JPH0683373A - Sound field controller - Google Patents

Abstract

PURPOSE:To provide the sound field controller which creates a desired sound field environment, and give a listener specific satisfaction and does not make the listener tired when listening to specific music in the sound field environment for a long period. CONSTITUTION:The sound field controller consists of an analog/digital converting means 2, a digital signal processing means 3 which adds an effect sound signal to a digital signal, a control means 4 which controls the digital signal processing means 3, and a digital/analog converting means 5 which converts the output of the digital signal processing means 3 into an analog signal; and the control means 4 has a control program which can vary the factor of the effect sound signal by using time as a function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field control device, and more particularly to a sound field control device capable of creating an artificial sound field environment that does not cause discomfort even after listening for a long time. .

[0002]

2. Description of the Related Art Conventionally, an analog audio signal that is input is digitally processed and converted into an analog audio signal that is output from an ordinary speaker, and a concert hall,
It gives the same sense of presence and spaciousness as it was actually played at a disco, open-air stadium, etc., and simulates the same feeling as in the actual performance venue in a closed room or cabin of a general household. Sound field control devices that are formed in a well-known manner are well known.

Such a sound field control device generally converts an input analog signal into a digital signal and adds a predetermined sound effect signal to the digital signal to generate a predetermined sound field environment. There is, as an example of the concrete device,
For example, a predetermined sound field is formed by synthesizing and mixing the initial reflection sound and / or the reverberation sound of the digital signal.

More specifically, for example, a multi-output delay means for generating a plurality of delayed digital signals, a digital signal attenuator for attenuating the digital signal from each delay means to an appropriate level, and an attenuated digital signal. In addition to giving individual frequency characteristics of various reflected sounds in the real acoustic space, a digital filter individually added respectively, a digital signal adder for adding the output of each digital filter, and the added digital And a digital / analog conversion means for converting a signal into an analog signal.

That is, in the conventional sound field control device, the digital signal processing means for generating a predetermined sound effect signal to generate a predetermined sound field environment is basically a specific frequency. It is configured by appropriately combining a filter, a delay unit, and an addition unit. FIG. 3 shows an example of the basic configuration of the above-mentioned effect sound signal generating circuit that is generally used in the past. FIG. 3A is an echo, FIG. 3B is fading, and FIG. 3C is flanging.
FIG. 3D shows an example of a stereo chorus, and FIG. 3E shows an example of a multi-tap delay. These basic circuits are appropriately combined to generate a predetermined sound field.

[0006] In this case, the artificially created special sound field environment has a predetermined sense of presence due to the sound field environment at an early stage when the listener starts listening to the music or the like. Although very satisfying to the mood, the sound field environment is artificially created by nature, and is never adapted to human physiological conditions. During the period, there was a problem that the listener became tired when listening to the music in the same sound field environment.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems in the prior art and to create a desired sound field environment to give a listener a predetermined satisfaction and at the same time for a long time. It is intended to provide a sound field control device that does not get tired even when listening to predetermined music in the sound field environment.

[0008]

In order to achieve the above-mentioned object, the present invention adopts the technical constitution as described below. That is, a means for converting an input analog signal into a digital signal, a digital signal processing means for adding a sound effect signal to the digital signal, a control means for controlling the digital signal processing means, and an output from the digital signal processing means. A sound field control device comprising a means for converting to an analog signal, wherein the control means is a sound field control device configured to change the factor of the sound effect signal as a function of time. is there.

[0009]

Since the sound field control device according to the present invention uses the above-mentioned technical configuration, for example, when starting to listen to a desired music in a desired sound field environment, The factor of the sound effect signal of the sound field environment is strengthened, and after making the listener strongly recognize the presence of the sound field environment, the factor of the sound effect signal is gradually changed.
By gradually weakening the strength of the factor of the sound effect signal, it is possible to reduce the artificial reverberation sound, the initial reflection sound, etc., which compose the sound field environment, so that the listener does not notice it. It is possible to prevent the listener from feeling tired even when the music is listened to in the sound field environment for a certain period of time.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of the sound field control device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a specific example of the sound field control apparatus according to the present invention. In the figure, an input analog signal IN
An analog / digital conversion means 2 for converting A1 into a digital signal D1, a digital signal processing means 3 for adding a sound effect signal to the digital signal D1, a control means 4 for controlling the digital signal processing means 3, the digital signal processing means Digital / converts output D2 from 3 into analog signal A2
The sound field control device 1 is composed of an analog conversion means 5 and the control means 4 is configured to have a control program capable of changing the factor of the sound effect signal as a function of time. A sound field control device 1 is shown.

