JPH11202868A - Musical sound generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the processing speed of an arithmetic control processing part irrelevantly to specified control contents and to enables quick-response musical sound generation by the musical sound generating device wherein a waveform memory sound source part and the arithmetic control processing part share a waveform program memory. SOLUTION: The musical sound generating device 1 is so constituted that an externally connected waveform program ROM 100 is shared by an internal sound source part 20 and a CPU 30. The musical sound generating device 1 is provided with five kinds of operation mode and two kinds of sound source mode, i.e., 32-phonic and 16-phonic sounding modes, and the sound source modes are made to correspond to the operation modes. When an operation mode is selected, the corresponding sound source mode is set in a mode register 23a. When the set value indicates the 32-phonic simultaneous sounding mode, an access management part 10 sets the right to access the waveform program ROM 100 twice for every sounding channel to the sound source part 20 and when the set value indicates the 16-phonic simultaneous sounding mode, the access management part 10 sets the right to access the waveform program ROM 100 twice for every odd-numbered sounding channel to the sound source part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tone generator which shares a waveform / program memory with a waveform memory tone generator and an arithmetic control processor.

[0002]

2. Description of the Related Art Conventionally, as a tone generator which commonly uses a waveform / program memory for a waveform memory tone generator and an arithmetic control processor, for example, a PCM (Pulse Code Modulatio)
n) LSI (Large Scale Integrate cipher) in which a sound source section and a CPU (Central Processing Unit) are provided in one chip
rcuit) configured to connect externally a waveform / program memory storing digital waveform data recorded in the PCM format read by the PCM tone generator and a control program executed by the CPU. Are known.

In such a one-chip LSI, the PCM tone generator and the CPU alternately use, for example, time slots obtained by time division, that is, time throttles for accessing a waveform / program memory. Shared the waveform and program memory. Since the number of sounds (number of sounding channels) is usually fixed, the PCM tone generator accesses the waveform / program memory a predetermined number of times for each sounding channel.

[0004]

However, in the above-described conventional tone generator, that is, in a one-chip LSI, a PC
Since the number of times the CPU accesses the waveform / program memory is limited by the number of times the M tone generator accesses the waveform / program memory, the processing speed of the CPU becomes insufficient and the sounding of musical tones is delayed. There was something.

[0005] That is, although the CPU is used with such a capability that there is no delay in the tone generation processing when the normal control processing is designated,
For example, when a process that gives a heavy load to the CPU, such as finer tone control, advanced accompaniment processing, and image processing, is specified, the CPU processing speed becomes insufficient due to the restriction on the waveform and program memory of the CPU. In some cases, for example, in the case of the musical sound generation processing, the CPU capacity that can be spent on this processing is insufficient, and the sound generation is delayed.

SUMMARY OF THE INVENTION The present invention has been made in view of this point. In a musical sound generating apparatus in which a waveform / program memory is shared by a waveform memory tone generator and an arithmetic control processor,
It is an object of the present invention to provide a musical sound generating device capable of securing a processing speed of an arithmetic control processing unit irrespective of designated control contents and generating a musical sound with high response.

[0007]

In order to achieve the above object, according to the present invention, a plurality of channels of tone waveforms are generated based on waveform data read from a waveform / program memory for storing waveform data and a control program. A waveform memory sound source unit, and an arithmetic control processing unit that performs arithmetic control based on a control program read from the waveform / program memory, wherein the waveform / program memory is processed by the waveform memory sound source unit and the arithmetic control processing unit. A shared tone generating device, comprising: a control mode designating means for designating any one of a plurality of control modes respectively indicating a plurality of control contents executed by the arithmetic and control processing unit; A tone generator for generating a tone waveform by reading waveform data from the waveform / program memory according to the mode. The number of channels of the channels is switched, and the time ratio between the time when the arithmetic control processing unit reads the control program from the waveform / program memory and the time when the waveform memory sound source unit reads the waveform data from the waveform / program memory is switched. And control means for controlling.

