JPH06141393A - Acoustic reproduction device - Google Patents

Abstract

PURPOSE:To attain the simulation of a natural sound field by generating and reproducing a simulated reflection sound suitable for the characteristic of the actual reflecting sound even when a source signal is reproduced by increasing high frequency gain of the source signal while a sound field control function is in use with respect to the acoustic reproduction device to reproduce an audio signal by means of a speaker or the like. CONSTITUTION:The device is made up of a sound quality adjustment section A1 capable of outputting a source signal while the frequency component of the source signal is changed, a reverberation sound generating section A2 generating and outputting a reverberation sound of the source signal, an initial reflection sound generating section A3 generating and outputting an initial reflection sound of the source signal, a changeover means SW1 outputting by switching the source signal and an output S2 of the sound quality adjustment section A1 and outputting the selected signal, a changeover means SW2 switching the source signal S1, the output S2 of the sound quality adjustment section A1 and the reverberation sound S3 and outputting the switched sound, and a control means A4 controlling the changeover means SW1, SW2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing device for reproducing an audio signal with a speaker or the like.

[0002]

2. Description of the Related Art In the following description, the conversion of an audio signal into sound so that it can be heard by a listener is referred to as "reproduction" and the reproduced sound is referred to as "reproduction sound". A device that outputs an audio signal, such as a record player, a radio tuner, a CD player, and a cassette deck, is referred to as a “source signal output device”, and an audio signal output by the source signal output device is referred to as a “source signal”. The source signal may be an analog signal or a digital signal.

An apparatus for reproducing an audio signal generally has a function of adjusting the quality of reproduced sound. The sound quality of the reproduced sound can be adjusted by passing the source signal through a filter or the like. In the early days of sound quality adjustment, the audible frequency band was divided into low frequency band, mid frequency band, and high frequency band, and the gain of each was variable, but in recent years, the audible frequency band has been made even finer. For example, a graphic equalizer that can vary the gain by dividing into about 10 divisions is often used.

In addition to such a sound quality adjusting function, in recent years, a reproducing apparatus having a sound field control function for simulating a sound field has been put into practical use in order to give a listener a realistic sensation. The sound field control function simulates how sound is reflected in, for example, a concert hall or a disco hall.

The sound actually heard by a listener at a concert or the like is
With respect to the original sound emitted by the performer, there are a direct sound that reaches the listener without the original sound being reflected and a reflected sound that the original sound is reflected on the ceiling or a wall and reaches the listener. The reflected sound is generally further classified into an early reflected sound that reaches the listener with a relatively small number of reflections, and a reverberant sound that reflects a large number of times and arrives at the listener after a delayed delay. is there. One of the characteristics of these reflected sounds is that high frequencies are attenuated compared to the frequency components of the original sound.

In a reproducing apparatus having a sound field control function, generally, a source signal is used as an original sound, that is, a direct sound, various reflected sounds are calculated from the source signal, and the direct sound is output from a plurality of speakers arranged around a listener. By reproducing the reflected sound, the target sound field is simulated.

FIG. 4 is a block diagram of a conventional example of a sound reproducing apparatus having a sound quality adjusting function and a sound field controlling function. The source signal output device A41 is, for example, a record player, a radio tuner, a CD player, or the like. The graphic equalizer unit A42 adjusts the sound quality by changing the frequency component of the source signal output by the source signal output device A41.

The sound field control unit A43 uses the output of the graphic equalizer unit A42 as an original sound to generate an initial reflected sound and a reverberant sound. The reflected sound is appropriately distributed and mixed together with the output of the graphic equalizer unit A42 as the original sound, and the speakers SP41, SP42, S are arranged around the listener.
Reproduced from P43.

[0009]

Generally, the listener tends to increase the gain in the high frequency range by adjusting the sound quality when reproducing the source signal. On the other hand, the sound field control unit A43 generates a simulated reflected sound by using the output of the graphic equalizer unit A42 whose sound quality has been adjusted as the original sound. Therefore, when the listener operates the graphic equalizer unit A42 to increase the high frequency gain while using the sound field control function, a simulated reflected sound with many high frequency components is generated and reproduced. Become.

Since the reflected sound has many high frequency components, it does not match the characteristics of the actual reflected sound. When the listener operates the graphic equalizer unit A42 to use the sound field control function, if the frequency characteristic is not changed, a simulated reflected sound that matches the characteristic of the actual reflected sound can be generated and reproduced. . However, the listener's intention to raise the high frequency gain of the source signal for listening cannot be realized.

