JP3533967B2 - Tone signal generating device, computer readable recording medium on which a tone signal generating program is recorded - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone signal generator for use in electronic musical instruments, game machines, computers and the like, and a computer reading in which a musical tone signal generating program is stored.
The present invention relates to a removable recording medium.

[0002]

2. Description of the Related Art Generally, in a tone signal generator having a plurality of tone generation channels to which tone information is assigned to generate tone signals, regardless of the amount of data to be processed,
A musical tone signal was generated by always performing a certain process. However, the amount of data to be processed fluctuates greatly during the performance, so the processing method is designed with an allowance even when the amount of data to be processed is large. As a result, for example, when the amount of data to be processed is relatively small, it means that the processing capacity is not fully utilized. However, the case where the amount of data to be processed is small is, for example, the case where the number of tones that are simultaneously sounded is small. At this time, since each sound is clearly heard by the user, if the processing capability is low, the quality will be deteriorated.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is a musical tone signal in which the processing capacity can be efficiently used according to the load level of the CPU. The present invention relates to a computer-readable recording medium in which a generator and a tone signal generating program are recorded.

[0004]

SUMMARY OF THE INVENTION In a first aspect of the present invention, their respective is, when the assigned musical tone information, a plurality of tone generation channels for generating musical tone signals based on said musical tone information in the musical tone signal generating apparatus comprising, those
A CPU for controlling the operation of the tone signal generator,
According to the load level of the CPU , each of the pronunciation channels
In order to determine the mute of the tone signal and terminate the processing.
To change the threshold of . Therefore, it is possible to efficiently use the processing capability of the tone signal generator according to the load level. Claim 2
In the invention described in (1),
When applied, a musical tone signal is generated based on the musical tone information.
A tone signal generator having a plurality of sound generation channels
, The musical tone information is transmitted to the plurality of pronunciation channels.
And the processing of the plurality of pronunciation channels
Which is a CPU for executing the
The load level of the CPU is detected according to the number of stages and the negative level is detected.
Change the amount of processing executed by the CPU according to the load level
It has what you do. The invention according to claim 3
In the musical tone signal generator according to claim 1,
The CPU is independent for each sounding channel.
To control. The invention according to claim 4
In the musical tone signal generator according to claim 3,
The CPU is a tone signal generated in each of the tone generation channels.
Also controls whether or not high quality is required.
It

More specifically, the load level is divided into at least two levels. When the load level is higher than the standard level, the processing amount of at least one sound generation channel is reduced, so that the processing amount can be reduced without suppressing the generation of the required musical sound. Or
When the load level is lower than the standard level, it is possible to generate a high quality musical tone signal by increasing the processing amount of at least one sound generation channel.

There is provided means for determining which of a plurality of sound generation channels is in use, and the load level is determined at least in accordance with the number of sound generation channels determined to be in use. This makes it possible to easily determine the load level of the tone signal generating means.

More specifically, the use state of the tone generation channel must be determined to be at least one of the state in which the tone generation channel is instructed to generate a tone signal and the state in which the tone signal is generated. This makes it possible to easily determine which of the plurality of sound generation channels is in use.

Further, the musical tone information is generated by a plurality of musical tone instruction input means or an instruction of a musical tone instruction channel,
The load level is determined according to at least the number of the musical tone instruction input means or the musical tone instruction channels that have instructed the tone generation channels to generate the musical tone signals. It may be done. Further, when at least a part of the function of the musical tone signal generating means is realized by the CPU as a software program, the load level may be determined at least according to the processing capability of the CPU. The load level can be determined by combining the plurality of conditions described above.

The processing amount of the tone generation channel depends on the quality required for the tone signal generated from the tone generation channel.
By individually determining each tone generation channel, it is possible to perform processing that does not impair the quality required for the tone signal generated by each tone generation channel.

More specifically, the musical tone information is generated by an instruction of a plurality of musical tone instruction input means or musical tone instruction channels having different required qualities, and specifies the instructed musical tone instruction input means or the musical tone instruction channel. It includes information, and the processing amount of the tone generation channel can be changed according to the information specifying the tone instruction input means or the tone instruction channel included in the tone information assigned to this tone channel. Alternatively, the processing amount of the tone generation channel can be changed according to the volume level of the tone signal output by this tone generation channel. When the output level of the tone signal is high, high quality is required.

The tone generation channel outputs, as a musical tone signal, a musical tone signal to which an effect of being updated at a predetermined processing cycle is added, and the processing amount is controlled by changing the processing period. By doing so, the control of the processing amount can be realized by an inconspicuous method of changing the processing cycle of the effect update processing.

