JPH03139007A - Sound adjusting device - Google Patents

Abstract

PURPOSE:To attain the adjustment of sound quality while keeping desired sound field compensation even when added effect sound of the front channel differs from that of the rear channel by providing a sound quality adjustment means for frequency adjustment and an effect sound adding means to the audio signals of the front and rear channels individually. CONSTITUTION:A front channel signal of a left channel audio signal is subject to frequency characteristic adjustment by a front sound quality adjustment circuit 11 provided individually to the channel and an effect sound is added by an effect sound providing means such as individual front surround circuits 13 without giving effect onto the rear channel. The rear channel signal is processed by the individual circuit to the channel without giving effect on the rear channel and even when the effect sound added in the front and rear channels differs from each other while the desired sound field is kept, the sound quality is adjusted. Moreover, the right channel audio signal is similarly processed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio adjustment device for adjusting and outputting audio signals of front and rear channels.

BACKGROUND ART In conventional sound adjustment devices, even if the device has a plurality of channel outputs, sound quality adjustment is normally performed in common for all channels. Furthermore, some sound adjustment devices are capable of individually adjusting the sound quality of each of the left and right channel audio signals. By the way, there is an acoustic adjustment device that corrects a sound field by adding a sound effect signal to an audio signal in order to create a sense of presence in an acoustic space such as a concert hall or a theater at home or in a car. However, if the sound effects to be added to the front and rear channels are different, for example, if reflected sound is added to the front channel and reverberant sound is added to the output of the rear channel, adjusting the sound quality will change the level balance of the front and rear sound effects. There is a problem in that there are cases where the sound field changes and the desired sound field correction cannot be obtained.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a sound adjustment device capable of adjusting sound quality while maintaining desired sound field correction even when the sound effects added to the front and rear channels are different.

Structure of the Invention The sound adjustment device of the present invention outputs audio signals of front and rear channels, and includes sound quality adjustment means for adjusting the frequency characteristics of the audio signals and sound effect adding means for adding sound effect signals to the audio signals. The feature is that each rear channel is provided individually.

Effect of the Invention In the sound adjustment device according to the present invention, the sound quality adjustment of the front channel does not affect the frequency characteristics of the audio signal of the rear channel, and the sound quality adjustment of the rear channel does not affect the frequency characteristics of the audio signal of the front channel. do not have.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the sound adjustment device shown in FIG. 1, which is an embodiment of the present invention, left and right channel (Lah, RCh) audio signals are output from the audio signal [(not shown). The Leh audio signal is supplied to a front (front) sound quality adjustment circuit 11 and a rear (rear) sound quality adjustment circuit 12. A front surround circuit 13 serving as sound effect adding means is connected to the front sound quality adjustment circuit 11, and a rear surround circuit 14 is connected to the rear sound quality adjustment circuit 12. Similarly, the Rch audio signal is supplied to the front sound quality adjustment circuit 15 and the rear sound quality adjustment circuit 16. A front surround circuit 17 is connected to the front sound quality adjustment circuit 15, and a rear surround circuit 18 is connected to the rear sound quality adjustment circuit 16.

The tone quality adjustment circuits 11, 12, 15, and 16 are tone control circuits or graphicalizer circuits, and are known circuits consisting of resistors, capacitors, and variable resistors, and will not be described in detail. Front surround circuits 13 and 17
For example, as shown in FIG.
and ATT (attenuators) 25 to 28 and adders 29 and 30. The Lch audio signal is supplied from the front sound quality adjustment circuit 11 to the delay circuits 21 and 22. Front sound quality adjustment circuit 1 is included in delay circuits 23 and 24.
An Rch audio signal is supplied from No. 5. Adder 2
The Lch audio signal is directly supplied as a sound signal from the front sound quality adjustment circuit 11 to the delay circuit 2.
The delayed audio signal by delay circuit 24 is passed through ATT26, and the delayed audio signal by delay circuit 24 is passed through ATT28.
are respectively supplied as early reflection sound signals via the following. The adder 29 adds and outputs the three supplied audio signals, and the output signal becomes the output signal of the front surround circuit 13. Similarly, the Rch audio signal from the front sound quality adjustment circuit 15 is directly supplied to the adder 30 as a sound signal, and the delayed audio signal from the delay circuit 21 is supplied to the adder 30 via the ATT25, and the delayed audio signal from the delay circuit 23 is supplied to the ATT27. is supplied as an early reflection sound signal. The adder 30 adds and outputs the three supplied audio signals, and the output signal becomes the output signal of the front surround circuit 15.

For example, the rear surround circuit 14 receives Lah and Rch signals from the rear sound quality adjustment circuits 12 and 16 as shown in FIG.
a subtracter 31 for subtracting an audio signal of
, and an adder 33 that adds the reverberant sound signal from the delay circuit 32 to the Lch audio signal from the rear sound quality adjustment circuit 12. Ru. The rear surround circuit 18 is also configured similarly to the rear surround circuit 14.