Here, the control contents indirectly indicate the magnitude of the processing load applied to the arithmetic and control unit. Therefore, when the selected control mode corresponds to a mode that places a large load on the arithmetic control processing unit, the control means switches the number of channels of the musical tone waveform to be small, and the arithmetic control processing unit The time ratio is switched so that the time for reading the control program from the memory becomes longer. On the other hand, when the selected control mode corresponds to a mode in which the load on the arithmetic and control processing unit is small, the control unit switches so as to increase the number of channels of the musical tone waveform and sets the waveform memory sound source unit to the waveform / program. The time ratio is switched so that the time for reading the waveform data from the memory becomes longer.

Preferably, the channel from which the reading of the waveform / program memory is not performed due to the switching is performed with respect to a tone waveform generated by reading waveform data from the waveform / program memory on a channel other than the channel. , For adding a new tone color control.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a tone generator 1 according to a first embodiment of the present invention. The tone generator 1 is a one-chip tone generator incorporating a tone generator 20 and a CPU 30. A waveform / program ROM 100 constituted by an LSI and connected to the outside of the tone generator 1
Are shared by the sound source unit 20 and the CPU 30.

Before describing the detailed configuration of the tone generator 1, the main functions of the tone generator 1 and an outline of a control process for realizing the functions will be described. First, the tone generator 1
Has mainly the following functions.

That is, 1) The following five operation modes are provided, and the user can select any one of the operation modes. Operation mode = 0; Normal mode Operation mode = 1; Two-sequence filter use mode Operation mode = 2; Normal Automatic accompaniment mode Operation mode = 3; Special automatic accompaniment mode Operation mode = 4; Game mode 2) The following two types of sound source modes are provided, and this sound source mode is uniquely selected and determined according to the above operation mode. Sound source mode = 0; 32-tone simultaneous sound generation mode (operation mode =
(Selected when 0, 2) Sound source mode = 1; 16 sound simultaneous sounding mode (operation mode =
Of the two types of functions, the former 1) function is operated when the user operates an operation mode setting operator (not shown) of the panel display & panel operator 104. Is stored in a predetermined area of the RAM 40. The function of the latter 2) is realized as follows.

That is, in the tone generator 1, as described above, the tone generator 20 and the CPU 30 have the waveform / program R
The OM 100 is configured to be shared, in other words, the waveform / program ROM 100 can be accessed from any of the tone generator 20 and the CPU 30 and the contents thereof can be read. And
Within one sample period (period required to generate one sample of two sets of parallel waveform data of stereo), waveform data of up to 32 channels (minimum of 16 channels) (as will be described later, stereo 2
One sample of parallel waveform data of the series is generated)
, One sample period is time-divided into 256 time slots, and the sound source unit 20 is generated for each time slot.
Or which of the CPU 30 is the waveform / program ROM 1
00 is accessed.

FIG. 3 is a diagram showing an example of the access timing to the waveform / program ROM 100. The time division channel (CH) 1 of the sample period n starts from the middle of the time division channel (CH) 31 of the sample period n-1. Shows the access timing up to the middle. Where n is
Sample synchronization number, which is an arbitrary integer value.

In FIG. 1, a system counter refers to a counter (not shown) provided in the tone generator 20 and counts from 0 to 255 in synchronization with a system clock. A time slot is defined according to the count value of the system counter, and the right to access the waveform / program ROM 100 in the time throttle is determined according to the count value and the tone generator mode.

Mode 0 means that the sound source mode is a 32-tone simultaneous sounding mode. At this time, as shown in FIG. 2, the sound source unit 20 is controlled by four periods of the system clock (for four time throttles). (Corresponding time) once to access the waveform / program ROM 100. Mode 1 means that the sound source mode is the 16-note simultaneous sounding mode. At this time, as shown in FIG.
0 accesses the waveform / program ROM 100 once every four periods of the system clock only during the period of the odd-numbered channel.

When the waveform / program ROM 100 is accessed, the tone channel 1ch is accessed twice. In the tone generator 1 according to the present embodiment, the waveform data to be read is a waveform / channel. Since it is configured to allow the data to be located between two adjacent waveform data stored in the program ROM 100, when the intermediate waveform data is designated to be read, the waveform data is Two adjacent waveform data, that is, two adjacent waveform data stored in the waveform / program ROM 100 are read, and the intermediate waveform data (target waveform data) is calculated by interpolating the two waveform data. This is because they do so.