In addition to the above, if each tone generation channel is to stop the update processing of the effect when the output level of the tone signal output from this tone generation channel falls below a predetermined threshold, The processing amount can be changed at least by changing the threshold value described above. Alternatively, when each tone generation channel terminates the tone signal generation process when the output level of the tone signal output by this tone channel falls below a predetermined threshold, the tone channel processing amount The change can be performed by changing at least the threshold described above.

[0013] In the invention described in claim 5, its Resolution <br/> is, but when the assigned musical tone information, the music information
A computer in which a tone signal generation program having a plurality of sound generation channels for generating a tone signal based on
On a computer-readable recording medium
A CPU whose operation is controlled by a program
According to the load level of the CPU , each of the sound generation channels
In order to determine the mute of the tone signal and terminate the processing.
A musical tone signal generation program for causing a computer to function as a device for changing the threshold is recorded. Therefore, by causing the computer to execute this musical tone signal generation program, the musical tone signal generation processing capacity can be efficiently used according to the load level. In the invention described in claim 6,
However, when the musical tone information is assigned,
Has multiple pronunciation channels that generate musical tone signals based on
A computer in which a musical tone signal generating program is recorded
In a readable recording medium, the musical tone information is
The process of assigning to multiple pronunciation channels and the
A CPU for executing processing of a sound channel, comprising:
Load on the CPU according to the number of means for generating musical tone information
The level is detected, and the CPU executes the operation according to the load level.
Computers that change the amount of work done
A tone signal generation program for functioning has been recorded
It is a thing. In the invention described in claim 7,
The music signal generation program described in 5 and 6 is recorded in
In a computer-readable recording medium, the CP
U independently controls each sounding channel
Is. In the invention described in claim 8, in claim 7,
A computer on which the described tone signal generation program is recorded
In a computer-readable recording medium, the CPU is
Music signals generated in each sound generation channel require high quality
The control is also performed by taking into consideration whether or not it exists.

[0014]

1 is a block diagram for explaining an embodiment of a musical tone signal generating apparatus according to the present invention. In the figure, 1 is an accompaniment part, 2 is a sequencer part, 3 is a solo part, 4 is a key assigner, 5 is a sound source LSI (Large Scal).
e Integrated Circuit), 6a to 6e are channels 1 to
Sound channel of channel 64, 7a to 7e are RAMs (Random Access Memories) for channels 1 to 64.
mory), 8 is a waveform memory, 9 is an adaptive control unit, and 10 is a sound source processing unit.

The accomp section 1 is an input section for instructing a musical tone for automatic accompaniment. The sequencer unit 2 is an input unit that sequentially reads music from the storage device. The solo unit 3 is an input unit for instructing a musical sound by playing manually. Keyboard or MID
An input detection unit (not shown) that detects an input from an I (Musical Instrument Digital Interface) interface determines whether the input is an accomp or solo input, and outputs key depression information to the accomp unit 1 or the solo unit 3. In some cases, performance information of musical pieces may be sequentially input from an external sequencer via the MIDI interface. The accomp section 1, the sequencer section 2, and the solo section 3 are functional divisions of the musical tone instruction input unit according to the musical tone generation mode. These are called "devices" or "owners". When two performers play simultaneously, there may be two solo sections (two owners). There may be a case where a plurality of "owners" are assigned to one performance device, but there is also a case where one "owner" is assigned to one performance device.

The musical tone designating signals output from the respective musical tone designating input sections are predetermined musical tone designating channels ch1 to ch.
It is output to the key assigner 4 through h32. The tone instruction channel used by each tone instruction input section is preset. In the illustrated example, the accomp section 1 is ch1.
~ Ch (m) is used, and the sequencer unit 2 uses ch (m +
1) to ch31 are used, and the solo unit 3 uses ch32. Further, a tone color is set in advance for each musical tone instruction channel. The 32 musical tone instruction channels are realized by expanding 16 MIDI channels by software, for example, but the number of channels is appropriately determined. The musical tone instruction channel is sometimes called a "part".

The key assigner 4 is a sound source LSI 5 described later.
Secures the sounding channel of and truncates it. When a musical tone instruction signal for instructing the start of generation of a new musical tone (key-on, note-on) is input, the sound generation channel 6
Of a to 6e, one or a plurality of sounding channels in the standby state are designated. When a musical tone instruction signal for instructing the end (key off, note off) of a musical tone is input, the end of the musical tone is designated to the tone generation channel to which the musical tone parameter of the musical tone instruction channel included in this musical tone instruction signal is output. The number of sound generation channels that are simultaneously specified to be sounded is determined according to the tone color specified in the music sound instruction channel included in the music sound instruction, and the number of simultaneous sound generation is sometimes called a "layer".

