JPH0686204A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To perform the sound recording of another program by detecting the presence/absence of the input of a digital sound, selecting which, a television sound or digital sound, should be recorded when it exists and performing modulation and recording by inputting it to a digital voice processing circuit when the video and the sound of television broadcast are recorded. CONSTITUTION:A wave from a digital reception antenna 12 is demodulated to a digital sound signal at a television reception circuit 13, and a sound signal from a digital sound signal input terminal 14 and a demodulated digital sound signal are inputted to a signal presence/absence discrimination circuit 15 and a digital signal change-over switch 16, respectively. The presence/absence of the sound signal in the circuit 13 and that of the sound signal on the terminal 14 are detected at the circuit 15, and the switch 16 is switched to the side in which input exists. At this time, the change-over switch 16 is switched according to an input selection switch 17 when the input exist on both sides, and the sound signal selected at this time is inputted to another source change-over switch 11. In such a way, the switch 11 is switched according to another source selection switch 19 when the digital signal exists in the circuit 15, and the sound signal from a circuit 8 is selected when no digital signal exists.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combination of recording signals in a magnetic recording device having a function of recording video signals, analog audio signals and digital audio signals.

[0002]

2. Description of the Related Art Conventionally, when recording a television broadcast with a magnetic recording device, pages 67 to 6 of "NHK Home Video Technology" (published by Nippon Broadcasting Corporation, published on April 8, 1980).
Page 8, "Chapter 6, Signal Processing for Recording," and 131
As described in "Chapter 10 Mechanism of Audio System" from page 132 to page 132, the radio wave received by the TV antenna is demodulated into a video signal and an audio signal by the tuner, and the video signal is divided into a luminance signal and a color signal. After being processed and processed, it was recorded on a magnetic tape. Similarly, an audio signal was processed by an audio signal recording system and then recorded on a magnetic tape.

Here, a video signal is recorded by superimposing a low-frequency converted color signal on a frequency-modulated luminance signal, and an audio signal is directly AC bias recorded.

[0004]

The above-mentioned prior art is for recording video signals and audio signals as analog signals. Further, recording digital audio signals is not considered, and combinations thereof are also considered. There wasn't.

An object of the present invention is to record digital audio of another program in the digital audio signal recording section at the same time when video and audio of television broadcasting are recorded as analog signals as in the prior art.

[0006]

Means for Solving the Problems The above-mentioned object is to detect the presence or absence of input of digital audio when recording video and audio of television broadcasting, and if yes, record TV audio or digital audio. Is selected, the selected signal is input to the digital audio processing circuit, modulated, and then recorded.

[0007]

The digital signal changeover switch switches between digital audio of the digital broadcast receiving circuit and digital audio of the digital audio signal input terminal, and the signal presence / absence determining circuit determines presence / absence of input of a digital signal and controls the digital signal selecting switch. . The separate source changeover switch switches between television sound and digital sound, and the source changeover control circuit controls the separate source changeover switch by the presence or absence of digital sound and the separate source selection switch. The voice recording circuit synthesizes digital voice and analog voice and records them on a magnetic tape.

[0008]

EXAMPLE An example of the present invention will be described below with reference to FIG. The radio wave received by the television broadcast receiving antenna 1 is demodulated by the television broadcast receiving circuit 2 into a video signal and an analog audio signal. The demodulated video signal is modulated by the video processing circuit 3, amplified by the video recording circuit 4, and recorded on the magnetic tape 6 by the video head 5. The demodulated voice signal is input to the analog voice processing circuit 7 and the analog / digital conversion circuit 8. The analog audio signal input to the analog audio processing circuit 7 is modulated, and then the audio recording circuit 9
It is combined with the digital signal modulated by and amplified, and recorded on the magnetic tape 6 by the audio head 10. The analog audio signal input to the analog / digital conversion circuit 8 is converted into a digital audio signal and input to another source changeover switch 11.

The radio wave received by the digital broadcast receiving antenna 12 is demodulated by the digital broadcast receiving circuit 13 into a digital audio signal. The digital audio signal input from the digital audio signal input terminal 14 and the demodulated digital audio signal are input to the signal presence / absence determining circuit 15 and the digital signal changeover switch 16, respectively. The signal presence / absence determining circuit 15 detects the presence / absence of an audio signal of the digital broadcast receiving circuit 13 and an audio signal of the digital audio signal input terminal 14, and switches the digital signal changeover switch 16 to the input side. However, when both have inputs, the digital signal changeover switch 16 is operated according to the input selection switch 17.
Switch. The audio signal selected by the digital signal changeover switch 16 is input to the separate source changeover switch 11. The source switching control circuit 18 switches the different source selecting switch 11 according to the different source selecting switch 19 when the signal presence / absence determining circuit 15 determines that a digital signal is present. If there is no digital signal,
The audio signal from the analog / digital conversion circuit 8 is selected. The digital audio signal selected by the separate source selection switch 19 is modulated by the digital audio processing circuit 20,
Synthesize with analog voice signal modulated by voice recording circuit 9,
It is amplified and recorded on the magnetic tape 6. The digital signal changeover switch 16 is used for the digital broadcast receiving circuit 13
And switch the voice of the digital voice signal input terminal 14,
The separate source selection switch 19 is a digital signal conversion switch 16 that converts TV sound into a digital signal.
Switch the digital audio selected with.

According to the present embodiment, when recording a television broadcast, when there is a digital broadcast or a digital audio input, a voice different from the television voice can be recorded as a digital voice by switching the switch.
The magnetic tape can be used more effectively.

In this embodiment, the external input signal is a digital audio signal, but even if an analog audio signal is input, it is converted into a digital signal by using the analog / digital converter used for conversion of television audio. As a result, it is possible to obtain the same effect as when digital audio is input.

[0012]

According to the present invention, in addition to video and audio of television broadcasting, audio received by another receiver and audio input from the outside can be recorded.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

[Explanation of symbols]

1 ... TV broadcast receiving antenna, 2 ... TV broadcast receiving circuit, 3 ... Video processing circuit, 4 ... Video recording circuit, 5 ... Video head, 6 ... Magnetic tape, 7 ... Analog audio processing circuit, 8
... analog / digital conversion circuit, 9 ... sound recording circuit, 1
0 ... Audio head, 11 ... Separate source recording changeover switch, 12 ... Digital broadcast receiving antenna, 13 ... Digital broadcast receiving circuit, 14 ... Digital audio signal input terminal, 15
... signal presence / absence determining circuit, 16 ... digital signal switching switch, 17 ... input selecting switch, 18 ... source switching control circuit, 19 ... separate source selecting switch, 20 ... digital audio processing circuit.

Claims (1)

[Claims] 1. A magnetic recording device having a television broadcast receiving circuit and a digital audio signal input circuit or a digital broadcast receiving circuit and having a function of recording a video signal, an analog audio signal and a digital audio signal, wherein the television broadcast receiving circuit is used. While recording the received video and audio as analog signals,
At the same time, a magnetic recording device characterized in that digital audio input from a digital audio signal input circuit or digital audio received by a digital broadcast receiving circuit is recorded as a digital signal.