In this way, the access right to the waveform / program ROM 100 is controlled in accordance with the tone generator mode, and in accordance with this, switching between the tone generation for 32 channels and the tone generation for 16 channels is performed.

Returning to FIG. 1, the tone generator 1 is constituted by a one-chip sound source LSI (hereinafter, when the tone generator 1 does not need to be clearly distinguished from the tone generator LSI, it is represented by "sound source LSI"). For convenience of explanation, R
OM-configured waveform / program memory (RO
M) 100, DAC (Digital-to-Analog Converter) 10 for converting a digital tone signal into an analog tone signal
1. A sound system 102 such as an amplifier or a speaker for converting the analog tone signal into sound, a keyboard 103 for inputting pitch information, for example, a liquid crystal display (LCD) and various controls (switches) are provided. Panel display & panel operator 104 and MID
A MIDI terminal 105 for inputting an I (Musical Instrument Digital Interface) signal (code) is also shown.

The tone generator LSI 1 has a waveform / program ROM.
Access management unit 10 that manages the access right to 100
And a tone generator 2 for generating a digital tone signal based on the waveform data read from the waveform / program ROM 100.
0, a CPU 30 for controlling the entire sound source LSI 1, a RAM 40 for temporarily storing performance data, various input information, a calculation result, and the like; a timer 50 for measuring an interrupt time and various times in a timer interrupt process; , A parallel I / O 70 to which the panel display & panel operator 104 is connected,
It mainly comprises a MIDI interface 105 for transmitting and receiving MIDI signals input / output from the IDI terminal 105. And each component 10-80
Are connected to each other via a bus 90.

The CPU 30 receives the MIDI data received via the MIDI terminal 105 and the MIDI interface 105.
The tone generator 20 is controlled according to the DI signal to generate a tone signal.

In this embodiment, the keyboard 103 has a built-in key-press detection circuit (not shown).
A key pressed / released by a player (user) is detected, and a detection signal of a format similar to the MIDI signal such as note-on, note-off, velocity, and after-touch is serialized as serial data according to the detection result. Supply to O60. The CPU 30 controls the tone generator 20 in accordance with the detection signal to generate a tone signal, and outputs the detection signal from the MIDI terminal 105.

The panel display & panel operator 104 has, for example, a display and an operator provided on one panel surface, and each input / output terminal (both not shown) of the panel display and the panel operator. Are parallel I / O70
It is connected to the. Display data displayed on the panel display is controlled by the CPU 30 via the parallel I / O 70. A scan signal output by the CPU 30 is supplied to the panel operator via the parallel I / O 70,
The PU 30 receives the scan result via the parallel I / O 70, detects the operation state of each operation element, and controls the entire sound source LSI 1 according to the detection result.

Although not shown, the panel controls include, for example, a tone switch (SW) for selecting a tone,
An operation mode switch for selecting an operation mode, a start / stop switch for starting / stopping automatic accompaniment, a wheel for controlling tempo and pitch, and the like are provided.

The sound source section 20 has a waveform / program ROM 1
In order to read out one waveform data from a plurality of waveform data stored in 00, a read circuit 21 for generating address data of an address in which the waveform data is stored in a time-division manner, and a read circuit 21 generated by the read circuit 21 The waveform data read out in accordance with the received address data is subjected to various processes described below to generate a digital tone signal in a time-division manner, and a register for storing various information for generating a tone signal. Sound source register 23
, And is mainly configured.

As described above, in the present embodiment, the target waveform data is not always stored in the waveform / program ROM 100. Therefore, the read circuit 21 stores the real-valued address data having an integer part and a decimal part. (AD)
Occurs. Since the integer part of the real-valued address data corresponds to the address of the waveform / program ROM 100, the integer part is supplied to the address input terminal of the waveform / program ROM 100 via the access management unit 10, and the decimal part corresponds to the integer part. In order to generate the target waveform data by interpolating the read and read waveform data, the waveform data is supplied to the waveform calculation unit 22. The readout circuit 21 is interconnected with the tone generator register 23, and its address generation is controlled based on the set value set in the tone generator register 23.

