JPH05153520A - Av amplifier - Google Patents

Abstract

PURPOSE:To extremely facilitate a switching operation when a surround system is utilized and a television receiver is singly utilized in the AV amplifier capable of constituting the surround system in combination with the television receiver. CONSTITUTION:When the surround system is utilized, the power switch 41 of the AV amplifier 4 is turned on. A changeover switch 50 is switched to the position of a center audio amplifier circuit 48, for example an audio signal fed from a VTR 5 is separated into a front audio signal, a rear audio signal and a center audio signal by a Dolby surround processor 45 and they are fed to a surrounding speaker via an output terminal 49. When the television receiver 1 is singly utilized, the power switch 41 of the AV amplifier 4 is turned off. Then the changeover switch 50 is switched to the position of a television audio input terminal 51 and the television audio signal processed by an amplifier circuit of the television receiver 1 is fed to the speakers 11A, 11B of the television receiver 1 via the AV amplifier 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AV amplifier capable of amplifying a video signal and an audio signal, and more specifically, it can form a surround system by connecting a television receiver or a television monitor and a plurality of speakers. AV amplifier.

[0002]

2. Description of the Related Art An AV (audio / video) amplifier is constructed so that it can simultaneously amplify and output a video signal and an audio signal. Some of such AV amplifiers are shown in FIG.
As shown in FIG. 1, the television receiver 1 and a plurality of speakers, that is, the front speakers 2A and 2B and the rear speaker 3
There is an AV amplifier 4 that can achieve a Dolby Pro Logic surround system by combining A and 3B.

In this surround system, a video signal output from, for example, a video tape recorder (VTR) 5 or a laser disk (LD) 6 is supplied to an AV amplifier 4
Amplification processing is performed on the TV receiver 1 and the resulting audio signal is displayed on the screen of the television receiver 1. At the same time, an audio signal relating to this video is amplified by the AV amplifier 4 and the surrounding speakers 2A to 3B and the speaker 11A equipped on the television receiver 1 are processed. , 11B, it is possible to improve the sense of presence when watching a movie or the like.

It is also possible to connect a compact disk (CD) 7 or a tape recorder (TR) 8 to the AV amplifier 4 and listen to only the sound in a surround system.

The surround system is a phase shift method for creating an indirect sound by shifting the phase shift of the difference signal of the original sound,
It is divided into a delay method that delays the difference signal of the original sound to produce an indirect sound.

The Dolby Pro Logic system described above is a delay type surround system, and the front speaker 2
In addition to the front sound supplied to A and 2B and the rear sound supplied to rear speakers 3A and 3B, a center sound peculiar to this method is output.

In this example, the speakers 11A and 11B provided in the television receiver 1 are also used as center speakers, and the center sound is supplied from the AV amplifier 4 to them.

That is, in the audio signal processing circuit of the AV amplifier 4, as shown in FIG. 5, when the power switch 41 is turned on, power is supplied from the power circuit 42 to each section. Then, the audio signals of various devices input from the audio input terminal 43 are selected by the selection switch 44, which is the front audio by the Dolby Surround Processor (DSP) 45.
The rear sound and the center sound are separated, and the front sound and the rear sound are separated into the L channel and the R channel, and the respective amplification circuits, that is, the front sound amplification circuits 46A, 46
B, rear audio amplification circuits 47A and 47B, and center audio amplification circuit 48.

These audio amplifier circuits 46A-48
Output from the speakers 2A to 11 via the output terminal 49.
B (FIG. 4).

When the speakers 11A and 11B of the television receiver 1 are also used as the center speakers as described above, the power source of the AV amplifier 4 is turned off and the audio selector switch 9 is switched to the television receiver 1 side.
The television sound output from the main body of the television receiver 1 can be supplied to the speakers 11A and 11B of the television receiver 1.

In the above-mentioned example, the case where the speakers 11A and 11B provided in the television receiver 1 are also used as the center speaker is shown, but as shown in FIG. 6, a speaker different from the television receiver 1 is used as the center speaker. 10A,
10B can also be connected.

In this case, the separately installed speakers 10A, 1
The center sound is supplied only to 0B, and the speakers 11A and 11B of the television receiver 1 are connected so that the television sound signal is supplied from the main body of the television receiver 1.

[0013]

As described above, the speakers 11A, 11 of the television receiver 1 are used as the center speakers.
When B is used (FIG. 4), when the surround system is used, that is, when the power of the AV amplifier 4 is on, the center sound output from the AV amplifier 4 is supplied to the speakers 11A and 11B of the television receiver 1. Thus, the changeover switch 9 must be set.

