JPH07306689A - Sound effect adding device - Google Patents

Abstract

PURPOSE:To provide a sound effect adding device which does not change the volume feeling before and after the operation of an operation piece for giving sound effect while making the most of the property of tones and can change sound effect naturally by controlling the mixed sound signal of original sound and effective sound, according to the kind of tones and the application state of effective sound. CONSTITUTION:A sound effect adder, which has an effective sound ingredients making means 2 having sound effect ingredients, based on the input sound signals, an effective sound control means 3 for controlling the output value of the produced effective ingredients, and a mixing means 4 for mixing the input sound signal with the effective sound controlled by the effective sound control means 3, is constituted, having an operation piece 30 for designating the tons, a table selector 31 for selecting the optimum control value deciding table, according to the designated tones, a control value deciding means 6 for designating the control value to control the sound signal outputted from the mixing means 4, based on the control value of effective sound controlled by the effective sound control means 3, on the selected control value deciding table, and a sound signal control means 7 for controlling the mixed sound outputted from the mixing means 4, based on the decided control value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound effect adding device which is used in, for example, an audio amplifier, karaoke, car stereo, electronic musical instrument, etc. and which adds a sound effect to an input sound signal.

[0002]

2. Description of the Related Art Conventionally, in a sound effect adding device installed in an audio device such as an audio amplifier, a karaoke machine, a car stereo, an electronic musical instrument, etc., a sound effect such as reverberation is added to an input sound signal. With the addition, it is possible to obtain a comfortable sound in the high range, a depth and breadth of the output sound, and a preferable audible feeling such as the illusion of the sound.

As such an acoustic effect adding device, for example, a mechanical reverberation device such as a spring type or an iron plate type,
Electronic reverberation devices such as the BBD system and the DSP system are known.

The mechanical reverberator utilizes the vibration characteristics of a plate-shaped or coil-spring-shaped metal member, and the electronic reverberator combines a plurality of sound signals having different delay times to reverberate the input sound signal. It is something to add.

However, the conventional reverberation adding device is shown in FIG.
As shown in the schematic configuration diagram of FIG. 5, the original sound input to the input unit and the effect sound generated based on the original sound are simply synthesized and output by the reverb component creating unit and the reverb volume.

Therefore, in the conventional sound effect adding device,
Although the volume of the original sound does not change, if you increase the volume of the sound effect, you will feel that the overall volume has increased, and if you decrease the volume of the sound effect, you will feel that the overall volume has decreased. There is a feeling of strangeness in the sound before and after, and improvement is required.

Further, the acoustic effect of the conventional audio equipment is uniformly applied according to the operation of the operator regardless of the tone color, and it is impossible to add the acoustic effect utilizing the characteristic corresponding to the tone color.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional audio equipment, and the original sound and the sound effect are changed depending on the kind of the tone color and the degree of the sound effect. A sound effect adding device that controls a mixed sound signal to make the best use of the characteristics of a tone color, and the sound effect before and after the operation of an operator for giving a sound effect does not change and the sound effect can be changed naturally and smoothly. The purpose is to provide.

[0009]

FIG. 1 is a diagram for explaining the principle of the acoustic effect adding apparatus of the present invention.

As shown in the figure, the first invention is an input means 1
Effect component creating means 2 for creating a sound effect component based on the input sound signal input to the sound effect control means 3 and effect sound controlling means 3 for controlling the output value of the effect component created by the effect component creating means 2.
In a sound effect adding device having a mixing means 4 for mixing the input sound signal and the sound effect controlled by the sound effect control means 3 and an output means 5 for outputting the mixed sound sound, a tone color is designated. The control unit 30 for selecting the control value determination method that is most suitable for the tone color designated by the control unit 30, and the control value determination method selected by the unit selection unit 31 Based on the control value of the sound effect controlling the means 3, the control value determining means 6 for determining the control value for controlling the sound signal output from the mixing means 4, and the control value determined by the control value determining means 6. And sound signal control means 7 for controlling the mixed sound signal output from the mixing means 4.

A second invention is the same as the first invention,
The control value determined by the control value determining means 6 is configured to be determined based on the reverb sound.