When the tone generator processing unit 10 inputs a tone instruction signal for instructing the start of generation of a new tone and a designated tone generation channel number from the key assigner 4, the tone generator unit 10 identifies the tone pitch and velocity of the tone by the tone instruction signal. The timbre is recognized from the musical tone instruction channel number included in this musical tone instruction signal. Musical tone parameters corresponding to pitch, velocity, and tone color are read out from a memory (not shown) and stored in RAM.
Write in the designated tone generation channel area in 7. R
In the AM 7, the channel number of each sounding channel, various management information, and control information are also written.

The sound source processing section 10 also gives an effect designated by the inputted musical tone information to the musical tone signal to perform a process of giving an expression to the tone color. This process is called "parameter change" or simply "changer", and in the interrupt process or the like, the tone parameter calculation is performed based on the tone signal, and the tone parameter stored in the designated area of each tone generation channel of the RAM 7 is stored. Of these, one or a plurality of values are updated at regular intervals (predetermined resolution). The tone generator processing unit 10 transfers the tone parameter of each tone generation channel written in the RAM 7 to the corresponding tone generation channel of the tone generator LSI 5. Even if the update process is performed, the value may be the same as the value set at the previous update timing.

To give a concrete example of the effect imparted to the musical tone signal, an LFO (Low Frequency Oscillator) for the volume (output level) of the musical tone signal.
Modulation (tremolo), pitch modulation with LFO (vibrato), level control with an envelope generator (EG) for volume, level control with an envelope generator (EG) with respect to the cutoff frequency of the low-pass filter, and the like.

The sound source LSI 5 is an LSI having the function of a tone generator. For example, it has a plurality of sound generation channels (LSI channels) 6a to 6e capable of simultaneously generating musical tone signals by performing time division processing, and each sound generation channel 6a to 6e is a RAM (Random
A tone signal is generated based on the information stored in the Access Memory) 7. This sound source LSI 5 has, for example, a D
It has an SP (digital signal processor) and operates by a program.

Each of the tone generation channels 6a to 6e in use (restricted state) has a ROM (Read only memory) based on the inputted tone parameter.
Alternatively, the waveform data is read from the waveform memory 8, which is a RAM, and a tone signal is generated. Each sound channel 6a ~
The tone signals for monaural or stereo generated from 6e are combined and output to the sound system.

The functions of the accomp section 1, the sequencer section 2, the solo section 3, the key assigner 4, the sound source processing section 10, and the adaptive control section 9 in the above-described musical tone signal generating apparatus are controlled by a CPU (which will be described later with reference to FIG. 6). Central Processing Unit)
16 is realized by using a program. The adaptive control unit 9 performs processing on each sounding channel so that the processing amount of the sounding channel in use among the sounding channels 6a to 6e changes according to the load level of the CPU that realizes each function described above. The mode is adaptively changed for each sounding channel.

The load level of the CPU depends on the CPU at that time.
The processing amount itself is not detected, but is determined according to the usage mode of each sound generation channel, which is correlated with this processing amount. For example, it is grasped by the total number of sounding channels currently in use among a plurality of sounding channels. When the number of sounding channels in use increases, for example, the above-mentioned processing such as changer processing increases, and the processing of other accomp. Units 1, sequencer unit 2, etc. is also affected by this, resulting in delay in sounding of musical tone signals and rattling. Occur.

Here, each tone generation channel is (1) has not received the key-off information after receiving the key-on information, is in the key-holding state, that is, is in the tone generation instruction state of the tone signal, or ( 2) It is determined to be in use because the volume level is equal to or higher than a predetermined level, that is, the tone signal is being generated. It is detected by the key assigner 4 that the key depression hold of (1) is in progress. That the volume level of (2) is equal to or higher than the predetermined level is obtained by acquiring the level of the envelope generator (EG) of each sound generation channel of the sound source LSI 5. Considering a non-continuous sound like a piano, and conversely, a synthesizer sound that is sounded again even if the sound is muted when the key is pressed, one of the above (1) or (2) is considered. It is preferable to determine that the device in the state is in the used state.

The above-mentioned (1) key-on information and key-off information are managed by the key assigner 4. Since it is necessary to convert and evaluate the number of sound generation channels, when sound generation is instructed for a tone color having a plurality of layers, the number of sound generation channels to be used increases by the number of layers. Further, the volume level of (2) described above is the sound source L
It is identified by acquiring the level of the volume envelope generator (EG) of the tone signal output by the sounding channel of SI5.

