JPH0573700U - Sound effect generator - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the reverberation sound from being interrupted when the addition of the reverberation sound is stopped. In a sound effect generating means 2a having a delaying means 8 for delaying an input signal, multipliers 221 and 161 are provided on the input side and the output side of the delaying means 8 respectively, and noise is generated in the output signal of the sound effect generating means 2a. When the change that occurs is added to the sound effect generating means 2a, the control unit 18a causes the multiplier 16
The coefficient 0 is supplied to 1 to prevent the noise from being output in the signal cutoff state. When stopping the generation of the sound effect from the sound effect generating means 2a, the control unit 18a causes the multiplier 16 to operate.
1 is supplied with a coefficient 1 to provide a signal passing state, the signal currently being delayed by the delay means 8 is output via the multiplier 161, and a coefficient 0 is supplied to the multiplier 221 to provide a signal cutoff state. As a result, the supply of a new signal to the delay means 8 is stopped, and a new delayed signal is prevented from being generated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for generating a sound effect such as reverberation or echo based on a voice signal in order to add a time control system effect such as reverberation or echo to a voice signal such as a musical tone signal.

[0002]

[Prior Art]

 Conventionally, as an effect adding device provided with the above-described sound effect generating device, there is one shown in FIG. 3, for example. This effect adding device has a reverberant sound generating means 2 for generating a sound effect, for example, a reverberant sound based on an input audio signal, and the reverberant sound from the reverberant sound generating means 2 is output to The signal is added and the reverberant sound is added to this audio signal and output.

In the reverberation sound generating means 2, for example, as shown in FIG. 4, the sound signal input via the adder 6 is delayed by the delay means 8. The delayed signal is multiplied by the feedback coefficient fbk (<1) in the multiplier 10 and then supplied to the adder 6 via the switch 12. That is, the delay signal of the delay means 8 is fed back to its input side after being multiplied by the feedback coefficient fbk. This produces a reverberant sound. The reverberation sound from the delay means 8 is multiplied by the reverberation level coefficient lev in the multiplier 14, output through the switch 16, and supplied to the adder 4 shown in FIG.

The feedback coefficient fbk and the reverberation level coefficient lev are controlled by the control unit 18 in response to the operation of an operator not shown, and the delay time dt in the delay means 8 is not shown. Is controlled by the control unit 18. The delay time dt can be changed to change the reverberation sound density, the feedback coefficient fbk can be changed to change the reverberation sound attenuation length, and the reverberation level coefficient l ev can be changed. By doing so, the level of the reverberation sound with respect to the audio signal can be changed.

By the way, the switches 12 and 16 are turned on in a normal state. For example, when changing the delay time of the delay means 8, the control unit 18 turns off the switches 12 and 16. When the delay time is changed, the audio signal in the delay means 8 has a discontinuity and noise is generated. In order to prevent this noise from being output to the adder 4, the switches 12 and 16 are turned off to change the delay time before changing the delay time of the delay means 8, and the discontinuous portion is delayed. After waiting for the output from the means 8, the switches 12 and 16 are turned on. Note that the switch 12 is also turned off by cutting off the return path between the input and output of the delay means 8 to prevent noise due to the discontinuity from circulating in the delay means 8 and promptly attenuating this noise. This is to make it happen.

The switches 12 and 16 are also used for control of adding reverberant sound or stopping addition of reverberant sound. That is, when adding reverberation, the control unit 18 turns on the switches 12 and 16, and when stopping adding reverberation, the control unit 18 turns off the switches 12 and 16.

[0007]

[Problems to be solved by the device]

 However, in such a reverberation sound generating means, when the switches 12 and 16 are turned off in order to stop adding the reverberation sound as described above, the reverberation sound being output is interrupted on the way, which is very unnatural. It will be a strange sound.

