JPH06110461A - Effect addition device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to be able to give a plurality of acoustic effects to each of a plurality of series of input waveform data at an arbitrary ratio. [Structure] Waveform data for n channels are respectively multiplied by mixing coefficients a ₁₁ , a ₁₂ , ..., A _1n and then mixed, and the resulting mixed signal is subjected to # 1 effector processing. To be executed. The effector process of # 2 is that the mixing coefficient a ₂₁ , a ₂₂ , ... Is applied to each of the waveform data of n channels.
., A _2n are multiplied and then mixed to obtain a mixed signal. In the same manner, the effector processing of #m is performed on each of the n channels of waveform data by the mixing coefficient a.
It is performed on the mixed signal obtained by mixing after _m1 , a _m2 , ..., A _mn are mixed. The output signals obtained by processing each of the effectors # 1 to #m are mixed with each other, and
It is output to the outside after being mixed with the original waveform data of n channels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an effect adding device for executing a plurality of effect adding processes for each of a plurality of series of input waveform data.

[0002]

2. Description of the Related Art Digital signal processor (DS
With the development of P), many effect adding devices have been developed for adding a complicated sound effect to waveform data such as a musical tone signal obtained from an electronic musical instrument or the like.

Here, electronic musical instruments and the like have a plurality of series (a plurality of channels) corresponding to a polyphonic performance form.
Many have a function of processing and outputting minute musical tone signals in parallel, but if different acoustic effects can be added to such plural series of musical tone signals, a complicated musical tone output can be obtained. Can be expected.

As a conventional example of a technique for imparting different acoustic effects to a plurality of series of musical tone signals, there is disclosed in Japanese Patent Laid-Open No.
There is one described in Japanese Unexamined Patent Publication No. 256198. In this conventional example, it is possible to give any one of a plurality of effects to each of a plurality of series of tone signals.

[0005]

However, in the above-mentioned conventional example, even if an arbitrary effect can be given to each of a plurality of series of musical tone signals, for example, a plurality of effects can be given to each musical tone signal at the same time. However, there is a problem that a sufficient acoustic effect cannot be obtained.

An object of the present invention is to make it possible to add a plurality of acoustic effects to each of a plurality of series of tone signals at an arbitrary ratio.

[0007]

According to the present invention, first, a plurality of series (a plurality of channels) of input waveform data, which are provided corresponding to a plurality of effect adding processes, are mixed at a preset mixing ratio. By doing so, it has a mixing means for generating waveform data for effect addition processing. In this means, for example, each of a plurality of series (a plurality of channels) of input waveform data has a multiplication processing unit that multiplies a preset multiplication coefficient and an addition processing unit that adds each multiplication result to a plurality of multiplication processing units. It has the structure provided corresponding to each effect addition process.

Next, there is a mixing ratio setting means such as a setting switch for setting the mixing ratio of each of a plurality of series of input waveform data in the mixing means provided corresponding to each of the plurality of effect adding processes.

Then, it has effect adding processing executing means such as a digital signal processor for executing each of the plurality of effect adding processing as time-division parallel processing for each of the plurality of waveform data obtained from the mixing means.

[0010]

When a plurality of effect adding processes are executed by the effect adding process executing means, in the waveform data input to each effect adding process, each of a plurality of series (a plurality of channels) of input waveform data is previously set. They are mixed at the set mixing ratio. This mixing ratio can be freely set so as to be different for each effect addition process.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. The embodiments of the present invention described below are realized as an electronic keyboard instrument having an effector function.

FIG. 1 is an overall configuration diagram of an embodiment of the present invention. The CPU 103 operates while using the RAM 105 as a work memory based on the control program stored in the ROM 104, and the function key 101 and the keyboard 102.
Is scanned to take in each function key and the operation state of the key, send sound generation control data to the tone generation circuit 106 to control the sound generation operation, and perform various settings for the DSP 107 for effector processing.

The DSP 107 takes in waveform data of musical tones for a plurality of channels generated by the musical tone generating circuit 106,
A plurality of effector processes are executed as parallel time-division processes for those waveform data while accessing the delay memory 108 as necessary.

The waveform data output from the DSP 107 is converted into an analog tone waveform signal by the D / A converter 109, the signal is shaped by a low pass filter (LPF) 110, then amplified by an amplifier 111, and a speaker 112.
Is emitted from.

Next, FIG. 2 is a block diagram of the DSP 107 of FIG. The respective units are connected by a bus 201, and the instruction decoder 203 executes a control program stored in the program memory 202, thereby executing multi-effector processing.

