JP3022170B2 - Control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a mixed state of a plurality of signals when performing signal processing on an input signal such as a tone signal or a voice input signal.

[0002]

2. Description of the Related Art FIG. 1 shows a circuit configuration of a conventional electronic musical instrument. In this electronic musical instrument, the generation of musical sounds and the application of effects are controlled by a microcomputer. The address / data bus 14 has a keyboard 4 via a CPU (central processing unit) 1, a RAM 2, a ROM 3, a keyboard I / F (interface) 5, an LCD 7 via an LCD I / F (interface) 6, and a panel switch I.
A panel switch 9, a sound source 10, a DSP 11, and the like are connected via an / F (interface) 8.

The keyboard 4 has a large number of keys. When each keyboard is operated, the operation is detected by the keyboard I / F 5 as key operation information. As the performance information input means, in addition to the keyboard 4, a performance information receiving device based on the MIDI standard may be connected to the address / data bus 14, and the performance information may be input from another device.

[0004] The CPU 1 executes various processes for generating musical tones, giving effects and the like according to programs stored in the ROM 3. CPU for sound generation
1 performs a process of detecting a key pressed on the keyboard 4, a process of supplying pitch information and a key-on signal relating to the pressed key to the sound source 10 to generate a digital tone signal, and the like. In addition, regarding the effect addition, the CPU 1 performs processing of reading various effect control parameters from the ROM 3 or the RAM 2 and supplying them to the DSP 11, and processing for controlling writing and reading of the RAM in the DSP.

The sound source 10 has a plurality of tone channels for generating digital tone signals, and tone signals from these channels are divided into DSP 11
Supplied to When multiple keys are pressed simultaneously on the keyboard 4,
Pitch information and key-on signals corresponding to these keys are supplied to a plurality of tone generation channels, and tone signals are simultaneously generated from the respective tone generation channels.

The DSP 11 applies various sound effects such as reverberation, chorus, distortion, and flanging effects to the tone signal from the sound source 10, and outputs the resulting signal to the DAC 12. The DAC 12 performs digital / analog conversion, and the converted analog signal is sent to the sound system 13. The sound system 13 includes an amplifier and a speaker, and after amplifying an analog signal to a predetermined level,
Sound is emitted as acoustic energy by the speaker.

The DSP 11 receives, via an external input I / F (interface) 16, an analog signal of an electric musical instrument such as an electric guitar from an external input terminal 15 or a natural musical instrument sound or voice converted into an analog signal by a microphone (not shown). May be input. External input I / F1
6 converts an analog signal into a digital signal and converts
Feed to 1. When an external instrument sound is input to the DSP 11, the electronic musical instrument in FIG. 1 functions as an effector.

FIG. 2 is a block diagram for explaining the processing in the DSP 11. Actually, processing corresponding to this block diagram is realized by a microprogram. The digital signal input from the sound source 10 or the external input I / F is divided into two, one of which is input to the multiplier 18 and the other is supplied to the effect applying unit 17. The output of the effect applying unit 17 is input to the multiplier 19. The multipliers 18 and 19 multiply the respective input signals by multiplication coefficients d and w, and output the multiplication results to the adder 20. The adder 20 adds the multiplication results of the multipliers 18 and 19, and outputs the addition result to the DSP 5
Output as output.

The mixed state of the signal to which the effect is not applied (dry signal) input to the multiplier 18 and the signal to which the effect is applied (wet signal) input to the multiplier 19 is determined by the multiplier 1
It is determined by the values of coefficients d and w of 8 and 19. The simplest control method is to control the coefficients d and w individually.

The panel operator 9 includes operators 21 and 22 as shown in FIG. 3, which can be operated by a player. The operators 21 and 22 are variable resistors, and the output, which is an analog voltage, is supplied to the panel operator I / F 8, converted into digital signals and held as outputs A and B. The CPU 1 can obtain the outputs A and B of the operators 21 and 22 by accessing the panel operator I / F as needed.

