the decoration sound is generated for a predetermined period, a key pressing sound having a pitch designated by the pressed key is generated.
In response to the sound of the key depression, a pitch having a predetermined pitch difference from the pitch designated by the depressed key is calculated, and the calculated pitch is adjusted to a predetermined key. A tone pitch for harmony converted so as to be matched is generated, and a decoration tone having a pitch difference of a set frequency with the tone pitch for harmony is generated and generated for a predetermined period. After the decoration sound is generated for a predetermined period, a harmony sound having a pitch for harmony is generated and generated. For this reason,By pressing a single key, it is possible to generate decoration sounds and harmony sounds that are suitable for tonality, so that even a user unfamiliar with key operations can easily realize a variety of performance expressions. .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an electronic musical instrument equipped with a key information processing apparatus according to an embodiment of the present invention will be described as an example with reference to the drawings.
[0008]
(1) Configuration
FIG. 1 is a block diagram showing a configuration of an electronic musical instrument according to an embodiment of the present invention. In this figure, reference numeral 1 denotes a panel switch group disposed on the musical instrument panel, which generates a switch event signal corresponding to each switch operation.
Although not shown in the figure, the panel switch group 1 is a decoration sound addition switch for setting the number of semitones away from the key pressing sound upward or downward, and a harmony for the key pressing sound. A harmony sound addition switch that specifies whether or not to add sound, a scale selection switch that selects whether to use a diatonic scale or an Arabic scale, which will be described later, a key specification switch that specifies a key, etc. Yes. Reference numeral 2 denotes a keyboard that generates key information including a note-on / note-off event, a key number KN, a velocity, and the like corresponding to a key release / release operation.
[0009]
Reference numeral 3 denotes a display unit composed of an LCD panel or the like, which displays a setting state, an operation mode, and the like of each part of the musical instrument in accordance with a display control signal supplied from a CPU 4 described later. The CPU 4 sets the operation state of each part of the musical instrument based on the switch event generated in response to the switch operation, or generates a command (for example, a sound generation instruction command or a mute instruction command) according to the key information from the keyboard 2. Send to sound source 7. A ROM 5 stores various control programs loaded on the CPU 4 and various data tables used for key information generation.
[0010]
Here, various data tables stored in the ROM 5 will be described with reference to FIGS.
FIG. 2A is a diagram showing the contents of the white key identification table TBL1 used when identifying whether the pressed key is a white key or a black key. In this table TBL1, the key depression sound i is made to correspond to twelve sounds (pitch names) in one octave key range. For example, the key depression sound i is a white key such as “0 (do)” or “2 (le)”. Corresponding to the identification data nSc [i] is “1”, while the key pressing sound i is equivalent to a black key such as “1 (do # sound)” or “3 (le # sound)”. In this case, the corresponding identification data nSc [i] is “0”.
[0011]
FIG. 2 (b) is a harmony pitch table TBL2 for designating a harmony pitch to be added corresponding to the key depression sound i. This table TBL2 is composed of nHr [0] [i] designating the first harmony sound and nHr [1] [i] designating the second harmony sound.
In nHr [0] [i] designating the first harmony sound, for example, if the key depression sound i is “0 (de)”, “mi” having a pitch relationship of 4 semitones (3 degrees long) from that. Specifies the harmony sound.
On the other hand, in the case of nHr [1] [i] designating the second harmony sound, for example, if the key depression sound i is “0 (de)”, the “so ”Is specified.
[0012]
FIG. 3 shows the contents of the diatonic scale table TBL3. This table TBL3 represents a pitch change corresponding to the key depression sound i for the diatonic scale for each key.
FIG. 4 shows the contents of the Arabic scale table TBL4. This table TBL4 represents a change in pitch corresponding to the key pressing sound i for the Arabic scale for each key.
