JP4103706B2 - Sound source circuit control program and sound source circuit control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound source circuit control program and a sound source circuit control apparatus suitable for use in generating musical tone signals.
[0002]
[Prior art]
(1) About the operation of the tone generator for the hold signal
2. Description of the Related Art Conventionally, a sound source device that generates a musical tone signal when performance information such as a MIDI signal is input is known. A tone generator includes a tone generator circuit that generates a tone signal based on various parameters written in a predetermined parameter register, and a control circuit that controls the tone generator circuit by writing various parameters into the register based on received performance information It consists of. Here, FIG. 2A shows an example of an envelope waveform of a tone signal generated when a note-on signal and a note-off signal are sequentially transmitted to the sound source device. Note that the envelope waveform shown in FIG. 2 (a) is frequently used for the reproduction of scrub instruments, wind instruments, and various other timbres.
[0003]
The envelope waveform shown in FIG. 2 (a) has an “attack period” that starts immediately after receiving a note-on signal and rises in level, a “decay period” in which the level falls following the attack period, and a note after the decay period. It consists of a “sustain interval” in which the envelope level is kept flat until the off signal is input, and a “release interval” that starts immediately after receiving the note off signal and attenuates the level. A specific process executed by the sound source device to generate the envelope waveform will be described.
[0004]
First, when a note-on signal is supplied to the tone generator, one vacant channel in the tone generator circuit is assigned as a tone generation channel for the note-on signal. Next, based on the “velocity” included in this note-on signal, the parameters, that is, the slope of the attack section (attack rate), the maximum envelope level (output level) in the attack section, and the slope of the decay section (decay) Rate), the initial value of the sustain section level (sustain level), and the slope of the sustain section (sustain rate) are calculated. In the example shown in FIG. 2A, since the envelope level is not attenuated in the sustain period, the sustain rate is “0”.
[0005]
Next, these calculated parameters are written into the parameter register associated with the sound generation channel, and subsequently, “note-on information” instructing the sound generation channel to start sound generation is written into the parameter register of the tone generator circuit. Thereby, in the tone generator circuit, generation of the envelope waveform in the sound generation channel is started. On the other hand, in the tone generator circuit, an original musical tone signal (a musical tone signal before the envelope is applied) is generated according to the tone color. As this generation method, for example, various methods such as a PCM method, an FM method, and a physical model method are known. Then, the final musical sound signal is generated by multiplying the original musical sound signal by the envelope level at that time.
[0006]
Next, when a note-off signal is supplied to the tone generator, “note-off information” for instructing the start of mute to the parameter register of the corresponding tone generation channel in the tone generator circuit and “release” which is the slope of the envelope level of the release section "Rate" is written. As a result, in the sound generation channel, the envelope level is attenuated based on the release rate, and the music signal is completely muted over time. When the tone signal is completely muted, the sound channel is released and can be assigned to a new note-on signal. The state of the tone generator circuit after the note-off information is supplied is referred to as “note-off state”.
[0007]
By the way, in an acoustic piano, when a string is struck by a key pressing operation, a musical tone is generated by free vibration of the string. When the key is continuously pressed, the vibration amplitude of the string is gently attenuated by air resistance or the like. Go. When the key release operation is performed, the vibration amplitude of the string is rapidly attenuated by the damper coming into contact with the string. In order to simulate such behavior, an envelope waveform shown in FIG. 2C is used for a tone color of a piano or the like. Comparing the envelope waveforms in (a) and (c) of the figure, in the waveform of (c) in the figure, the sustain rate is set according to the attenuation rate during free vibration of the string, and this also makes the envelope in the sustain section. The level is gradually decreasing.