FIG. 2 is an explanatory diagram showing an example of the transition conditions of the load level of the CPU. As the CPU load level,
It is divided into three levels A, B, and C. Normally,
It is assumed that the user is in the level B described above. In this example, as the usage mode of each tone generation channel, the number of owners who instructed each tone generation channel to generate a tone signal is also added to the CPU load level condition. This is because it is estimated that the number of key-on events that occur per unit time increases and the processing amount of the key assigner 4 increases according to the number of owners. Instead of or in addition to the total number of owners, the total number of musical tone instruction channels (parts) may be added to the CPU load level condition.

A level A is set when the number of pressed keys is 48 or more, the number of sounding channels is 56 or more, and the number of owners is 2 or more. Even if the number of pressed keys is 48 or more, if the number of sounding channels is less than 56 or the number of owners is less than 2, the level is B.
When the number of pressed keys is 8 or more and less than 48, level B is set regardless of the number of sounding channels and the number of owners. When the number of pressed keys is less than 8, the level is set to C regardless of the number of sounding channels and the number of owners. At level A of the CPU load level described above, the load is heavy, so that the processing amount of the sounding channels in use is reduced as described later. At level C, since the load is light, the processing amount of the sounding channels in use is increased, as described later, and the processing cycle (resolution) for giving an effect of expressing a musical tone is made finer, for example.

The load level of the CPU described above may be reduced to two levels, but conversely, a new combination of conditions or
The load level may be further finely divided by finely setting the numerical value level as a condition. Sound source LSI
When the musical tone signal generator is implemented as a soft sound source in a general-purpose computer without using 5, the processing capability of the CPU used in this computer may be added as a new condition. Here, the processing capacity of the CPU is C
It means the processing capacity peculiar to the PU (the type of CPU and the speed of the operation clock), and / or the ratio set by the user to occupy the processing capacity peculiar to the CPU for the tone generation processing. The conditions shown in FIG.
It is fixedly stored in the OM. Alternatively, it is supplied from the outside and stored in the RAM.

Next, the change of the processing mode for each sounding channel in use will be described. The tone generation channel in use generates a tone signal of a specified tone color and pitch based on the assigned tone parameter. At that time, an effect is imparted by the changer treatment. By changing the cycle of this changer processing, the processing amount of each sounding channel in use is controlled.

Further, in each tone generation channel in use, it is determined that the tone signal of each tone generation channel has disappeared and the threshold for changing the tone changer process or the tone signal generation process is changed to enable the tone signal. It is possible to increase or decrease the processing amount of the pronunciation channel. As a result, the overall processing amount of the CPU (CPU 16 in FIG. 6) that realizes the functions of the sound source processing unit 10 and the like is
Regardless of the load level of the CPU, the total processing amount that can be processed by the CPU can be approximated, so that the processing capacity of the CPU can be used efficiently.

FIG. 3 is an explanatory diagram showing a first example of the processing mode in the sounding channel in use. The processing mode of the sounding channels in use is determined for each sounding channel in use. In the normal level B, the changer cycle is 10 ms in each sound channel. On the other hand, in the level A, the cycle is 20 ms, and in the level C, the cycle is 5 ms. At the same time, the threshold that ends the process is
At level A-48 dB or less, at level B-
64 dB or less, and at level C, -72 dB or less. When the level of the volume envelope generator (EG) becomes lower than this threshold, the changer process is not performed thereafter. Alternatively, it is a standby channel that waits for allocation of a new pronunciation.

Level B, which is the standard CPU load level
At level A, where the load is heavier, the number of tone signals that are being sounded simultaneously is large, so even if the processing cycle of the changer is lengthened or the threshold for mute is raised, it is less noticeable. On the other hand, at level C, where the load is smaller than at level B, the number of tone signals that are being sounded at the same time is small, so by shortening the processing cycle of the changer or lowering the threshold for muffling, The improvement in the quality of the tone signal will be noticeable.

On the other hand, since the load of the tone generation processing increases when the key is turned on, it is possible to determine the amount of processing for this tone signal when a certain tone signal is newly turned on. However, in that case, the quality of the musical tone signal is determined by the timing of generation of the musical tone signal.
Further, thereafter, with the passage of time during the generation of the musical tone signal, there is a musical tone signal that is newly keyed on or keyed off, so that the processing capability becomes insufficient or surplus. As described above, it is possible to change the processing amount of the sounding channel in use by changing the update cycle of the effect addition that is not related to the sounding timing.