When the operating elements 21 and 22 are moved, their digital signal outputs A and B become 0.00 ≦ A ≦ 1.00 and 0.00.
It is assumed that it changes in the range of ≦ B ≦ 1.00. here,
If the multiplication coefficients w and d are made to correspond to each other as w = A and d = B, the mixed state of the dry signal and the wet signal becomes
It is controlled by operating 1,22. But,
In some cases, it may be desirable to control the ratio between the dry signal and the wet signal. In this case, the objective is achieved by operating only the operator 21 by making the correspondences as w = A, d = 1-A. Was.

However, in this method, since a system having two independently controllable parameters (w and d) is controlled by one parameter, there is a state that cannot be set. To avoid this, consider a configuration in which a multiplier is added to the configuration of FIG. As shown in FIG. 4, the adder 2 of FIG.
The output of 0 is input to the multiplier 23 to give the coefficient t. Then, the coefficients are expressed as w = A, d = 1−
The objective can be achieved by responding as A, t = B,
In this case, the number of multipliers realized by the DSP increases by one. There is a limit to the number of multipliers that can be realized per sampling cycle by the DSP, and there is a demand to secure as many multipliers as possible for effect calculations in order to provide complex effects.

[0013]

SUMMARY OF THE INVENTION The present invention solves the above disadvantages and provides a method for controlling the mixing ratio of two signals without increasing the number of multipliers used in a DSP. .

[0014]

Means for Solving the Problems A control device according to a first invention comprises first and second operators which can be operated independently,
First and second multipliers respectively connected to the signals of the system,
Switching means for switching between the first state and the second state;
When the switching means is in the first state, the first operation is performed.
The signal balance of the two systems is controlled in accordance with the operation of the crop.
And the two systems according to the operation of the second operator.
Controlling the signal levels of the first and second operations.
The first and second coefficients are calculated and generated according to the operation of the child.
And the switching means is in the second state.
The first multiplier according to the operation of the first operator
To the operation of the second operator.
Control means for giving a coefficient to the second multiplier . Further, in the control device according to the second invention, in addition to the configuration of the first invention, the control means is executed by software, and the first and second multipliers are DSPs.
Is characterized by a time-sharing operation of

[0015]

According to the first aspect, when in the first state, the first
Controls the signal balance of the two systems
The signal level of the two systems is controlled by the second operator,
In this state, the signal level of one system is controlled by the first control.
And the second operator controls the signal level of the other system.
Is controlled. According to the second invention, the control means
The control is executed by software, and the first and second multipliers are realized by executing the DSP multiplier in a time-division manner.

[0016]

First, an outline of this embodiment will be described. When calculating the output value in FIG. 4 described in the related art, output = (wet * w + dry * d) * t (1) Here, wet represents a wet signal, and is a signal input to the multiplier 19. dry represents a dry signal and is a signal input to the multiplier 18. w is the multiplier 1
The multiplication coefficient given to 9 and d is the multiplication coefficient given to the multiplier 18. t is a multiplication coefficient given to the multiplier 23.

The multiplication coefficient w is made to correspond to the output A of the manipulator 21, and w = A. The multiplication coefficient d is set to d = 1−A so that the multiplication coefficient d can be controlled by the operator 21. Further, the multiplication coefficient t
Correspond to the output B of the operation element 22 and t = B. In this state, when Expression (1) is expressed, output = (wet * A + dry * (1-A)) * B (2) When the equation (2) is expanded, output = wet * A * B + dry * (1-A) * B (3) is obtained. Here, if the multipliers 18 and 19 are controlled with A * B = w and (1-A) * B = d, the multiplier 23 of FIG. 4 is unnecessary. Therefore, the configuration of FIG. 2 can be applied as it is. On the other hand, to obtain w and d,
Each of the multiplications is required, but this can be performed by the CPU, and only when the operator changes. As a result, appropriate balance control can be performed without increasing the number of multipliers required in the DSP. Further, since the configuration of FIG. 2 can be applied as it is, it is possible to select a method in which an operator and a coefficient correspond one-to-one, such as w = A and d = B, and can use them as needed. This can be realized by processing a method for obtaining a coefficient from a change in the operating element by software.