[0008]
Next, in the MIDI standard, a hold signal (hold on and hold off) is defined as a kind of control change. The hold on / off signals respectively indicate “sound duration” and “sound duration cancellation”. The operation when the hold on / off signal is supplied to the tone generator will be described for each type of tone color. First, a control method for the tone color of a rubbing instrument, wind instrument, etc. will be described with reference to FIG. In the figure, it is assumed that the tone-off note-off signal is supplied to the sound source device following the tone-on note-on signal and hold-on signal. In such a case, writing of note-off information to the sound source circuit based on the note-off signal is suspended. Then, when a hold-off signal is supplied to the sound source device thereafter, note-off information is written into the parameter register at that time, thereby starting the mute processing of the sound generation channel. As described above, in this specification, a tone color for which supply of note-off information to the tone generator circuit is suspended in the hold-on state is referred to as a “first type tone color”.
[0009]
Next, the operation at the time of hold-on for the tone color of a piano or the like will be described with reference to FIG. In the figure, it is assumed that the tone-off note-off signal is supplied to the sound source device following the tone-on note-on signal and hold-on signal of a piano or the like. In such a case, note-off information based on this note-off signal is immediately written to the parameter register. However, the release rate in that case is set to a value equal to the sustain rate, that is, a value corresponding to the amplitude attenuation rate during free vibration of the string. When the hold-off signal is supplied to the sound source device, the release rate is set to a normal value, that is, a value corresponding to the amplitude attenuation rate during braking by the damper. In this way, for a tone such as a piano, the on / off operation of a damper pedal such as an acoustic piano is simulated by hold on / off. In this specification, the timbre that switches the release rate in accordance with the hold on / off state without suspending the supply of note-off information to the tone generator circuit is referred to as a “second type timbre” in this specification.
[0010]
Next, the reason why the operation for the hold on / off signal is different depending on the type of tone color as described above will be described. First, in an acoustic piano, it is possible to perform the same key repeatedly while the performer continues to step on the damper pedal. Such a playing method is nothing other than “a note-on signal and a note-off signal are repeatedly supplied alternately in the hold-on state” on the MIDI signal. In the MIDI signal, it is not assumed that the tone signals having the same pitch and the same tone color are simultaneously generated in a plurality of tone generation channels. Therefore, synthesis of tone signals is started in one tone generation channel based on a certain note-on signal. In order to do this, the other tone generation channels having the same pitch and the same tone must be in a note-off state in advance. Therefore, if a note-off signal for the second tone color is supplied to the sound source device, the corresponding tone generation channel is quickly set in preparation for a note-on signal having the same pitch and the same tone that may occur subsequently. It is understood that the note-off timing cannot be delayed even in the hold-on state.
[0011]
On the other hand, the change due to the note-off information is not limited to the envelope level. Depending on the type of timbre, a change occurs in the original musical sound signal before the envelope is applied, or the original musical sound signal itself is attenuated in some cases. In some cases. As described above, note-off information cannot be supplied to the tone generator circuit in the hold-on state in a timbre in which the original musical tone signal is changed by the note-off information. This is because if note-off information is supplied, there will arise a problem that the final tone signal changes even if the envelope level is kept constant. Therefore, it is necessary to categorize such timbres as first-class timbres and suspend the supply of note-off information to the tone generator circuit until the timing at which the hold-on state should be canceled (until the hold-off signal is supplied to the tone generator). is there. As described above, in a sound source device that synthesizes musical tone signals of various musical instruments including a piano, it is difficult to unify all the timbres to be either the first type or the second type timbre, and inevitably the first type. The seed and the second kind timbre coexist.
[0012]
(2) About truncation processing
In general, the number of sound generation channels that can be sounded simultaneously in the sound source circuit is limited (for example, “32” channels). Therefore, when all of these sound generation channels are in use, a new note-off signal is supplied to the sound source device. There are not enough pronunciation channels. In such a case, it is necessary to forcibly mute and release any of the sound generation channels in use and assign the sound generation channel to a new note-on signal. Such a process of forcibly releasing any of the sound generation channels in use is referred to as a “truncate process”. Various techniques are known for determining a channel to be truncated. For example, Patent Document 1 discloses a technique in which sound generation channels that are already in a note-off state are referred to in order of note-off timing, and the sound generation channel is subjected to truncation if the level of the sound generation channel referred to is equal to or lower than a predetermined value. Yes.