FIG. 4 is an explanatory view showing a second example of the processing mode in the tone generation channel in the used state. Figure 4
FIG. 4A is an explanatory diagram of a tone generation processing mode in a tone generation channel that requires high quality, and FIG. 4B is an explanatory diagram of a tone generation processing mode in another tone generation channel. In the second example, the tone generation processing is not performed uniformly for all tone generation channels 6a to 6e, but the tone signal generated by each tone generation channel requires high quality. The processing mode is changed depending on whether there is any.

Whether or not it is judged as a musical tone signal requiring high quality is determined according to (1) the owner who has instructed to generate the musical tone signal currently being sounded. That is, the sounding channel instructed to be sounded by the important solo section 3 shown in FIG. 1 is set as the sounding channel of a musical sound requiring high quality. Alternatively,
(2) A musical tone signal having a large output level requires high quality. For example, a tone signal having a volume envelope generator (EG) level of -24 dB or higher is set as a tone signal requiring high quality. It may be determined that a music signal that satisfies both of these conditions is a tone signal that requires high quality.
Alternatively, instead of the condition (1), it may be determined according to the importance of the musical tone signal designated in the musical tone instruction channel (part) that has instructed to generate the musical tone signal currently being generated.

FIG. 4A shows a processing mode in a tone generation channel of a tone signal requiring high quality. In the level A as well as the normal level B, the changer period is 10 ms. On the other hand, in level C, it takes 5 ms. The threshold for terminating the process is −64 dB or less at level A and level B,
At level C, it should be -72 dB or less. Volume envelope generator (E
When the level of G) is lowered, the changer process is not performed thereafter. Alternatively, it is set as a standby channel that waits for allocation of a new pronunciation, assuming that it has been muted.
FIG. 4B shows a processing mode in the tone generation channels of other musical tone signals. In the illustrated example, the processing mode is the same as that shown in FIG.

FIG. 5 is an explanatory view showing a third example of the processing mode in the sounding channel in use. Figure 5
(A) shows a processing mode in the tone generation channel of a tone signal requiring high quality, which is the same as the processing mode shown in FIG. 4 (a). FIG. 5B shows a processing mode in the tone generation channels of other musical tone signals. In this example, the processing mode is determined after detecting the level of the volume envelope generator (EG) of the sound generation channels 6a to 6e in use.

In the illustrated example, each sound generation channel 6a-6
The level of the volume envelope generator (EG) of e changes the cycle of the changer when the level is A or B. It should be noted that the threshold for terminating the processing is determined even when the level of the volume envelope generator (EG) is large, but this is for the purpose of making no trouble when referring to this table. The load level of the CPU is level A, and the level of the volume envelope generator (EG) is -12d.
If it is less than B, the changer cycle is 20 ms,
If it is 12 dB or more, the changer cycle is 10 ms. The load level of the CPU is level B, and the level of the volume envelope generator (EG) is -18 dB.
If it is less than, the changer cycle is set to 20 ms, and -1
If it is 8 dB or more, the changer cycle is 10 ms. When the CPU load level is level C, the changer cycle is uniformly set to 5 ms.

The description of the specific example of the processing mode is finished above. The processing modes shown in FIGS. 3 to 5 are tabulated and stored in advance in the ROM in a fixed manner or supplied from the outside. It is stored in RAM and used.

FIG. 6 is an explanatory diagram of a hardware configuration for realizing an embodiment of the musical tone signal generating apparatus of the present invention.
The bus line 11 includes a sound source LSI 12, a flexible magnetic disk (FDD), a hard magnetic disk (HD
D), CD-ROM (Compact Disk-Read Only Memor)
y) External storage device 13 such as device, liquid crystal display device, CRT
Display 14 such as (Cathode Ray Tube), MIDI (Musical Instrument Digit) for connecting to external equipment
al Interface) Interface 15, CPU16, R
The AM 17, the ROM 18, and the input device 19 are connected.

As the input device 19, there are various setting operators, performance operators such as a pitch bend wheel, or a keyboard. The tone signal output of the sound source LSI 12 is D / A
It is converted into an analog signal by the (digital / Anarog) converter 20, output to the sound system 21, and emitted from the speaker. A communication interface such as RS232C or IEEE1394 may be used for connection with an external device such as a host computer. Further, it may be connected to a server on the Internet via a modem.

