JPH07121089B2 - Television receiver - Google Patents

Description

TECHNICAL FIELD The present invention relates to a television receiver for displaying information such as characters on a screen in synchronization with a sync signal of a video signal.

SUMMARY OF THE INVENTION The present invention is a television receiver configured to display other information such as characters on a screen in synchronism with a synchronizing signal of a video signal of a predetermined channel instead of a video signal of a predetermined channel. When the sync signal is not obtained from the specified channel, the channel is switched until the sync signal is obtained, and when the information display is completed, the channel is switched again to return to the specified channel. It is intended to prevent the image from being disturbed.

[Conventional technology]

Conventionally, character information such as a receiving channel and a calendar has been displayed on a screen of a television receiver in addition to a television broadcast receiving image. When displaying a broadcast image receiving state such as a receiving channel as the display information, the image is displayed in a superimposing manner on the received image. Therefore, it is only necessary to superimpose the character signal output from the display circuit on the video signal. By the way, when displaying a calendar or the like without receiving a television broadcast image, a synchronizing signal generator is provided in the television receiver and a synchronizing signal is obtained from the synchronizing signal generator. If this is not done, the synchronization signal cannot be obtained and the display image is disturbed by flowing up and down, making it very difficult to see.

However, the synchronization signal generator has a disadvantage that it requires expensive components such as an oscillator. For this reason, the present applicant has previously proposed a television receiver of this type that does not require a synchronizing signal generator (Japanese Patent Laid-Open No. 60-251783, etc.). In this television receiver, when displaying only character information, the video signal of the television broadcast is blanked, only the synchronizing signal is extracted from this video signal, and this synchronizing signal is used.

[Problems to be solved by the invention]

However, when the synchronizing signal is obtained from the video signal of the television broadcast as described above, the video signal cannot be obtained and the synchronizing signal cannot be taken out when there is no broadcast signal in the channel the tuner is selecting. .

The present invention has been made in view of the above problems, and an object of the present invention is to provide a television receiver of this type that can obtain a synchronization signal with a simple configuration regardless of the tuner selection state.

[Means for solving problems]

For example, as shown in FIG. 1, the television receiver of the present invention displays other information in synchronism with a synchronizing signal of a video signal of a predetermined channel instead of the video signal of a predetermined channel in the drawing. In a television receiver,
When the synchronization signal cannot be obtained from the predetermined channel, the channel is switched until the synchronization signal is obtained, and when the display of information is completed, the channel is switched again to return to the predetermined channel.

[Action]

According to the television receiver of the present invention, when displaying the information different from the video signal, when the synchronization signal cannot be obtained from the channel selected by the tuner due to the pause of broadcasting, a vacant channel, etc., another video is displayed. By switching to the channel where the signal can be obtained and displaying information in synchronization with the synchronization signal of the video signal of this channel, broadcasting can be performed on any channel with a simple configuration that does not require a synchronization signal generator. As far as possible, it is possible to prevent the image from being disturbed when displaying information.

〔Example〕

An embodiment of the television receiver of the present invention will be described below with reference to the accompanying drawings.

The television receiver of this example is constructed as shown in FIG. In FIG. 1, (1) indicates an antenna, and the broadcast wave obtained by this antenna (1) is tuned to a tuner circuit (2).
Supply to. The tuner circuit (2) demodulates a broadcast signal of a predetermined channel instructed by a microcomputer (13) described later, and the demodulated signal is imaged through an image intermediate frequency amplification circuit (3) and a video detection circuit (4). It is supplied to the amplifier circuit (5). Further, the video signal from another video deck or the like obtained at the external video input terminal (6) is also supplied to the video amplifier circuit (5). Then, a cathode ray tube (hereinafter referred to as a CRT) is passed from the image amplification circuit (5) through the deflection circuit (7).
The video signal is supplied to this CRT (8) while supplying the synchronization signal to the deflection yoke of (8) (8), and the video signal is the broadcast signal of the channel selected by the tuner circuit (2) in this CRT (8). Is played.

Further, the audio signal of the broadcast signal is supplied from the intermediate frequency amplifier circuit (3) to the speaker (12) via the audio intermediate frequency amplifier circuit (9), the demodulation circuit (10) and the audio amplifier circuit (11), and the speaker The voice is played at (12).

In the television receiver of this example, the tuner circuit (2) controls the channel selection by the microcomputer (13). This microcomputer (13) controls channel selection and display of characters, etc., and supplies remote control signals from the remote control signal transmitter (14) through the remote control signal light receiving section (15) or operates keys. The tuner circuit (2) receives a channel selection signal or a display circuit (17) in response to a key operation signal supplied from the section (16).
To supply a display control signal. This display circuit (17) is a circuit that outputs a pattern signal such as letters and numbers to be displayed by the supply of the display control signal to the CRT (8), and is a broadcast supplied from the video amplification circuit (5) to the CRT (8). Characters and the like are displayed on the screen of the CRT (8) by being superimposed on the video signal such as. In addition, the video blanking signal is supplied from the microcomputer (13) to the video amplifier circuit (5) at a predetermined time, and the video amplifier circuit (5) outputs the video blanking signal to the microcomputer (1).
The video signal sync signal is supplied to 3). By supplying the video blanking signal to the video amplifier circuit (5) in this way, the image reproduced on the CRT (8) becomes a single color non-display image using only the synchronizing signal of the video signal. In this state, by supplying a display control signal from the microcomputer (13) to the display circuit (17), for example, characters or characters are displayed on the display screen (8a) of the CRT (8) as shown in FIG.
Only information consisting of numbers etc. is displayed. The example shown in FIG. 2 is an example of a reservation display for automatically turning on / off the receiver and selecting a channel.