In a third aspect based on the first and second aspects, the control value determined by the control value determining means 6 is determined by referring to the control value determination table 17 selected by the means selecting section 30. Is composed of.

In a fourth aspect based on the first and second aspects, the control value determined by the control value determining means 6 is obtained from the function selected by the means selecting section 30.

[0014]

The sound effect adding apparatus of the present invention is applied to an electronic sound effect adding apparatus, and a plurality of control tables are prepared according to conditions such as each tone color and reverb type, and the tone color or reverb type is prepared. When is changed, the optimum control table is selected to determine the control value and control is performed.

Furthermore, when the sound effect is changed by operating the tone color or reverberation operator 30 during the performance, the volume feeling does not change before and after the sound effect is applied by the control of the electronic volume (2) 7, and the sense of incongruity is felt. It is possible to obtain a natural listening feeling.

Therefore, when the operator 30 is operated, the CP
In response to the instruction from U10, the means selecting unit 31 selects the optimum control method for controlling the acoustic effect of the timbre according to the set value of the operator 30.

At the same time, the CPU 10 reads the set value of the depth control unit 13 and controls the optimum control value according to the tone color designated by the operation of the operator and the volume designated by the set value of the depth control unit 13. The value determining means 17 determines to read.

Further, when the operator 30 is operated to give a sound effect during the performance, the control value determining means 6 determines an optimum correction value according to the output value of the sound effect outputted by the sound effect control means 3. The sound signal control means 7 controls the mixed sound signal based on the correction value.

As a result, during the performance, the optimum control method 17 corresponding to the tone color designated by the operator 30 is selected, and the sound signal control means 7 automatically selects the mixed sound signal according to the degree of the sound effect. Since the sound effect is controlled, the sound effect can be made variable, the optimum sound feeling can always be obtained, and a natural and uncomfortable sound can be obtained.

In a second aspect of the invention, the control value for controlling the mixed sound signal by the sound signal control means 7 in the first aspect of the invention is the amount of change in the reverb sound increased or decreased by the sound effect control means 3. It is decided based on.

As a result, the sound volume of the mixed sound signal of the original sound and the sound effect is controlled according to the amount of change of the sound effect controlled by the sound effect control means 3, so that there is no change in sound volume and a natural and comfortable reverberation effect. Sound is obtained.

In a third aspect based on the first or second aspect, the control value determined by the control value determining means 6 is determined by the control value stored in the ROM 11 based on the change in the volume of the original sound and the volume of the sound effect. It is determined by referring to the data in the table 17.

As a result, the sound effect adding apparatus according to the present invention can be realized with a slight improvement such as the modification of the program and the addition of the memory.

In a fourth aspect based on the first to third aspects, the control value determined by the control value determining means 6 is obtained by performing a function calculation based on the volume change of the original sound and the sound effect volume.

Therefore, the sound effect adding apparatus of the present invention can further reduce the memory as compared with the third invention, and the apparatus can be simplified and the cost can be reduced.

[0026]

Embodiments of the sound effect adding apparatus of the present invention will be described below. Before describing the overall structure, control of the acoustic effect of the present invention will be described.

FIG. 2 is a diagram for explaining control of the acoustic effect of the present invention. First, the control when a positive sound effect is applied to the original sound will be described with reference to this figure.

In the figure, (A) is a diagram showing the original sound and the magnitude of the effect sound generated by the effect component generator 2 based on the original sound. The original sound in this figure indicates the volume of the sound input to the input unit 1 in FIG.

The effect sound of FIG. 2 (A) indicates the magnitude of the effect sound generated by the effect component creating section 2 based on the original sound input to the input section 1.

The original sound of FIG. 2B is the original sound input from the input unit 1, and is the same as the original sound of FIG. On the other hand, the sound effect indicates the magnitude of the sound effect as a result of the electronic volume (1) controlling the sound effect generated by the effect component creating unit 2 based on the set value of the depth control 13.

Therefore, the magnitude of the original sound in FIG. 6B is the same as that in the initial state, but the sound effect is increased by the amount indicated by the increment. Therefore, in the method of simply adding the sound effect to the original sound as in the conventional reverberation adding device, the listener sounds as if the sound volume has increased, even though the original sound has the same sound volume.

