JP2876984B2 - Sound source device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound source device having a plurality of sounding channels, and more particularly, to a case where a plurality of sounding channels are simultaneously operated to form one musical tone, and the operation of each sounding channel is started simultaneously. The present invention relates to a sound source device with improved performance.

[0002]

2. Description of the Related Art In a so-called multi-channel tone generator having a plurality of tone generation channels, when a certain tone generation channel is instructed to generate signal data of tone data or modulation data (eg, an operator in an FM tone generator), a CP is required.
When a control unit such as U sets sounding instruction data to instruct sounding start in a register corresponding to the sounding channel, a circuit of the sound source device reads the data and starts forming signal data. I was

In the case where signal data is simultaneously formed in a plurality of tone generation channels, tone generation instruction data is set in registers corresponding to the plurality of tone generation channels, so that the plurality of tone generation channels synthesize signal data. Start.

[0004]

However, since the control unit such as the CPU operates sequentially, it is impossible to set the tone generation instruction data in the registers of a plurality of tone generation channels at the same time. Also, in order to start the formation of signal data in the sounding channel, much data other than the sounding instruction data must be set in the register of the sounding channel, so this data set is performed for each sounding channel. Instructing the start of sounding for a plurality of channels has a disadvantage that a large difference occurs in the sounding start timing between the first channel for which sounding is instructed and the last channel for which sounding is instructed.

[0005] This shift is not so problematic when each tone generation channel forms separate tone data, but the signal data formed by one tone generation channel is frequency-modulated by the signal data formed by another tone generation channel. For example, in the case of the FM sound source system in which a plurality of sounding channels are combined by a predetermined algorithm to form musical sound data, there is a possibility that a difference occurs in the waveform of the musical sound data to be formed, which affects the tone color.

In a conventional tone generator, a plurality of tone generation channels are connected to one register in a hardware manner.
When data is set in this register, a plurality of sounding channels start sounding simultaneously. In such a sound source device, however, the algorithm is fixed in hardware, and the sound source device has a high degree of freedom. In some cases, the pronunciation channel could not be used effectively.

An object of the present invention is to provide a tone generator capable of simultaneously generating / erasing signal data in a plurality of tone generation channels and having no restriction on the algorithm configuration.

[0008]

According to the present invention, there is provided a tone generation control data storage means for storing tone generation control data corresponding to a plurality of tone generation channels, and a plurality of tone generation channels for generating or deleting signal data based on the tone generation control data. An operation instruction data storage area for storing operation instruction data for instructing generation or erasure of signal data, and instructing execution of generation or erasure of signal data to each of the plurality of tone generation control data storage means. An execution instruction data storage area for storing execution instruction data, wherein the plurality of sound channels have operation instruction data stored in their own sound control data storage means, and any of the plurality of sound control data storage means. Means for generating or erasing signal data when execution instruction data is stored Characterized by providing.

The present invention also provides a tone generation control data storage means for storing tone generation control data corresponding to a plurality of tone generation channels, a plurality of tone generation channels for generating or deleting signal data based on the tone generation control data, and Each of the tone generation control data storage means includes an operation instruction data storage area for storing operation instruction data for instructing generation or erasure of signal data, and further performs generation or erasure of signal data in common for each tone generation channel. An execution instruction data storage area for storing instruction execution instruction data to be instructed is provided, operation instruction data is stored in its own sound generation control data storage means in the plurality of sound generation channels, and execution is performed in the execution instruction data storage area. Means for executing operation of generating or erasing signal data when instruction data is stored Characterized by providing.

Further, according to the present invention, by connecting one sounding channel to another sounding channel and inputting the one generated signal data to the other sounding channel, a signal generated by the other sounding channel is obtained. The tone data is formed by modulating data.

[0011]

The sounding channel generates signal data based on sounding control data stored in the sounding control data storage means. The sound control data includes, for example, data specifying a signal frequency and a waveform. The signal data is, for example, musical sound data or an operator of an FM sound source. Further, an operation instruction data storage area and an execution instruction data storage area are provided in the sounding control data storage means. The operation instruction data is data for instructing generation or erasure of signal data set by the contents stored in the sounding control data storage area. However, this data does not indicate that the operation is to be started. The execution instruction data is data for instructing execution of signal data generation / stop operations for all tone generation channels in which the operation instruction data is stored, and this data is stored in any of the control data storage units. At this time, the sounding channel in which the operation instruction data is stored starts its operation.