[0013]
Next, the configuration of the embodiment will be described with reference to FIG. 1 again. In FIG. 1, reference numeral 6 denotes a RAM that temporarily stores various register / flag data used for the calculation of the CPU 4. Note that typical register / flag data stored in the RAM 6 will be described later in the description of operation.
The sound source 7 is configured by a well-known waveform memory reading method, and among the waveform data stored in its own internal memory, the tone data specified by the parameter supplied from the CPU 4 is read and the read waveform data is read out. A musical tone output WAVE is generated by performing waveform modification according to performance information supplied from the CPU 4. Reference numeral 8 denotes a sound system in which the musical sound output WAVE generated by the sound source 7 is converted into an analog waveform signal and subjected to filtering such as removing unnecessary noise, and then amplified to produce sound from the speaker SP.
[0014]
(2) Operation
Next, the operation of the embodiment will be described with reference to FIGS.
(1) Main routine operation
When the power is turned on, the CPU 4 reads a predetermined control program from the ROM 5, loads it into itself, and executes the main routine shown in FIG. When the main routine is executed, the CPU 4 first proceeds to step SA1, and performs initialization to reset various registers and flags stored in the work area of the RAM 6 and to set initial values. In step SA1, the sound source 7 is instructed to initialize various registers and flags.
When the initialization is completed, the CPU 4 advances the process to step SA2, and executes a key scan process to detect whether or not there is a switch operation in the panel switch group 1 or a key operation on the keyboard 2.
[0015]
Next, in step SA3 and subsequent steps, processing corresponding to the event obtained by the key scan is executed. That is, in step SA3, it is determined whether or not a switch operation is detected in the key scan process. If a switch operation is detected, the determination result is “YES”, and the process proceeds to step SA4.
For example, when a decorative sound addition switch that sets how many semitones away from the key-pressing sound is added upward or downward, or a harmony sound addition switch that adds a harmony sound, is operated. After executing the setting process corresponding to the operation, the process returns to step SA2.
[0016]
On the other hand, if no switch operation is detected in the key scan process, the determination result in step SA3 is “NO”, and the flow advances to step SA5. In step SA5, it is determined whether or not a key release operation is detected in the key scan process.
When the key release operation is detected, the determination result is “YES”, and the process proceeds to Step SA6. In step SA6, for example, key information processing (described later) for adding a decoration sound or a harmony sound corresponding to the specified key is executed for the musical tone of the pressed key, and then the process returns to step SA2.
[0017]
The definition of “decoration sound” and “harmonic sound” added to the key pressing sound in this key information processing will be described with reference to FIG. As shown in this figure, “harmonies” refers to musical tones that are separated by a predetermined pitch so as to harmonize with the pitch of the key-pressing sound, while “decoration” refers to the key-pressing sound and the “harmonic sound”. ”Indicates a musical sound that is generated immediately before a key-pressing sound and a“ harmonic sound ”are generated.
[0018]
In the case of the example shown in FIG. 6, a downward decorative sound corresponding to the key pressing sound (do) is generated at a key pressing timing T for a predetermined period, and then the key pressing sound (do) is generated while The key press sound (do) 's harmony sounds (mi) and (so), and the harmonious sounds (mi) and (so) preceding the harmony sounds (mi) and (so) are sounded with the timing relationship shown in the figure. It is like that.
[0019]
(2) Operation of key information processing routine
Next, the operation of the key information processing routine will be described with reference to FIG. When the key information processing routine is executed through step SA6 described above, the CPU 4 advances the processing to step SB1 shown in FIG. 7, and stores the key number KN of the key operated key in the register pit.
Next, in step SB2, mod12 (residue value) of the key number KN stored in the register pit is obtained, and it is determined whether or not the identification data read from the white key identification table TBL1 is “1” according to the remainder value. That is, the pitch name in one octave is obtained from mod 12 of the key number KN, and it is determined whether or not the key corresponding to the pitch name is a white key.