[0013]
[Patent Document 1]
JP-A-8-179767
[0014]
[Problems to be solved by the invention]
However, according to the above-described technique, when the note-off signals of the first and second type timbres are repeatedly supplied in the hold-on state, the sound channel of the first type timbre does not enter the note-off state, and the second type The tone sound channel is in the note-off state. As a result, if truncation processing is required during the ensemble of the first and second type timbres, only the sounding channel that is generating the second type timbre is subject to truncation. In other words, only the first type timbre is continued for a long time, only the second type timbre is muted one after another, and the entire musical tone becomes very unnatural.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a sound source circuit control program and a sound source circuit control device capable of performing natural truncation processing even when a plurality of timbres are ensembled. .
[0015]
[Means for Solving the Problems]
  In order to solve the above problems, the present invention is characterized by having the following configuration. The parentheses are examples.
  The sound source circuit control program according to claim 1, comprising a plurality of sound generation channels.(Paragraph 0017)When note-on information is supplied to any tone generation channel, generation of a musical tone signal is started in the tone generation channel(Paragraph 0018)At the same time, when note-off information is supplied to the tone generation channel, the sound signal mute processing in the tone generation channel is started.(Paragraph 0020)A sound source circuit control program for controlling the sound source circuit (30),When a hold-on signal for instructing the continuation of the musical sound signal is supplied, a hold register (paragraph 0020) that stores either the hold-on state or the hold-off state as the current state of the tone generator circuit (30). To store the hold-on state (paragraph 0024, FIG. 5). (a) Step SP200) When a hold-off signal is supplied, the hold-off state is stored in the hold register (paragraph 0024, FIG. 5). (b) Step SP210) and a first determination process (paragraph 0020, step SP10 in FIG. 3) for determining whether a hold-on state or a hold-off state is stored in the hold register when a note-off signal is supplied. ), And when it is determined that the hold-on state is stored in the first determination process (paragraph 0020, “YES” in step SP10 in FIG. 3), the suppliedTone determination process for determining whether the note-off signal is for the first type tone color or the second type tone color (Paragraph 0021,SP40) and on the condition that the note-off signal is determined to be for the first type timbre in the timbre determination process (SP40).(“YES” in paragraph 0022, step SP40), Storing information in the note-off hold register that specifies the tone generation channel corresponding to the note-off signal while holding off the supply of note-off information to the tone generator circuit (30) (Paragraph 0022, FIG. 3 StepSP50) and on the condition that the note-off signal is determined to be for the second type timbre in the timbre determination process (SP40).(Paragraph 0023, “NO” in step SP40 in FIG. 3), Immediately supplying note-off information to the sound source circuit (30) (Paragraph 0023, FIG. 3 StepSP30) and note-on signalIs supplied,An empty channel determination process for determining whether or not an empty sound channel exists (Paragraph 0018, FIG. 4 StepSP110) and on the condition that it is determined that the empty sound channel does not exist in the empty channel determination process.(Paragraph 0026, “NO” in step SP120 in FIG. 4),A second determination process (paragraph 0026, step SP140 in FIG. 4) for determining whether a hold-on state or a hold-off state is stored in the hold register, and the hold-on state is stored by the second determination process. (Paragraph 0028, “YES” in step SP140),Sound channel stored in the note-off hold register(Paragraph 0028, FIG. 4, step SP150)And a tone generation channel for which note-off information has already been supplied to the tone generator circuit (30).(Paragraph 0028, step SP160 in FIG. 4)The truncation target channel determination process for determining the truncation target channel to be forcibly released from both sound generation channels (Paragraph 0028, Step(SP170), and an assigning step of assigning the determined truncation target channel to the note-on signal (Paragraph 0028, Figure 4 stepSP130) is executed by the processing device.
