JPH02140084A - Satellite broadcast receiver - Google Patents

Abstract

PURPOSE:To annunciate it when a broadcast whose reproduction is disabled is received by annunciating the reception of a reproduction disabled radio wave on the condition that an intermediate frequency signal level is a prescribed value or over and the normal reproduction signal of video or audio signal is absent. CONSTITUTION:A conventional satellite broadcast reception circuit is provided with an annunciation circuit 7. There might be a case that a broadcast station of a channel selected by the 2nd converter circuit 2 makes any broadcast but it cannot be reproduced by a satellite broadcast receiver. In this case, a received carrier level is a prescribed level or over, since no control bit flag is set in a voice demodulation circuit 6, an output of a gate circuit 71 goes to an H level and an indicator 72 is lighted. The indicator 72 is lighted when the radio wave is received but cannot be reproduced. Thus, it is possible to recognize the reception of a broadcast unable to be reproduced by confirming the lighting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a satellite broadcast receiver capable of notifying that it is receiving a broadcast that cannot be reproduced.

[Conventional technology]

Satellite broadcasting is currently only a test broadcast in Japan, and 1
It is broadcast only on channels 1 and 15.

[Problem to be solved by the invention]

However, there are times when high-definition broadcasting is carried out on one of the 11 channels (for example, at night), and in this case, a normal satellite broadcast receiver cannot reproduce the high-definition broadcast even if it is received. A striped pattern is displayed as an image, and no sound is produced.

Therefore, some users may mistakenly believe that the satellite broadcasting receiver has malfunctioned, and some countermeasures have been required.

The present invention has been made in view of these points, and an object thereof is to provide a satellite broadcast receiver that can notify when a broadcast that cannot be reproduced is received.

[Means to solve the problem]

To this end, the present invention provides a notification that radio waves that cannot be reproduced are being received, provided that the level of the 21st F signal is above a predetermined value and there is no signal indicating normal reproduction of video or audio. .

〔Example〕

Examples of the present invention will be described below. FIG. 1 is a diagram showing a circuit of a satellite broadcasting receiver according to an embodiment. 1 is B
An input terminal to which the 11F signal (intermediate frequency signal) (UHF band) from the first converter of the S antenna is input; 2 is a second converter circuit that extracts a signal of a predetermined channel from the 11F signal; A channel frequency is selected by a tuning command from. 4 amplifies the second IF signal obtained by the second converter circuit 2 and
2nd IF-FM demodulation circuit that performs M demodulation, 5 is the 21st F-F
A video demodulation circuit inputs the signal from the M demodulation circuit 4 and demodulates the video signal, and 6 is an audio demodulation circuit that inputs the signal from the 21st F/FM demodulation circuit 4 and performs four-phase DPSK demodulation or PCM demodulation.

Now, in this embodiment, a notification circuit 7 is further provided in such a normal satellite broadcast receiving circuit. This notification circuit 7 is configured by a gate circuit 71 which inputs the 21F signal (DC reception carrier signal) from the second IP circuit 4 and a control bit flag from the audio demodulation circuit 6, and the output of the gate circuit 7I. It consists of an indicator 72 that lights up.

Therefore, if the broadcasting station of the channel selected by the second converter circuit 2 is broadcasting that can be received by the satellite broadcasting receiver, the received carrier level is at a predetermined level, and the audio demodulation circuit 6 Since the bit flag is set, the output of the gate circuit 71 becomes 'LJ level,
Indicator 72 does not light up.

On the other hand, if no broadcast is being performed on that channel, the received carrier level is below the predetermined value and the control bit flag of the audio demodulation circuit 6 is not set, so the output of the gate circuit 71 is still r L Became J level,
Similarly to the above, the indicator 72 does not light up.

However, if something is being broadcast on that channel, but it cannot be played on a satellite receiver,
Although the received carrier level becomes a predetermined level or higher, the control bit flag of the audio demodulation circuit 6 is not set, so the output of the gate circuit 71 becomes rHJ and the indicator 72 lights up.

In this way, when radio waves are being received but cannot be reproduced, the indicator 72 lights up, so by checking this, it is possible to know that a broadcast that cannot be reproduced is being received.

In addition to high-definition broadcasting, such broadcasting includes regular scrambled satellite broadcasting (an example from a foreign country).

Such scrambling is normally applied to video signals, so in such a case, it is sufficient to extract some signal corresponding to a flag from the video demodulation circuit and input it to the gate circuit 71 instead of the control bit flag.

Note that the indicator 72 of the notification circuit 7 can also be used as an already built-in indicator, and can be flashed or
Alternatively, the notification may be made by scanning.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to notify a broadcast that cannot be reproduced even if it is received, so it is possible to prevent a user from misunderstanding that the receiver is malfunctioning.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a satellite broadcast receiving circuit including a notification circuit according to an embodiment of the present invention. 7... Notification circuit, 71... Gate circuit, 72...
·indicator. Agent Patent Attorney Tsuneaki Nagao

Claims (1)

[Claims] (1) On the condition that the level of the second IF signal is above a predetermined value and there is no signal indicating normal reproduction of video or audio,
A satellite broadcasting receiver characterized in that it is configured to notify that it is receiving radio waves that cannot be reproduced.