[0020]
If it is a black key, the determination result is “NO”. In this case, this routine is completed without performing any processing, but if it is a white key, the determination result is “YES”, and the next step SB3. Proceed with the process.
In step SB3, in the scale type sacle selected according to the operation of the scale selection switch (either the diatonic scale table TBL3 or the Arabic scale table TBL4 described above) The pitch change corresponding to the pitch name of the key number KN is read out and added to the register pit.
[0021]
Next, in step SB4, a decoration sound is generated by a decoration sound process to be described later, and in step SB5, an error flag barr is “1”, that is, an error occurs in key buffering performed in the decoration sound process to be described later. Determine if you did. If an error has occurred, the determination result is “YES” and the process proceeds to step SB7 described later. If no error has occurred, the determination result is “NO” and the process proceeds to the next step SB6. In step SB6, the sound source 7 is instructed to generate a musical tone of the pitch of the register pit to which the pitch change has been added during the key pressing operation, and on the other hand, the musical sound source 7 is muted to cancel the musical tone of the pitch of the register pit during the key release operation. The process proceeds to step SB7.
[0022]
In step SB7, it is determined whether or not the switch flag swHar is “1”, that is, whether or not the harmony sound is added by operating the harmony sound addition switch. If the setting is made so that the harmony sound is not added or the key is released, the determination result is “NO”, and this routine is completed. If the setting is to add the harmony sound, the determination result is “YES”. The routine is completed after a harmony sound is generated through a harmonization process to be described later via step SB8.
[0023]
(3) Operation of decorative sound processing routine
Next, the operation of the decorative sound processing routine will be described with reference to FIG. When the decorative sound processing routine is executed through step SB4 of the key information processing routine described above, the CPU 4 proceeds to step SC1 shown in FIG. 8 to determine whether or not the key operated key event is note-on. That is, it is determined whether the key is pressed or released. Hereinafter, the description will be divided into a case where the key is pressed and a case where the key is released.
[0024]
(B) When a key is pressed
When note-on occurs in response to the key pressing operation, the determination result in step SC1 is “YES”, and the flow proceeds to step SC2. In step SC2, the value of the key buffer nKeyBuf [pit] corresponding to the register pit is incremented.
The key buffer nKeyBuf [pit] is a buffer provided corresponding to each key, and temporarily stores data representing the key state. If the data is “1”, the corresponding key is in the sounding state. “0” indicates that the corresponding key is in a mute state.
[0025]
Now, after incrementing the value of the key buffer nKeyBuf [pit], the process proceeds to step SC3, and whether the incremented key buffer nKeyBuf [pit] is “2” or more, that is, during sound generation. It is determined whether or not a double key depression that further presses the key that has been made has been made.
If it is a double key press, the determination result is “YES”, the process proceeds to step SC4, and the sound source 7 is instructed to mute the musical sound of the key that is already sounding. Then, the process proceeds to step SC5, where the error flag berr is reset to zero, indicating that no error has occurred, and once this routine is completed.
[0026]
On the other hand, in the case of a normal key depression that is not a double key depression, the determination result in step SC3 is “NO”, and the process proceeds to step SC6. In step SC6, it is determined whether or not the switch flag swSou is “1”, that is, whether or not the decoration sound is set to be added by operating the decoration sound addition switch. If the setting is such that no decoration sound is added, the determination result is “NO”, and in this case, the routine is completed via step SC5 described above.
[0027]
On the other hand, if the setting is to add a decoration sound, the determination result is “YES”, the process proceeds to step SC7, and the pitch of the decoration sound is calculated by a decoration sound pitch calculation process described later. Next, at step SC8, the key number designated by the operation of the key designating switch in the scale type sacule (either the diatonic scale table TBL3 or the Arabic scale table TBL4 described above) selected according to the operation of the scale selection switch. A change in pitch corresponding to the key and the calculated pitch name of the decoration sound is read, and added to the calculated pitch of the decoration sound to generate a decoration sound newpit.