Next, an example of the operation of displaying only the information such as letters and numbers on the television receiver of this example will be described with reference to the flowchart of FIG. First, when the power of the receiver is turned on, the display of the reservation screen (the image as shown in FIG. 2) is turned off and the channel change flag is reset (the channel is set immediately before the power is turned off) as the initialization operation. When the remote control transmitter (14) or the key operation unit (16) is operated in this state, the microcomputer (13) performs a process according to this operation and supplies a control signal to each circuit. For example, when the channel selection key is operated, a channel selection signal is supplied from the microcomputer (13) to the tuner circuit (2) according to the operation to change the channel. Here, when a key operation for displaying the reservation screen is performed, a display control signal is supplied from the microcomputer (13) to the display circuit (17) to start displaying the reservation screen. At this time, it is better that there is no image of television broadcasting or the like in the background of the display information. Therefore, the video blanking signal is supplied from the microcomputer (13) to the video amplification circuit (5) to display the background as a monochromatic non-display image. To do. Here, when the microcomputer (13) detects by the synchronizing signal supplied from the video amplifier circuit (5) that the channel selected by the tuner circuit (2) at this time is being broadcast, there is a video signal. The tuner circuit (2) keeps the tuning of the channel of (1) to utilize the synchronizing signal of this video signal, and the reserved screen is reproduced in synchronization with this synchronizing signal.

In the case of this example, the tuner circuit (2) at this time
If you can't get a video signal because the channel you selected is not broadcasting, and you can't get a sync signal,
After the channel at this time is stored in the memory provided in the microcomputer (13) and the channel change flag is set, the tuner circuit (2) sends the tuning signal to the tuner circuit (2) until the channel becomes a broadcast channel where a video signal can be obtained. 13), and change the channel in order. In this way, by changing to another channel being broadcast, a synchronizing signal of the video signal is obtained, and the reservation screen is displayed using this synchronizing signal. Then, when the reservation screen is displayed by changing the channel in this way, if the end of the reservation screen display is instructed by a key operation, the channel change flag is reset and the microcomputer (1
The original channel stored in the memory of 3) is tuned to by the tuner circuit (2) and returned to the tuning state of the original channel.

If there is no channel being broadcast and no video signal is obtained even if the tuner circuit (2) is tuned to all channels, the channel flag is reset when the original channel is returned to Reservation screen is played back without any sync signal while maintaining synchronization.

As described above, the television receiver of this example is in the middle of another broadcasting when the synchronizing signal of the video signal cannot be obtained because the channel being selected by the tuner circuit (2) is not in broadcasting or is an empty channel. By switching to the channel No. 1 and obtaining the synchronizing signal from the video signal of the switched channel, the reserved display screen synchronized can be obtained except for some time zones such as midnight when there is no broadcasting. Further, even if the channel is switched during the display of the reservation display screen, the channel returns to the original state after the end of the display, so that the broadcast of the same channel as before the display can be viewed, and the channel to be viewed does not change without permission.

It should be noted that if the audio signal is muted when the reservation display screen is displayed, the viewer will never know that the channel has been switched. Further, in the above embodiment, when the video signal is not obtained, only the channel selected by the tuner circuit (2) is changed, but it may be switched to another video signal input terminal side, for example, as shown in FIG. The video amplifier circuit (5) may switch to the video signal obtained at the external video input terminal (6) when the video signal is not obtained from any channel from the tuner circuit (2) side. Furthermore, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

〔The invention's effect〕

In the television receiver of the present invention, when a synchronization signal cannot be obtained from the channel selected by the tuner when displaying information different from the video signal, the synchronization is performed by switching to a channel from which another synchronization signal is obtained. Since information is displayed using signals, good information can be displayed if the broadcast is on any channel without a sync signal generator, and good display can be achieved with a simple configuration and without image distortion. There is.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a television receiver of the present invention, FIG. 2 is a diagram showing an example of display information, and FIG. 3 is a flow chart for explaining the example of FIG. (2) is a tuner circuit, (8) is a cathode ray tube, (13) is a microcomputer, and (17) is a display circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihito Ichikawa 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (56) References JP-A-55-8189 (JP, A)

Claims (1)

[Claims] 1. A television receiver adapted to display other information on a screen in synchronism with a video signal of a predetermined channel instead of a video signal of the predetermined channel. A television receiver characterized in that when the synchronizing signal is not obtained from the above, the channel is switched until the synchronizing signal is obtained, and when the display of the information is finished, the channel is switched again to return to the predetermined channel.