The waveform calculation section 22 is connected to the data output terminal of the waveform / program ROM 100 via the access management section 10, and as described above, the address specified by the integer part of the address data generated by the read circuit 21. Is read from the data output terminal,
It is supplied to the data input terminal of the waveform calculation section 22. The waveform calculator 22 interpolates the waveform data by a predetermined method according to the decimal part of the address data.

The tone generator register 23 has a mode register 23a for storing numerical data corresponding to the tone generator mode. In addition, the tone generator register 23 has a maximum value of the time division channels (sound generation channels) (the above-mentioned 32 channels in this embodiment). 32 channel registers for storing channel control data for independently controlling the pitch, filter, volume, etc. of each other, and an effect register for storing effect control data for controlling an effect to be applied to a generated tone signal (both of them). (Not shown). The mode register 23a is connected to the waveform calculation unit 22, and the waveform calculation unit 22 switches the mode of the waveform calculation process according to the mode value set in the mode register 23a.

FIG. 2 is a diagram for explaining a detailed configuration of the waveform calculator 22. In the present embodiment, the waveform calculation unit 22 is configured by a DSP (Digital Signal Processor). Therefore, each block in the figure mainly has a function executed by software instead of hardware. Means.

In FIG. 2, a waveform calculator 22 interpolates the read waveform data to generate target waveform data, and filters the interpolated waveform data. A frequency component control unit (DCF) 21b, a volume change control unit (EGM) 21c that multiplies the filtered waveform data by an envelope generated by an envelope generator (EG) 21d, and a time division channel. Generated waveform data, that is, volume change control unit 2
An addition control unit (ACC) 21e that adds (accumulates) the waveform data of each channel output from 1c for all channels (32 ch) to generate stereo two-series waveform data.
A sound effect control unit (DSP) 21f for applying an effect to the generated stereo two-series waveform data; and converting the stereo two-parallel parallel waveform data to which the effect has been applied into serial data, And an output control unit (PSO) 21g for outputting the data to the control unit.

The waveform interpolator 21a is supplied with the decimal part of the address data generated by the readout circuit 21, and is supplied with the waveform data read from the waveform / program ROM 100. This waveform data is interpolated by a predetermined interpolation method (for example, linear interpolation) according to the value of the decimal part of the address data.
Further, the waveform interpolation unit 21a includes an output register 21a1 for storing the interpolation result of the previous channel, and the output register 21a1 is set when the value set in the mode register 23a is "1", that is, when the sound source mode is 16 In the simultaneous sound generation mode, the interpolation result of the immediately preceding channel is stored. In the current channel, that is, the channel for which the reading of the waveform data is not performed, the waveform is calculated based on the interpolation waveform data of the previous channel stored in the output register 21a1. Perform the operation. That is, in the 16-note simultaneous sound generation mode, the same interpolated waveform data is added to the frequency component control unit 21b in the odd-numbered channel and the next even-numbered channel.
Different types of waveform calculation processing are performed for each channel by the volume change control unit 21c and the envelope generator 21d. That is, in the present embodiment, 3
In the two-tone simultaneous sounding mode, one-system filtering and envelope addition are performed on the generated 32 sound waveform data, and in the 16-note simultaneous sounding mode, the two-line waveform data of the 16 sound generated are respectively applied. An envelope for filtering is provided. Thus, in the 16-note simultaneous sound generation mode, although the number of sounds is reduced, more complex tone color control can be performed on the waveform data of each channel to be generated.

A more detailed configuration and operation of the tone generator 1 are disclosed in Japanese Patent Application Laid-Open No. 8-23470.

The control process executed by the tone generator 1 having the above-described configuration will be described below with reference to FIGS.

FIG. 4 shows the tone generator 1, in particular, the CPU 30.
5 is a flowchart showing a procedure of a main program executed by the computer.

In the figure, first, initialization such as clearing of the RAM 40 is performed (step S1).

Next, the occurrence of the following activation factors is checked (step S2).