[0028]
Next, in step SC9, the sound source 7 is instructed to sound the generated decoration sound newpit, and in a subsequent step SC10, a predetermined time corresponding to the sounding period of the decoration sound newpit is waited.
Then, after a predetermined time has passed, the process proceeds to step SC11, the sound source 7 is instructed to mute the decoration sound newpit, and then the process proceeds to step SC5, where the error flag barr is reset to zero, indicating that no error has occurred, and this routine is completed. .
[0029]
(B) When a key release operation is performed
On the other hand, if a key release operation has been performed, the determination result in step SC1 is “NO”, and the process proceeds to step SC12. In step SC12, the value of the key buffer nKeyBuf [pit] corresponding to the register pit is decremented, and in the subsequent step SC13, it is determined whether or not the value of the decremented key buffer nKeyBuf [pit] is “0”. .
If the value of the key buffer nKeyBuf [pit] is “0”, the determination result is “YES”, the process proceeds to step SC14, the error flag berr is reset to zero, and this routine is executed after indicating that no error has occurred. Complete.
[0030]
On the other hand, if the value of the key buffer nKeyBuf [pit] is not “0”, that is, if it is a key release after the above-described double key depression, the determination result in step SC13 is “NO”, and the process returns to step SC15. Then, the error flag “berr” is set to “1” to indicate an error occurrence.
Thus, when the error flag “berr” is set to “1”, the determination result in the above-described step SB5 (see FIG. 7) becomes “YES”, and thus note-off (mute instruction) corresponding to the key release operation after the double key depression. ) To the sound source 7 is prevented.
[0031]
(4) Operation of ornamental pitch calculation processing routine
Next, the operation of the decorative tone pitch calculation processing routine will be described with reference to FIG. When the decorative tone pitch calculation processing routine is executed via step SC7 of the decorative sound processing routine described above, the CPU 4 advances the process to step SD1 shown in FIG. In step SD1, it is determined whether or not it is set to add an upward decoration sound to the key depression sound by operating the decoration sound addition switch.
Here, if it is set to add an upward decorative sound, the determination result is “YES”, the process proceeds to step SD2, and “1” is set in the register dev. On the other hand, if it is set to add a downward decorative sound, the determination result is “NO”, the process proceeds to step SD3, and “−1” is set in the register dev.
[0032]
Next, in step SD4, the counter cnt is reset to zero, and in the subsequent step SD5, the value of the register pit (key number KN) is stored in the register newpit. In step SD6, the value of the register dev is added to the register newpit. That is, one semitone is added to the key number KN (or one semitone is subtracted from the key number KN).
Next, in step SD7, mod12 (residue value) is obtained for the value of the register newpit, and it is determined whether or not the identification data read from the white key identification table TBL1 is “1” according to the remainder value. That is, it is determined whether the key obtained by adding the key number KN by one semitone (or subtracting one semitone from the key number KN) is a white key.
[0033]
If it is a black key, the determination result is “NO”, the process returns to step SD6, and the key number KN is again added by one semitone (or subtracted by one semitone from the key number KN). When the key obtained by adding one semitone to the key number KN (or subtracting one semitone from the key number KN) is a white key, the determination result in step SD7 is “YES”, and the process proceeds to step SD8. In step SD8, the counter cnt is incremented and incremented, and in the subsequent step SD9, it is determined whether or not the value of the incremented counter cnt is equal to or greater than the register sodev.
The register sodev stores the difference in the pitch of the decorative sound set according to the operation of the decorative sound addition switch, that is, the frequency specifying how many times the decorative sound is separated from the key pressing sound. ing.
[0034]
Therefore, in step SD9, the value of the counter cnt that is incremented each time the key obtained by adding one semitone to the key number KN (or subtracting one semitone from the key number KN) becomes a white key is set. Judging whether the frequency has been reached.