In FIG. 1, 6 is an amplifying means for amplifying the analog signal A2 to a proper level, and 7 is a proper speaker. Further, an operation board 8 having appropriate operation keys is connected to the control means 4 according to the present invention, and a desired sound field environment is set, a sound effect signal is selected, or a sound effect signal is operated by an operator. It is possible to set or adjust the change function of the factor.

In the sound field control device according to the present invention, the sound effect signal used is, as described above, for the purpose of creating a predetermined sound field environment for a predetermined analog signal. With respect to the digital signal obtained by converting the input signal, at least either the initial reflection sound or the reverberation sound of the digital signal or both of them is synthesized by a specific processing circuit provided in the digital signal processing means, It is added to the input signal.

That is, in the sound field control device according to the present invention, the initial reflected sound and the reverberant sound are mixed with the input analog signal direct sound at an appropriate ratio and at an appropriate level. Then, for example, the sound field environment of the concert hall, the sound field environment of the live house, the disco sound field environment, the sound field environment of the open air stadium, or the sound field environment of the church is created, and the listener actually It makes it possible to listen with the same sense of presence and expanse as listening to the music actually played at each of the venues.

That is, in the sound field control apparatus according to the present invention, it is desirable that the sound field control apparatus has a plurality of kinds of sound field environment modes described above, and the listener can select a desired one from the sound field environment modes. You can listen by selecting the mode. The effect signal concerned is, in the digital signal processing means 3, one or a plurality of delay means 30 for giving a predetermined delay time to the input digital signal D1 as shown in FIG. It is generated by appropriately combining with the synthesizing means 33 that mixes the output from the delay means 30, and by changing the way of combining the means, the selection of the delay time, the selection of the filter frequency, etc. It is possible to set the sound field environment mode of.

Further, the factor of the sound effect signal in the present invention is at least one selected from the level of the initial reflection sound or reverberation sound, the initial reflection time of the initial reflection sound, the reverberation time of the reverberation sound, and the like. Is. In the present invention, as described above, when the listener selects a desired sound field environment mode and starts to listen to a predetermined music, the sound effect signal of the sound effect signal is changed. After increasing the factor, change the factor of the sound effect signal of the sound effect signal so that the sound effect signal gradually becomes weaker according to the elapsed time, and change between the sound field environment modes. Even if you continue to listen for a long time while maintaining a clear difference, you can reduce discomfort and eliminate fatigue.

That is, in the sound field control device according to the present invention, the factor of the sound effect signal is changed with the processing time. Specifically, for example, the initial reflected sound or the reverberant sound is Keep the level strong at first,
After that, the level is lowered with the passage of time, or either the reflection time of the initial reflection sound or the reverberation time of the reverberation sound or both of them are initially set to be long, and the time elapses. It may be something that is gradually shortened along with.

The rate of change in the factor of the sound effect signal may be uniform over time or may be uneven over time. So, for example,
If the elapsed time is not yet sufficient, the rate of decrease in the level of the factor of the sound effect signal is reduced, and if the time has elapsed considerably, the rate of decrease in the factor of the effect sound signal is increased. It can be set to.

In short, how the listener can enjoy the sound field environment within a range in which the level of the factor of the sound effect signal is not noticed is the basis of the software for performing the operation. That is, in the present invention, the factor of the sound effect signal is such that in the initial stage, the level is increased or the reflection time or reverberation time is lengthened, and with the passage of time, at any time interval, and It is desirable to be configured so that it can be changed with an arbitrary factor ratio.

The sound field environment mode is set by operating the operation keyboard shown in FIG. 1 and giving necessary information to the control means 4 composed of a microcomputer or the like under predetermined conditions. , Can be set appropriately. Next, in the sound field control device according to the present invention, an example of a calculation operation procedure in the case of setting a predetermined sound field environment and listening to a predetermined music will be described with reference to the flowchart shown in FIG.