Activating factor 1: A MIDI event has occurred Activating factor 2: The user has operated one of the panel display & panel operators 104, and that operational event has been detected. Activating factor 3: In the following step S3, it is determined whether any of the above-mentioned activation factors 1 to 3 has occurred, and it is determined whether any of the activation factors 1 to 3 has occurred. If not, the process returns to step S2. If any of the activation factors 1 to 3 occur, the process proceeds to step S4 to determine which activation factor has occurred.

As a result of the determination in step S4, when "activation factor 1" occurs, the process proceeds to step S5, and a MIDI process corresponding to the generated MIDI event is executed. When "activation factor 2" occurs, the process proceeds to step S6. Then, a switch (SW) process corresponding to the generated switch event is executed, and when "activation factor 3" occurs, the process proceeds to step S7, and other processes corresponding to the generated event are executed.

After completing any of steps S5 to S7, the process returns to step S2 to repeat the above-described processing.

FIG. 5 is a flowchart showing a procedure of an operation mode setting operation process which is started when the user operates the operation mode setting operator of the panel display & panel operation device 104. This is one process during the switch process in step S6.

In the figure, first, the operation mode is set based on the data input by the user operating the operation mode setting operator (step S11). Here, the operation mode indicates the five types of modes described above, and the input data indicates integer value data corresponding to each operation mode.

Next, after the sound source mode is set based on the set operation mode (step S12), the operation mode setting operator processing ends. Since the operation mode and the tone generator mode are associated with each other as described above, the tone generator mode corresponding to this association is stored in the mode register 23.
is set to a.

FIG. 6 is a flowchart showing the procedure of the note-on event processing when the 32-tone simultaneous sound generation mode is set as the sound source mode (sound source mode = 0). It is. This processing is started when a note-on event of MIDI data is input from the MIDI terminal 105.

In the figure, first, the note number NN and velocity VEL of the note-on event are taken into, for example, a work area of the RAM 40 (step S21).

Next, a search is made for an empty channel among the 32 sound channels, and sound is assigned to the channel (step S22). Here, in this embodiment, the search for an empty channel is performed from channel 1 to channel 3.
This is performed by sequentially detecting the current volume envelope of each channel up to two channels, and searching for the minimum value. That is, the channel having the smallest volume envelope is determined as an empty channel.

Next, tone control data corresponding to the note number NN and the velocity VEL of the currently set tone color is set in the register of the channel to which the tone is assigned (step S23).

Then, a note-on is transmitted to this channel to generate a tone signal (step S24), and thereafter, the present note-on event processing is terminated.

FIG. 7 is a flowchart showing the procedure of the note-on event processing when the 16-tone simultaneous sound generation mode is set as the sound source mode (sound source mode = 1).

In the figure, first, at step S21
Similarly, the note number NN and velocity VEL of the note-on event are taken into the work area of the RAM 40 (step S31).

Next, 16 channels (odd channels)
A search is made for an empty channel among the sound channels, and sound is assigned to the channel (step S32). Here, the search for an empty channel is performed in the step S22.
Similarly to the above, the detection is performed by sequentially detecting the current volume envelope of each channel from channel 1 and searching for the minimum value. However, the difference from step S22 is that the volume envelope of the odd-numbered channel is to be detected and searched, and the detection operation is not performed for the volume envelope of the even-numbered channel. Since the process of detecting and searching for the volume envelope imposes a considerable load on the CPU 30, the load on the CPU 30 is significantly reduced in the sound source mode = 1 compared to the sound source mode = 0 in the sound source mode = 1.

Next, the same tone control data as in step S23 is set in the register of the channel to which the tone is assigned, and a predetermined part of the entire tone control data is set in the next channel (even channel). , That is, data for performing a waveform calculation process of a different type from that of the immediately preceding odd-numbered channel (step S33).

Then, note-on is transmitted to the odd-numbered channel and the even-numbered channel to generate a tone signal (step S34), and thereafter, the present note-on event process ends.

Next, a tone generator according to a second embodiment of the present invention will be described.

