JPH0369085A - Pcm video recorder built-in satellite broadcast receiver - Google Patents

Abstract

PURPOSE:To decrease the number of parts and to reduce a mounting space by switching PCM sound signals to be outputted from a satellite broadcast reception part and a VTR sound reproducing part by a switching means and executing D/A conversion by the same D/A converter. CONSTITUTION:When satellite broadcasting is received, an output terminal 3c of a changeover switch 3 is switched to a terminal 3b. A satellite broadcasting signal received in an antenna 17 of a satellite broadcast reception part 1 is passed through a tuner circuit 5, FM demodulation circuit 6, BPF 7, QPSK demodulation circuit 8, PCM processor 9 and the switch 3, and a sound signal is outputted from a sound output circuit 16 through a D/A converter 14 and an LPF 15. On the other hand, when the PCM sound signal of a magnetic tape 19 is reproduced, the terminal 3c of the switch 3 is changed over to a terminal 3a. The PCM sound signal detected by a magnetic head 19 is passed through a preamplifier 11, processor 12 and switch 3 and goes through the D/A converter 14 and LPF 15. Then, a sound is outputted from the output circuit 16.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a PCM video tape recorder (hereinafter referred to as VTR) with a built-in satellite broadcast receiver that has a satellite broadcast reception function and can record and play back PCM signals. It is something.

[Conventional technology]

Conventional VTRs have a satellite broadcast reception function and a PC
There are devices that can record and reproduce M signals. V like this
In TR, the satellite broadcasting PC obtained from the satellite broadcasting receiving unit
The M audio signal is converted to an analog audio signal by a D/A converter to obtain an audio playback output, and the PCM audio signal on the magnetic tape obtained from the VTR audio playback section is converted to an analog audio signal by a D/A converter.
The A converter converts the signal into an analog audio signal to obtain an audio reproduction output. In this type of conventional VTR, the above-mentioned D/A converters are provided independently for reproduction of satellite broadcasting and for reproduction of magnetic tape.

[Problem to be solved by the invention]

However, in the above-mentioned conventional configuration, since two identical D/A converters are provided, one for reproducing satellite broadcasts and the other for reproducing magnetic tape, this results in an increase in the number of components and an increase in component mounting space. This has the problem of increasing manufacturing costs.

[Means to solve the problem]

In order to solve the above problems, the PCM/VTR with a built-in satellite broadcasting receiver of the present invention has a satellite broadcasting receiving section that receives satellite broadcasting and outputs a P-CM audio signal, and a PCM/VTR that is recorded on a magnetic tape. VTR that extracts and outputs audio signals
These satellite broadcast receiving units or V
In a PCM-VTR with a built-in satellite broadcasting receiver that obtains audio output from a PCM audio signal obtained from a TR audio playback section,
PCM audio signal output from satellite broadcast receiver and VTR
A common D/A converter that converts the PCM audio signal output from the audio playback section into an analog audio signal, and a common D/A converter that converts the PCM audio signal output from the satellite broadcast reception section and the PCM audio signal output from the VTR audio playback section. Switch to D/
It is characterized by comprising a switching means for inputting the input to the A converter.

[For production]

According to the above configuration, P output from the satellite broadcast receiving section
CM audio signal and PCM output from the VTR audio playback section
The audio signal can be D/A converted by the same D/A converter by the switching operation by the switching means. This allows D/A conversion of PCM audio signals.
Only one /A converter is required, reducing the number of parts and the mounting space accordingly.

〔Example〕

An embodiment of the present invention will be described below based on FIG.

The RPCM/VTR in a satellite broadcasting receiver according to the present invention, as shown in FIG. We are prepared.

The above-mentioned satellite broadcast receiving unit l includes a satellite broadcast tuner circuit 5 that tunes and amplifies the satellite broadcast received by the antenna 17, an FM demodulation circuit 6 that demodulates the FM signal output from the satellite broadcast tuner circuit 5, and an FM demodulation circuit. QPSK (Quad Phase 5hif
Bandpass frequency 5.7M H2 ± 650kHz to extract only the audio signal modulated by
B P F (Bandpass Filter)
7, a QPSK demodulation circuit 8 that demodulates the QPSK modulated audio signal output from the BPF 7 into a PCM audio signal, and a PCM processor 9 that processes the PCM audio signal output from the QPSK demodulation circuit 8. and a memory 10.

The PCM processor 9 uses the memory 10 as a work area to perform deinterleaving and error correction processing on the input PCM audio signal, and outputs the processed PCM audio signal to the selection input terminal 3b of the changeover switch 3. It has become.