On the other hand, when only the television receiver 1 is used without using the surround system, that is, A
When the power of the V amplifier 4 is off, the television receiver 1
The audio selector switch 9 so that the audio signal is directly supplied from the television receiver 1 to the speakers 11A and 11B of the
Must be switched.

In this way, when the speakers 11A and 11B of the television receiver 1 are also used as the center speaker,
For switching between using the surround system and using only the television receiver 1, it is troublesome to operate the voice changeover switch 9 or the like.

When the speakers 10A and 10B different from the television receiver 1 are provided as the center speakers (FIG. 6)
In the case of using the surround system, the sound output from the speakers 11A and 11B of the television receiver 1 must be muted because it interferes with the use of the surround system.

On the other hand, when using only the television receiver 1, it is necessary to raise the volume of the sound output from the speakers 11A and 11B.

When the speakers 10A and 10B different from the television receiver 1 are provided as the center speakers in this manner, the television receiver is used for switching between the use of the surround system and the use of only the television receiver 1. The operation is troublesome because the volume of the device 1 must be adjusted.

Therefore, the present invention solves the above-mentioned problems, and when the surround system is constructed by combining the AV amplifier and the television receiver or the television monitor, The present invention proposes an AV amplifier capable of extremely simple switching operation when a television receiver or a television monitor is used alone.

[0020]

In order to solve the above problems, according to the present invention, in an AV amplifier capable of amplifying a video signal and an audio signal, a television audio signal amplified by a television receiver or a television monitor. A power source switch is provided with a switching means for interlocking with a TV audio input terminal for inputting a signal and a power switch of the AV amplifier main body and switching and outputting an audio signal processed by an amplifier circuit of the AV amplifier main body and a TV audio signal. When on, the audio signal processed by the amplifier circuit of the AV amplifier itself is output,
The feature is that the television audio signal is output when the power switch is off.

[0021]

In FIG. 2, when the surround system is used, the power switch 41 (FIG. 1) of the AV amplifier 4 is turned on. As a result, the changeover switch 50 is changed over to the center voice amplifier circuit 48 side.

Then, for example, the audio signal supplied from the VTR 5 is supplied to the Dolby surround processor 45 via the audio input terminal 43 and the selection switch 44, where the front audio L and R channels and the rear audio L and R channels are supplied. And center voice (L channel + R channel). Next, each voice is amplified by each of the amplifier circuits 46A to 46A.
Amplification processing is performed in 8 and it is supplied to the speakers 2A to 11B.

In this case, the video signal supplied from the VTR 5 is output processed by the AV amplifier 4 and supplied to the television receiver 1 to be displayed on the screen, and the sound related to this video is output to the surround system. Speaker 2
It is output from A to 11B.

When the television receiver 1 is used alone, the power switch 41 of the AV amplifier 4 is turned off.
As a result, the changeover switch 50 is changed over to the television audio input terminal 51 side.

Then, the television sound processed by the amplifier circuit of the television receiver 1 passes through the television sound input terminal 51, the changeover switch 50, and the output terminal 49, and then the television receiver 1
Are supplied to the speakers 11A and 11B of and output from here.

In this case, for example, the image received by the television receiver 1 is displayed on the screen, and the sound related thereto is output from the speakers 11A and 11B of the television receiver 1.

When speakers 10A and 10B different from the television receiver 1 are installed as center speakers (FIG. 3)
Is the output of the center audio amplifier circuit 48 or the TV sound supplied from the TV receiver 1.
It is supplied to A and 10B, and is otherwise the same as the above.

[0028]

Next, an embodiment of an AV amplifier according to the present invention will be described in detail with reference to the drawings. It should be noted that only the parts necessary for the description of the present invention are shown here, and the same parts as those described above are designated by the same reference numerals and detailed description thereof is omitted.

FIG. 1 shows the configuration of an AV amplifier 4 according to the present invention. In the figure, when the power switch 41 is turned on, power is supplied from the power circuit 42 to each part. The audio signal input from the audio input terminal 43 is output by the selection switch 4
4 to the Dolby Surround Processor 45.

The audio signal output and processed here is supplied to each of the amplifier circuits 46A to 48A. Then, the front voice and the rear voice are directly supplied to the output terminal 49.

The output of the center voice amplifier circuit 48 is supplied to the changeover switch 50. This changeover switch 50
Is the one that works with the power switch 41.
When 1 is on, it is set to the center audio amplifier circuit 48 side, and when the power switch 41 is off, it is switched to the television audio input terminal 51 side.

To the television audio input terminal 51, a television audio signal output processed by the television receiver 1 is input, as will be described later. This television audio signal is transmitted to the television receiver 1
The amplification circuit has already been subjected to amplification processing.

Therefore, when the power switch 41 is on, the center sound is output from the output terminal 49, and when the power switch 41 is off, the TV sound is output from the output terminal 49.