Next, an embodiment of the present invention will be described with reference to the drawings. Since the electronic musical instrument to which the present invention is applied has the same configuration as that of FIG. 1, the description of the configuration will be omitted. FIG. 5 is a block diagram showing a function relating to the present invention. Since the parts realized by the DSP 11 are the same as those in FIG. 2, the effect imparting unit 17, the multipliers 18, 19, and the adder 20
Please refer to the description of FIG. 2 for the description of the connection state and the control method. The controls 21 and 22 are the same as those shown in FIG.

Outputs A and B of the operators 21 and 22 are branched into two and input to calculation blocks 27 and 28, respectively.
A predetermined operation is performed in these calculation blocks, and a multiplier 1
Two sets of multiplication coefficients w and d to be given to 8 and 19 are obtained. Any one of these coefficients is selected according to the operation of the changeover switch 24 and is given to the multipliers 18 and 19.

The changeover switch 24 is one of the panel operators in FIG. 1, and is provided on the panel of the electronic musical instrument.
When the changeover switch 24 is operated by the player, the switches 25 and 26 are interlocked and switched. Thus, every time the changeover switch 24 is operated, the calculation block 27
And the calculation result of the calculation block 28 are alternately selected and supplied to the multipliers 18 and 19.

In the calculation block 27, w ← A * B, d ←
Since the operation of (1-A) * B is performed, calculation block 2
7 is selected, the balance between the wet signal and the dry signal is controlled by the operation element 21 and the operation element 22 is selected.
Can control the whole level. The calculation block 28
Then, the operation of w ← A and d ← B (substitution rather than the operation) is performed. Therefore, when the operation result of the calculation block 28 is selected, the wet level is directly controlled by the operator 21 and the operator 22 is controlled. Directly control the dry level.

As described above, the control method of the wet-dry balance can be selected according to the player's preference and situation.
Further, it is not necessary to increase the number of multipliers required in the DSP operation. Actually, the switch units 25 and 26 in FIG.
The calculation blocks 27 and 28 are realized by the CPU 1 executing a program. Therefore, this operation will be described with reference to the flowcharts of FIGS.

When the power of the electronic musical instrument is turned on by the player, the control unit 1 initializes each unit (step s).
1). Next, when the player selects a timbre to be used for the tune to be played by a timbre selection switch (not shown) on the panel operator 9, R is selected according to the selected timbre number.
The corresponding tone color information is read from the OM 3 and the read tone color information is sent to all the channels of the sound source 10. If there is no operation for tone color selection, no processing is performed (step s2).

In step s3, when the player selects an effect to be used for the tune to be played by an effect selection switch (not shown) on the panel operator 9, the corresponding effect is read from the ROM 3 according to the selected effect number. Is read and written into a microprogram register (not shown) of the DSP 11.

In step s4, if key press / key release information is generated by the player flicking the keyboard 4, corresponding processing is performed. If the information from the keyboard section 4 is a key press event, the sound source 10 is searched for an empty channel,
A pronunciation instruction is given to the channel. In the case of a key release event, a mute instruction is issued to the channel of the sound source 10 that is emitting the sound of the released key.

In step s5, when the player operates the operator, corresponding processing is performed, which will be described in detail later. In step s6, processing not related to this embodiment is executed. Thereafter, the flow returns to step s2, and the above operation is repeated.

When the CPU 1 executes step s5, a subroutine shown in FIG. 7 is started. Step s1
At 0, the panel operator I / F of FIG. 1 is scanned to obtain operation information of various operators. As a result, the changeover switch 24
Is determined (step s11), and if an operation is performed, the value of the register SW is inverted (step s11).
12). That is, when the value of the register SW is 0, it is set to 1, and when it is 1, it is set to 0. Thereafter, the process proceeds to step S13.