  The sound source circuit control device according to claim 2 further comprises a plurality of sound generation channels.(Paragraph 0017)When note-on information is supplied to any tone generation channel, generation of a musical tone signal is started in the tone generation channel(Paragraph 0018)At the same time, when note-off information is supplied to the tone generation channel, the sound signal mute processing in the tone generation channel is started.(Paragraph 0020)A control device for the tone generator circuit (30),As the current state of the sound source circuit (30)Hold register that stores either the hold-on state or hold-off state (Paragraph 0020)When,When a hold-on signal is supplied, the hold-on state is stored in the hold register (paragraph 0024, FIG. 5). (a) Step SP2 00), when the hold-off signal is supplied, the hold-off state is stored in the hold register (paragraph 0024, FIG. 5). (b) Step SP210), hold register control means, and first judgment means for judging whether a hold-on state or a hold-off state is stored in the hold register when a note-off signal is supplied (paragraph 0020, Step SP10 in FIG. 3) and when the first determination means determines that the hold-on state is stored (paragraph 0020, “YES” in step SP10 in FIG. 3), the suppliedTone determination means for determining whether the note-off signal is for the first type tone color or the second type tone color (Paragraph 0021,SP40), and a note-off hold register (SP40) for storing information for specifying a sound channel for which supply of the note-off information is heldParagraph 0022, RAM 52) and the tone color judging means (SP40) on the condition that the note-off signal is judged to be for the first type tone color.(“YES” in paragraph 0022, step SP40)And a note-off holding means for storing in the note-off holding register information for specifying a tone generation channel corresponding to the note-off signal while holding off the supply of note-off information to the tone generator circuit (30).Paragraph 0022, FIG. 3 StepSP50) and the timbre determination means (SP40) on the condition that the note-off signal is determined to be for the second type timbre(Paragraph 0023, “NO” in step SP40 in FIG. 3), Note-off supply means for immediately supplying note-off information to the tone generator circuit (30) (Paragraph 0023, FIG. 3 StepSP30) and note-on signalIs supplied,Empty channel determination means for determining whether or not an empty sound channel exists (Paragraph 0018, FIG. 4 StepSP110) and on the condition that the empty channel determination means determines that the empty sound channel does not exist(Paragraph 0026, “NO” in step SP120 in FIG. 4),The second determination means (paragraph 0026, step SP140 in FIG. 4) for determining whether the hold register stores the hold-on state or the hold-off state, and the second determination means stores the hold-on state. (Paragraph 0028, “YES” in step SP140),Sound channel stored in the note-off hold register(Paragraph 0028, FIG. 4, step SP150)And a tone generation channel for which note-off information has already been supplied to the tone generator circuit (30).(Paragraph 0028, step SP160 in FIG. 4)Truncation target channel determination means for determining a truncation target channel to be forcibly released from both sound generation channels (Paragraph 0028, StepSP170) and an assigning means for assigning the determined truncation target channel to the note-on signal (SP170)Paragraph 0028, Figure 4 stepSP130).
[0016]
DETAILED DESCRIPTION OF THE INVENTION
1． Configuration of the embodiment
1.1. overall structure
First, a hardware configuration of a sound source device 100 according to an embodiment of the present invention will be described with reference to FIG.
In the figure, reference numeral 10 denotes an operator, which includes a switch, a keyboard, a volume, and the like. Reference numeral 15 denotes a detection circuit which detects the state of the switch, the position of the volume, and the like. Reference numeral 20 denotes a display unit, which includes a liquid crystal panel or the like. A display circuit 25 includes a video RAM, a graphic controller, and the like, and displays various types of information on the display unit 20 based on information supplied via the bus line 60.
