JPH0468892A - Satellite broadcasting receiving equipment - Google Patents

Abstract

PURPOSE:To obtain the video signal and the voice signal of a ground broadcasting and a satellite broadcasting just selecting a station by switching automatically the descrambled video and voice signal corresponding to the state of a selecting means only when receiving the satellite broadcasting. CONSTITUTION:At the state of the power-on of an external input selecting switch 10, when a BS channel is selected and a BS receiving mode signal becomes a high level, changeover switches 15, 16 and 17 are automatically switched to external input terminals 13, 14L and 14R side, and the video signal and voice signal descrambled by an external descramber 18 are inputted in a recording part through an E-E circuit. On the other hand, when selecting the channel of the ground broadcasting such as a VHF broadcasting, the BS receiving mode signal becomes a low level, and the changeover switches 15, 16 and 17 are not switched to the external input terminals 13, 14L and 14R side regardless of the state of the external input selecting switch 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a VTR with a built-in BS (satellite broadcasting) tuner.
This technology relates to satellite broadcast receiving equipment such as video tape recorders (video tape recorders) and televisions (TVs).

[Conventional technology]

FIG. 2 is a schematic block diagram of a signal processing system in a VTR with a built-in BS tuner.

Satellite broadcasting received by external BS antenna 1 is
After being converted to F (intermediate frequency) signal, the VTR's BS
The signal is input to the tuner 2, and a desired BS channel is selected by operating the channel selection section 3. Then, the baseband signal is subjected to F'M (frequency modulation) demodulation, and is input to the buffer amplifier 4, the video signal processing section 5, and the demodulation section 6, respectively.

The output of the buffer amplifier 4 is connected to an external output terminal 11, and the Heas Hunt' signal is output as a detection output to an external descrambler 18? This is output. Further, the focused stream signal demodulated by the demodulating section 6 is inputted to a buffer amplifier 8 and an audio processing section 7, respectively, the output of the buffer amplifier 8 is connected to an external output terminal 12, and the focused stream signal is transmitted to the descrambler 18. is output to.

The output of the video signal reproduced from the baseband signal by the video signal processing section 5 is connected to the terminal 19a of the changeover switch 19. Furthermore, the outputs of the left and right audio signals reproduced by the audio processing section 7 are connected to a terminal 20a of a changeover switch 20 and a terminal 21a of a changeover switch 21, respectively.

On the other hand, the video signal and left and right audio signals descrambled by the descrambler 18 are sent to the external input terminals I3 and 14.
Terminal 19 of changeover switch 19 via L'14R
b, are connected to the terminal 20b of the changeover switch 20 and the terminal 21b of the changeover switch 21, respectively. Also,
Common terminal 19c of changeover switch 19-20-21
20cm21c is E-E (Electric t
o Electric) circuits (not shown) are connected to recording units (not shown).

In the above configuration, if the external descrambler 18 is connected as described above, the channel selection section 3 can be operated to select the desired BS channel, and the changeover switches 19, 20, and 21 can be set to external input mode. By switching to the terminals 19b, 20b, and 21b, scrambled BS can also be monitored or recorded by E-E.

[Problem to be solved by the invention]

However, in the conventional configuration described above, B, which is scrambled from terrestrial broadcasting channels such as VHF broadcasting,
If you change the channel selection to S channel or vice versa, press selector switch 19, 20, 2 each time.
1, which makes the operation complicated.

[Means to solve the problem]

In order to solve the above problems, the satellite broadcast receiving device of the present invention obtains video signals and audio signals by reproducing terrestrial broadcasts and unscrambled satellite broadcasts, while obtaining scrambled satellite broadcasts. In a satellite broadcast receiving device that outputs the baseband signal and pit stream signal from the external output terminal to an external descrambler for descramblement, and manually inputs the descrambled video signal and audio signal from the external input terminal, the above-mentioned selection means for selecting one of the video signal and audio signal and the descrambled video signal and audio signal; and selecting the descrambled video signal and audio signal, and receiving the satellite broadcasting. The device is characterized in that it is provided with a switching means for switching to input the descrambled video signal and audio signal from the external input terminal when the descrambled video signal and audio signal are inputted from the external input terminal.