In the sound adjustment device according to the present invention having such a configuration, the Lch audio signal from the audio signal source is individually subjected to sound quality adjustment in the front and rear sound quality adjustment circuits 11 and 12. The audio signal whose sound quality has been adjusted in the front sound quality adjustment circuit 11 is sent to the front surround circuit 13.
and an early reflection sound signal is added to the signal. Further, the audio signal whose sound quality has been adjusted in the rear sound quality adjustment circuit 12 is supplied to the rear surround circuit 14, and a reverberation sound signal is added thereto. Therefore, the sound quality adjustment by the front sound quality adjustment circuit 11 does not affect the Lch rear side audio signal, and the sound quality adjustment by the rear sound quality adjustment circuit 12 does not affect the Lch rear side audio signal.
It does not affect the front side audio signal. Similarly, the sound quality of the Rch audio signal from the audio signal source is individually adjusted in front and rear sound quality adjustment circuits 15 and 16. The audio signal whose sound quality has been adjusted in the front sound quality adjustment circuit] 5 is supplied to the front surround circuit 17, where an early reflection sound signal is added.

Further, the audio signal whose sound quality has been adjusted in the rear sound quality adjustment circuit 16 is supplied to the rear surround circuit 18, where a reverberation sound signal is added. Therefore, the sound quality adjustment by the front sound quality adjustment circuit 15 does not affect the rear side audio signal of Rch, and the sound quality adjustment by the rear sound quality adjustment circuit 16 does not affect the rear side audio signal of Rch.
The adjustment does not affect the audio signal on the front side of the Rch.

In addition, in the sound adjustment device of the present invention, Lch
The output signals from the front surround circuits 13 and 17 of Rcb and Rcb are further outputted to power amplifiers 45 and 46 via level adjustment circuits 41 and 42, respectively. Further, each output signal from the Lch and Rch rear surround circuits 14 and 18 is further outputted to power amplifiers 47 and 48 via level adjustment circuits 43 and 44. Level adjustment circuit 41
44 are volume adjustment circuits having a fader adjustment function.

Power amplifier 45.46 is front left and right speakers 51°52
The power amplifiers 47 and 48 drive the rear left and right speakers 53 and 54.

FIG. 4 shows another embodiment of the invention. In this sound adjustment device, an Lch audio signal from an audio signal source (not shown) is supplied to front and rear surround circuits 61 and 62. The output signal of the front surround circuit 61 is supplied to the front sound quality adjustment circuit 63, and the output signal of the rear surround circuit 62 is supplied to the rear sound quality adjustment circuit 64. That is, the difference from the apparatus shown in FIG. 1 is that the surround circuit is provided before the sound quality adjustment circuit. Although only the Lch is shown in FIG. 4, the same applies to the Rch.

FIG. 5 also shows another embodiment of the invention. In this sound adjustment device, Lch audio signals from an audio signal source (not shown) are supplied to front and rear surround circuits 71 and 72 and front and rear sound quality adjustment circuits 73 and 74. The respective output signals of the front surround circuit 71 and the front sound quality adjustment circuit 73 are added by an adder 75 and supplied as a front 8 signal to a front level adjustment circuit (not shown). The respective output signals of the rear surround circuit 72 and the rear sound quality adjustment circuit 74 are added by an adder 76 and supplied as a rear output to a rear level adjustment circuit (not shown). This device differs from the devices shown in FIGS. 1 and 4 in that the surround signals output from the front and rear surround circuits 71 and 72 are not subjected to sound quality adjustment. Although only the Lch is shown in FIG. 5, the same applies to the Rch.

In each of the embodiments described above, the sound quality adjustment circuit and the surround circuit are configured individually, but the present invention is not limited to this. Each sound quality adjustment circuit and the surround circuit can be formed according to a program using a DSP (digital signal processing device). You can also do that.

Effects of the Invention As described above, in the sound adjusting device of the present invention, the sound quality adjusting means for adjusting the frequency characteristics of the audio signal and the sound effect adding means for adding a sound effect signal to the audio signal are separately provided in the front and rear channels. Therefore, the sound quality adjustment of the front channel does not affect the frequency characteristics of the audio signal of the rear channel, and the sound quality adjustment of the rear channel does not affect the frequency characteristics of the audio signal of the front channel. Therefore, even when the sound effects added to the front and rear channels are different, the desired sound field correction can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a front surround circuit in the device shown in FIG. 1, and FIG. 3 is a block diagram showing a rear surround circuit in the device shown in FIG. 1. 4 and 5 are block diagrams showing other embodiments of the present invention, respectively. Explanation of symbols of main parts 11.12, 15, 16, 63, 64.7374...
Sound quality adjustment circuit, 13.14, 17, 18°61.62.
71.72...Surround circuit, 21 to 24.3
2...Delay circuit, 25 to 28...ATT, 29
, 30. 33... Adder, 31... Subtractor

Claims (1)

[Claims] A sound adjustment device for adjusting and outputting audio signals of front and rear channels, comprising a sound quality adjusting means for adjusting frequency characteristics of the audio signal and a sound effect adding means for adding a sound effect signal to the audio signals in the front and rear channels. A sound adjustment device characterized in that each device is provided individually.