[0017]
A tone generator circuit 30 generates musical sound signals of a plurality of channels (for example, a maximum of “32” channels). Inside the tone generator circuit 30 is provided a parameter register 30a for storing various parameters for generating these musical tone signals. The contents of the parameter register 30a can be updated as appropriate via the bus line 60. A sound system 35 is composed of an amplifier and a speaker, and emits a musical sound signal generated in the sound source circuit 30. A communication interface 40 is connected to MIDI devices such as a keyboard and a sequencer, and exchanges MIDI signals with these MIDI devices. A ROM 50 stores a control program and the like which will be described later. Reference numeral 54 denotes a CPU which controls each unit via the bus line 60 based on a control program stored in the ROM 50. A RAM 52 is used as a work memory for the CPU 54.
[0018]
2． Operation of the embodiment
2.1. Processing for note-on signal (without truncation)
Next, the operation of this embodiment will be described. First, when a note-on signal is supplied to the sound source device 100, a note-on processing routine shown in FIG. 4 is started. In the figure, when the process proceeds to step SP110, an empty tone generation channel in the tone generator circuit 30 is searched. Next, when the process proceeds to step SP120, it is determined whether or not an empty sound channel is detected. If it is detected, “YES” is determined, and the process proceeds to step SP130. Here, the detected empty sound channel is assigned as the sound channel corresponding to the current note-on signal.
[0019]
Here, the note-on signal includes pitch and velocity information. Further, before the note-on signal is supplied, a tone color is designated in advance by a message such as “program change”. Therefore, when a note-on signal is received, the tone color, pitch, and velocity are specified. Therefore, various parameters for synthesizing the musical tone signal are determined based on these pieces of information, and these parameters are written in a location corresponding to the sound generation channel in the parameter register 30a of the tone generator circuit 30. Further, when note-on information for instructing the start of sounding is written into the parameter register 30a, generation of a tone signal in the sounding channel is started.
[0020]
2.2. Processing for note-off signal
Next, when a note-off signal is supplied to the sound source device 100, a note-off process routine shown in FIG. 3 is started. In the figure, when the process proceeds to step SP10, it is determined whether or not the current state of the sound source device 100 is the hold-on state. As will be described in detail later, the RAM 52 is provided with an area called “hold register”. This hold register is in a hold-on state if the value is “1”, and in a hold-off state if the value is “0”. Indicates. That is, in step SP10, it is determined whether or not the hold register is “1”. If “NO” is determined here, the process proceeds to step SP20, and the “normal release rate”, that is, the release rate corresponding to the hold-off state is written in the location corresponding to the sound generation channel of the parameter register 30a. Next, when the process proceeds to step SP30, note-off information is supplied to the tone generator circuit 30. As a result, thereafter, the tone signal of the tone generation channel is attenuated at the release rate written in the parameter register 30a, and when the tone signal is sufficiently attenuated, the tone generation channel is released.
[0021]
On the other hand, if the sound source device 100 is in the hold-on state, “YES” is determined in step SP10, and the process proceeds to step SP40. Here, it is determined whether or not the tone color of the tone signal corresponding to the note-off signal is the first type tone color. As described above with reference to FIGS. 2B and 2D, the “first type timbre” is “a timbre that suspends supply of note-off information to the tone generator circuit in the hold-on state”. The “second type timbre” is “a timbre that does not suspend supply of note-off information to the tone generator circuit and switches the release rate according to the hold on / off state”.
[0022]
If "YES" is determined in the step SP40, the process proceeds to a step SP50, the sounding channel number is written in the "note-off hold register" secured in a predetermined area in the RAM 52, and the process of this routine is finished. To do. Here, the “note-off hold register” will be described. As described above, for the first type timbre, even if a note-off signal is supplied to the sound generator device 100 in the hold-on state, the note-off information of the sound source circuit 30 is not supplied until the next hold-off signal is supplied. Supply is suspended. The note-off hold register is a register that stores channel numbers of one or a plurality of tone generation channels that hold supply of note-off information in this way. When the supply of note-off information to the tone generator circuit 30 is suspended, as shown in the interval 200 of FIG. 2B, the generation of the tone signal in the sound generation channel is the same as when the note-off signal is not supplied. Continue in state.