When the determination in step s11 is "no", that is, when the changeover switch 24 is not operated, the process also proceeds to step 13. In step s13, the register ol
It is determined whether d_A is not equal to the output A of the control 21 or the register old_B is not equal to the output B of the control 22. This determination is “yes” if the player operates one of the operators 21 and 22, and the process proceeds to step 14. If neither of the controls is operated, “no” is returned to the main routine (FIG. 6).

In step 14, it is determined whether or not the register SW is "1". If the value is "1", the multiplication result of A * B is stored in the register w, and the operation result of (1-A) * B is stored in the register d. Store. When the register SW is "0", the determination in step 14 is "no", so that in step s16, A is stored in the register w and B is stored in the register d. In step s17, the calculation result obtained in step s15 or s16 is sent to the DSP 11. Step s15
Is executed, the DSP 11 realizes a wet dry balance according to the operation of the operation element.

In step s18, the current controls 21, 2
A and B, which are output values of 2, are stored in registers old_A and old_B. Thereafter, the process returns to the main routine (FIG. 6). Note that d ← (1-A) * B in step s15 of FIG.
However, the present invention is not limited to this, and d ← √ (1-A ＾ 2) * B may be used. This calculation is performed to make the level of the audibility constant, and it is possible to prevent the audibility level from changing by operating the operating element 21. Although the calculation becomes complicated, by changing the square root calculation to a table lookup method,
It can also escape the complexity of computation.

In the embodiment, when the changeover switch is operated, the outputs of the operators 21 and 22 are used as they are and the multipliers 18 and
19, the outputs A and B of the operators 21 and 22 are 0.00 ≦ A ≦ 1.00, 0.00 ≦ B ≦ 1.00.
, And it is often necessary to perform some calculation. In this embodiment, the assignment is simply performed, but an operation may be performed.

[0032]

As described above, the present invention has an effect that signals of two systems can be mixed by a control method that is easy for a player to control without increasing the number of multipliers in hardware. Further, since the method of controlling the two signals can be selected, there is an advantage that the method can be changed according to the convenience of the player.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an electronic musical instrument according to the present invention and a conventional technique.

FIG. 2 is a diagram illustrating processing in a DSP 11 according to the present invention and a conventional technique in a block diagram.

FIG. 3 is a view showing an operator according to the present invention and a conventional technique.

FIG. 4 is a block diagram illustrating a process performed by a DSP 11 according to the related art.

FIG. 5 is a diagram illustrating the present invention with a block diagram.

FIG. 6 is a flowchart for explaining the operation of an electronic musical instrument including the present invention.

FIG. 7 is a flowchart for explaining the operation of the electronic musical instrument including the present invention.

[Explanation of symbols]

1: CPU (central processing unit), 2: RAM (random access memory), 3: ROM (read only memory), 4: keyboard, 5: keyboard I / F (interface), 6: LCD1 / F (interface), 7: L
CD, 8: panel operator I / F (interface),
9: panel operator, 10: sound source, 11: DSP (digital signal processor), 12: DAC (digital-analog converter), 13: sound system, 14: address / data bus, 15: external input terminal, 16: external input I / F, 17: effect imparting unit, 18, 19, 23: multiplier, 20: adder, 21, 22: operator, 24: changeover switch, 25, 26: switch unit, 27, 28: calculation block

Claims (2)

(57) [Claims] A first and a second manipulator which can be operated independently, a first and a second multiplier respectively connected to signals of two systems, and a switching means for switching between a first state and a second state. And when the switching means is in the first state, the first operation is performed.
The signal balance of the two systems is controlled in accordance with the operation of the crop.
And the two systems according to the operation of the second operator.
Controlling the signal levels of the first and second operations.
The first and second coefficients are calculated and generated according to the operation of the child.
And the switching means is in the second state.
The first multiplier according to the operation of the first operator
To the operation of the second operator.
Control means for providing a coefficient to the second multiplier . 2. The control means is executed by software,
2. The control device according to claim 1, wherein the first and second multipliers are configured by a time division operation of a DSP.