Thus, necessary tone generation control data and operation instruction data are written in the tone generation control data storage means of the tone generation channel to be simultaneously emitted, and finally, the execution instruction data is written in one of the tone generation control data storage areas. At this time, the operation starts simultaneously in all the sounding channels, and the simultaneous operation can be realized.

It is also possible to provide one execution instruction data storage area independently without storing the execution instruction data in the tone generation control data storage means. In this case, the storage area of the tone generation control data storage means can be effectively used. Further, when tone data is formed by forming a so-called FM tone generator using the tone generation channels of the tone generator, each operator is simultaneously formed, and the waveform of the tone data formed by these operators is affected by a shift in tone generation timing. Disappears.

[0014]

FIG. 1 is a block diagram of a video game machine to which a sound source LSI according to an embodiment of the present invention is applied. A display 4 and a speaker 5 are connected to the game console 1. As the display 4 and the speaker 5, those built in the television receiver can be used. In addition to the display 4 and the speaker 5, the game machine body 1 is connected with a game cartridge 3 having a built-in ROM 19 storing a game program, and a controller 2 operated by a player to play a game. The controller 2 is connected to the game machine body 1 via a cable, and the game cartridge 3 is connected to the game machine body 1
Is inserted into the slot provided in the. The game machine main body 1 has a built-in CPU 10, which controls operations of the entire apparatus such as progress of a game. The CPU 10 includes the controller 2 and the R in the game cartridge 3.
OM19, display controller 1 for display control
4 and a sound source LSI 11 for generating sound effects and BGM. The tone generator LSI 11 is connected to a DRAM 13 for storing waveform data and the like, and a D / A conversion circuit 16 for converting generated tone data into analog tone signals. The speaker 5 is connected to the D / A conversion circuit 16. The display controller 14
Are connected to a VRAM 15 for storing screen display data and the display 4.

When the game cartridge 3 is set in the game machine main body 1 and the power is turned on, the CPU 10 first reads predetermined screen data and sends the screen data to the display controller 14, and also generates waveform data for generating sound effects and BGM. Is written to the DRAM 13. Thereafter, the game is started by the operation of the controller 2, and the CPU 10 rewrites screen data, emits sound effects, and sounds BGM as the game progresses.

FIG. 2 is a diagram showing the internal configuration of the sound source LSI 11. As shown in FIG. As shown, the sound source LSI 11 includes a phase generator 30, an adder 31, an address pointer 32, an interpolator 33, a multiplier 34, a low frequency oscillator for amplitude modulation (ALF).
O) 35, an envelope generator (EG) 36, an output mixing circuit (MIX) 37, a read / write controller 38, an internal RAM 39, an averaging circuit 40, and a coefficient multiplier 41. The tone generator LSI 11 can form musical tone data in two types, that is, a waveform memory type and an FM tone source type. The above-described circuit operates as described below to operate low-frequency signals such as musical tone data and modulation data. Generate data. The sound source LSI 11 has 32 time-division channels, and can simultaneously generate 32 signal data.

The tone generator LSI 11 has an internal register 19. As shown in FIG. 3, a plurality of storage areas corresponding to each tone generation channel are set in the internal register 19. Data is set in these storage areas when the CPU 10 instructs a sounding channel corresponding to a predetermined timing to sound or mute. The phase generator 30 determines a predetermined sampling period (for example, 44.1 kHz) based on the FNS data and the octave data OCT corresponding to the pitch name set in the internal register 19.
z) Generate phase data every time. This phase data is input to the adder 31. Modulation data can be input to the adder 31 from the coefficient multiplier 41 by setting.
When the modulation data is input from the coefficient multiplier 41, the adder 31 adds the modulation data to the phase data and outputs the result to the address pointer 32. The modulation data is, for example, low frequency signal data of a sine wave, and the phase data is modulated by the modulation data, and the address value output from the address pointer 32 is shifted back and forth, so that the waveform of the read signal data is frequency modulated. Will be done.

The address pointer 32 reads a start address SA, a loop start address LSA, and a loop end address LEA from the internal register 19 as data specifying the waveform data stored in the DRAM 13. When reading this waveform data for a long time, the loop start address LSA and the loop end address LEA
This is an address indicating a section that is repeatedly read. The address pointer 32 determines the increment of the address based on the phase data input from the adder 31, and outputs address data including a decimal part. Decimal part data FRA of the address data is output to the interpolator 33, and two integer addresses MEA sandwiching the decimal part are output to the DRAM 13.