[0008]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and in a sound effect generator including a delay means for delaying an input signal, a signal interrupting means provided on each of an input side and an output side of the delay means. And when changing the output signal of the sound effect generator to generate noise in the sound effect generator, when the signal disconnecting means on the output side is turned off to stop the sound effect from being generated by the sound effect generator. And a control means for setting the signal connection / disconnection means on the output side to the signal passing state and the signal connection / disconnection means on the input side to the cutoff state.

[0009]

[Action]

 According to the present invention, an appropriate signal connection / disconnection means can be connected / disconnected according to the purpose, and when performing operation or control that generates noise in the output signal of the effect sound generator, the signal connection / disconnection on the output side is performed. No noise is output because the means is cut off. Further, when the addition of the sound effect to the input signal is stopped, the signal interrupting means on the input side is turned off, so that no new signal is input to the delay means and a new sound effect to the input signal is added. The addition is canceled.

[0010]

【Example】

 In the present embodiment, as shown in FIG. 1, the present invention is applied to a reverberation sound generating means 2a used in a reverberation sound adding device 20. This reverberation sound adding device 20 has the conventional structure shown in FIG. Similar to the reverberant sound adding device, it has a reverberant sound generating means 2a and an adder 4. In the reverberant sound adding device 20, the reverberant sound generating means 2a generates a reverberant sound based on an input signal, for example, a musical sound signal, and the reverberant sound is added to the musical sound signal by the adder 4 to add the reverberant sound to the musical sound signal. To be done.

The reverberation sound generating means 2a has substantially the same configuration as that of the conventional reverberation sound generating means 2 shown in FIG. 4, and the same parts are designated by the same reference numerals and the description thereof will be omitted. The reverberation sound generating means 2a is different from the reverberation sound generating means 2 of FIG. 4 in that the switches 12 and 16 are replaced by multipliers 121 and 161 and a new input side of the adder 6 is used. Is that a multiplier 221 is provided.

These multipliers 121, 161, 221 are controlled by the control unit 18a, and when a coefficient 1 is supplied to them, a signal passes, and when a coefficient 0 is supplied from the control unit 18a, a signal is passed. Is cut off. That is, these multipliers 121, 161, 221 function as a signal connecting / disconnecting means. Then, by making the change in the coefficient a little gentler like the charge curve and discharge curve of a capacitor, it is possible to prevent click noise even when there is an interruption when there is a signal. The control unit 18a controls the multipliers 10 and 14 and the delay unit 8 as in the conventional control unit 18.

In the reverberation sound generating means 2a configured as described above, in the normal state, that is, in the state of generating reverberation sound, the coefficient 1 is supplied from the control unit 18a to the multipliers 121, 161, 221 and the signal passing state. And As a result, reverberant sound is generated as in the conventional case of FIG.

If, for example, the control unit 18a changes the delay time of the delay unit 8 according to the operation of an operator (not shown) while the coefficient 1 is being supplied to each of the multipliers 121, 161, 221, As described above, the output signal of the reverberation adding device 20 contains noise. Therefore, before the delay time is changed or the sound source is changed, the coefficient 0 is supplied from the control unit 18a to the multipliers 121 and 161 to put the multipliers 121 and 161 into the signal cutoff state. This can prevent noise from being output from the reverberation adding device 20. Then, after the above change is completed, the coefficient 1 is supplied again to the multipliers 121 and 161 to bring them into the signal passing state.

Further, in order to stop adding the reverberation sound in response to the operation of an operator (not shown), if the control unit 18a simply sets the coefficient supplied to the multiplier 161 to 0, the reverberation sound is interrupted midway. In order to prevent this, the control unit 18a supplies the coefficient 0 to the multiplier 221 while keeping the coefficient 1 to the multipliers 121 and 161. In this case, since the multiplier 221 is in the cutoff state, the musical tone signal is not newly supplied to the reverberation sound generating means 2a. However, since the multipliers 121 and 161 are in the passing state, the reverberant sound currently generated in the loop of the delay unit 8, the multiplier 10 and the adder 6 is output without interruption in the middle. When the addition of the reverberation sound is restarted, the coefficient 221 is supplied again to the multiplier 221, so that the signal passes.