That is, after the start, in step (1), the listener or the operator performs mode selection in order to set a desired sound field environment mode. If NO in step (1), the operation is returned and the mode selection operation is repeated. If YES in step (1), the initial data, which is stored in advance in the control means 4 and is necessary for setting the sound field environment mode, is transferred to the digital signal processing means 6. (Step (2)) Next, in Step (3), it is determined how many times the factor of the sound effect signal in the digital signal processing means 3 is to be changed, and how many times the changing operation is performed. Resets the counter that stores whether or not was executed.

Subsequently, in step (4), a predetermined timer starts the passage of time, and the time at the start of the passage of time is stored as T1. The specific example of the present invention shows an example in which the factor of the sound effect signal is changed at a predetermined time interval. Specifically, the factor level of the sound effect signal is changed every 30 seconds. This shows the case where the level is reduced by 3% from the previous level.

Therefore, in step (5), the current time is compared with the start time, and the difference is 3
It is judged whether or not there is 0 second or more, and if NO, the judgment is repeated, and if YES, the factor of the sound effect signal, for example, the sound effect of the previous sound effect signal is calculated in step (6). The value is changed so that it becomes smaller by 3% of the factor, the process proceeds to step (7), and the counter value is set to 1
Only step forward.

Then, in step (8), it is judged whether or not the counter value exceeds a predetermined value. That is, the present invention shows an example in which the factor reduction processing of the sound effect signal is divided into seven times and executed. Therefore, in step (8), the current count value of the counter is If it is YES, the operation is ended, but if NO, the process returns to step (4) and the above operations are repeated.

In the above-mentioned specific example, after all, in the selected sound field environment mode, the factor reduction process of the effect sound signal is executed by 3% every 30 seconds. In 210 seconds, the factor of the sound effect signal is reduced by 21%. The operation procedure, the operation level, and the like can be arbitrarily set and used, and can be realized by appropriately changing the conditions according to the desired sound field environment mode.

[0025]

Since the sound field control device according to the present invention employs the technical configuration as described above, the artificial reverberation that configures the sound field environment so that the listener cannot understand it. It is possible to obtain a sound field control device in which the sound, the initial reflected sound, and the like are weakened over time, and the listener does not feel fatigue even when the music is listened to in the sound field environment for a long time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a specific example of a sound field control device according to the present invention.

FIG. 2 is a flowchart showing a procedure for operating the sound field control device according to the present invention.

FIG. 3 is a block diagram showing a specific example of a sound effect signal generation circuit that constitutes the digital signal processing means according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sound field control device 2 ... Analog / digital conversion means 3 ... Digital signal processing means 4 ... Control means 5 ... Digital / analog conversion means 6 ... Amplification means 7 ... Speaker 8 ... Operation board

Claims (7)

[Claims] 1. A means for converting an input analog signal into a digital signal, a digital signal processing means for adding a sound effect signal to the digital signal, a control means for controlling the digital signal processing means, and a digital signal processing means. Is a sound field control device comprising means for converting the output of the above into an analog signal, wherein the control means is configured so that the factor of the sound effect signal can be changed as a function of time. Sound field control device. 2. The sound field control according to claim 1, wherein the sound effect signal is for adding at least one of an initial reflection sound and a reverberation sound to the input signal and adding the synthesized sound. apparatus. 3. The sound effect signal comprises one or a plurality of delay means for giving a predetermined delay time to the digital signal inputted by the digital signal processing means, and an output from each delay means. The sound field control device according to claim 2, wherein the sound field control device is generated by appropriately combining with mixing means for mixing. 4. The factor of the sound effect signal is at least one selected from a level of an initial reflected sound or a reverberant sound, an initial reflection time of the initial reflected sound, a reverberation time of the reverberant sound, and the like. The sound field control device according to claim 2. 5. The sound field control device according to claim 1, wherein the factor of the sound effect signal is changed with the processing time. 6. The factor of the sound effect signal is such that in the initial stage, the level is increased or the reflection time or reverberation time is lengthened, and with time, at any time interval and at any factor ratio. 6. The sound field control device according to claim 5, wherein the sound field control device is configured to be changed by. 7. The digital signal processing means has a selectable mode in which a plurality of types of sound field environments can be set by combining the sound effect signals. Sound field control device.