As described above, in the conventional art, when the listener increases the high frequency gain while the sound field control function is used, the high frequency component of the simulated reflected sound increases accordingly. There is a problem that it does not match the characteristics of the actual reflected sound.

The technical problem of the present invention is to pay attention to such a problem, and in the state where the sound field control function is used, even if reproduction is performed with the high frequency gain of the source signal increased by the listener's intention, The purpose of this is to generate and reproduce a simulated reflected sound that matches the characteristics of the actual reflected sound, thereby enabling a natural sound field simulation.

[0013]

FIG. 1 is a block diagram for explaining the operation principle of the sound reproducing apparatus of the present invention. The source signal S1 output by the source signal output device A5 is distributed to the sound quality adjustment unit A1, the reverberation sound generation unit A2, and the initial reflected sound generation unit A3. The source signal S1 is switched by the switching means SW1.
When it is switched to the 1a side, it is reproduced from the speaker SP1, and when the switching means SW2 is switched to the SW2a side, it is reproduced from the speaker SP2.

The sound quality adjusting section A1 inputs the source signal S1, changes the frequency component of the signal and outputs it. The output signal is reproduced from the speaker SP1 when the switching means SW1 is switched to the SW1b side, and is reproduced from the speaker SP2 when the switching means SW2 is switched to the SW2b side.

The reverberation sound generating section A2 generates and outputs a reverberation sound which is a part of the reflected sound, using the source signal S1 as an original sound. The output signal is reproduced from the speaker SP2 when the switching means SW2 is switched to the SW2c side. The initial reflected sound generation unit A3 uses the source signal S1 as the original sound,
The initial reflected sound that is a part of the reflected sound is generated and output. The output signal is reproduced from the speaker SP3. The switching state of the switching means SW1 and SW2 is controlled by the control means A4.

The "speaker" in this description is
Other sound reproducers that reproduce sound from audio signals, such as headphones, are also included.

[0017]

FIG. 2 shows the control operation of the control means A4 in the present invention. When the listener operates the operation panel unit A6 in FIG. 1 to turn off the sound field control, the control unit A4 changes the switching unit SW as shown in FIGS. 2B, 2D, and 2F.
1, SW2 is controlled. That is, if the sound quality adjustment on the front side is off, the control means A4 switches the switching means SW1 to S.
The speaker SP1 controls to the source signal S1.
Is played as is. When the sound quality adjustment on the front side is on, the control unit A4 controls the switching unit SW1 to the SW1b side, and the speaker SP1 reproduces the signal S2 whose sound quality is adjusted by the sound quality adjusting unit A1.

When the sound quality adjustment on the rear side is off, the control means A4 controls the switching means SW2 to the SW2a side, and the speaker SP2 reproduces the source signal S1 as it is.
If the sound quality adjustment on the rear side is on, the control unit A4 controls the switching unit SW2 to the SW2b side, and the speaker SP2.
Reproduces the signal S2 whose sound quality has been adjusted by the sound quality adjusting unit A1.

As shown in FIGS. 2 (b), 2 (d) and 2 (f), when the sound quality is adjusted with the sound field control turned off, the reproduction is performed as described above, and therefore, the same as in the conventional case. In the present invention, no problem occurs.

When the listener operates the operation panel section A6 to turn off the front and rear sound quality adjustments and turn on the sound field control, the control means A4 changes the switching means SW1, as shown in FIG. Control SW2. That is, the control means A4 controls the switching means SW1 to the SW1a side, and the speaker SP1
Reproduces the source signal S1 as it is. On the other hand, the control unit A4 controls the switching unit SW2 to the SW2c side, and the speaker SP2 causes the reverberation sound S generated by the reverberation sound generation unit A2.
Play 2.

As shown in FIG. 2 (a), when the sound field control is performed with the sound quality adjustment turned off, the reproduction is performed as described above, so that the same problem does not occur in the present invention as in the conventional case. .

When the listener operates the operation panel A6 to turn on the sound quality adjustment on the front side and turn on the sound field control,
The control means A4 controls the switching means SW1 and SW2 as shown in FIGS. That is, the control means A4
The switching means SW1 is controlled to the SW1b side, and the speaker SP is
1 reproduces the signal S2 whose sound quality is adjusted by the sound quality adjustment unit A1.