When the tone generator mode is the 16-note simultaneous sound generation mode, the tone generator according to the first embodiment uses the interpolated waveform data generated in the immediately preceding channel for the channel that does not access the waveform / program ROM 100. Is used to generate the desired waveform data, whereas the tone generator according to the present embodiment uses the F
A modulated wave (address data) for performing the M modulation is generated, and the modulated wave is used to modulate the address data generated in a channel subsequent to the channel and accessing the waveform / program ROM 100. The points are different. And the configuration is
Since the tone generator of the first embodiment is only partially different from the tone generator of the first embodiment, the tone generator of the present embodiment is similar to the tone generator 1 of FIG. , And a sound source section 20 ′ of FIG. 8 is used in place of the sound source section 20 of FIG. 1). Therefore, in FIG. 8, the same reference numerals are given to the components corresponding to those in FIG. 1, and the description thereof will be omitted.

FIG. 8 is a block diagram showing the configuration of the tone generator 20 'of the tone generator according to the present embodiment.

In the figure, a tone generator 20 'is supplied with a waveform calculator 21', an address generator 24 for generating real-valued address data, and an integer part of the address data generated by the address generator 24. A sine wave generator 25 for generating a sine wave in accordance with the value of the integer part, and waveform data read from the waveform / program ROM 100 and sine wave data generated by the sine wave generator 25 are supplied. It mainly comprises a selector 26 for selecting and outputting any of the data according to the value set in the register 23a.

The sound source section 20 'is different from the sound source section 20 of FIG. 2 only in that the frequency component control section 21b is omitted and the output register 21a1 of the waveform interpolation section 21a is omitted. The output from the volume change control unit 21c is supplied to the addition control unit 21e and fed back to the address generator 24. The output from the selector 26 is supplied to the waveform interpolation unit 21a 'together with the decimal part of the address data. Is done.

Thus, the waveform / program ROM
Channel that does not access 100 (even channel)
In the above, a sine wave is generated by a sine wave generator 25 based on the integer part of the address data generated from the address generator 24, and the sine wave is supplied to the waveform interpolation unit 21a 'via the selector 26. Then, the envelope is given from the envelope generator 21 d by the volume change control unit 21 c and fed back to the address generator 24. Then, the feedback value is added to the address data generated by the address generator 24 to generate the address data of the waveform / program ROM 100, that is, the FM-modulated address data. Here, each of the even-numbered channels is associated with one of the odd-numbered channels. In the present embodiment, it is possible to modulate the address data of the corresponding odd-numbered channel with the feedback value generated in the even-numbered channel, and apply FM modulation to the waveform data generated in the odd-numbered channel. As a result, in the 16-note simultaneous sound generation mode, although the number of sounds is reduced, the generated waveform data of each channel has 32
It is possible to add timbre control by a method different from the simultaneous sound generation mode.

FIG. 9 is a flowchart showing the procedure of the note-on event process when the 16-note simultaneous sound generation mode is set as the sound source mode (sound source mode = 1).

In the figure, first, the note number NN and velocity VEL of the note-on event are set to R
Take it into the work area of AM40 (step S4
1).

Next, 16 channels (odd channels)
A search is made for an empty channel among the sounding channels of, and tone generation is assigned to that channel (step S42). The same tone control data as in step S23 is set in the register of the channel to which the sound is assigned, and the corresponding tone control data is set. A predetermined part of the tone control data among all tone control data is set in the modulator channel (step S43).

Then, note-on is transmitted to the assigned channel and the modulator channel to generate a tone signal (step S44), and thereafter, the present note-on event process is terminated.

As described above, in the above-described first and second embodiments, two types of sound source modes, ie, a 32-tone simultaneous sounding mode and a 16-tone simultaneous sounding mode, are provided, and under a situation where the load on the CPU 30 is normal or lighter. While the 32-tone simultaneous sound generation mode is selected and determined as the sound source mode, the CPU 3
In a situation where the load on 0 is heavier than usual, the 16-note simultaneous sounding mode is selected and determined as the sound source mode, and the frequency at which the sound source unit 20 can access the waveform / program ROM 100 is limited. Since the frequency with which the ROM 100 can be accessed is increased, there is no delay in the control process of the CPU 30 for the sound source section 20, and a high-response musical tone can be generated. When the 16-note simultaneous sound generation mode is selected, the CP for the sound generation assignment process is selected.
Since the load on the U30 is reduced to half of that when the 32-tone simultaneous sound generation mode is selected, the load on the CPU 30 can be further reduced.

