JP3376901B2 - Channel accumulator for sound source that performs time division channel operation - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-division channel operation source for accumulating tone input data of a plurality of time-division channels arranged so as to divide a sampling period into substantially equal parts and external input data. Regarding the channel accumulator.

[0002]

2. Description of the Related Art In a conventional sound source which operates in a time division channel, waveform data of a plurality of time division channels arranged so as to equally divide a sampling period is multiplied by envelope data and level control data for each time division channel. By doing so, the level control is performed, and the waveform data of the plurality of time-division channels for which the level control is performed is accumulated in the channel to generate the waveform data for each sampling period. In this case, one time division channel becomes one sound generation channel. There is a case where it is desired to input music data from a microphone input or another sound source in the sound source, and such a sound source performing time-division channel operation capable of inputting data from the outside has been proposed.

[0003]

However, in order to channel-accumulate the external input data to the musical tone data inside the sound source, an adder for adding the external input data and the musical tone data inside the sound source is required. There was a problem that an adder had to be provided. It is also conceivable to perform channel accumulation of external input data without newly providing an adder by allocating one of the time-division channels to external input data.
In this method, the number of sound generation channels is reduced by one, which causes a problem that various playing modes may be hindered.

Therefore, according to the present invention, it is not necessary to additionally provide an adder even if the external input data is accumulated in the channel, and the channel accumulation of the sound source is performed in the time-division channel operation without decreasing the tone generation channel. The purpose is to provide a vessel.

[0005]

In order to achieve the above object, a channel accumulator of a sound source which operates in a time division channel according to the present invention has a plurality of times arranged so as to divide one sampling period into substantially equal divisions. The addition means having a first addition input to which the waveform data of the divided channels are sequentially input and a second addition input to which the output of the selection means is input, and the addition output output from the addition means are A delay means for delaying by a time corresponding to the divided channels; a selecting means for selecting one of the delay output output from the delay means and the external input data and inputting it to the second addition input of the adding means. At the timing when the waveform data of the first time division channel, which is the first time division channel in one sampling period, is input to the first addition input of the addition means. When the selecting means selects the external input data, the adding means adds the external input data and the waveform data of the first time division channel to the first adding input of the adding means. from the timing at which the waveform data of the second time-division channel is input to one sampling period is completed, the selected manual
The stage selects the delayed output output from the delay means and inputs it to the second addition input of the addition means,
Channel accumulation of the external input data and the waveform data of all time-division channels is performed.

Further, another channel accumulator of a sound source which performs time-division channel operation of the present invention which can achieve the above object is arranged so as to divide one sampling period into substantially equal parts, and each time-division. N (n =
, 1, 2, 3, 4, ...) Waveform data of a plurality of time division channels composed of waveform data of a plurality of time division channels are sequentially input, and an output of the selecting means is input. Adder having two addition inputs, an n-stage delay means for delaying the addition output output from the adder by a time corresponding to the one time-division channel, and a time division output from the n-stage delay means One sampling cycle, which comprises either a selected delay output consisting of n systems or time-divided n input external data consisting of n systems and inputting it to the second addition input of the addition means. At the timing at which the waveform data of the first time division channel which is the first time division channel in the above is input to the first addition input of the addition means, the selection means selects the external input data. By the the addition of each system and the external input data and the first time-division channel of the waveform data in the adding means it is performed, the first of the adding means
From the timing at which the waveform data of the second time-division channel is input to the addition input to one sampling period ends, the second of said adding means selects the delayed output of the selection means is output from said n-stage delay means By inputting to the addition input, channel accumulation of the external input data and the waveform data of all time division channels is performed for each system.

Further, in the channel accumulator of the sound source which operates in the time division channel, the external input data stored in the delay means or the n-stage delay means at the timing when one sampling period is completed.
Data channel and waveform data of all time-division channels
Accumulated value, or the external input data and all time division
Channel waveform data and channel accumulated value waveform data for each system , further comprising arithmetic processing means having a multiplier for performing mixing and effect processing in the waveform data, at the timing when the multiplier is idle, The external input data and the level control signal may be multiplied by the multiplier, and the level-controlled external input data output from the multiplier may be input to the selecting unit via a first-in first-out unit.