Therefore, in the present invention, as shown in FIG. 6C, the mixed sound signal of the original sound and the sound effect is reduced at a constant rate so that a volume feeling close to that of the original sound can be obtained.

FIG. 6D is a diagram showing the initial state of the original sound when the sound effect is too loud compared to the original sound. When the effect sound is reduced as indicated by the decrement in FIG. 6E in order to correct such a state, the volume of the original sound is reduced in the conventional reverberation effect adding device even though the original sound has the same volume, contrary to the example of FIG. Feels like.

Therefore, according to the present invention, as illustrated in FIG. 6F, the original sound and the effect sound are modified at a constant rate to increase the original sound and the effect sound, and the same volume feeling as in the initial state is obtained. .

FIG. 3 is a diagram for explaining a control value determining procedure for performing the above control. The procedure for determining the control value will be described below with reference to FIGS. 3 and 2.

In FIG. 3, the vertical axis is the control value, that is, the control value controlled by the electronic volume (2) 7 in order to keep the volume feeling constant, and the horizontal axis is the set value of the depth, that is, the electronic volume (1 ) 3 indicates a control value for controlling the sound effect generated by the sound effect creating unit 2.

In the initial state of FIG. 2A, that is, assuming that the volume of the original sound input from the input unit 1 is A and the effect sound generated by the sound effect creating unit 2 based on the original sound is B, the initial state is shown. The volume is represented by A + B.

On the other hand, the electronic volume (1) of FIG. 2 (B)
In the state where the sound effect is controlled based on the depth value in 3, the size of the original sound is A, which is the same as in the initial state, but when the control value of the sound effect is μ, the sound effect is represented by B · μ. 2 (B)
The overall volume is A + μ · B.

Therefore, in order to keep the initial state and the sense of volume after effect sound control constant, let λ be the control coefficient for controlling the synthetic sound by the electronic volume (2) 7.

(A + B · μ) λ = A + B (1)

Electronic volume (2) obtained from equation (1)
The control value λ of 7 is It is represented by.

FIG. 3 is a graph showing the relationship between λ and μ with the value of λ in the equation (2) as the vertical axis and the value of μ as the horizontal axis.

As is apparent from the equation (2), when μ <1, the sound effect from the electronic volume (1) 3 decreases, so that λ> 1, and when μ> 1, the sound effect increases conversely. λ <1, and the control curve is represented by a downward-sloping curve where λ = 1 when μ = 1.

The above equation (2) is a basic equation, and the actual control curve may be determined by empirically arranging it according to the kind of tone color.

FIG. 4 is a control curve diagram for explaining an example in which the control curve for determining the control value of the electronic volume (2) 7 is changed according to the timbre according to the characteristics of each timbre.

As for the timbre, when the sound effect becomes larger or smaller than the original sound, for example, a piano, a trumpet, and a guitar, there are two kinds of sound colors, one in which the sound effect does not change easily and the other in which sound sound easily occurs.

When a control curve for determining the control value of the electronic volume (2) 7 is selected according to the characteristics of the timbre and the control value is determined, a harmony timbre corresponding to each timbre is obtained and the sound quality is improved. improves.

For example, for a trumpet, see FIG.
It is effective to use different control curves such that the piano uses the control curve of FIG. 4 (b) and the guitar uses the control curve of FIG. 4 (e).

When applying this control curve,
The control values of the electronic volume (2) 7 are determined by holding each curve illustrated in FIG. Alternatively, each of the curves may be held as a function in a program and the control value may be calculated.

FIG. 5 is a schematic block diagram for explaining the overall structure of the embodiment of the present invention. In the present embodiment, the case of controlling the depth as the control of the acoustic effect will be described as an example.

In the figure, reference numeral 1 denotes an input unit, and the input unit 1
An input sound signal is input through. The input sound signal that has been input is sent to the sound effect synthesis unit 4 and part of it is sent to the effect component creation unit 2.

The effect component producing section 2 produces an effect sound to be added based on the input sound signal sent from the input section 2, and sends it to the electronic volume (1) 3.

The electronic volume (1) 3 receives the sound signal sent from the effect component creating section 2 from the depth control section 13.
The sound effect is increased or decreased based on the depth value set in to control to a predetermined volume.