On the other hand, the control means A4 has a switching means SW2.
To the SW2c side, and the speaker SP2 reproduces the reverberation sound S3 generated by the reverberation sound generation unit A2. At this time, the reverberation sound generation unit A2 generates a reverberation sound by using the source signal S1 before the sound quality adjustment by the sound quality adjustment unit as the original sound.

Therefore, as shown in FIGS. 2C and 2E, when the sound quality adjustment is turned on and the sound field is controlled,
In the present invention in which the reproduction is performed as described above, even if the listener adjusts the sound quality to increase the high frequency gain, the high frequency component of the reflected sound does not increase.

[0025]

EXAMPLES Next, practical examples of how the sound reproducing device according to the present invention is embodied will be described. Figure 3
FIG. 3 is a block diagram showing an embodiment of the present invention. In this embodiment, the sound quality adjustment unit A1, the reverberation sound generation unit A2, and the initial reflected sound generation unit A3 of FIG. 1 are configured by digital circuits.
The respective units may be composed of analog circuits.

The DSP unit A31 calculates the sum of products (A × B +
DSP (Digital Si) that is an LSI that executes C) at high speed
gnal Processor), and the sound quality adjustment unit A1 in FIG.
It corresponds to the reverberation sound generation unit A2 and the early reflection sound generation unit A3.
The DSP unit A31 inputs a source signal of a digital signal and performs an arithmetic operation on the digital signal, thereby performing sound quality adjustment, reverberation sound generation, and initial reflection sound generation.

Further, the DSP unit A31 is replaced by the D / A conversion unit A3.
5, the switching means SW1 and SW2 of FIG. 1 are configured by selecting the data to be output to A36 and A37. The selection is controlled by a signal output from the output port of the microcomputer unit A32.

When a source signal reproducing device A38 which outputs an analog signal is connected to the present device, it is converted into a digital signal source signal through an A / D converter A34, and D
Input to SP section A31. The front speaker SP1 is
It is installed in front of the listener to directly reproduce sound, the rear speaker SP2 is installed behind the listener to reproduce reverberant sound, and the center speaker SP3 is installed in front of the listener for initial reflection. It is effective to play the sound.

Of course, the arrangement of the speakers is not limited to this because it depends on the taste of the listener. In addition, the DSP unit A31
It is also possible to output the direct sound, the reverberation sound, and the early reflection sound by appropriately mixing them.

In stereo reproduction, the speakers SP1, SP2, SP3 are each paired in the left and right directions.

[0031]

As described above, according to the present invention, since the reflected sound is generated by using the source signal before the sound quality adjustment as the original sound, the frequency characteristic of the reflected sound to be simulated is different from the conventional one. However, the sound quality adjustment no longer changes.

Therefore, according to the present invention, even if the listener increases the gain of the reproduced sound in the high frequency range while the sound field is being controlled,
The high frequency component of the reflected sound does not increase, and the reflected sound that always matches the characteristics of the actual reflected sound can be reproduced, making it possible to simulate a natural sound field.

[Brief description of drawings]

FIG. 1 is a basic principle diagram of the present invention.

FIG. 2 is a diagram showing a combination of switching control means of the present invention.

FIG. 3 is a block diagram showing an embodiment of the present invention.

FIG. 4 is a block diagram of a sound reproducing device of a conventional example.

[Explanation of symbols]

 A1 sound quality adjustment unit A2 reverberation sound generation unit A3 initial reflection sound generation unit A4 control means A5 source signal output device A6 operation panel SW1, SW2 switching means SP1, SP2, SP3 speaker

Claims (1)

[Claims] 1. A source signal output device (A5) for outputting an audio signal (S1) and speakers (SP1, SP2,
In the sound reproducing device which reproduces sound by connecting the signal processing device during SP3), the signal processing device inputs the source signal (S1) and changes the frequency component of the source signal (S1). Sound quality adjustment unit (A1)
And a reverberation sound generation unit (A2) that inputs and receives a source signal (S1) to generate and output a reverberation sound, and an initial reflection sound generation unit (A2) that inputs and outputs a source signal (S1) and generates and outputs an initial reflection sound. A3), a source signal (S1), and a switching means (SW1) for switching and outputting the sound quality adjusting section (A1) output (S2) under the control of the control means (A4), and a source signal (S1). S1), output of the sound quality adjustment unit (A1) (S
2) and the output (S3) of the reverberation sound generation unit (A2) under the control of the control unit (A4), the switching unit (SW2) for switching and outputting, and the two switching units (SW1, SW2). And a control means (A4) for controlling the above).