[For production]

According to the above configuration, the selection means selects one of the video signal and audio signal and the descrambled video signal and audio signal, and selects the descrambled video signal and audio signal, and , a switching means for switching to input the descrambled video signal and audio signal from the external input terminal when receiving satellite broadcasting, so that only when receiving satellite broadcasting,
The video signal and audio signal and the descrambled video signal and audio signal can be automatically switched according to the state of the selection means.

[Embodiment] As an embodiment of the satellite broadcast receiving device of the present invention, a VTR with a built-in BS tuner will be cited and explained based on FIG. 1 as follows. Note that members having the same functions as those shown in the drawings of the conventional example are given the same reference numerals.

As shown in FIG. 1, the VTR of this embodiment has a BS-IF
A BS tuner 2 that extracts the baseband signal of a desired BS channel from the doubled signal, a channel selection section 3 that selects the desired BS channel, a buffer amplifier 4 that buffers and amplifies the baseband signal, and is connected to the output of the buffer amplifier 4, It is connected to an external output terminal 11 that outputs the baseband signal as a detection output, a demodulator 6 that demodulates the baseband signal and outputs a bitstream signal, a buffer amplifier 8 that buffers and amplifies the bitstream signal, and the output of the buffer amplifier 8. , an external output terminal 12 that outputs a bitstream signal, a video signal processing section 5 that reproduces a video signal from a baseband signal, an audio processing section 7 that reproduces an audio signal from a focus stream signal, and an external terminal that receives a video signal from the outside. Input terminal 13, external input terminal 14L to which left and right audio signals are input from the outside.14R1 external input terminals 13 and 14t.14. External input selection switch 10 (
selection means), when the external input selection switch lO is on,
Based on the BS reception mode signal that becomes high level only when receiving BS, the video signal from the video signal processing section 5, the left and right audio signals from the audio processing section 7, the video signal from the external input terminal 13, and the external input terminal 14L ・14. The left and right external audio signals from
It mainly consists of changeover switches 15, 16, and 17 (switching means) for outputting to.

Note that one contact of the external input selection switch 10 has B
S reception mode signal is input. Further, the video signal from the video signal processing section 5 and the left and right audio signals from the audio processing section 7 are transmitted to the terminals 15 of the changeover switches 15, 16, and 17.
a-16a-17a, respectively, and receives an external video signal from external input terminal 13 and external input terminal 14L.
・The left and right external audio signals from 1411 are connected to terminals 15b, 16b, and 17 of selector switches 15, 16, and 17.
b, respectively. Further, common terminals 15c16C and 17c of the changeover switches 15, 16, and 17 are connected to the recording section via an E-E circuit.

In the above configuration, after the BS received by the external BS antenna 1 is converted into a B51F signal, the BS of the VTR is
The signal is input to tuner 2. Then, the signal of the BS channel selected by the channel selection section 3 is subjected to FM demodulation, and a base station signal is extracted and inputted to the buffer amplifier 4, the video signal processing section 5, and the demodulation section 6, respectively.

The baseband signal buffered and amplified by the buffer amplifier 4 is outputted from an external output terminal 11 as a detection output. Further, the bit stream signal demodulated by the demodulation unit 6 is input to a buffer amplifier 8 and an audio processing unit 7, respectively.
The bit stream signal buffered and amplified by the buffer amplifier 8 is output from the external output terminal 12.

In the video signal processing section 5, the video signal is separated from the baseband signal by an LPF (low pass filter), and then a video signal is obtained by de-emphasis. Then, video amplification is performed. Also, in the audio processing section 7, P
CM (Pulse Code Modulation
) After demodulation, D/A (digital/analog)
The conversion yields left and right audio signals.

Monitor scrambled BS,
When recording, the detection output and bitstream signal are sent to an external descrambler 18 from external output terminals 11 and 12.
and output the descrambled video and audio signals to external input terminals 13, 14. - Input from 14R.