According to the present invention, when the waveform data of the first time division channel which is the first time division channel in one sampling period is input to the first addition input of the addition means, the second addition input By selecting and inputting external input data as, the external input data and the first time division channel are added. Next, when the waveform data of the second time division channel is input to the first addition input of the addition means, the output of the delay means is input as the second addition input, whereby the external input data and the first time division channel are input. The waveform data of the second time division channel is added to the waveform data obtained by adding the waveform data of the above. Furthermore, when the waveform data of the time division channels after the third time division channel are input to the first addition input of the addition means, the same processing as the processing of the second time division channel is performed, so that one sampling cycle When the processing is completed, the external input data and the waveform data of all the time-division channels can be channel-accumulated to obtain waveform data. Therefore, the present invention provides a channel accumulator of a sound source which does not require a new adding means when accumulating channels of external input data and which operates in a time-division channel mode without reducing the number of sound generation channels. be able to.

[0009]

FIG. 1 is a block diagram showing an example of the configuration of an embodiment of a time-division channel operation sound source provided with a channel accumulator according to the present invention. In FIG. 1, reference numeral 1 is a central processing unit (CPU) or RO.
M (Read Only Memory), RAM (Random Access Memo)
ry), a one-chip microcomputer that controls the entire sound source,
Reference numeral 2 is a tone generator register that stores tone control data for controlling the tone generated in each time-division channel, tone generator control data, mixer control data for controlling the DSP 20, and DSP control data. Also, 3 is the MID
A MIDI input section for receiving a MIDI signal from the I device,
Reference numeral 4 denotes a panel display for displaying information on various sound sources, and reference numeral 5 denotes a panel operator for giving various instructions to the sound sources.

Reference numeral 11 further divides the waveform data of each time-divided sound channel of 32 channels into 1 DAC cycle, which is a sampling period, based on the frequency number parameters and tone color parameters stored in the tone generator register 2. 32ch time-sharing OS that sequentially occurs according to time-division channel timing
C and 12 sequentially generate the envelope data of each channel in the 32 time-divided tone generation channels based on the envelope parameter of the tone generation channel in the tone generator register 2 according to the time division channel timing obtained by equally dividing 1 DAC cycle. 32c
It is h time division EG. Furthermore, 13 is a multiplier for multiplying the waveform data of each time division channel output from the 32 ch time division OSC 11 by the level-controlled envelope data of each time division channel output from the 32 ch time division EG 12, and 14 is a 32 ch It is a synthesizing unit for synthesizing the level control data for level-controlling the envelope data of each time division channel output from the time division EG 12. Here, the combination executed by the combining unit is to add when the envelope data and the level control data to be described later have a decibel scale, and to multiply when the data has a linear scale.

The waveform data in the one-time-division channel is composed of four types of systems (dry, reverb, chorus, and variation) which are stereo and perform different types of effect processing. That is, the waveform data of the 1 time-division channel is controlled by the level control data of 8 systems, and the level control data of the 8 time-division channels are respectively allocated to the time slots obtained by equally dividing the 1 time-division channel into eight. Has been. Also, 3
Time-divided 32 channels of waveform data are sequentially generated from the 2ch time-division OSC 11 for each time-division channel, and time-division 32 channels of envelope data are sequentially generated from the 32ch time-division EG12. It is generated for each channel. Then, from the level control data generator 2-1 in the sound source register 2 which supplies the level control data to the synthesizer 14, eight channels of time-divided level control data for 32 channels are sequentially generated for each time slot. It

Returning to the explanation of FIG. 1, reference numeral 15 denotes the waveform data in each of the eight time-division channels multiplied by the level-controlled envelope data from the multiplier 13 input to the addition input A, and the addition input B. The input selection unit 18
The adder for accumulating the channels by adding the data of the eight systems selected in step 16 stores the waveform data of eight channels of the one-time-division channel of the channels accumulated from the adder 15. An eight-stage delay unit composed of eight unit delay stages, 17 an eight-stage register that stores waveform data for eight time-division channels output from the eight-stage delay unit 16, and eighteen 8-stage delay unit 16
And the output from the 8-stage FIFO 19 and selects the input to the addition input B of the adder 15, and 19 is the level-controlled external input unit 21 It is an 8-stage FIFO (First-In First-Out) having a first-in first-out function for storing external input data.