The sound effect synthesis unit 4 synthesizes the original sound sent from the input unit 1 and the sound effect controlled by the electronic volume (1) 3, and the sound effect is added to the original sound here. The sound effect synthesizer 4 is composed of, for example, an adder.

The electronic volume (2) 7 is for adjusting the volume difference caused by the increase and decrease of the effect sound generated by the effect component creating section 2 and the effect sound controlled by the electronic volume (1) 3. . That is, predetermined control is performed to increase or decrease the mixed sound signal sent from the sound effect synthesizer 4 based on the control value sent from the CPU 10.

The CPU 10 controls each section of the audio equipment according to a control program stored in the program memory section of the ROM 11.

The optimum control curve of the present invention is selected as follows.
Under the control of the CPU 10, the control curve selection unit 31 causes the operator 3
The control curve most suitable for the designated tone color is selected by the operation of 0.

In the control of the control value, the CPU 10 determines the control value for controlling the electronic volume (2) 7 based on the control value for controlling the electronic volume (1) 3 based on the set value of the depth control section 13. Then, the electronic volume (2) 7 is controlled by the control value to obtain a predetermined volume.

That is, the control value for controlling the mixed sound signal according to the control value of the electronic volume (1) 3 is read from the control value determination table 17 designated by the tone color stored in the ROM 11, and is read out electronically. It is sent to the volume (2) 7 to control the volume.

The ROM 11 stores various data such as tone color information in addition to the program for operating the CPU 10 described above. The control value determination table 17 for each tone color for determining the control value of the present invention is stored for each tone color in a predetermined area of the ROM 11.

The RAM 12 has a work area for the CPU 10,
Various registers, counters, flags, etc. for controlling the audio device are defined, a data area in which necessary data stored in the ROM 11 is transferred and stored, each switch of a panel unit (not shown), etc. The data necessary for sound emission corresponding to the set state is set.

The VRCTR buffer 18 for storing the control value of the electronic volume (2) directly related to the present invention, the NOW buffer 19 for storing the current depth setting value (for example, the reverb value), and the previous depth setting value. The OLD buffer 20 for storing the data is provided in the RAM 12.

The depth control 13 is for setting the degree of effect of the sound effect, and is provided on the panel, for example, and is set by the performer or listener before or during the performance.

The depth control 13 is composed of, for example, a wheel, a rotary volume, a slide volume or the like. The setting status of the volume is read by the CPU 10 and stored in a predetermined area on the RAM 12.

The operator 30 is used to specify a tone color such as a guitar or a piano, and is provided on a panel, for example, and is set by the performer or listener before or during the performance.

The operator 30 is, for example, a wheel,
Alternatively, it is constituted by a rotary switch, a slide switch, etc.
Is read by and stored in a predetermined area on the RAM 12.

The table selection section 31 selects the optimum control value determination table 17 to be used according to the tone color designated by the operation of the manipulator 30, and designates the table provided on the ROM 11. .

The A / D converter 14 uses the depth control 1
The analog signal sent from the converter 3 is converted into a digital signal, and the signal converted into the digital signal by the A / D converter 14 is sent to the CPU 10.

The D / A converter (1) 15 converts the control value of the electronic volume (1) 3 generated by the CPU 10 into an electronic volume (1) 3 based on the set value set in the depth control 13. It is something to send.

The D / A converter (2) 16 converts the control value to be controlled by the electronic volume (2) 7 read by the CPU 10 from the control value determination table 17 into an analog signal and sends it to the electronic volume (2) 7. It is a thing.

The output section 5 is composed of an amplifier, a speaker and the like (not shown), which converts and amplifies the mixed sound signal controlled by the electronic volume (2) 7 and outputs the sound.

FIG. 6 is a functional block diagram for explaining the operation for determining the control value of the electronic volume (2) 7, which is a feature of the present invention. The configuration and functions other than the control value determination unit 6 in this configuration diagram are the same as those described in FIG.

As shown in the figure, the control value determination unit 6 is composed of an OLD volume value storage unit 61 and a control value calculation unit 62.