Input device 19, MIDI interface 1
A musical tone instruction signal is input from a MIDI keyboard, an external sequencer or the like via 5. The CPU 16 uses the RAM 17 based on the program and data stored in the external storage device 13 or the ROM 18, and uses the RAM 17 to display the accomp section 1, the sequencer section 2, the solo section 3, the key assigner 4, and the sound source processing section 10 shown in FIG. , Executes the respective functions of the adaptive control unit 9, and outputs the tone parameters and the like to the tone generator LSI 12.
Also, setting parameters and the like are displayed on the display 14, and musical tone parameters are output to external MIDI equipment via the MIDI interface 15. Sound source LSI12
Processes the tone parameters, ROM 18 or RAM
Using the waveform data stored in 17, a plurality of musical tone signals capable of simultaneous sound generation are generated, and musical tone waveforms are output to the sound system 21 via the D / A converter 20.

This tone signal generator is constructed as an electronic musical instrument. Alternatively, it is configured as a sound source device alone or as a sound source device on a sound card built into a computer. Alternatively, the tone generation function can be realized by the CPU 16 as a so-called soft tone generator under the operating system of the computer without using the tone generator LSI 12. In this case, the CPU 16
Also executes the tone signal generation process for the tone generation channel of the tone generator LSI 12. The processing amount of this tone signal generation processing also changes depending on the number of tone generation channels in use. The software sound source program is supplied from a CD-ROM or a server on the network via a communication line, and stored in the hard magnetic disk of the external storage device 13.

7 to 9 are flow charts for explaining the operation of the embodiment of the musical tone signal generating apparatus of the present invention. FIG. 7 is a flowchart of tone generation / silence processing of a musical sound. An event detection block (not shown) is activated when key-on or key-off is detected. FIG. 8 shows C
It is a flowchart of the process which determines the load level of PU. It is activated periodically under the control of interrupts or multitasking to determine the CPU load level. Therefore, the CPU load level is updated at any time, for example, in a cycle of about 10 ms. FIG. 9 is a flowchart of the changer process. It is activated periodically, and the cycle is, for example, about 5 ms. Depending on the load level of the CPU detected by the flow chart of FIG. It is determined whether to thin out (skip).

S31 of the tone generation / silence-reduction processing shown in FIG.
In step 1, key press or key release information (key on, key off) is received from an event detection block (not shown). In S32, the musical tone instruction channel (part) in which the key-on / key-off event has occurred is specified. In S33, it is determined whether the key is on. If the key is on, the process proceeds to S34, and if the key is off, the process proceeds to S36. This determination is, for example,
When the musical tone instruction signal transmitted from each owner to the key assigner 4 through the musical tone instruction channel is a MIDI message, it is determined based on the velocity value of the note-on message instructing key-on. When the velocity value is 0, it is determined that the key is off. S to be described later
The processing of 34, S35, S36, and S37 is performed for each layer in order from the first layer of the musical sound. The number of layers is preset for the tone color set in the musical tone instruction channel.

In S34, the key-on counter is incremented, and in S35, the tone generation channel to which one layer of the tone generation instruction is assigned is designated. In other words, the sound generation channels 6a to 6a in FIG.
One tone generation channel in 6e that is on standby is determined. On the other hand, in S36, the key-on counter is decremented, and in S37, the tone generation channel to which this musical tone layer is already assigned is designated.

In S38, it is determined whether or not the counting process has been completed for all layers. If you have not finished counting all layers,
The processing is returned to the original S34 or S36, and when the processing is completed, the processing is advanced to S39. In S39,
Based on the specified musical tone instruction channel, the musical tone parameters are read from the memory and the musical tone parameters are stored in the RAM.
It is set to the area of the designated sounding channel of.

As described above, the key-on counter counts the number of keys in the hold state that have been pressed and not yet released, with 1 for each tone color layer. The count value of the key-on counter serves as an index indicating the load amount of CPU processing.

In the CPU load level determination shown in FIG. 8, the sounding channel number i, the sounding counter, and the owner counter are initialized to 0 in S41. In S42, the current level of the volume envelope generator (EG) of the sound generation channel (i) is acquired. S43
At, it is determined whether or not this sounding channel is sounding based on the level acquired in S42. For example, if it is -80 dB or more, it is determined that the sound is being generated. When it is determined that the sound is being generated, the process proceeds to S44, and when it is determined that the sound is not being generated, S4.
The process proceeds to 5.

In S44, the tone generation counter is incremented. In S45, the owner name of the tone generation channel (i) is acquired based on the number of the tone instruction channel that has instructed the tone generation of the tone signal of this tone channel, and the value of the owner counter is set. That is,
The owner counter is incremented each time the owner name of a new name is acquired. In S46, the channel number i of the tone generation channel (i) is incremented. In S47, the process proceeds to S48 when the scanning of all the tone generation channels is completed, and the process is returned to S42 if not completed.