FIG. 2 shows another embodiment. The reverberation sound adding device 201 of this embodiment has a reverberation sound generating means 2b (which may have the same configuration as the reverberation sound generating means 2a shown in FIG. 1 or has a delay means. In this case, it may have a different structure from that of the means 2a, provided that it does not include a multiplier which is a means for cutting off a signal. The containers 222 and 162 are provided. The multipliers 222 and 162 are also controlled by a control unit (not shown).

That is, in the state where the reverberant sound is added, the coefficient 1 is supplied to both the multipliers 162 and 222, and the musical tone signal is supplied to the reverberant sound generating means 2b. The reverberant sound from the generating means 2b is supplied to the adder 4a.

For example, when noise is output from the reverberation sound generating means 2b as a result of changing the delay time of the delay means in the reverberation sound generating means 2b, the multiplier 162 is connected to the multiplier 162 before making such a change. The supplied coefficient is set to 0 to prevent the noise generated by the reverberation sound generating means 2b from being supplied to the adder 4a. After the noise is completely attenuated in the reverberation sound generating means 2b, the coefficient supplied to the multiplier 162 is set to 1, and the output of the reverberation sound generating means 2b is supplied to the adder 4a.

When the addition of the reverberation sound is stopped, the coefficient supplied to the multiplier 162 remains 1, and the coefficient supplied to the multiplier 222 is 0. As a result, a new musical tone signal is not supplied to the reverberation sound generating means 2b, and the generation of a new reverberation sound is stopped. However, since the reverberant sound currently being generated in the reverberant sound generating means 2b is output to the adder 4a via the multiplier 162, the reverberant sound is not interrupted on the way.

In the above embodiment, the reverberation sound generating means 2a and 2b are used as the sound effect generating means, but the present invention is applied to other sound effect generating means of the time control system such as the echo effect generating means. Can be implemented. Further, in the above embodiment, the multiplier is used as the signal connecting / disconnecting means, but a switch may be used as in the conventional example. The above device can be realized by an analog or digital circuit, or can be realized by software using a microcomputer or DSP.

[0021]

[Effect of the device]

 As described above, according to the present invention, when the input and output sides of the sound effect generating means are provided with signal interrupting means respectively, and there is a change in the state where the sound effect generating means outputs noise, Since the signal connection / disconnection means on the output side is turned off before the change, no noise is output. In addition, before stopping the generation of reverberation sound, the signal disconnecting means on the output side is set to the signal passing state and the signal disconnecting means on the input side is set to the signal interrupting state, so the sound effect currently being generated is It is output without interruption, and after the sound effect that is being generated ends, the addition of effects is stopped.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a reverberation sound adding device implementing a sound effect generating means according to the present invention.

FIG. 2 is a block diagram of another embodiment.

FIG. 3 is a block diagram of a conventional reverberation sound adding device.

FIG. 4 is a block diagram of reverberation sound generating means used in the reverberation sound adding device of FIG.

[Explanation of symbols]

 2a Reverberation sound generating means 2b Reverberation sound generating means 8 Delay means 161 Multiplier (Signal interrupting means) 162 Multiplier (Signal interrupting means) 221 Multiplier (Signal interrupting means) 222 Multiplier (Signal interrupting means)

Claims (1)

[Scope of utility model registration request] 1. A sound effect generator provided with a delay means for delaying an input signal, wherein signal interrupting means provided on each of an input side and an output side of the delay means and an output signal of the sound effect generator generate noise. When the change to be generated is applied to the sound effect generator, the signal connection / disconnection means on the output side is turned off, and when the effect sound generation by the sound effect generator is stopped, the signal connection / disconnection means on the output side is passed. And a control means for setting the input side signal connecting / disconnecting means to a cutoff state.