JPH04139687A - Vtr with built-in bs tuner - Google Patents

Abstract

PURPOSE:To prevent the deterioration of a sound quality by recording a sound signal in the form of a DPSK sound modulating signal. CONSTITUTION:When a signal outputted from a BS demodulating circuit 1 is selected by a selection circuit 4, a recording and reproducing part 5 records a BS video demodulating signal and the DPSK sound modulating signal. Then, the reproduced demodulating signal and modulating signal are inputted to a BS signal processing circuit 7, and the modulating signal is demodulated. At that time, a independent sound separation or a bilingual separation or the like is operated, a clock signal is outputted, and then a selection circuit 8 selects and outputs the output of the circuit 7. Thus, the deterioration of the sound quality is reduced, and the dependent sound is recorded so that it is selected at the time of reproduction.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a VTR (video tape recorder) with a built-in BS tuner (satellite broadcast reception tuner).

[Conventional technology]

This type of VTR uses B when recording the content of satellite broadcasts.
Not only the video signal of the channel received and selected by the S tuner, but also the audio signal is converted into a normal analog signal and then recorded.

[Problem to be solved by the invention]

Therefore, there is a problem in that the audio, which is sent as a digital signal and is originally of high quality, is severely degraded. Therefore, the present invention has been proposed to record audio signals in the format of DPSK audio modulation signals to prevent deterioration of audio quality.
The purpose is to provide a VTR with a built-in S tuner.

[Means to solve the problem]

For this purpose, the present invention provides a BS demodulation circuit that outputs a DPSK modulated audio signal and a demodulated video signal of a BS signal on the input side of the recording/playback section, and performs BS signal processing that performs DPSK audio demodulation on the output side of the recording/playback section. It was configured by providing a circuit.

【Example】

Examples of the present invention will be described below. FIG. 1 is a block diagram showing a schematic configuration of a VTR with a built-in BS tuner according to one embodiment. 1 is a BS demodulation circuit which outputs a demodulated video signal of a received BS broadcast and a DPSK audio modulation signal. As shown in Figure 2, the demodulated video signal has a band of 4.5MHz.
However, the DPSK audio demodulated signal is a digital signal with a carrier of 5.7272 MHz. 2 is a TV demodulation circuit, and the T received by the terrestrial antenna is
It demodulates the V broadcast signal and outputs an analog demodulated audio signal and a demodulated video signal. 3 is an external manual buffer, which outputs analog audio signals and analog video signals input from the outside. Reference numeral 4 denotes an input selection circuit, which selects one of the outputs of the BS demodulation circuit 1, TV demodulation circuit 2, and external manual buffer 3. This selection is performed based on an operation from an operation section (not shown). Reference numeral 5 denotes a recording/reproducing section, which records and reproduces the audio signal and video signal selected by the input selection circuit 4. Note that the audio signal is recorded using a deep recording method in which it is recorded below the video signal track. Reference numeral 6 denotes a normal signal processing circuit, which inputs normal signals, that is, analog signals of TV video/audio and analog signals of external input video/audio, and performs de-emphasis and other processing. Here, 7 is a BS signal processing circuit that also performs stereo processing and bilingual selection for audio.
The output signal of the demodulation circuit 1 is inputted via the switch 9, and the BS reproduction output signal from the recording/reproduction section 5 is inputted and processed. In particular, it includes a DPSK demodulation circuit that demodulates the DPSK audio modulation signal of the BS signal. Independent speech separation, bilingual separation, etc. are performed here. Reference numeral 8 denotes an output selection circuit, which selects the output of the BS signal processing circuit 7 when a lock signal is input from the BS signal processing circuit 7, and otherwise selects the output of the normal signal processing circuit 6. The lock signal is output when the BS signal processing circuit 7 locks to the carrier (5°7272MH2) of the BS audio. Now, in this embodiment, when the TV demodulation circuit 2 or the external manual buffer 3 is selected by the input selection circuit 4, they are recorded and reproduced in the recording and reproducing section 5 in exactly the same manner as before.
It is normally processed by the signal processing circuit 6 and then enters the output selection circuit 8. At this time, the lock signal is not output from the BS signal processing circuit 7, and the output selection circuit 8 selects and outputs the output of the normal signal processing circuit 6. On the other hand, BS? jj! When the input selection circuit 4 selects the signal output from the circuit 1, the recording/reproducing section 5 records the BS video demodulated signal and the BS DPSK audio modulated signal. and,
It is played in the same way. The reproduced video demodulation signal and DPSK audio modulation signal are BS
The signal is input to a signal processing circuit 7, where DPSK demodulation of the DPSK audio modulated signal is performed. At this time, independent speech separation, bilingual separation, etc. are performed as described above. Also, at this time, the lock signal is output, so the output selection circuit 8
selects and outputs the output of the BS audio processing circuit 7. In this way, in this embodiment, the BS audio signal is recorded as a DPSK modulated signal, so the independent audio signal is recorded as it is. Furthermore, since the recording is digital, deterioration in signal quality is extremely small and deterioration in sound quality can be prevented. Furthermore, since the output selection circuit uses the lock signal of the BS audio signal, automatic switching is possible. Note that if the switch 9 is turned on, the output of the BS demodulation circuit 1 is directly input to the BS signal processing circuit 7 for demodulation processing when the recording/reproducing section 5 is not operated. Also,
This BS signal processing circuit 7 outputs a video detection output and a pit stream output necessary for descrambling during paid satellite broadcasting. [Effects of the Invention] As described above, according to the present invention, since the BS audio signal is recorded as a DPSK modulated signal, there is little deterioration in audio quality as described above, and since independent audio can be recorded, it can be selected at the time of playback. It has the advantage of being able to

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a schematic configuration of a VTR with a built-in BS tuner according to the present invention, and FIG. 2 is a diagram showing frequency characteristics of a video signal and an audio signal when recording a BS signal. 1... BS demodulation circuit, 2... TV demodulation circuit, 3...
・External manual buffer, 4... Input selection circuit, 5...
Recording/reproducing section, 6... Normal signal processing circuit, 7... BS
Signal processing circuit, 8... Output selection circuit, 9... Switch.
Sochi. Agent Patent Attorney Tsuneaki Nagao Figure 1 ＼ Figure 2

Claims (1)

[Claims] (1) A BS demodulation circuit that outputs a DPSK modulated audio signal and a demodulated video signal of the BS signal is provided on the input side of the recording/playback section, and DPSK audio demodulation is performed on the output side of the recording/playback section.
A VTR with a built-in BS tuner characterized by being equipped with an S signal processing circuit.