JPH053556A - Receiver - Google Patents

Abstract

PURPOSE:To tune a desired program from a channel number without the distortion of images by a user by tuning broadcasting signals continued while jumping broadcasting signals transmitted by a transmission system different from a prescribed transmission system when tuning the broadcasting signals. CONSTITUTION:A tuning part 2 tunes broadcasting signals S2 successively in a prescribed order while reacting the manipulation of a manipulator. A synchronizing signal judging circuit 5 and a line correlation judging circuit 6 detect the transmission system of the broadcasting signals S2 tuned by the tuning means 2, when the broadcasting signals S2 are transmitted in the transmission system different from the prescribed transmission system, control signals S6 and S1 are outputted, a broadcasting signal Vout is stopped being outputted, and the tuning means 2 tunes the broadcasting signals S2 following to the tuned broadcasting signals S2. When the signals are transmitted by the prescribed transmission system, the tuned broadcasting signals S2 are outputted as they are and, therefore, the danger of hardly observing pictures by the output of the broadcasting signals S2 in the transmission system different from the prescribed transmission system is effectively avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver, and is suitable for application to, for example, selecting a desired broadcast signal from a plurality of broadcast signals having different transmission systems.

[0002]

2. Description of the Related Art Conventionally, broadcast signals have been transmitted to each household as terrestrial broadcasting and satellite broadcasting so that various television broadcasting programs can be enjoyed at each household. Here, the satellite broadcasting is a so-called MUSE (multiple subnyquist sa) that has the same transmission method as that of the current terrestrial broadcasting by the NTSC system and a video signal band five times that of the NTSC system.
mpling encoding) method.

A terrestrial or satellite broadcast signal transmitted by the NTSC system is a broadcast signal having a field frequency of 59.94 [Hz] and 525 scanning lines per frame, and has a high correlation between the scanning lines. .. Also so-called MU
Unlike the broadcasting signal transmitted by the NTSC system, the satellite broadcasting transmitted by the SE system is a broadcasting signal having a field frequency of 60 [Hz] and 1125 scanning lines per frame, and is composed of the NTSC broadcasting signal and the synchronizing signal. The output timing and output waveform are different.

Further, in private satellite broadcasting, a break signal is provided in the middle of one scanning line so that only the subscriber can view the broadcast signal, and the broadcast signal is exchanged and transmitted in the first half and the second half, so-called scrambling. There is something to transmit.

[0005]

By the way, when a program to be watched is selected from broadcast signals in which various transmission systems are mixed as described above, for example, a channel assigned to each broadcast signal is up or down by a remote commander. A desired broadcast signal can be selected. However, even in the same channel, depending on the time of day, the so-called MUS
There is a case where a broadcast signal transmitted by the E transmission method or a so-called scrambled broadcast signal is transmitted, and at this time, an image may be disturbed.

Further, when the channel numbers to which the broadcast signals are assigned and the channel numbers to which the broadcast signals are not assigned are alternately arranged, the channel numbers to which the broadcast signals are not assigned are selected or the broadcast ends. Every time a channel number is selected, the image on the picture tube surface is disturbed. It is considered that the usability for the user will be further improved if it is possible to select and display only the channel number of the broadcast program in which the screen surface is not disturbed.

The present invention has been made in consideration of the above points, and an object thereof is to propose a receiving apparatus having excellent usability.

[0008]

In order to solve such a problem, according to the present invention, a tuning unit 2 and a tuning unit 2 that sequentially select the broadcast signal S2 in a predetermined order in response to the operation of an operator. Based on the detection means 5 and 6 for detecting the transmission method of the broadcast signal S2 selected in step 1, and the detection result of the detection means 5 and 6, when the transmission method is different from the predetermined transmission method, the channel selection means 2 is controlled. And a tuning control means 3 for outputting the signal S1 and tuning the broadcast signal S2 following the selected broadcast signal S2.