Further, 20 is 8 in which all time-division channels read from the 8-stage register 17 are accumulated.
This is a DSP which outputs stereo tone data obtained by performing arbitrary mixing by adding reverb, chorus, and variation effects to system waveform data every DAC cycle. The DSP 20 multiplies the external input data input from the external input unit 21 such as a microphone by the eight level control data generated from the level control data generating unit 2-2 in the tone generator register 2, respectively. It has a multiplication means 20-1 for outputting external input data of eight systems. Furthermore, 22L and 22R are DACs (Digital Analog) for converting each stereo sound data of L channel and R channel output from the DSP 20 every DAC cycle into an analog sound signal.
Converter), 23L and 23R are DAC22L and DAC
This is a sound system for stereophonically outputting each of the L-channel and R-channel analog tone signals output from the 22R.

Next, the operation of the channel accumulator of the present invention in the sound source shown in FIG. 1 will be described with reference to the timing chart shown in FIG. When a MIDI event is received from the MIDI input unit 3, the 1-chip microcomputer 1
Executes sound source driver processing and sends sound source parameters to the sound source register 2. If a note-on event is input at this time, the 1-chip microcomputer 1 first generates a new musical sound based on the note-on event.
A tone generation channel is assigned, and tone source parameters such as note number, tone color information, velocity, envelope parameter, modulation parameter, and eight levels of level control data are set in the channel region assigned by the tone generator register 2.
When a note-off event is input, an envelope parameter or the like that can stop sound generation based on the note-off event is set in the tone generator register 2.

The 32ch time-division OSC 11 executes a tone generation process at each time-division channel timing. In this tone generation process, waveform data for 32 channels is generated according to the tone generator parameters of the tone generation channels set in the tone generator register 2 according to the time division channel timing obtained by dividing 1 DAC cycle (1 sampling period) into 32 equal parts. . The arrangement of the 32 time-division channels is the same as the arrangement shown in the EG multiplication output column of FIG. That is, the start timing of one DAC cycle is time t0, and each time-division channel timing obtained by dividing one DAC cycle into 32 equals time t.
1, t2, t3, ...
The waveform data of the first time division channel is generated and output from 0 to time t1, the waveform data of the second time division channel is generated and output from time t1 to time t2, and so on. Waveform data of the 3rd time-division channel to the 31st time-division channel is generated and output, and waveform data of the 32nd time-division channel is output from time t31 which is the last time-division channel timing to time t0 of the next DAC cycle. Generated and output.

The structure of each time division channel is, as illustrated in the 16th time division channel starting from time t15, eight time division time slots TS1 and TS1.
2, TS3, ..., TS8, and each time slot is assigned level control data of 8 systems × 32 channels. That is, the level control data of the first system in the channel is allocated to the time slot TS1 of each time division channel, and the time slot TS2
To the time slot TS3 to the time slot TS8 in the same manner.
Level control data of the system to the eighth system is assigned. Therefore, the number of level control data for 8 time-divided 32 time-division channels is 8 × 32 = 25.
The number is 6, which means that 32 time-division channels consisting of 8 systems time-divided into 1 DAC cycle are arranged in order.

In addition, 1 in 32ch time division EG12
Envelope data for 32 channels is generated in accordance with the envelope parameter of each tone generation channel set in the tone generator register 2 in accordance with the time division channel timing obtained by dividing the DAC cycle into 32 equal parts. This 32
The envelope data for the channels is combined in the synthesizer 14 by the level control data generator 2-1 in the tone generator register 2.
And 8 levels × 32 channels of level control data generated from the above are sequentially combined. As a result, the envelope data for 32 channels is level-controlled, but each level control data can be set to an arbitrary value. The arrangement mode of the time-division channels of the level-controlled envelope data of 8 channels × 32 channels output from the synthesizing unit 14 is similar to the arrangement mode shown in the EG multiplication output column of FIG.