In both embodiments, two types of sound source modes, ie, a 32-tone simultaneous sounding mode and a 16-tone simultaneous sounding mode, are provided. May be replaced by 24 tones, or another number of simultaneous tones. Further, the number of sound source modes need not be limited to two, but may be three or more.

In both embodiments, the method of assigning sounds by comparing the volume envelopes has been shown (steps S22, S32, S42), but the sound assignment by other methods such as last-come first-served or first-come first-served is adopted. May be. Even in such a case, the situation in which the load of the allocation process increases rapidly as the number of sounding channels increases is the same, and the present invention can be effectively used.

[0067]

As described above, according to the present invention,
According to the control mode designated by the control mode designating means, the number of channels for generating musical tone waveforms is switched by reading waveform data from the waveform / program memory, and the arithmetic control processing unit Since the time ratio between the time for reading the control program and the time for the waveform memory sound source to read the waveform data from the waveform / program memory can be switched, the processing speed of the arithmetic control processing unit can be reduced irrespective of the operation processing state in the musical tone generator. As a result, it is possible to generate a musical tone with high response.

Preferably, the channel from which reading of the waveform / program memory is not performed due to the switching is performed with respect to a tone waveform generated by reading waveform data from the waveform / program memory in a channel other than the channel. Since it is used for adding a new tone color control, the tone quality of each channel when the number of channels is reduced can be higher than the tone quality when the number of channels is large.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a musical sound generating device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a detailed configuration of a waveform calculation unit in FIG. 1;

FIG. 3 is a diagram showing an example of an access timing to the waveform / program ROM of FIG. 1;

FIG. 4 is a flowchart showing a procedure of a main program executed by the musical sound generating device of FIG. 1, in particular, a CPU;

FIG. 5 is a flowchart showing a procedure of an operation mode setting operator process that occurs when a user operates the operation mode setting operator of the panel display & panel operator of FIG. 1;

FIG. 6 is a flowchart illustrating a procedure of note-on event processing when a 32-tone simultaneous sound generation mode is set as a sound source mode.

FIG. 7 is a flowchart illustrating a procedure of a note-on event process when a 16-note simultaneous sound generation mode is set as a sound source mode.

FIG. 8 is a block diagram showing a configuration of a sound source unit of a musical sound generating device according to a second embodiment of the present invention.

FIG. 9 is a flowchart illustrating a procedure of note-on event processing when a 16-note simultaneous sound generation mode is set as a sound source mode in the tone generator according to the second embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 10 access management unit (control unit) 20 sound source unit (waveform sound source unit) 23a mode register (control mode specifying unit) 30 CPU (calculation control processing unit, control mode specifying unit) 100 waveform / program ROM (waveform / program memory)

Claims (2)

[Claims] 1. A waveform memory tone generator for generating a musical tone waveform of a plurality of channels based on waveform data read from a waveform / program memory for storing waveform data and a control program, and a waveform memory read from the waveform / program memory. An arithmetic control processing unit that performs arithmetic control based on the control program, wherein the waveform / program memory is shared by the waveform memory sound source unit and the arithmetic control processing unit, wherein the arithmetic control processing unit Control mode designating means for designating any one of a plurality of control modes indicating a plurality of control contents to be executed; and reading out waveform data from the waveform / program memory according to the designated control mode. By switching the number of channels for generating musical tone waveforms, Control means for controlling so as to switch a time ratio between a time when the control processing unit reads the control program from the waveform / program memory and a time when the waveform memory sound source unit reads the waveform data from the waveform / program memory. Characteristic musical sound generator. 2. The channel from which reading of the waveform / program memory is not performed due to the switching,
2. A tone generator according to claim 1, wherein the tone generator is used to add new tone color control to a tone waveform generated by reading waveform data from the waveform / program memory in a channel other than the channel. apparatus.