[0009]

The detecting means 5 and 6 detect the transmission system of the broadcast signal S2 selected by the channel selection means 2, and when the broadcast signal S2 is transmitted by a transmission system different from the predetermined transmission system, the control signals S6 and S1 is output, the output of the broadcast signal V _OUT is stopped, and the broadcast signal S2 following the broadcast signal S2 selected by the channel selection means 2 is selected. Further, in the case of transmission by a predetermined transmission method, it is possible to output the selected broadcast signal S2 as it is, so that it is possible to output a broadcast signal S2 of a transmission method different from the predetermined transmission method and to make the screen difficult to see. Can be avoided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a channel selecting apparatus as a whole, and among a plurality of received television broadcasting signals, a broadcasting of a channel number which does not give a normal image is interlacedly displayed. The channel selection unit 2 receives the channel up / down signal S input from the channel selection control circuit 3.
Based on 1, the channel numbers set in correspondence with the television broadcast signal are sequentially switched to N, N + 1 ... And UP or N, N-1. It is designed to do.

The channel selection section 2 outputs the television signal S3 of the channel number N selected by the channel selection control circuit 3 to the muting circuit 4, the synchronization signal determination circuit 5 and the line correlation determination circuit 6. .. The synchronization signal determination circuit 5 determines whether or not the television signal S3 input from the channel selection unit 2 matches the NTSC system synchronization signal, and N
When they do not match the TSC system sync signal, the mismatch output S4 output to the OR circuit 7 is raised to logic "H".

The line correlation judging circuit 6 is composed of a line memory and judges whether or not there is a correlation between vertically adjacent lines for one screen. Here, if there is no correlation between the upper and lower lines, the line correlation determination circuit 6 determines that the television correlation signal S3 is so-called scrambled transmission and the line correlation determination signal S5 is logically "H".
It is designed to be launched. The OR circuit 7 raises the muting signal S6 to the logic "H" when the mismatch output S4 or the line correlation judgment signal S5 input from the synchronization signal judgment circuit 5 and the line correlation judgment circuit 6 is the logic "H", and the muting circuit 4 and the tuning control circuit 3.

Here, the miuteing circuit 4 operates when the miuteing signal S6 is logic "L" (that is, NTSC).
(When receiving the television broadcasting signal of the system), the television signal S3 selected by the tuning unit 2 is converted into the video signal V.
_{When it} is output as _OUT and the muting signal S6 is logic "H" (that is, when a television signal transmitted by a so-called MUSE system or a television signal that is scrambled is selected), the television signal S3 The output is stopped and the television signal S3 is output to the picture tube so as not to disturb the screen.

Further, the channel selection control circuit 3 skips the channel number N currently selected by the channel selection unit 2 and skips the channel of the next channel number N + 1 or N-1 when the muting signal S6 is logic "H". A channel up / down signal S1 is output to the channel selection unit 2 so as to select the channel signal.

In the above configuration, which channel number of the currently-received television broadcast signal S2 is selected to be the channel number S3 of which channel is larger than the currently-selected channel number N. When the user outputs the channel up / down signal S1 so as to select the channel number N + 1, the channel selection device 1 determines whether the synchronization signal determination circuit 5 and the line correlation determination circuit 6 determine whether or not the television signal forms a normal screen. Discriminate in.

Here, when the television broadcast signal S2 of the channel number N selected by the channel selection section 2 is a broadcast signal transmitted by the NTSC system (that is, the scramble is not over, and the so-called MUSE system is not a satellite broadcast). (Or in the case of terrestrial broadcasting), the synchronization signal determination circuit 5 and the line correlation determination circuit 6 are set to
It is determined that the SC system is synchronized and the correlation between the upper and lower lines is maintained, and the television signal S3 is sent through the muting circuit 4 to the video signal V.
Output as _OUT .

Here, when the television broadcast signal is not allocated to the channel number N + 2 next to the current channel number N + 1, or when the transmission of the television broadcast signal by the NTSC system is completed, or so-called MU.
In case of SE transmission or scrambled transmission, when the channel selection section 2 selects the television broadcast signal of the channel number N + 2 by the user's designation, the synchronization signal determination circuit 5 detects the predetermined synchronization signal. If it is not performed, the muting signal S6 is output to the muting circuit 4 through the OR circuit 7 to control so that an image disturbing the screen is not displayed on the picture tube surface.

