JPH0422277A - Television receiver - Google Patents

Abstract

PURPOSE:To realize a television receiver receiving a signal with less deterioration from an external device by providing an external input terminal separately from a receiver main body and providing an optical transmission means sending an optical signal between the external input terminal and the receiver main body. CONSTITUTION:A selection signal from a receiver main body is inputted to a digital-optical conversion circuit 15 via a cable terminal 16 of an external input terminal 2. A selection control circuit 18 outputs a selection signal to 1st, 2nd video input selection circuits 9, 11 and 2nd audio input selection circuits 12, 13 to throw the circuits to the position of the contact (a). As a result, a video signal received from a 1st input terminal 3 is inputted to an A/D converter circuit 14 via 1st amplifier circuit 6 1st video input selection circuit 9 Y/C separator circuit 10 2nd video input selection circuit 11 and an audio signal is inputted to the A/D converter circuit 14 via 1st amplifier circuit 6 1st audio input selection circuit 12 2nd audio input selection circuit 13 respectively and the result is sent in an optical signal to the receiver main body via digital-optical conversion circuit 15 optical cable terminal 16 with optical cable 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television receiver into which signals such as video are input from an external device through an external input terminal.

In recent years, television receivers have become larger with higher sound quality, higher picture quality, and larger screens so that you can enjoy powerful sound and images even at home. As a result, the viewing distance between the receiver and the viewer is becoming larger.

In addition, the number of external devices connected to such television receivers is increasing, and for example, not only video tape recorders, but also video disc players, video cameras, personal computers, and various other devices are now being connected. There is. Therefore, the receiver is equipped with an external input terminal to which a connection cord from an external device is connected, and the composite video signal or luminance/chroma (Y/C) transmitted from the external device is connected to the receiver.
Separated signals and the like are input in the form of analog signals.

By the way, with such a large television receiver, the external input terminal is on the receiver itself, and there is also a length restriction on the connection cord itself, so the placement of external devices is limited to the receiver. Therefore, for example, in the case of video tape recorders and video disc players, viewers who are located far away must go to the vicinity of the receiver when changing tapes or discs, which makes operation quite difficult. It was inconvenient.

Furthermore, since signals are transmitted from external equipment to the receiver using analog signals, signal deterioration occurs due to the influence of connection cords, resulting in deterioration of image and sound quality.

The present invention has been made in view of the above points, and provides a television receiver that improves the operability of external equipment connected to the receiver and allows transmission from the external equipment with less signal deterioration. The purpose is to provide a machine.

Steps to Solving Section In order to achieve the above object, the present invention provides a television receiver in which signals such as video are input from an external device through an external input terminal, in which the external input terminal is separated from the main body of the receiver. The receiver is provided with an optical transmission means for optically transmitting signals between the external input terminal and the receiver body.

With this configuration, it is possible to place the external equipment away from the receiver, that is, on the viewer's side where it is convenient for operation, and it is also possible to transmit the external equipment from the external equipment to the receiver with less signal deterioration. It becomes possible to do so.

1 piece An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, an external input terminal to which a connection cord from an external device is connected is provided separately from the receiver body, and an optical transmission means is provided for optically transmitting signals between the external input terminal and the receiver body. Figure 1 shows the receiver body (1
), and FIG. 2 shows an example of the block configuration on the side of the receiver main body (1). That is, (3) (4
) (5) is the first connection to which the connection cord from the external device is connected. Second. At the third input terminal, the first. Second input terminal (3)
(4) is a video input terminal (3a) (4a) into which a composite video signal from a video tape recorder is input, for example.
and audio input terminals (3b), (3c), (4b), and (4c) into which the left and right channel audio signals are input, respectively, and the third input terminal (5) is provided with audio input terminals (3b), (3c), (4b), and (4c) into which the left and right channel audio signals are input, and the third input terminal (5) is provided with an audio signal that is separated into a luminance signal and a chroma signal. Brightness and chroma input terminal (5
a) (5b) and audio input terminals (5C'') (5d) into which the left and right channel audio signals are input are provided respectively. (6) (7) (8) are the first, second and third channels. The first, second, and third amplifier circuits (9) that amplify the signals input to the three input terminals (3), (4), and (5) respectively are connected to either the first or second input terminals (3) (4). (10) is a Y/C separation circuit that separates the composite video signal selected by the first video input selection circuit (9) into a luminance signal and a chroma signal. circuit, (
11) is the Y/C separation circuit (10) or the third input terminal (
5) Luminance from either one.

a second video input selection circuit for selecting a chroma signal, (12)
is the first. Second or third input terminal (3) (4) (5
); (13) is a first audio input selection circuit for selecting a right channel audio signal from either one of the first . (14) is a second audio input selection circuit that selects a left channel audio signal from either the second or third input terminal (3), (4), or (5); Second video input selection circuit (9)
(11) and 1st. Second audio input selection circuit (12) (1
The analog-to-digital conversion circuit converts the video (brightness, chroma) and audio signals selected in step 3) into digital signals, respectively, and then performs parallel-to-serial conversion. Luminance and chroma input terminals (14a) and (14b) to which signals are respectively input;
．． Audio input terminal (14) into which the left and right channel audio signals from the second audio input selection circuit (12) (13) are respectively input.
c) (14d). (15) is a digital optical conversion circuit that converts the digital signal from the analog-to-digital conversion circuit (14) into an optical signal, or converts the command signal transmitted from the receiver body (1) side into a digital signal, and its output is transmitted from the optical cable terminal (16) to the receiver body (1) via the optical cable (17). and,
(18) receives a command signal from a selection command circuit (described later) and selects each video and audio input selection circuit (9), (11), and (12).
(13) is a selection control circuit which outputs a selection signal for selecting any one of the signals from each input terminal (3), (4), and (5).