At this time, the multiplication operation in the effector processing is executed by the multiplier 206, and the addition / subtraction operation and the logical operation are executed by the arithmetic logic operation unit (ALU) 207. Also, various coefficients for determining the characteristics of the effector processing are
Various variables stored in the coefficient memory 204 and used in the effector processing are stored in the work memory 205.

Further, in the effector processing, the delay memory 10 of FIG. 1 connected to the bus 201 is used as necessary.
8 is used. Waveform data for a plurality of channels generated in the tone generation circuit 106 is stored in the work memory 205 via the waveform input interface 208, which will be described later.
The waveform buffers are multiplied by a mixing coefficient, which will be described later, and then stored, and the effector processing is executed in parallel for each of the four waveform buffers.

Various control data set from the CPU 103 to the DSP 107 is stored in the CPU interface 20.
9 to the work memory 205. The output waveform data obtained as a result of the multi-effector processing is output from the waveform output interface 210 to the D / A converter 10 of FIG.
9 is output.

In the embodiment of the present invention having the above structure,
As will be described later, the DSP 107 can add up to four acoustic effects to the waveform data. That is, in the DSP 107, a maximum of four effector processes are executed as parallel time division processes at each sampling timing.

Next, the operation principle of the embodiment having the above-mentioned structure will be described. FIG. 3 is a diagram illustrating the principle of the embodiment of the present invention. First, the tone generation circuit 106 of FIG.
It is possible to output waveform data of musical tone signals for n channels of 1 to chn (for example, n = 8) in parallel. The waveform data of each of these channels is polyphonic waveform data generated based on each key depression operation of the keyboard 102 by the performer.

The DSP 107 of FIG. 1 can execute m kinds of effector processing as parallel time-division processing on the above-mentioned waveform data of a plurality of channels. Then, for example, when the first (# 1) effector processing is executed, the waveform data for n channels are multiplied by the mixing coefficients a ₁₁ , a ₁₂ , ..., A _1n and then mixed. By doing so, the waveform data for n channels is mixed with the above mixing coefficient at a ratio of # 1 to the mixed signal obtained.
Effector processing is executed.

In the second (# 2) effector process, the mixing coefficient a is added to each of the waveform data of n channels.
_21, a _22, · · ·, are performed on mixed-obtained mixture signal after a _2n are multiplied, and so on, effector process of the m-th (#m) is, n channels Of the waveform data of each of the mixing coefficients a _m1 , a _m2 , ..., A _mn
Is performed on the mixed signal obtained by mixing after being multiplied by.

That is, in the embodiment of the present invention, each effector process can be executed by mixing each of the n-channel waveform data at an arbitrary ratio. At this time, the performer can freely set the mixing ratio of the waveform data of each channel in each effector process in advance.

The output signals obtained by the respective effector processes of # 1 to #m are mixed with each other, and after being mixed with the original waveform data of n channels, the D / A converter 109 shown in FIG. Is output to.

The specific operation of the embodiment of the present invention based on the above principle will be described below. First, FIG.
Is a CPU general flow showing the overall operation of the control operation executed by the CPU 103. This flow is realized as an operation in which the CPU 103 executes the control program stored in the ROM 104.

First, when the power of the apparatus is turned on, in step S401, the contents of the RAM 105, the CPU 1
The contents of various registers in 03, the internal state of the tone generation circuit 106, the internal state of the DSP 107, etc. are initialized.

After that, each processing of steps S402 to S407 is repeatedly executed. In the function key acquisition process of step S402, a tone color setting key, an effector setting key,
The setting state of the function key 101 such as the modulation key is scanned, and the setting state is stored in the RAM 105 or the like.

In the function key process of step S403, a process corresponding to the setting of each function key 101, for example, a process of instructing the tone generation circuit 106 to change the tone color is executed. Further, as a process particularly related to the present invention, an operation of generating a state table described later according to the setting state of the effector setting key which is the function key 101 and storing it in the RAM 105 is executed.

In the keyboard loading process of step S404,
The key pressing state of the keyboard 102 is scanned, and the key pressing state is taken into the RAM 105 or the like. In the keyboard processing of step S405, the RAM 10 is associated with the above-mentioned key depression state.
Necessary pronunciation control data is set in the pronunciation control data area provided in FIG.

In the effect instruction processing of step S406, the contents of the state table generated in the function key processing of step S403 according to the setting state of the effector setting key which is the function key 101 are transferred to the DSP 107.

In the tone generation processing of step S407, the tone generation control instruction is given to the tone generation circuit 106 by transferring the tone control data set in the keyboard processing of step S405 to the tone generation circuit 106. This allows
The tone generation circuit 106 performs tone generation control operations such as tone generation, tone reduction, and pitch change of tone waveform data.