As a result, when the process proceeds to S48, the total number of sounding channels that are sounding out of all sounding channels is acquired as the count value of the sounding counter. In addition, the total number of owners who have instructed the tone generation channel that is generating a tone signal to be generated is acquired as the value of the owner counter. The total number of sound generation channels and the total number of owners during the sound generation are also indexes indicating the load amount of the CPU. The number of keys in the hold state is acquired as the count value of the key-on counter in the sound generation / mute processing shown in FIG. In S48, the CPU load level is determined from the conditions shown in FIG. 2 based on the count values of the sound generation counter, the key-on counter, and the owner counter.

In the changer process shown in FIG. 9, S
In 51, the CPU load table described with reference to FIG. 3 is drawn according to the current CPU load level determined in S47 of FIG. 8 to acquire the changer cycle and the threshold. In S52, the tone generation channel number i is initialized to 0. In S53, the level of the volume envelope generator (EG) of the tone generation channel (i) is acquired.

When the processing mode shown in FIG. 4 is adopted, the changer cycle and threshold change depending on whether or not the tone generation channel (i) is a channel requiring high quality. If the condition that the tone generation channel (i) is the tone generation channel of the tone signal requiring high quality is that the tone level of the tone signal being sounded is high, the process of S51 is performed. Needs to be executed after S53. As a condition that the tone generation channel (i) is a tone generation channel of a tone signal that requires high quality, when determining by the importance of the owner who instructed the tone generation of the tone signal, the owner can be known from the tone instruction channel number. S51 is
The position may be as shown. Even when the processing mode shown in FIG. 5 is adopted, it is necessary to acquire the volume level of the tone signal being sounded in order to determine the load level of the CPU.
Must be done after 53.

At S54, the acquired envelope is acquired.
The level of the generator (EG) ends the tone generation process.
Determine whether it is above the threshold level
If it is above, the process proceeds to S55, and if it is below,
The process proceeds to S59. This threshold is S
51, obtained according to the CPU load level, etc.
It is a value. Note that the pronunciation channel (i) that is not in use
If so, the process proceeds to S59. In S55,
Of the changer counter corresponding to the sound channel (i)
Value c_iDecrement. Changer counter value
c_iIs a positive integer value proportional to the changer period
It For example, if 5 ms is 1, 20 ms and 10 ms are
It corresponds to 4, 2 and, in the step of S55, the chain
Jar counter value c _iIs decremented. Power off
In the initial state, all sound channels are changed.
Since the initial period of the charger is set to the standard 10 ms,
Value of the changer counter c_iIs 2 and decrement
When it is done, it becomes 1.

In S56, it is determined whether or not the value of the changer counter c _i has become 0. When the value becomes 0, the process proceeds to S57, and when it is not 0, S62.
Proceed to. At 57, a changer processing operation for updating effect addition is executed. After executing the changer processing operation in S57, in S58, S
Based on the changer period obtained at 51,
The value of changer counter c _i is determined, and the process proceeds to S62. For example, if the changer period is 20 ms, the value of changer counter c _i is set to 4.

On the other hand, if the level is not equal to or higher than the threshold level for ending the process in S54, the process proceeds to S59. In S59, it is determined whether the key-off process has not been executed. If not executed, the process proceeds to S60, and if not executed, the process proceeds to S62. S
In 60, the key-off process is executed, the key-on counter is decremented in S61, and the process proceeds to S62. In S62, the tone generation channel number i is incremented, and the process proceeds to S63. In S63, it is determined whether or not scanning of all sound generation channels (64 channels) has been completed. If not completed, S5 is executed.
The processing is returned to 3, and the same processing is performed for the sounding channel of the next number. When completed, the one start-up process of this changer process is completed.

Although the total number of owners is counted in FIG. 8, the total number of MIDI channels or the total number of parts may be counted. In the above description, the change of the effect application update cycle is executed without distinguishing all of the plurality of effects. But,
The update cycle may be different depending on the content of the effect to be given. In addition, whether or not to change the update cycle according to the load level of the CPU may be determined according to the content of the effect to be provided, or the update cycle according to the load level of the CPU may be determined according to the content of the effect to be provided. The control may be different. For example,
In the level A, the changer may perform the filter processing in 20 msec cycle units, and the processing using the LFO may be performed in 10 msec. Further, in this example, the tone color data of the tone color being pronounced for each tone generation channel is further referred to, and the LFO is classified into a tone color set deeply and a tone color set shallowly. The correspondence may be changed according to the tone color data, such that the processing is performed at a cycle of 10 msec and the latter is processed at a cycle of 20 msec. Furthermore, the correspondence for each CPU load level may be tabulated for each effect content for each timbre.