The OLD volume value storage unit 61 is the RAM 1
2, the control value for controlling the electronic volume (1) 3 at the time of the previous sound generation, that is, the set value of the depth control 13 is stored.

At a predetermined sounding timing, the CPU 10 reads the current set value of the depth control 13 and compares the read set value with the OLD volume value stored in the OLD volume value storage section 61 to find a change. If it does not exist, the control of the electronic volume (2) 7 is not necessary, so the process stands by until the timing of the next sound generation.

On the other hand, the read depth control 13
If there is a change in the setting value of the OLD volume value and the OLD volume value stored in the OLD volume value storage unit 61, it indicates that the depth control 13 has been operated during that period.

Therefore, the CPU 10 determines the magnitude of the original sound and
The control value determination table 17 specified by the table selection unit 31 stored in the ROM 11 based on the amount of change in depth.
Is read to determine the control value of the electronic volume (2) 7.

The control value for controlling the electronic volume (2) 7 is determined by such a procedure.

Next, the current set value of the depth control 13 is stored in the OLD volume value storage unit 61 of the RAM 12, and the control value read from the control value determination table 17 is sent to the electronic volume (2) 7 to generate a mixed sound signal. To control.

Next, the operation for determining the control value of the present invention will be described with reference to the flowchart of FIG.

When the power is turned on, the depth value set in the depth control section 13 is read by the control of the CPU 10 and A / D converted by the A / D converter 14, and the read value is provided on the RAM 12. The stored OLD buffer 20 is stored (step S11).

Next, the set value of the manipulator 30, that is, the timbre designated by the manipulator 30, is checked, and the manipulator 30 is checked.
The set value of is stored in a predetermined area of the RAM 12.

Then, in the table selection section 31, the ROM 11
Check the curve selection table 21 that specifies the control value determination table 17 to be selected according to the tone color provided above,
The optimum table to be selected for determining the control value is designated according to the setting position of the operator 30.

Further, the control value corresponding to the depth stored in the OLD buffer 20 is read from the control value determination table 17 corresponding to the tone color stored in the ROM 11, and stored in the VRCTR buffer 18 on the RAM 12. (Step S12).

When the performance is started and a predetermined sounding timing is reached, it is first checked by the CPU 10 whether or not the operating element 30 has been operated (step S13). That is, the CPU 10 checks the current setting value of the operator 30 and compares it with the previous setting value of the operator 30 stored in a predetermined area on the RAM 12.

As a result of the comparison, if there is no change, the operation of the operator for changing the timbre has not been performed, so the process directly branches to step S15.

On the other hand, if there is a change, there is a change in the tone color setting. Therefore, the table selection section 31 determines the optimum control value determination table 17 to be used according to the read tone color (step S14) and is selected. R to the sound
It is stored in a predetermined area of the AM 12.

Next, the CPU 10 reads the set value of the depth control 13 and stores the set value digitally converted by the A / D converter 14 in the NOW buffer 19 (step S15). This is a process for checking the current depth setting value.

Then, it is checked whether or not the set value stored in the NOW buffer 19 and the set value stored in the OLD buffer 20 are equal (step S16). This is a process of checking whether the depth has been operated between the time of the previous sound generation and the time of this sound generation.

If the value stored in the NOW buffer 19 is equal to the value stored in the OLD buffer 20 in step S16, there is no change in the depth setting value, and the process branches to step S19.

On the other hand, if the value stored in the NOW buffer 19 and the value stored in the OLD buffer 20 are not equal to each other in step S16, there is a change in the depth setting value, and the process proceeds to step S17.

Then, based on the new tone color and / or depth setting value (value of NOW buffer 19), the ROM 1
1 to control value determination table 17 to NOW buffer 19
Read the control value according to the value of
The data is stored in the RCTR buffer 18 (step S17).

Then, the current buffer value stored in the NOW buffer 19 is stored in the OLD buffer 20,
The value of the OLD buffer 20 is updated (step S1
8).

Then, the current buffer value stored in the NOW buffer 19 is sent to the D / A converter (1) 15 (step S19), and the D / A converter (1) 15 converts the value into an electronic volume ( 1) Send to 3.