The above is the processing of the CPU general flow. Here, as described above, the user is
The kind and order of the effector processing to be executed by the above, and the mixing ratio of each waveform data channel in the effector processing can be arbitrarily set for up to four effector processings. This setting can be performed by operating an effector setting key (not shown) which is the function key 101.

When the user operates the effector setting key, which is the function key 101, the setting state is changed as shown in FIG.
RA by the function key acquisition processing in step S402 of
The state table is generated by being taken into M105 and by the function key processing in step S403.

FIG. 5 shows an example of the state table. The pointer value indicates the number of the effector process executed by the DSP 107, and is “00”, “01”, “10”, and “11”.
Respectively correspond to the effector processes executed first, second, third, and fourth in that order.

An effector type based on the setting made by the user is set corresponding to each pointer value. In FIG. 5, effector types such as reverb 1, reverb 2, chorus, and delay are set. In addition, if there are n kinds of effector types that can be set, a code of the number of bits that can identify the n kinds of effector types is set in the effector type section of the state table.

Further, the respective mixing ratios aji of the waveform data for 8 channels of ch1 to ch8 output from the tone generating circuit 106 of FIG. 1 are set corresponding to each pointer value. It should be noted that i is a subscript for identifying channels of waveform data, 1 ≦ i ≦ 8, and j is a subscript for identifying effector processing, 1 ≦ j ≦ 4.

This state table is stored in step S4 of FIG.
It is transferred to the DSP 107 by the effect instruction processing of 06. Next, FIG. 6 is a DSP general flow showing the effector processing operation executed in the DSP 107.
This flow is realized as an operation in which the instruction decoder 203 of FIG. 2 executes the control program stored in the program memory 202.

First, when the power of the apparatus is turned on, the pointer variable is reset in step S601. This pointer variable is "00", "01", "1".
A 2-bit variable value of "0" or "11" is taken and provided in the work memory 205 of Fig. 2. Step S60
At 1, the value of the pointer variable is reset to "00".

Next, the processing of steps S602 to S607 is repeatedly executed in synchronization with the sampling timing. First, in the voice input process of step S602, the waveform data of 8 channels output from the tone generation circuit 106 of FIG. 1 at the current sampling timing is calculated in the original sound buffer OBF, and at the maximum 4
The waveform buffer EBF ₁ ~EBF ₄ as an input to each of the effector process is Ruisan at the rate of mixing coefficients set in the state table. The original sound buffer O
The waveform data calculated on the BF is calculated in step S6 described later.
In the audio output processing of 07, the waveform data subjected to the effector processing is mixed and output.

FIG. 7 is an operation flowchart of the voice input process. First, in step S701, the original sound buffer O
Contents of BF and four waveform buffers EBF _{1 to} EBF ₄
The content of is cleared.

Next, in step S702, after the variable i for identifying the channel is cleared, step S70
By repeating steps 3 to S710, each of the waveform data for 8 channels is input, and the following processing is executed.

In step S703, the waveform data of the i-th channel is substituted into the variable x. In step S704, the waveform data of the i-th channel substituted in the variable x is calculated in the original sound buffer OBF.

In step S705, the variable j for identifying the effector process is cleared, and then step S7.
By repeating 06 to S709, four waveform buffers EBF
The base processing to _{1 to} EBF ₄ is executed.

First, in step S706, the effect instruction processing of step S406 of FIG.
CPU 103 to work memory 20 in DSP 107
By referring to the contents of the state table (see FIG. 5) transferred to No. 5 based on the current values of the variables j and i, the mixing coefficient aji is read.

Next, in step S707, the mixing coefficient aji is added to the value of the waveform data of the i-th channel substituted for the variable x.
Is multiplied by, and it is summed to the _jth waveform buffer EBF _j .

At step S708, the value of the variable j is +1.
To be done. In step S709, it is determined whether or not the value of the variable j exceeds 4, and if the determination result is NO, the process returns to step S706 and the processes of steps S706 to S708 are repeated.

By repeating the above steps S706 to S709, the waveform data of the channel indicated by the variable i is set to _{4 at} the ratio of the mixing coefficients a _{1i to} a _4i set in the state table.
Waveform buffer E for each of the two effector processes
The base is calculated to BF _{1 to} EBF ₄ .

When the determination in step S709 is YES, it is determined in step S710 whether the value of the variable i exceeds 8. If not, the process returns to step S703 and the next value indicated by the new value of the variable i is determined. The process for the waveform data of the channel is repeated.