[0023]
If the note-off signal for the second type tone color is supplied when the sound source device 100 is in the hold-on state, “NO” is determined in step SP40, and the process proceeds to step SP60. Here, a value equal to the release rate for holding, that is, the sustain rate is written in a location corresponding to the sounding channel in the parameter register 30a. Next, when the process proceeds to step SP30, note-off information is supplied to the tone generator circuit 30. As a result, for example, as shown in a section 210 of FIG. 2D, the tone signal of the sound generation channel is attenuated at a rate similar to that of the sustain section 215.
[0024]
2.3. Processing for hold on / off signal
Next, an operation when a hold on / off signal is supplied via the communication interface 40 will be described. First, when a hold-on signal is supplied, a hold-on processing routine shown in FIG. When the process proceeds to step SP200, the hold register is set to “1”. When a hold-off signal is supplied via the communication interface 40, a hold-off processing routine shown in FIG. In the figure, when the process proceeds to step SP210, the hold register is reset to “0”. Next, when the process proceeds to step SP215, the tone generation circuit 30 stores the tone generation channels stored in the note off hold register, that is, all tone generation channels for which the supply of note off information to the tone generator circuit 30 is reserved. Note-off information is transmitted. As a result, the state of these tone generation channels transitions to the note-off state, and a relatively rapid decay of the musical tone signal is started.
[0025]
When the supply of note-off information to all of these tone generation channels is completed, the process proceeds to step SP220, and the contents of the note-off hold register are cleared. Next, when the process proceeds to step SP225, “normal release rate” is written in the parameter register 30a for the sound generation channel in the note-off state among the sound channels of the second tone color. As a result, the sound signal starts to be attenuated relatively rapidly in the sound generation channel.
[0026]
2.4. Processing for note-on signals (with truncation)
Next, a process when an empty sound channel is not detected in step SP120 of the note-on process routine (FIG. 4) will be described. In such a case, “NO” is determined in step SP120, and the process proceeds to step SP140. Here, the hold register is referred to, and it is determined whether or not the current state of the sound source device 100 is the hold-on state (hold register = “1”). If “NO” (hold-off state) is determined here, the process proceeds to step SP160, and among the sound generation channels of the tone generator circuit 30, the tone generation channel set to the note-off state, that is, the tone generator circuit 30 is already set. The sound channel in which the note-off information is transmitted is extracted.
[0027]
Next, when the process proceeds to step SP170, one sounding channel that satisfies the “predetermined condition” is detected from all the extracted sounding channels, and the detected sounding channel is determined as a truncation target channel, and the one sounding channel is determined. The sound generation process of the channel (channel to be truncated) is forcibly terminated. Here, as the “predetermined condition”, for example, “the one with the earliest timing at which the tone generator 100 receives the note-off signal” or “the one with the lowest level of the tone signal being generated” may be applied. Next, when the process proceeds to step SP130, the forcibly ended sound generation channel is assigned to a new note-on signal, and a sound generation process corresponding to the new note-on signal is started.
[0028]
On the other hand, if the current state of the sound source device 100 is the hold-on state, “YES” is determined in step SP140, and the process proceeds to step SP150. Here, all sound generation channels stored in the note-off hold register, that is, sound generation channels for which supply of note-off information to the sound source circuit 30 is reserved are extracted. In step SP160, as described above, the tone generation channel set in the note-off state in the tone generator circuit 30 is extracted. When both steps SP150 and SP160 are executed in this way, in the next step SP170, the above-mentioned “predetermined condition” is satisfied from all the sound generation channels extracted in both steps SP150 and SP160. One sounding channel is detected, the detected sounding channel is determined as a truncation target channel, and the sounding process of the determined truncation target channel is forcibly terminated. Then, as described above, when the process proceeds to step SP130, the forcibly terminated sound generation channel is assigned to a new note-on signal.