Next, (19) in Fig. 2 is an optical cable terminal (20
) An optical-to-digital conversion circuit that converts an optical signal from the external input terminal (2) transmitted via an optical cable (17) into a digital signal, or converts a command signal from a selection command circuit described later into an optical signal. , (21) is a digital-to-analog conversion circuit that converts the digital signal from the optical-to-digital conversion circuit (19) from serial to parallel, separates it into audio, brightness, and chroma signals, and then converts it into an analog signal. Brightness and chroma output end (21a
) (21b), and audio output terminals (21c) (21d) for outputting left and right channel audio signals. (
22) is a receiving antenna for receiving television broadcasting; (23) is a channel selection/detection circuit that selects a receiving channel, detects it, and separates it into a composite video signal and an audio signal;
(24) is a Y/C separation circuit that separates the composite video signal from the channel selection/detection circuit (23) into luminance and chroma signals;
(25) is the receiving antenna (22) or external input terminal (
(2) is an input selection circuit that selects the luminance, chroma signal and left and right channel audio signals from either one of (2); (26) is the input selection circuit that amplifies and adjusts the luminance and chroma signals selected by the input selection circuit (25) and then converts them into three primary color signals; A video processing circuit demodulates and outputs it to the picture tube side, and (27) is an audio processing circuit that amplifies and adjusts the left and right channel audio signals selected by the input selection circuit (25) and then outputs them to the left and right speakers. And (2
For 8), select the signal from the receiving antenna (22), the external input terminal (2), or the Shirakawa input terminal (3) (4) (5) of the external input terminal (2). Selective command circuit (microcomputer) that outputs command signals to
(29) receives the command signal from the selection command circuit (28) and
A selection signal for selecting a signal from the receiving antenna (22) or a signal from the external input terminal (2) is output to the input selection circuit (25), and when the external input terminal (2) is selected, the first Second. This is a selection control circuit that outputs a command signal from a selection command circuit (28) instructing selection of any one of the third input terminals (3), (4), and (5) to the optical digital conversion circuit (19).

Therefore, for example, the first input terminal (3) of the external input terminal (2)
) is output from the selection command circuit (28), the selection control circuit (29) sends the input selection circuit (25) to select the signal from the external input terminal (2) side. A selection signal is output, and the input selection circuit (2
5), the switch section receives a selection signal from the selection control circuit (29) and is switched to the contact side for selecting the signal from the external input terminal (2) side.

Further, a command signal instructing selection of a signal from the first input terminal (3) is output from the selection control circuit (29) to the optical-to-digital conversion circuit (19); After the signal is converted into an optical signal, the optical cable terminal (
20) to the external input terminal (2) side via the optical cable (17), and is input to the digital-to-optical conversion circuit (15) via the cable terminal (16) on the external input terminal (2) side. After being converted into a digital signal by the digital-to-optical conversion circuit (15), it is output to the selection control circuit (18), and from the selection control circuit (18) the first . Second video input selection circuit (9) (11), 1st. A selection signal for selecting a signal from the first input terminal (3) is output to the second audio input selection circuit (12) (13), respectively, and the first and second video input selection circuits (9) (11), 1st. The switch section of the second audio input selection circuit (12) (13) is switched to the contact a side for selecting the signal from the first input terminal (3). As a result, the video signal input from the first input terminal (3) is transmitted from the first amplifier circuit (6) to the first video input selection circuit (9) to the Y/C separation circuit (10) to the second video input selection circuit. (11), the audio signal also passes through the first amplifier circuit (6) → the first amplifier circuit (6). Second audio input selection circuit (12) (13)
After being input to the analog-to-digital conversion circuit (14), the digital-to-optical conversion circuit (15) → the optical cable terminal (16) is connected to the optical cable (17) to the receiver body (
1) Light is transmitted to the side. Then, the optical cable terminal (20) on the receiver body (1) side → the optical digital conversion circuit (19)
→ Digital-to-analog conversion circuit (21) → Via the input selection circuit (25), the luminance and chroma video signals are output to the video processing circuit (26), the audio signal is output to the audio processing circuit (27), and the first input Image from terminal (3).

The audio signal will be reproduced by the picture tube and speaker.

In this embodiment, each input selection circuit (9) (11) (
12), (13), and (25) are configured to mechanically switch their switch sections upon receiving a selection signal, but they may also be switched electronically.

Matasato (2) 1. As mentioned above, according to the television receiver of the present invention, since the external input terminal is provided separately from the receiver body,
The operability of the external device can be improved by placing it near the viewer away from the receiver. Furthermore, in the present invention, the signal is transmitted from the external device to the receiver main body side by converting it into a digital signal and then using optical transmission, which causes less signal deterioration, so that deterioration in image quality and sound quality can be suppressed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the block configuration on the external input terminal side of the present invention, and FIG. 2 is a diagram showing an example of the block configuration on the receiver main body side. (1) - Receiver body, (2) - External input terminal. (3) (4) (5) -First. Second. Third input terminal. (15)---Digital-optical conversion circuit. (17) - Optical cable. (19) - 11 optical digital conversion circuit. (28) --- Selection command circuit. Applicant Sharp Corporation

Claims (1)

[Claims] (1) In a television receiver into which signals such as video are input from an external device through an external input terminal, the external input terminal is provided separately from the receiver body, and the external input terminal is provided separately from the receiver body. A television receiver characterized by being provided with an optical transmission means for optically transmitting a signal.