[0049] By repeating the above steps S703~S710, 8 Ruisan process to four waveforms buffer EBF ₁ ~EBF ₄ channels all waveform data is executed.
When the determination in step S710 is YES, the voice input process of step S602 of FIG. 6 at the current sampling timing ends.

Next, the effector process of step S603 of FIG. 6 is repeated four times while the pointer variable is incremented in step S604 and it is determined in step S605 whether or not the value is "00". Four types of effector processing are executed as parallel time-division processing.

FIG. 8 is a diagram showing an operation flow of the effector processing in step S603 of FIG. In this effector process, the effect instruction process of step S406 of FIG. 4 described above causes the CPU 103 of FIG.
By referring to the contents of the state table (see FIG. 5) transferred to the work memory 205 in 7 based on the current value of the pointer variable, the effector type of each effector process is determined and executed. .

First, in step S801, the CP of FIG.
The code of the effector type corresponding to the current value of the pointer variable is read from the state table transferred from U103 to the work memory 205 of FIG. If the pointer variable is initially “00”, the code corresponding to the effector type of reverb 1 is read in the example of the state table of FIG.

In step S802, it is determined whether or not the effector type code is set in the state table in correspondence with the current pointer variable value. If the determination result is NO, the effector process is not executed. In the example of FIG. 5, since the effector type is set for all pointer values, the determination in step S802 will not be NO.

If the above determination result is YES, step S
At 803, the first waveform buffer EBF ₁ corresponding to the current pointer variable value “00” in the work memory 205.
Waveform data is read from.

Next, in step S804, the effector processing subroutine corresponding to the effector type read from the state table in step S801 is read and executed for the waveform data read from the waveform buffer EBF _1. To be done.

When the effector processing for the effector type corresponding to the current pointer variable value "00" is completed by the processing in steps S803 and S804, step S8 is performed.
At 05, the waveform data obtained as a result of the above-described effector processing is overwritten in the _first waveform buffer EBF ₁ corresponding to the current value “00” of the pointer variable in the work memory 205, and the 1st waveform buffer EBF ₁ in FIG. End effector processing of times.

Next, in step S604, the value of the pointer variable is incremented from "00" to "01", and the determination in step S605 becomes NO, and then again.
The effector process of step S603 is executed.

At this time, since the value of the pointer variable is "01", the code of the effector type corresponding to the current value "01" of the pointer variable is read from the state table in step S801 of FIG. . In the example of FIG. 5, the code of the effector type of the reverb 2 is read.

In step S803, the waveform data is read from the second waveform buffer EBF ₂ corresponding to the current pointer variable value “01” in the work memory 205, and in the next step S804, the waveform buffer is read. E
For the waveform data read from the BF _2, the effector processing subroutine corresponding to the effector type corresponding to the current pointer variable value “01” read from the state table in step S801 is read. Execution is performed, and the result of the above-described effector processing is overwritten in the waveform buffer EBF ₂ in step S805.

After the effector processing of step S603 of FIG. 6 is completed, the value of the pointer variable is incremented from "01" to "10" in step S604,
After the determination in step S605 is NO, the effector process in step S603 is executed again.

At this time, since the value of the pointer variable is "10", the code of the effector type corresponding to the current value "10" of the pointer variable is read from the state table in step S801 of FIG. . In the example of FIG. 5, the chorus effector type code is read.

Further, in step S803, the waveform data is read from the third waveform buffer EBF ₃ corresponding to the current pointer variable value “10” in the work memory 205, and in the next step S804, the waveform buffer is read. E
For the waveform data read from BF _3, the effector processing subroutine corresponding to the effector type corresponding to the current pointer variable value “10” read from the state table in step S801 is read out. Execution is performed, and the result of the above-described effector processing is overwritten in the waveform buffer EBF ₃ in step S805.

After the effector processing of step S603 of FIG. 6 is completed again, the value of the pointer variable is incremented from "10" to "11" in step S604, and the determination in step S605 becomes NO, and then step S603. Effector processing is executed.

At this time, since the value of the pointer variable is "11", the code of the effector type corresponding to the current value "11" of the pointer variable is read from the state table in step S801 of FIG. . In the example of FIG. 5, the code of the delay effector type is read.

In step S803, the waveform data is read from the fourth waveform buffer EBF ₄ corresponding to the current pointer variable value “11” in the work memory 205, and in the next step S804, the waveform buffer is read. E
For the waveform data read from the BF _4, the effector processing subroutine corresponding to the effector type corresponding to the current pointer variable value “11” read from the state table in step S801 is read out. After that, the result of the above-described effector processing is overwritten in the waveform buffer EBF ₄ in step S805.