If the set frequency is not reached, the determination result is “NO”, and the above steps SD6 to SD8 are repeated, and the key number KN is added by one semitone (or one semitone is subtracted from the key number KN). ) The value of the counter cnt is incremented every time the key that has been changed becomes a white key. When the value of the counter cnt reaches the set frequency, the determination result is “YES”, whereby the value of the register newpit is determined as the pitch of the decoration sound, and this routine is completed.
[0035]
(5) Harmonize processing routine operation
Next, the operation of the harmonization processing routine will be described with reference to FIG. When the harmonization processing routine is executed through step SB8 (see FIG. 7) of the key information processing routine described above, the CPU 4 advances the processing to step SE1 shown in FIG.
In step SE1, the register i is reset to zero, and in the subsequent step SE2, it is determined whether or not the value of the register i is “2” or more, that is, whether or not two harmony sounds have been added to the key pressing sound. . When the addition is completed, the determination result is “YES”, and this routine is completed. However, if the addition is not completed, the determination result is “NO”, and will be described later until the value of the register i becomes “2” or more. Steps SE3 to SE9 are repeated.
[0036]
In step SE3, the value of the register pit (key number KN) is stored in the register hpit. In step SE4, in the harmony interval table TBL2 (nHr [0] or nHr [1]) selected according to the value of the register i, the key number KN set according to the operation of the key designation switch and the key number KN The pitch change corresponding to the pitch name is read out, added to the pitch of the key number KN, and stored in the register hpit.
[0037]
Subsequently, in step SE5, in the scale type sacule selected according to the operation of the scale selection switch (either the diatonic scale table TBL3 or the Arabic scale table TBL4 described above), the adjustment specified by the operation of the adjustment specification switch. The pitch change corresponding to the number key and the pitch name derived from the value of the register hpit is read out and added to the register hpit, whereby the final pitch of the harmony tone hpit (hereinafter referred to as the harmony tone hpit) is obtained. appear.
[0038]
Thereafter, the above-described decoration sound processing routine (see FIG. 8) is executed through step SE6 to generate a decoration sound to be added to the harmony sound. Next, in step SE7, it is determined whether or not an error has occurred in the decorative sound processing routine. If there is no error, the determination result is “NO”, and the process proceeds to the next step SE8, where the harmony sound hpit is generated as the sound source 7. And instructing sound generation, the process proceeds to step SE9.
On the other hand, if an error occurs in the decorative sound processing routine, the determination result in step SE7 is “YES”. In this case, the sound source 7 is not instructed to sound the harmony sound hpit, and the process proceeds to step SE9, where the value of register i After incrementing, the process returns to step SE2.
[0039]
As described above, according to the present embodiment, for example, as shown in FIG. 6, when “do” is depressed at the key depression timing T, first, it corresponds to the key depression sound “do” and is designated. A downward decoration sound “shi” corresponding to the key is generated, and after sounding it for a predetermined period, the keypress sound “do” is generated and the keypress sound “do” is dealt with and designated. The harmony sounds “Mi” and “So” according to the key and the harmony sounds “Mi” and “So” respectively, and the downward decorative sounds “Le” and “Fa” according to the specified key. ”Is added at the timing shown in the figure, so even a user unfamiliar with key operations can perform a variety of performances with decoration sounds and harmony sounds that are suitable for tones simply by playing white keys. Yes.
[0040]
According to the present invention,In response to the key being pressed, a decorative sound of a decorative pitch having a pitch difference between the pitch specified by the pressed key and a set frequency is generated and generated for a predetermined period of time, After the decoration sound is generated for a predetermined period, a key pressing sound having a pitch designated by the pressed key is generated. In response to the sound of the key depression, a pitch having a predetermined pitch difference from the pitch designated by the depressed key is calculated, and the calculated pitch is adjusted to a predetermined key. A tone pitch for harmony converted so as to be matched is generated, and a decoration tone having a pitch difference of a set frequency with the tone pitch for harmony is generated and generated for a predetermined period. Further, after the decoration sound is generated for a predetermined period, a harmony sound having a pitch for harmony is generated and generated. For this reason,By simply pressing a single key, decoration sounds and harmony sounds suitable for tonality can be generated, so that even a user unfamiliar with key operations can easily realize various performance expressions.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment according to the present invention.