At this time, the channel selection device 1 outputs a monitoring signal S6 to the channel selection control circuit 3 and skips over the currently designated channel number N + 2 to move to the next channel number N.
The channel up / down signal S1 is output to the channel selection unit 2 so that the +3 television broadcasting signal S2 is selected.

The tuning unit 2 selects the television broadcasting signal corresponding to the channel number N + 3, outputs the television signal S3 to the muting circuit 4, and the synchronization signal judging circuit 5 and the line correlation judging circuit 6 It is again determined whether or not the broadcast has no screen. NT here
In the case of a broadcasting signal transmitted by the SC system, the channel selection device 1 outputs the video signal V _OUT to the picture tube through the muting circuit 4, and in the case of satellite broadcasting transmitted by the so-called MUSE system or scrambling. In the case of satellite broadcasting, the output of the video signal V _OUT from the muting circuit 4 is stopped.

As a result, the channel selection device 1 displays N on the picture tube surface.
NTS is excluded except for channel numbers corresponding to television broadcasting signals transmitted in a broadcasting format different from the TSC broadcasting system.
Only the video of the C broadcast system can be displayed, and the possibility that the screen is disturbed can be effectively avoided by outputting a television signal that does not form a normal video to the picture tube.

According to the above configuration, since the channel number of the television broadcast transmitted by the transmission system different from the broadcasting signal of the NTSC transmission system is skipped and is not displayed on the picture tube surface, the user can A desired program can be selected from a channel number that does not cause image distortion.

In the above embodiment, the case where the broadcasting channel other than the broadcasting signal transmitted by the NTSC broadcasting system is skipped to output the television signal is described. However, the present invention is not limited to this, and other broadcasting is possible. Method, eg PA
When the television broadcasting signal of the L broadcasting system can be received, the channel numbers other than the television broadcasting signal may be skipped and displayed.

Further, in the above-mentioned embodiment, the case where the large value is sequentially selected for the selected channel number has been described, but the present invention is not limited to this, and the case where the small value is sequentially selected for the selected channel number. It can also be widely applied to

Further, in the above-described embodiment, the case where the channel number of the broadcast signal of the satellite broadcast transmitted by the so-called MUSE transmission system or the scrambled transmission format is skipped, but the present invention is not limited to this. Alternatively, if a decoder is installed, viewing may be performed.

Further, in the above-described embodiment, the case of determining whether or not to output the video signal V _OUT based on the line correlation of the video signal has been described, but the present invention is not limited to this, and it is not limited to this. The output of the video signal V _OUT may be controlled based on this.

Further, in the above embodiment, the case where the broadcast signals are sequentially assigned to the channel numbers has been described, but the present invention is not limited to this, and the user presets a predetermined broadcast to a desired channel. It can also be applied when

Further, in the above-mentioned embodiment, the case has been described in which it is always determined whether or not the transmission format is different from the NTSC system. However, the present invention is not limited to this, and the broadcast format is different only when specified by the user. The signal may not be selected.

[0029]

As described above, according to the present invention, the transmission system of the broadcast signal selected by the selection unit is detected by the detection unit, and the selected broadcast signal is selected based on the detection result. Is transmitted by a transmission system different from the predetermined transmission system, the control signal is output to the channel selection means to select the broadcast signal subsequent to the selected broadcast signal, thereby Only the broadcast signal transmitted by can be displayed on the picture tube surface.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a receiving apparatus according to the present invention.

[Explanation of symbols]

1 ... tuning device, 2 ... tuning unit, 3 ... tuning control circuit,
4 ... Muteing circuit, 5 ... Synchronous signal judgment circuit,
6 ... Line correlation determination circuit.

Claims (1)

Claim: What is claimed is: 1. A channel selection means for sequentially selecting a broadcast signal in a predetermined order in response to an operation of an operator, and a transmission system of the broadcast signal selected by the channel selection means. When the transmission method is different from the predetermined transmission method based on the detection means for detecting, and the detection result of the detection means, a control signal is output to the channel selection means, and the selected broadcast signal is continued. A receiving device, comprising: a tuning control means for tuning the broadcast signal.