Finally, after the effector processing in step S603 in FIG. 6 is completed, the value of the pointer variable is incremented in step S604. However, since the pointer variable is a 2-bit variable value as described above, the pointer variable When the value "11" of is incremented, the value returns to "00".

In this way, the pointer variable is "00".
6 is reached, the determination in step S605 of FIG.
S is reached, and the effector processing of four times in steps S603 to S605 is completed.

In the timer processing of step S606, FIG.
Each time an interrupt synchronized with the sampling timing is input by the timer 211, the process goes to the audio output process of the next step S607. Then, the audio output processing in step S607, 4 times step S603 effector processing results of each output waveform data obtained four waveforms buffer EBF ₁ ~EBF ₄ in the work memory 205,
The original sound buffer OBF in the work memory 205 is mixed with the previously calculated base waveform data for eight channels (see step S704 in FIG. 7), and the mixing result is passed through the waveform output interface 210 to D / in FIG. A converter 10
9 is output as output waveform data.

Since the processes of steps S602 to S607 can be executed within one sampling period, the result of the timer process of step S606 is that the output waveform data is accurate in the voice output process of step S607. D in synchronization with the sampling timing
It is output to the / A converter 109.

In the embodiment described above, as shown in FIG. 5, it is possible to execute reverbs having different characteristics in parallel even with the same reverb, and depending on the setting, up to four types of the same reverb can be executed. It is possible to perform reverbs in parallel.

In the above embodiment, the DSP 107
Is configured so that up to four effector processes can be executed as parallel time-division processes at each sampling timing. However, the present invention is not limited to this, and the DSP processing capacity has a margin. If so, it can be configured to be able to execute any number of effector processes of five or more.

Finally, FIG. 9 is a principle explanatory view showing another embodiment. In the above-described embodiment of the present invention, n is set for each of the plurality of effector processes executed in parallel.
A configuration is disclosed in which waveform data of channels are mixed at an arbitrary ratio and executed. On the other hand, in FIG. 9, for the effector process of the first stage of the effector processes performed in one effector process or cascade, each of the n-channel waveform data has mixing coefficients b ₁ , b ₂ , ..., b _n are mixed and input at a ratio.

With such a configuration, one or a plurality of effector processes connected in cascade can be executed on the waveform data obtained by mixing the waveform data generated in each channel at an arbitrary ratio. You can

[0074]

According to the present invention, when a plurality of effect adding processes are executed by the effect adding process executing means, in the waveform data input to each effect adding process, a plurality of series of input waveform data are input. It is possible to set each to be mixed at an arbitrary mixing ratio set in advance.

As a result, for example, in the keyboard musical instrument, the tone generation channel assigned to the musical tone generated in the low tone range and the tone generation tone assigned to the high tone range may be changed, or the tone generation channel may be changed for the accompaniment tone and the melody tone. By doing
It is possible to complicatedly change the degree of effect addition for each range, and it is possible to obtain various acoustic effects.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a DSP 107.

FIG. 3 is a diagram illustrating the principle of the present invention.

FIG. 4 is a diagram showing a CPU general flow.

FIG. 5 is a diagram showing an example of a state table.

FIG. 6 is a diagram showing a DSP general flow.

FIG. 7 is an operation flowchart of voice input processing.

FIG. 8 is a diagram showing an operation flow of effector processing.

FIG. 9 is an explanatory diagram of another embodiment.

[Explanation of symbols]

 101 Function Key 102 Keyboard 103 CPU 104 ROM 105 RAM 106 Tone Generation Circuit 107 DSP 108 Delay Memory 109 D / A Converter 110 LPF 111 Amplifier 112 Speaker 201 Bus 202 Program Memory 203 Command Decoder 204 Coefficient Memory 205 Work Memory 206 Multiplier 207 Arithmetic and logic unit (ALU) 208 Waveform input interface 209 CPU interface 210 Waveform output interface 211 Timer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Hosoda 3-2-1 Sakaemachi, Hamura-shi, Tokyo Casio Computer Co., Ltd. Hamura Technical Center

Claims (1)

[Claims] 1. Waveform data for effect addition processing is provided by corresponding to each of a plurality of effect addition processing, and by mixing each of a plurality of series of input waveform data at a preset mixing ratio. Mixing means, a mixing ratio setting means for setting a mixing ratio of each of the plurality of series of input waveform data in the mixing means provided corresponding to each of the plurality of effect addition processes, and a plurality of mixing ratios obtained from the mixing means. Effect adding process executing means for executing each of a plurality of effect adding processes for each of the waveform data of 1.