FIG. 2 shows an example of a surround system in which the above-described AV amplifier 4 and the television receiver 1 are combined, and shows a configuration in which the speakers 11A and 11B provided in the television receiver 1 are also used as center speakers.

When the surround system is used in the figure, the power switch 41 (FIG. 1) of the AV amplifier 4 is used.
Is turned on. With this, power is supplied to each part,
The changeover switch 50 is switched to the side of the center audio amplifier circuit 48.

Then, for example, the video signal supplied from the VTR 5 is supplied to the television receiving device 1 via the AV amplifier 4, and this is displayed on the screen. In addition, the audio signal supplied from the VTR 5 is transmitted to the AV amplifier 4 by the front audio L, R.
Channel, rear audio L and R channels, and center audio, which are separated from each other by the front speaker 2
A, 2B, rear speakers 3A, 3B, television receiver 1
Are supplied to and output from the speakers 11A and 11B.

As a result, the viewer listens to the sound through the surrounding speakers 2A to 11B while watching the image of the movie on the television receiver 1, and the sense of presence is improved.

Next, a case where only the television receiver 1 is used without using the surround system, as in the case of watching a news program, will be described.

In this case, the power switch 41 of the AV amplifier 4 is turned off. As a result, the changeover switch 50 is changed over to the television audio input terminal 51 side. Then, the TV sound amplified by the TV receiver 1 is supplied to the speakers 11A and 11B via the TV sound input terminal 51, the changeover switch 50 and the output terminal 49 and is output. At this time, the image received by the television receiver 1 is displayed on the screen.

In other words, if the AV amplifier 4 is used, when the surround system is used and when the television receiver 1 is used.
Only when the power switch 41 of the AV amplifier 4 is operated, switching can be performed when only the power is used.

In the above-described embodiment, the speaker 11 provided in the television receiver 1 as the center speaker.
Although the case of using A and 11B has been described, when the spies 10A and 10B different from the television receiver 1 are installed as the center speaker as shown in FIG. 3, the center sound is supplied to the speakers 10A and 10B. You can connect it like this.

In this case, although the television sound is output from the speakers 10A and 10B even when only the television receiving device 1 is used, in such a system, the television receiving device 1 is placed near the front center and near this. Since the center speaker, that is, the speakers 10A and 10B are usually placed, it does not feel unnatural.

[0043]

As described above, the present invention makes it possible to switch the output between the television audio signal amplified by the television receiver and the center audio signal processed by the amplifier circuit of the AV amplifier body, and The output is switched in conjunction with the power switch of the AV amplifier body.

Therefore, according to the present invention, when a surround system is constructed by combining an AV amplifier, a television receiver, and a plurality of speakers, the surround system can be used or the television receiver can be used by simply switching the power switch of the AV amplifier body. Since it can be switched to a single use, there is an effect that operability is extremely improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an audio signal processing circuit of an AV amplifier according to the present invention.

FIG. 2 is an explanatory diagram illustrating a first embodiment of a surround system in which an AV amplifier and a television receiver according to the present invention are combined.

FIG. 3 is an explanatory diagram illustrating a second embodiment of a surround system in which an AV amplifier and a television receiver according to the present invention are combined.

FIG. 4 is an explanatory diagram illustrating a first example of a surround system in which a conventional AV amplifier and a television receiver are combined.

FIG. 5 is a configuration diagram showing an audio signal processing circuit of an AV amplifier according to a conventional example.

FIG. 6 is an explanatory diagram illustrating a second example of a surround system in which a conventional AV amplifier and a television receiver are combined.

[Explanation of symbols]

 1 TV receiver 2A, 2B Front speaker 3A, 3B Rear speaker 4 AV amplifier 5 Video tape recorder 6 Laser disk 7 Compact disk 8 Tape recorder 9 Audio selector switch 10A, 10B speaker 11A, 11B Speaker of TV receiver 41 power switch 42 power circuit 43 audio input terminal 44 selection switch 45 Dolby surround processor 46A, 46B front audio amplification circuit 47A, 47B rear audio amplification circuit 48 center audio amplification circuit 49 output terminal 50 selector switch 51 TV audio input terminal

Claims (1)

[Claims] 1. An AV amplifier capable of amplifying a video signal and an audio signal, a television audio input terminal for inputting a television audio signal amplified by a television receiver or a television monitor, and a power switch of the AV amplifier body. In conjunction with the above AV
A switching means for switching and outputting the audio signal processed by the amplifier circuit of the amplifier body and the television audio signal is provided, and when the power switch is on, the audio signal processed by the amplifier circuit of the AV amplifier body is output. The AV amplifier is characterized in that the television audio signal is output when the power switch is off.