[0029]
As described above, according to the present embodiment, when truncation processing is necessary in the hold-on state, not only the sound generation channel set in the note-off state in the tone generator circuit 30 but also the note-off hold register is stored. Sound generation channels are also candidates for truncation processing (steps SP150, SP160, 170). For this reason, according to the present embodiment, it is possible to select a tone generation channel having the least influence among all the tone generation channels as a truncation target, and natural truncation processing can be performed even when a plurality of timbres are ensembled.
[0030]
3． Modified example
The present invention is not limited to the above-described embodiment, and various modifications can be made as follows, for example.
(1) In step SP170 of the above embodiment, one sounding channel to be subjected to truncation processing is specified from all sounding channels extracted in steps SP150 and SP160. It is not necessary to target “all” pronunciation channels. For example, the sound channel is narrowed down according to a predetermined condition, for example, only the sound channel of a specific part is subjected to truncation processing, and the sound channel targeted for truncation processing is identified from the narrowed sound generation channels. It may be.
For example, a technique called “layer” is known in which a plurality of tone generation channels are allocated corresponding to one note-on signal, and tone signals of a plurality of tone colors (for example, a piano and a violin) forming a predetermined “set” are simultaneously pronounced. Yes. When such a “layer” is applied, when one sound channel assigned to the same note-on signal is released, the other sound channel is preferentially selected as a truncation target. It is good to.
[0031]
(2) In the above embodiment, as examples of the “predetermined condition” in step SP170, “the one with the earliest timing at which the tone generator 100 receives the note-off signal” and “the level of the tone signal being sounded is the highest. Although “low” is mentioned, this “predetermined condition” is not limited to the above. That is, various methods are known as methods for determining one sounding channel that is considered to have little influence on the sound being sounded even if the volume of the sound signal being sounded is sufficiently small and forcibly muted. Therefore, it goes without saying that these methods may be applied to the present invention.
[0032]
(3) In step SP140 of the above embodiment, it is determined whether or not the hold is on. If not, the process of step SP150 is skipped. However, the determination at step SP140 may be omitted, and both steps SP150 and SP160 may be executed regardless of whether the hold is on. This is because the note-off hold register is cleared when the hold-off state is entered (see step SP220 in FIG. 5B). Therefore, even if step SP150 is executed, a tone generation channel that is not in the note-off state is selected as a truncation target. This is because such a problem does not occur.
[0033]
(4) In the above embodiment, truncation processing or the like is executed by a program stored in the ROM 50. However, this program may be stored in a hard disk, a CD-ROM or the like and expanded in the RAM 52 for execution. Further, only this program can be stored in a recording medium such as a CD-ROM or a flexible disk and distributed, or can be distributed through a transmission path.
[0034]
【The invention's effect】
As described above, according to the present invention, on the condition that it is determined that there is no empty sound channel when the note-on signal is received, the sound channel and the sound source circuit stored in the note-off hold register are determined. Therefore, the truncation target channel to be forcibly released is determined from the sound generation channels of the sound generation channels to which note-off information has already been supplied. Therefore, natural truncation processing can be performed even when ensembles of a plurality of tones are used.
[Brief description of the drawings]
FIG. 1 is an overall block diagram of a sound source device 100 according to an embodiment of the present invention.
FIG. 2 is an envelope waveform diagram in the sound source circuit 30;
FIG. 3 is a flowchart of a note-off process routine.
FIG. 4 is a flowchart of a note-on process routine.
FIG. 5 is a flowchart of a hold-on process routine and a hold-off process routine.