Then, in the multiplier 13, the waveform data of 32 channels generated from the 32ch time division OSC 11 is generated from the 32ch time division EG 12 and the level is controlled in the synthesizing section 14 by 8 systems × 3.
Envelope data for two channels are associated with each other and multiplied, and 32 time-division channels to which envelopes are added are sequentially output from the multiplier 13. The arrangement form of the 32 time-division channels is the arrangement form shown in the column of the EG multiplication output shown in FIG. 2, and the waveform data of each of the 8 channels in the 32 time-division channels is added to the addition input A of the adder 15 in order. Entered in.

On the other hand, the data selected by the selector 18 is input to the addition input B of the adder 15, but from the time t0 to the time t1 shown in FIG. External input data VO is selected,
From the time point t1 to the time point when the 1 DAC cycle ends (start time point of the next 1 DAC cycle) t0, the delay outputs DL1 and DL1 composed of the waveform data for one time division channel output from the 8-stage delay unit 16
2, ..., DL31 are selected. That is, as shown in the column of 8-stage FIFO output and the column of 8-stage delay output shown as the B input in FIG. 2, the output is selected at the timing without hatching, and each output is the same as the time division channel. In addition, it has eight time slots which are respectively assigned to the waveform data of eight systems.

As a result, at the time t0 in the adder 15,
Up to time t1, the waveform data of 8 systems of the first time division channel and the external input data of 8 systems read from the 8-stage FIFO 19 are added at each time slot timing, and the addition output of the 8 systems is performed. Is an 8-stage delay section 16
Will be sequentially stored in each stage. The external input data is data from a microphone or an external sound source input from the external input unit 21, and the multiplication unit 2 in the DSP 20.
0-1 is used for each of the eight systems output from the level control data generator 2-2 in the tone generator register 2 at the timing when the multiplier 20-1 is not used by the microprogram in the immediately preceding DAC cycle. It is multiplied by the level control data thus obtained and stored in the 8-stage FIFO 19. Here, the level control data generator 2-2 and the level control data generator 2-1 described above are registers for storing level control data, respectively, and each level control data is supplied at a timing when it is required. To do.

Next, the selection unit 18 makes 8 at time t1.
The delay output from the stage delay unit 16 is selected. Then, from time t1 to time t2, waveform data of eight systems of the second time division channel output from the multiplier 13,
Eight-system waveform data for one time-division channel sequentially output from the eight-stage delay unit 16 is added at each time slot timing, and the eight-system added output is stored in each stage of the eight-stage delay unit 16. Become so. As a result,
The eight-stage delay unit 16 adds level-controlled external input data of eight systems, waveform data of eight systems of the first time division channel, and waveform data of eight systems of the second time division channel for each system. As a result, waveform data obtained by channel-accumulating the above three data is stored. Further, the selecting unit 18 selects the delay output from the eight-stage delay unit 16 at time t2. Then, from time t2 to time t3, the waveform data of eight systems of the third time division channel output from the multiplier 13 and the waveform data of eight systems of one time division channel output from the eight-stage delay unit 16 are obtained. Are added for each time slot timing, and the addition outputs of the eight systems are stored in each stage of the eight-stage delay unit 16. As a result, the 8-stage delay unit 16 receives level-controlled external input data of 8 systems, waveform data of 8 systems of the first time division channel, waveform data of 8 systems of the second time division channel, and third waveform data. The waveform data obtained by adding up the waveform data of eight systems of the time-division channel for each system and accumulating the four data channels is stored.