Two adjacent waveform data are read from the DRAM 13 by the two input integer addresses MEA. The waveform data read from the DRAM 13 is input to the interpolator 33. The interpolator 33 forms signal data at the sampling timing by interpolating the two input waveform data in accordance with the value of the decimal part data FRA input from the address pointer 32.
The interpolator 33 inputs this data to the multiplier 34.

The multiplier 34 includes an amplitude modulation low frequency oscillator (ALFO) 35 and an envelope generator (E
G) 36 is connected. The ALFO 35 reads frequency data LFOF, waveform designation data LFOWS, and influence data (amplitude data) LFO read from the internal register 19.
Based on S, modulated signal data having a low frequency waveform as shown in FIG. 5 is generated. The EG 36 reads the attack rate AR, the first decay rate D1R, the second decay rate D2R, and the release rate RR from the internal register 19, and generates envelope waveform data as shown in FIG.

The multiplier 34 multiplies the signal data formed by the interpolator 33 by the above-mentioned modulated signal data and / or envelope waveform data, and then outputs the result by an output mixing circuit 37.
And outputs it to the read / write controller 38. The output mixing circuit 37 mixes the input signal data as musical sound data into left and right two channels, and
Output to the A conversion circuit 16.

When music data is formed by the waveform memory method, waveform data which can be used as tone data as it is, such as sampling data, is stored in the DRAM 1.
3 to form signal data. The multiplier 34 adds an envelope to the signal data and outputs it to the output mixing circuit 37. Therefore, the read / write controller 3
The signal data (stored in the internal RAM 39) input to 8 is not used.

On the other hand, an internal RAM 39 is connected to the read / write controller 38, and the signal data (operator) input from the multiplier 34 is stored in the internal RAM 3.
9 is written in a predetermined area. Internal RAM 39 is 32
The read / write controller 38 has a 64-word storage area capable of storing channel signal data for two sampling timings (two generations).
4 is written into a predetermined area of the internal RAM 39, and one or two predetermined signal data (designated by an algorithm) are read out at a time-division timing of a predetermined sounding channel to obtain an averaging circuit 40. To enter. Which data is read at each time-division timing is specified by one or two modulation data specifying data MDXSL and MDYSL stored in a register (see FIG. 3) of each sounding channel.
The designation of L and MDYSL is an algorithm designation when forming musical sound data by the FM tone generator method. That is, this M
An algorithm as shown in FIG. 4 is configured by associating the sound data of a plurality of sound channels with DXSL and MDYSL. When two data are read from the read / write controller 38, the averaging circuit 30 calculates an average value of these data. This averaging operation may be any operation such as arithmetic averaging, geometric averaging, or a weighted average thereof. Averaging circuit 30
Is multiplied by the modulation factor data MDL (see FIG. 3) in the coefficient multiplier 31, and then input to the adder 31.

Here, in the case where the phase data (reading frequency) is sequentially modulated from the sounding channel 0 to the sounding channel 3 as shown in FIG.
Is temporarily stored in the internal RAM 39 and read /
The signal is returned to the adder 31 at the timing of the sound channel 1 via the light controller 38. This operation is similarly performed up to the tone generation channel 3, and the signal data of the tone generation channel 3 may be input to the output mixing circuit 37 as tone data. When the signal data of the sounding channels 0 and 1 are added and synthesized (or multiplied and synthesized) and the read frequency of the sounding channel 2 is modulated by the data as shown in FIG.
The data of the sounding channel 1 may be stored together in the internal RAM 39, read out at the time division timing of the sounding channel 2, and input to the averaging circuit 40. Further, as shown in FIG.
In the case of modulating its own readout frequency by feeding back the signal data formed by the tone generator 0, the signal data of the sounding channel 0 is temporarily stored in the internal RAM 39, and the adder 31 is added to the next or subsequent time-division timing of the sounding channel 0. Enter it in

As described above, when modulating the waveform reading frequency of a certain sounding channel, signal data serving as modulation data is stored in the internal RAM 39, and the sounding channel (time division) for reading out signal data serving as modulated data is stored. This is read out at the timing) and the address pointer 3
What is necessary is just to input into the adder 31 before two.

FIG. 3 is a block diagram of the internal register 19. Although FIG. 2 shows only the configuration of the register of the sounding channel 0, the other 31 sounding channels (sounding channel 1 to sounding channel 31) have exactly the same structure. A register area of 16 bits × 9 columns is allocated to one tone generation channel, and storage areas of various data shown in the description of FIG. 2 are allocated. Further, a sounding / muting bit KB and an execution bit KX are assigned to the eleventh and twelfth bits of the first column.