[Explanation of symbols]
10: operator, 15: detection circuit, 20: display unit, 25: display circuit, 30: sound source circuit, 30a: parameter register, 35: sound system, 40: communication interface, 50: ROM, 52: RAM, 54: CPU, 60: bus line, 100: sound source device.

Claims (2)

When there is a plurality of sound generation channels and note-on information is supplied to any of the sound generation channels, generation of a musical tone signal is started in the sound generation channel, and note-off information is supplied to the sound generation channel And a sound source circuit control program for controlling the sound source circuit for starting the mute processing of the musical sound signal in the sound generation channel,
When a hold-on signal instructing the continuation of the musical sound signal is supplied, the hold-on state is stored in a hold register that stores either the hold-on state or the hold-off state as the current state of the sound source circuit. Storing a hold-off state in the hold register when a hold-off signal is supplied;
A first determination step of determining whether a hold-on state or a hold-off state is stored in the hold register when a note-off signal is supplied;
A timbre that determines whether the supplied note-off signal is for the first timbre or the second timbre when it is determined that the hold-on state is stored in the first determination process Judgment process,
A tone generation channel corresponding to the note-off signal while holding off the supply of note-off information to the sound source circuit on condition that the note-off signal is determined to be for the first type timbre in the tone determination process Storing information for identifying in a note-off hold register;
A step of immediately supplying note-off information to the sound source circuit on the condition that the note-off signal is determined to be for the second type timbre in the timbre determination step;
An empty channel determination process for determining whether an empty sound channel exists when a note-on signal is supplied ;
A second determination step of determining whether a hold-on state or a hold-off state is stored in the hold register on the condition that the empty sound channel is determined not to exist in the empty channel determination step ;
If it is determined by the second determination process that the hold-on state is stored, note-off information already supplied to the sound-generation channel and the tone generator circuit stored in the note-off hold register A truncation target channel determination process for determining a truncation target channel to be forcibly released from both sound generation channels of the channel;
A program for controlling a sound source circuit, causing a processing device to execute an assigning step of assigning the determined truncation target channel to the note-on signal. When there is a plurality of sound generation channels and note-on information is supplied to any of the sound generation channels, generation of a musical tone signal is started in the sound generation channel, and note-off information is supplied to the sound generation channel And a sound source circuit control device for starting mute processing of the musical sound signal in the sound generation channel,
A hold register that stores either a hold-on state or a hold-off state as the current state of the sound source circuit ;
A hold register control means for storing a hold-on state in the hold register when a hold-on signal is supplied, and storing a hold-off state in the hold register when a hold-off signal is supplied;
First determination means for determining whether a hold-on state or a hold-off state is stored in the hold register when a note-off signal is supplied;
A timbre that determines whether the supplied note-off signal is for the first-type timbre or the second-type timbre when the first determination means determines that the hold-on state is stored A determination means;
A note-off hold register for storing information for identifying a sound generation channel holding the supply of the note-off information;
A tone generation channel corresponding to the note-off signal while holding off the supply of note-off information to the tone generator circuit, provided that the tone-color determination means determines that the note-off signal is for the first type timbre Note-off hold means for storing information for specifying in the note-off hold register;
Note-off supply means for immediately supplying note-off information to the sound source circuit on the condition that the tone-color determination means determines that the note-off signal is for the second type timbre;
An empty channel determination means for determining whether an empty sound channel exists when a note-on signal is supplied ;
Second determining means for determining whether a hold-on state or a hold-off state is stored in the hold register on the condition that the empty channel determination means determines that the empty sound generation channel does not exist ;
When it is determined by the second determination means that the hold-on state is stored, note-off information already supplied to the sound-generation channel and the tone generator circuit stored in the note-off hold register A truncation target channel determination means for determining a truncation target channel to be forcibly released from the sound generation channels of both channels;
An apparatus for controlling a sound source circuit, comprising: allocating means for allocating the determined truncation target channel to the note-on signal.

Images