FIG. 2 is a diagram showing a configuration of a white key identification table TBL1 and a harmonized pitch table TBL2.
FIG. 3 is a diagram showing a configuration of a diatonic scale table TBL3.
FIG. 4 is a diagram showing a configuration of an arabic scale table TBL4.
FIG. 5 is a flowchart showing an operation of a main routine.
FIG. 6 is a diagram for explaining the definition of decoration sound and harmony sound in the present invention.
FIG. 7 is a flowchart showing an operation of a key information processing routine.
FIG. 8 is a flowchart showing the operation of a decorative sound processing routine.
FIG. 9 is a flowchart showing the operation of a decoration pitch calculation routine.
FIG. 10 is a flowchart showing the operation of a harmonization processing routine.
[Explanation of symbols]
1 Panel switch group
2 keyboard
3 Display section
4 CPU
5 ROM
6 RAM
7 Sound source
8 Sound system

Claims (5)

In response to the key being pressed, a decorative sound having a decorative pitch having a pitch difference between the pitch specified by the pressed key and a set frequency is generated and generated for a predetermined period. 1 decorative sound generating means;
A key-pressing sound generating means for generating a key-pressing sound having a pitch specified by the pressed key after a decoration sound is generated by the first decorative sound generating means for a predetermined period;
In response to the keying sound being generated, a pitch having a predetermined pitch difference from the pitch specified by the pressed key is calculated, and the calculated pitch is specified in advance. Harmony pitch generation means for generating a pitch for harmony converted to match the key,
Second decoration sound generating means for generating a decoration sound of a decoration pitch having a pitch difference of the set frequency from the harmony pitch and generating a predetermined period;
Harmony sound generation means for generating and generating a harmony sound having a pitch for the harmony after a decoration sound is generated for a predetermined period by the second decoration sound generation means;
A key information processing apparatus comprising: The key information processing apparatus further sets a pitch obtained by converting a pitch designated by the depressed key so as to be adapted to the previously specified key, as a pitch designated by the depressed key. The key information processing apparatus according to claim 1, further comprising one conversion unit . The key information processing apparatus further determines whether or not the pitch specified by the pressed key is a pitch corresponding to a white key on the keyboard, and only when the specified sound is determined to correspond to the white key. 3. The key information processing apparatus according to claim 2, further comprising a first white key discriminating unit that sends a height to the first converting unit. The first and second ornamental sound generating means further includes second converter means for converting the ornamental pitches so as to conform to the pre-specified key and using the ornamental pitches as the ornamental pitches. The key information processing apparatus according to claim 1, comprising: In response to the key depression, a decoration sound having a pitch for decoration having a pitch difference between the pitch designated by the depressed key and a set frequency is generated and generated for a predetermined period. 1 decoration sound generation process,
A key-pressing sound generation process for generating a key-pressing sound having a pitch specified by the pressed key after a decoration sound is generated for a predetermined period in the first decorative sound generating process;
In response to the keying sound being generated, a pitch having a predetermined pitch difference from the pitch specified by the pressed key is calculated, and the calculated pitch is specified in advance. Harmony pitch generation process to generate a harmony pitch converted to fit the key,
A second decorative sound generation process for generating a decorative sound of a decorative pitch having a pitch difference of a set frequency from the harmony pitch and generating a predetermined period;
A harmony sound generation process for generating and generating a harmony sound having a pitch for the harmony after a decoration sound is generated for a predetermined period in the second decoration sound generation process;
A key information processing method comprising:

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