When instructing sounding channel 0 to sound, various data are written into the sounding channel 0 register and "1" is set in KB. In the case of sound generation of only this channel, "1" is also set to KX.
On the other hand, if there is a channel other than the sounding channel 0 to be sounded at the same time, "1" is set only in KB and K
X is not set, and data is written to registers of other channels. Finally, KX of the register in which the data is written is set. Each sounding channel starts sounding operation when it confirms that any KX is set. Therefore, by setting this KX, sounding channels in which data is set start sounding simultaneously (within one sampling timing). Will do.

That is, the tone generator LSI 11 determines whether or not KB has been set from the register of the sounding channel at the operation timing of each sounding channel, and whether or not KX of the registers of all other sounding channels has been determined. It is configured to determine whether or not. Thus, in each sounding channel, when its own KB is set, and when KX of any sounding channel including itself is set, the sounding operation is started as the sounding timing. At the same time, the KB of its own sounding channel is reset to "0". If the own KX is set, the KX is reset to the next own time division timing. This makes one KX
The operation of all sounding channels for which KB has been set at that time can be started within the time division timing of one sampling cycle, and does not affect the operation of the sounding channels thereafter.

In the above description, only the operation at the start of sound generation has been described. That is, when KB is set for a sounding channel that is sounding, the sounding channel is muted by using KX immediately after that as a trigger.

In the above embodiment, KX is provided in the register of each tone generation channel. However, a KX bit register may be provided in an area other than these registers. In this case, each register has a margin of 1 bit, but the CPU 10 needs to perform the operation of setting KX separately from the operation of setting the data for each tone generation channel.

[0031]

As described above, according to the present invention, it is confirmed that the execution instruction data is stored, and all the tone generation channels simultaneously generate / delete the signal data. Even when the generation / deletion of the signal data is instructed to the tone generation channels of these, it is possible to cause these tone generation channels to simultaneously generate / delete the signal data. In particular, when forming musical sound data by the FM sound source method,
There is an advantage that the waveform does not fluctuate due to a shift in the formation timing of each signal data.

Further, by writing the execution instruction data,
Since all the sound channels to which the operation instruction data has been written start operating at the same time, it is not necessary to group the sound channels in advance, and by writing the operation instruction data to the sound channels to be operated simultaneously at that time. A plurality of sound channels can be simultaneously operated in any combination.

[Brief description of the drawings]

FIG. 1 is a block diagram of a game apparatus using a sound source LSI according to an embodiment of the present invention.

FIG. 2 is a block diagram of the sound source LSI.

FIG. 3 is a diagram showing a configuration of an internal register of the sound source LSI.

FIG. 4 is a diagram showing an example of a tone signal forming algorithm used in the sound source LSI.

FIG. 5: ALF formed by a sound source LSI and built-in ALF
The figure which shows the example of the low frequency waveform which FO forms

FIG. 6 is a diagram showing an example of an envelope waveform formed by an envelope generator included in the sound source LSI.

Claims (3)

(57) [Claims] 1. A sound generation control data storage means for storing sound generation control data corresponding to a plurality of sound generation channels; a plurality of sound generation channels for generating or deleting signal data based on the sound generation control data; An operation instruction data storage area for storing operation instruction data for instructing generation or erasure of signal data in each of the data storage means, and execution instruction data for storing execution instruction data for instructing execution of generation or erasure of signal data A storage area, wherein the plurality of sound channels have operation instruction data stored in their own sound control data storage means, and execution instruction data is stored in any of the plurality of sound control data storage means. Means for generating or erasing signal data when the Place. 2. A sound generation control data storage means for storing sound generation control data corresponding to a plurality of sound generation channels; a plurality of sound generation channels for generating or deleting signal data based on the sound generation control data; Each of the data storage means includes an operation instruction data storage area for storing operation instruction data for instructing generation or erasure of signal data, and further, execution for instructing generation or erasure of signal data in common for each tone generation channel. An execution instruction data storage area for storing instruction data is provided, operation instruction data is stored in its own sounding control data storage means in the plurality of sounding channels, and execution instruction data is stored in the execution instruction data storage area. Means for performing an operation of generating or erasing signal data when stored. Characteristic sound source device. 3. The plurality of sounding channels, wherein one sounding channel is connected to another sounding channel,
3. The tone generator according to claim 1, wherein the signal data generated by the other sounding channel is modulated by inputting the one generated signal data to the other sounding channel to form musical sound data. .