As a result, the electronic volume (1) 3 applies the effect corresponding to the set value of the depth to the sound effect sent from the effect component creating section 2 and sends it to the sound effect synthesizing section 4.

Meanwhile, at the same time, the CPU 10 causes the VRCTR
The control value stored in the buffer 18 is read out and the D / A
It is sent to the converter (2) 16 (step S20), and the D /
The signal analog-converted by the A converter (2) 16 is sent to the electronic volume (2) 7.

As a result, the electronic volume (2) 7 controls the mixed sound signal sent from the sound effect synthesizing section 4 to adjust the sound volume to the same level as the original sound.

Then, the process returns to step S13, waits until the next sounding timing, and when the predetermined sounding timing comes, the routine from step S13 is repeated.

As described above, according to the present invention, the volume is automatically adjusted by the electronic volume (2) 7 according to the degree of the depth applied to the electronic volume (1) 3, so that the effect is natural and comfortable. It is possible to add a change in sound.

In this embodiment, the control value determination unit 6 determines the control value by referring to the control value determination table 17 in the ROM 11, but the program stored in the ROM 11 is selected according to the tone color. If the table for designating the function to be controlled and the function for determining the control value for each tone color are stored and the control value is determined by the function, the processing is quick, and the memory is significantly reduced. It will be possible.

The sound effect adding device of the present invention can be applied to audio amplifiers, karaoke machines, car stereos, electronic musical instruments and the like.

[0102]

As described above in detail, the sound effect adding apparatus of the present invention determines the volume feeling of the mixed sound signal of the original sound and the sound effect according to the selected tone color and the degree of the controlled sound effect. Since it is automatically controlled, the characteristics of the timbre can be used to obtain a natural and comfortable sound effect.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of a sound effect adding device of the present invention.

FIG. 2 is a diagram illustrating acoustic effect control of the present invention.

FIG. 3 is a diagram illustrating a procedure for determining a control value for controlling a mixed sound signal according to the present invention.

FIG. 4 is a diagram illustrating an example of a control curve that is selectively used according to a tone color.

FIG. 5 is an overall configuration diagram of an embodiment of the present invention.

FIG. 6 is a diagram illustrating a function of each unit for setting a control value according to the present invention.

FIG. 7 is a flowchart illustrating an operation for setting a control value according to the present invention.

FIG. 8 is a diagram illustrating a configuration of a conventional acoustic effect adding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input part (input means) 2 Effect component creation part (effect component creation means) 3 Electronic volume (1) (Sound effect control means) 4 Sound effect synthesis part (mixing means) 5 Output part (output means) 6 Control value determination Part (control value determination means) 7 Electronic volume (2) (sound signal control means) 10 CPU 11 ROM 12 RAM 13 depth control 14 A / D converter 15 D / A converter (1) 16 D / A converter ( 2) 17 control value determination table 18 VRCTR buffer 19 NOW buffer 20 OLD buffer 30 operator 31 table selection unit (means selection unit) 61 OLD volume value storage unit 62 control value calculation unit

Claims (4)

[Claims] 1. An effect component creating means for creating a sound effect component based on an input sound signal input to an input means, and a sound effect control means for controlling an output value of the effect component created by the effect component creating means, In a sound effect adding device having a mixing means for mixing the input sound signal and the sound effect controlled by the sound effect control means, and an output means for outputting the mixed sound mixed by the mixing means, a tone color is designated. An operation element, a means selection section for selecting an optimum control method for controlling a sound effect according to a tone color designated by the operation element, and a control value determination method selected by the means selection section, Based on the control value of the controlled sound effect, control value determining means for determining a control value for controlling the mixed sound signal output by the mixing means, and based on the control value determined by the control value determining means, Sound effect adding apparatus characterized by having a sound signal control means for controlling an output by mixing sound signals of engagement means. 2. The sound effect adding apparatus according to claim 1, wherein the control value determined by the control value determining means is determined based on the amount of change in the reverb sound. 3. The sound effect adding apparatus according to claim 1, wherein the control value determined by the control value determining means is determined by referring to the control value determining table selected by the means selecting section. . 4. The sound effect adding apparatus according to claim 1, wherein the control value determined by the control value determining means is obtained from a function corresponding to each timbre.