The VTR audio reproduction unit 2 includes a magnetic head 18 that reproduces the PCM audio signal recorded on the magnetic tape 19, and a PC that amplifies the PCM audio signal reproduced by the magnetic head 18.
It has an M preamplifier circuit 11, a PCM processor 12 for processing the PCM audio signal amplified by the PCM preamplifier circuit 11, and a memory 13.

The PCM processor 12 uses the memory 13 as a work area to perform deinterleaving and error correction processing on the input PCM audio signal, and outputs the processed PCM audio signal to the selection input terminal 3a of the changeover switch 3. It has become.

The changeover switch 3 selects the PCM from the PCM processor 9.
A selection input terminal 3b into which an audio signal is input, a selection input terminal 3a into which a PCM audio signal from the PCM processor 12 is input, and a deba terminal 3c which switches connections between these selection input terminals 3a and 3b and outputs them. have.

The audio playback section 4 is connected to the output terminal 3c of the changeover switch 3.
A D/A converter 14 that converts a PCM audio signal input from a PCM audio signal into an analog audio signal;
an LPF 15 with a cutoff frequency of 22kHz that removes harmonic components of the analog audio signal output from the LPF 15;
The audio output circuit 16 performs predetermined processing on the analog audio signal output from the audio signal output circuit 1 and outputs the processed analog audio signal.

In the above configuration, when receiving satellite broadcasting, the output terminal 3C of the changeover switch 3 is switched to the selection input terminal 3b. Thereby, the satellite broadcast signal received by the antenna 17 of the satellite broadcast receiver 1 is transmitted to the satellite broadcast tuner circuit 5, the FM demodulation circuit 6. The signal is input as a PCM audio signal to the D/A converter 14 via the BPF 7, QPSK demodulation circuit 8, PCM processor 9, and changeover switch 3, and is converted into an analog audio signal. After that, L.P.F.
15, the signal is taken out from the audio output circuit 16 as an audio output.

On the other hand, when reproducing the PCM audio signal recorded on the magnetic tape 19, the output terminal 3c of the changeover switch 3
is switched to the selection input terminal 3a. As a result, P detected from the magnetic tape 19 by the magnetic head 18
The CM audio signal is sent to the PCM preamplifier circuit 11. Similarly, the signal is input to the D/A converter 14 via the PCM processor 12 and the changeover switch 3, and is converted into an analog audio signal. Thereafter, the signal is outputted from the audio output circuit 16 via the LPF 15 as an audio output.

〔Effect of the invention〕

As described above, the PCM video tape recorder with a built-in satellite broadcasting receiver of the present invention includes a satellite broadcasting receiving section that receives satellite broadcasting and outputs a PCM audio signal, and a satellite broadcasting receiving section that receives a satellite broadcasting and outputs a PCM audio signal. These satellite broadcast receivers or VTR
In a satellite broadcast receiver @ PCM video tape recorder that obtains audio output from the PCM audio signal obtained from the audio playback section, the PCM audio signal output from the satellite broadcast reception section and the PCM audio signal output from the VTR audio playback section are combined. A common D/A converter that converts the signal into an analog audio signal, and a PCM audio signal output from the satellite broadcast receiver and the VT
This configuration includes switching means for switching between the PCM audio signal output from the R audio reproduction section and inputting the signal to the D/A converter.

Therefore, the PCM audio signal output from the satellite broadcast receiving section and the PCM audio signal output from the VTR audio reproduction section can be D/A converted by the same D/A converter. Therefore, the number of parts can be reduced, costs can be reduced, the mounting space can be reduced, and the device can be made smaller.

3 is a changeover switch (switching means), and 4 is an audio reproduction section.

Claims (1)

[Claims] 1. Receiving satellite broadcasting and transmitting PCM (PulseCodeM)
(duration) A satellite broadcast receiving section that outputs an audio signal, and a VTR audio reproduction section that extracts and outputs a PCM audio signal recorded on a magnetic tape. P
Built-in satellite broadcasting receiver that obtains audio output from CM audio signals
In a CM video tape recorder, the PCM audio signal output from the satellite broadcast receiver and the VTR
A common D/A converter that converts the PCM audio signal output from the audio playback section into an analog audio signal, and a common D/A converter that converts the PCM audio signal output from the satellite broadcast reception section and the PCM audio signal output from the VTR audio playback section. Switch to D/
1. A PCM video tape recorder with a built-in satellite broadcasting receiver, characterized in that the PCM video tape recorder has a built-in satellite broadcasting receiver.