External input terminals 13 and 14. Whether or not to select the video signal and audio signal input from -141 is set by the state of the external input selection switch 10. That is, when the external input selection switch 10 is turned on and the BS channel is selected and the BS reception mode signal becomes high level, the changeover switches 15, 16, and 17 are set to the external input terminals 13, 14, and 14R. The video signal and the audio signal, which are automatically switched and descrambled by an external descrambler 18, are input to the recording section via the E-E circuit. On the other hand, when a terrestrial broadcasting channel such as VHF broadcasting is selected, the BS reception mode signal becomes low level, so regardless of the state of the external input selection switch 10,
Changeover switches 15, 16, and 17 are external input terminals 13
・Cannot switch to 14m/14R side. Therefore, V
Terrestrial broadcast video and audio signals (V
Switches for switching video and audio signals of terrestrial broadcasting such as HF/UHF broadcasting (not shown) are input to the recording section via the E-2 circuit.

As described above, in this embodiment, the external input selection switch 1
If you turn on 0, just by selecting the channel,
The changeover switches 15, 16, and 17 are automatically switched, and terrestrial broadcasting or scrambled BS can be monitored and recorded by E-E. In addition, if the external input selection switch 10 is turned off, channel selection allows you to receive terrestrial broadcasting or unscrambled BS as usual.
It can be monitored and recorded by E. In this way, regardless of whether the satellite broadcast is scrambled or not, you can enjoy both terrestrial and satellite broadcasts just by selecting the channel.

In the above embodiment, by manually operating the external input selection switch 10, the external input terminals 13, 14.・14
6, but the external input terminals 13 and 14L14 can be selected from the external descrambler 18.
External input terminal 1 when used as a dedicated input terminal from
3.14, ・14. By using a terminal with a switch, such as a jack with a switch, and using this switch as the external input selection switch 10, when the output lug of the descrambler 18 is inserted into the jack with a switch, the descrambler is automatically descrambled. The full video signal and audio signal can be selected, which is more convenient.

Note that as the changeover switches 15, 16, and 17, for example, relays or semiconductor switches can be used, but
The specific form is not important.

In addition, in the above embodiment, a VTR with a built-in BS tuner
Although the explanation has been given above, it can also be applied to a TV with a built-in BS tuner.

〔Effect of the invention〕

As described above, the satellite broadcast receiving device of the present invention includes a selection means for selecting one of a video signal, an audio signal, and a descrambled video signal and an audio signal, and a selection means for selecting either one of a video signal and an audio signal, and a selection means for selecting one of a descrambled video signal and an audio signal. and a switching means for manually switching the descrambled video signal and audio signal from the external input terminal when the satellite broadcasting is being received. Only then can the video signal and audio signal and the descrambled video signal and audio signal be automatically switched depending on the state of the selection means. Thereby, regardless of whether the satellite broadcast is scrambled or not, it is possible to obtain video and audio signals of terrestrial broadcasting such as VHF broadcasting and satellite broadcasting by simply selecting a channel.

1 is a schematic block diagram of a signal processing system of a VTR with a built-in DVD player.

2 is a BS tuner, 3 is a channel selection section, 5 is a video signal processing section, 6 is a demodulation section, 7 is an audio processing section, 10 is an external input selection switch (selection means), 11-12 are external output terminals, 13 and 14L・14R is external input terminal, 15
・16 and 17 are changeover switches (switching means).

Patent applicant Sharp Corporation

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and is a schematic block diagram of a signal processing system of a VTR with a built-in BS tuner.

Claims (1)

[Claims] 1. While terrestrial broadcasting and unscrambled satellite broadcasting are reproduced to obtain video and audio signals, scrambled satellite broadcasting baseband signals and bitstream signals are reproduced externally. In a satellite broadcast receiving device that outputs to an external descrambler from an output terminal and descrambles it, and inputs the descrambled video signal and audio signal from an external input terminal, the above-mentioned video signal and audio signal and the above-mentioned descrambled video are input. a selection means for selecting one of the signal and the audio signal; and a descrambled video signal and the audio signal when the descrambled video signal and the audio signal are selected and the satellite broadcasting is being received. 1. A satellite broadcast receiving device, comprising: a switching means for switching to input from an external input terminal.