Such an addition operation is performed between time points t3 and t31, and at time point t1, the eight-stage delay section 16 receives level-controlled external input data of eight systems and the first time division. Waveform data obtained by channel accumulation of the 32 data, which is the result of adding the waveform data of 8 channels or the waveform data of 8 channels of the 31st time division channel for each channel, is stored. Then, the selecting unit 18 selects the delay output from the eight-stage delay unit 16 at time t31. Then, from time t31 to time t0 (start timing of the next DAC cycle), waveform data of eight systems of the 32nd time division channel output from the multiplier 13 and one time division output from the 8-stage delay unit 16 are output. The 8-system waveform data for the channels is added at each time slot timing, and the 8-system addition output is stored in each stage of the 8-stage delay unit 16. As a result, the 8-stage delay unit 1
Reference numeral 6 denotes level-controlled external input data of 8 systems, and waveform data of 8 systems of the first time division channel to 32nd.
The waveform data obtained by adding up the waveform data of the eight systems of the time division channel for each system and accumulating the data of the eight systems of 33 in the channel is stored. That is, 3
By repeating the addition operation twice, it is possible to perform channel accumulation of data of 33 8 systems without providing a new adder.

The musical tone data ADD obtained by channel-accumulating the data of the 8 channels of 33 is the 8-stage delay unit 1 between the start timing t0 of the next DAC cycle and the time t1.
The data is sequentially transferred to the 6th to 8th stage registers 17. This transfer mode is shown in the column of 8-stage register fetch in FIG. The transferred musical sound data ADD is made into musical sound data of 8 systems, and each system is stored in the 8-stage register 17 in a significant scale.
The musical tone data ADD of the eight systems are read from the eight-stage register 17 to the DSP 20 at a predetermined timing, and the reverb, chorus, and variation effects are added to each two systems, and the total six systems of musical tone data and the remaining dry data are added. Volume control is performed for two systems, and arbitrary mixing is performed with an 8-input 2-output multi-effect unit 20-
2 takes place. As a result, stereo sound data of the L channel and the R channel is output from the DSP 20 every DAC cycle.

The processing in this DSP 20 is performed by the DSP 2
The timing at which the multiplication unit 20-1 is not used during this processing is shown in the column of multiplier non-use timing in FIG. Eight times after the time point t1 of this multiplier non-use timing are used, and the external input data from the external input unit 21 and the level control data generating unit 2 in the tone generator register 2 are used.
It is multiplied by the level control data for each of the eight systems output from -2. Then, the result of this multiplication is the 8-stage FIFO.
By storing the data in 19, the external input data of eight systems whose levels are controlled in the next DAC cycle is accumulated.

Specifically, in each step of the DSP 20, it is determined whether or not the two inputs of the multiplier have selected valid values, and when neither of the two inputs has selected a valid value, the multiplier is When the information indicating the use / non-use of the multiplier is embedded as the unused timing or in the micro program to be executed by the DSP 20 and the information indicating the non-use of the multiplier is detected during the execution of the micro program. As the timing at which no multiplier is used, the external input data from the external input unit 21 and the level control data generating unit 2-2 in the tone generator register 2 described above are used.
It is only necessary to multiply the level control data for each of the eight systems output from the above by using the multiplier in the DSP 20. As a result, it is not necessary to add new hardware such as a multiplier, and the external input data from the external input unit 21 and the level control data in the tone generator register 2 are not affected without affecting the execution of the microprogram in the DSP 20. It is possible to multiply the level control data for each of the eight systems output from the generation unit 2-2.

In the above description, there are 32 time division channels.
Although the number of channels is set, the number of channels is not limited to this, and 16 channels, 64 channels, or any other number of channels may be used. Also, each time division channel has 8
Although the system is composed of the system (8 time slots), it is not limited to this and the system can be composed of any number of systems.
When the number of systems is n, 8-stage delay units 16 and 8
The number of stages of the stage register and the number of stages of the 8-stage FIFO are n stages, respectively. Further, the multiplication unit 20-1 performs n times of multiplication, and the 8-input 2-output multi-effect unit 20-
In 2, the effect addition and the mixing are performed on the n input data.