[0059]

As is apparent from the above description, the present invention flexibly changes the processing amount of the musical tone signal generating device in use according to the load level of the CPU , thereby processing the musical tone signal generating device. The effect is that the ability can be used efficiently. When the number of generated musical tones is large, the deterioration of the quality due to the reduction of the processing amount of the sounding channels in use is not noticeable. Further, when the number of generated musical tones is small, the increase in the processing amount of the sounding channels in use improves the quality of each sound.

[Brief description of drawings]

FIG. 1 is a block configuration diagram for explaining an embodiment of a tone signal generating apparatus of the present invention.

FIG. 2 is an explanatory diagram showing an example of a load level transition condition of a CPU.

FIG. 3 is an explanatory diagram showing a first example of a processing mode in a sounding channel in a use state.

FIG. 4 is an explanatory diagram showing a second example of a processing mode in a sounding channel in a use state.

FIG. 5 is an explanatory diagram showing a third example of a processing mode in a sounding channel in use.

FIG. 6 is an explanatory diagram of a hardware configuration for realizing an embodiment of the musical tone signal generating apparatus of the present invention.

FIG. 7 is a flowchart of tone generation / mute processing for explaining the operation of the embodiment of the musical tone signal generating apparatus of the present invention.

FIG. 8 is a flowchart of a process for determining the load level of the CPU, for explaining the operation of the embodiment of the musical tone signal generating apparatus of the present invention.

FIG. 9 is a flowchart of changer processing for explaining the operation of the embodiment of the musical sound signal generating apparatus of the present invention.

[Explanation of symbols]

1 Accomp section, 2 Sequencer section, 3 Solo section, 4
Key assigner, 5 sound source LSIs, 6a to 6e Channel 1 to channel 64 sounding channels, 7 RAM, 8
Waveform memory, 9 Adaptive control unit, 10 Sound source processing unit

Claims (8)

(57) [Claims] 1. A respectively, when the assigned tone information, a tone signal generator odor having a plurality of tone generation channels for generating musical tone signals based on said musical tone information
Te, met CPU controls the operation of the tone signal generation device
Te, according to the load level of the CPU, each sound Cha
Panel determines whether the tone signal is muted and ends the process.
Which changes the threshold for tone signal generation device comprising a Turkey which have a. 2. Each is assigned musical tone information.
Occasionally, a musical tone signal is generated based on the musical tone information.
A musical tone signal generator with several sound channels
Te, allocating the music information to said plurality of tone generation channels
C for executing processing and processing of the plurality of sound generation channels
PU, depending on the number of means for generating the musical tone information
Detects the load level of the CPU and responds to the load level.
A musical tone signal generating device characterized in that the musical tone signal generating device changes the amount of processing executed by the CPU . 3. The CPU is provided for each of the sound generation channels.
The control according to claim 1, wherein the control is independently performed.
On-board tone signal generator. 4. The CPU controls each of the sounding channels.
It is also controlled considering whether or not the generated tone signal requires high quality.
The tone signal generation according to claim 3, wherein the tone signal generation is performed.
Raw equipment. 5. A tone signal generation program having a plurality of tone generation channels, each of which generates a tone signal based on the tone information when the tone information is assigned.
Recorded computer readable recording medium odor
Te, C where the operation by the tone signal generation program is controlled
A PU, depending on the load level of the CPU, the
Judgment and processing of mute of tone signal in each sound channel
A computer-readable recording medium on which a musical tone signal generating program for causing a computer to function is recorded, which changes a threshold for ending the computer . 6. Each is assigned musical tone information.
Occasionally, a musical tone signal is generated based on the musical tone information.
A tone signal generation program with a number of pronunciation channels
Recorded computer readable recording medium odor
Te, allocating the music information to said plurality of tone generation channels
C for executing processing and processing of the plurality of sound generation channels
PU, depending on the number of means for generating the musical tone information
Detects the load level of the CPU and responds to the load level.
Then, the tone signal generation process for causing the computer to function as a device that changes the amount of processing executed by the CPU.
A computer-readable record of the program
Medium. 7. The CPU is provided for each of the sounding channels.
7. The control according to claim 5, characterized in that
A computer in which the tone signal generation program described above is recorded
A readable recording medium. 8. The CPU controls each of the tone generation channels.
It is also controlled considering whether or not the generated tone signal requires high quality.
8. The musical tone signal generation according to claim 7, wherein the musical tone signal generation is performed.
Computer readable coded raw program
recoding media.