[0027]

As described above, according to the present invention, when the waveform data of the first time division channel which is the first time division channel of the sampling period (DAC cycle) is input to the addition input A of the addition means, addition is performed. By selecting and inputting the external input data as the input B, the external input data and the first time division channel are added for each system. Next, when the waveform data of the second time division channel is input to the addition input A of the addition means, the output of the 8-stage delay unit is input as the addition input B, so that the external input data and the first time division channel are input. The waveform data of the second time-division channel is channel-accumulated in the tone data obtained by adding and for each system. Furthermore, the third
Even when the waveform data of the channels after the time division channel are input to the first addition input of the addition means, the same processing as the processing of the second time division channel is performed. It is possible to obtain waveform data in which input data and all time-division channels are added for each system. Therefore, the present invention does not require a new adding means when channel-accumulating external input data, and
It becomes possible to provide a channel accumulator of a sound source that operates in a time-divisional channel mode without reducing the number of sound channels.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example in an embodiment of a sound source that performs time-division channel operation provided with a channel accumulator of the present invention.

FIG. 2 is a diagram showing a timing chart for explaining the operation of the channel accumulator of the present invention.

[Explanation of symbols]

1 1-chip microcomputer, 2 sound source register, 3 MID
I input section, 4 panel display, 5 panel operator, 11
32ch time division OSC, 12 32ch time division EG,
13 multiplier, 14 combiner, 15 adder, 16 8
Stage delay unit, 178 8-stage register, 18 selection unit, 1
9 8-stage FIFO, 20 DSP, 21 external input section, 2
2L, 22R DAC, 23L, 23R sound system

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G10H 1/00-7/12

Claims (3)

(57) [Claims] 1. A first addition input to which waveform data of a plurality of time division channels arranged so as to divide one sampling period into substantially equal divisions are sequentially input, and a second addition input to which an output of a selection means is input. A delay unit for delaying an addition output output from the addition unit by a time corresponding to the one time division channel; a delay output output from the delay unit; and external input data. Selecting means for selecting one of them and inputting it to the second addition input of the adding means, wherein the waveform data of the first time division channel which is the first time division channel in one sampling period is the first addition time of the addition means. By the selection means selecting the external input data at the timing of input to the addition input,
In the adding means, the external input data and the waveform data of the first time division channel are added, and one sampling is performed from the timing when the waveform data of the second time division channel is input to the first addition input of the addition means. Until the cycle ends , the selecting means selects the delayed output output from the delay means and inputs the delayed output to the second addition input of the adding means, whereby the external input data and the waveform data of all time-division channels are obtained. A channel accumulator of a sound source which operates in a time-divisional channel, characterized in that the channel accumulation of is performed. 2. One sampling period is arranged so as to be substantially equally divided, and n (n = n) are time-divided respectively.
, 1, 2, 3, 4, ...) Waveform data of a plurality of time division channels composed of waveform data of a plurality of time division channels are sequentially input, and an output of the selecting means is input. Adder having two adder inputs, an n-stage delayer for delaying an adder output output from the adder by a time corresponding to the one time-division channel, and a time-division output from the n-stage delayer A sampling period for selecting one of the time-divided n-system delayed output and the time-divided n-system external input data, and inputting the selected one to the second addition input of the adding unit. At the timing at which the waveform data of the first time division channel which is the first time division channel is input to the first addition input of the addition means, the selection means selects the external input data. By Rukoto,
Timing at which the external input data and the waveform data of the first time division channel are added by the adding means for each system, and the waveform data of the second time division channel is input to the first addition input of the adding means. 1 to the sampling period is finished, by said selection means is inputted to the second adder input of said n-stage said adder select the delayed output which is output from the delay means, the external input data and the total time division A channel accumulator for a sound source that performs time-division channel operation, characterized in that channel accumulation is performed for each system with channel waveform data. 3. The external input data stored in the delay means or the n-stage delay means at the timing when one sampling period is completed and the all-time division check.
Channel accumulated value with channel waveform data, or
Is the waveform data of the external input data and all time-division channels.
A waveform data of a channel accumulated value for each system with the data, and further comprising an arithmetic processing means having a multiplier for performing mixing and effect processing on the waveform data, wherein the multiplication is performed at a timing when the multiplier is idle. The external input data and the level control signal are multiplied by a multiplier, and the level-controlled external input data output from the multiplier is input to the selecting means via a first-in first-out means. A channel accumulator of a sound source that performs time division channel operation according to claim 1 or 2.