JPH0547105A - Video cassette player - Google Patents

Abstract

PURPOSE:To enjoy bilingual or trilingual telecast, etc., by selecting plural audio signals reproduced from a tape with an identification signal reproduced from the tape and eliminating cross talk. CONSTITUTION:The plural audio signals reproduced from the tape are inputted in an audio signals switching circuit 8, and on the other hand, the identification signal reproduced from the tape is inputted in an identification signal read circuit 7, then the audio signal switching circuit 8 is controlled by a control signal outputted from the identification signal read circuit 7 and the plural audio signals are selected. One of the plural audio signals selected by the audio signal switching circuit 8 and one of the plural audio signals reproduced the tape are in pairs and listened by a headhone. They are listened as stereo signals consisting of two kinds audio signals or as monaural signals of the same kind signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette player for automatically switching audio signals in an entertainment system such as an aircraft.

[0002]

2. Description of the Related Art A video cassette player in an entertainment system such as an aircraft has been put to practical use as a source for providing passengers in a passenger cabin with video and audio for safety demos and entertainment such as movies. With such a practical video cassette player,
It was practically sufficient to reproduce and output an audio signal in one language for one video signal recorded on the tape.

The structure of such a video cassette player will be described with reference to FIG. In FIG. 2, 21 to 23 are audio signal reproducing heads for reproducing the audio signals recorded on the tape, 24 to 26 are audio signal reproducing circuits for processing the reproduced audio signals, and 28 is an audio signal reproducing circuit 24. An audio signal detection circuit for detecting the loss of an audio signal, 28 is an audio signal switching circuit for switching the output of the audio signal reproduction circuits 24 to 26 by the output of the audio signal detection circuit 27 and outputting it to the output terminals 29, 30. Left and right receivers of headphones, for example, are connected to the output terminals 29 and 30 of the.

One video signal and a plurality of audio signals are recorded on the tape, and an FM-modulated stereo signal is recorded on a track reproduced by an audio signal reproducing head 21 composed of a rotary head and a fixed head. In the track reproduced by the audio signal reproducing heads 22 and 23, two kinds of audio signals forming stereo are recorded as corresponding auxiliary signals for compensating for the lack of the stereo signal when the stereo signal is lost, by the corresponding monaural signals. When the audio signal detection circuit 27 detects the stereo signal of the audio signal reproduction circuit 24, the pair of switches 28 of the audio signal switching circuit 28
Switch a and 28b to the upper contact and output two types of audio signals of the reproduction stereo signal of the audio signal reproduction circuit 24, output terminals 29 and 30
Output to and listen as a stereo signal through headphones.

At this time, if the signal output from the audio signal reproducing head 21 is missing, the audio signal detecting circuit 27 detects this period and turns down the pair of switches 28a and 28b of the audio signal switching circuit 28. Switch to the contact on the side and output the two types of audio signals that form stereo from the audio signal reproduction circuits 25, 26 to the output terminals 29, 30 and listen as stereo signals through the headphones, and output the audio signal reproduction circuit 24. Interpolate the omissions.

[0006]

When the video cassette player having the above-mentioned structure is used for bilingual (two language) broadcasting or trilingual (three language) broadcasting, the audio signal switching circuit 28 is appropriately switched. At this time, in the case of bilingual broadcasting, for example, a stereo signal is adopted as the audio signal of the second language, and two types of audio that form stereo on the tracks of the audio signal reproducing heads 22 and 23 are used. If you record each signal as a corresponding monaural signal, the switching circuit 28
By switching the pair of switches 28a, 28b to the lower contacts, the audio signal of the second language can be heard as a stereo signal. As a result, it is possible to selectively enjoy bilingual broadcasting.

However, in the case of trilingual broadcasting, the audio signals of the second and third languages are re-headed by the audio signal.
Assuming that recording is made on the tracks of 22, 23 with the corresponding monaural signals, the pair of switches 28 of the switching circuit 28 will be recorded.
When a and 28b are switched to the lower contacts, the voice signals of the second and third languages are heard at the same time and the content becomes unintelligible.

The present invention solves the above-mentioned problems, and enables the use of a tape for recording one video signal and a plurality of audio signals for bilingual or trilingual broadcasting or broadcasting in a further national language, and It is an object of the present invention to provide a video cassette player in which completely different kinds of audio signals are not simultaneously heard in the headphones.

[0009]

In order to solve the above problems, the video cassette player of the present invention is coded in advance to discriminate one video signal, a plurality of audio signals, and the types of a plurality of audio signals. And a plurality of audio signal reproducing circuits for processing a plurality of audio signals reproduced from the tape, an identification signal reading circuit for reading the identification signals reproduced from the tape, and An audio signal switching circuit which has a plurality of switches to which a plurality of audio signals processed by a plurality of audio signal reproduction circuits are input, and which switches the switches according to the output of the identification signal reading circuit to select an audio signal; An output terminal group comprising one pair of the plurality of processed audio signals and a plurality of switch outputs of the audio signal switching circuit. It is.

[0010]

With the above construction, a coded identification signal for discriminating the kind of the recorded plural audio signals is added to the tape on which one video signal and plural audio signals are recorded and recorded. Then, the plurality of audio signals reproduced from the tape are processed by the plurality of audio signal reproduction circuits and input to the plurality of switches of the audio signal switching circuit. On the other hand, the identification signal reproduced from the tape is read by the identification signal reading circuit, and the switch is switched by this signal to select the audio signal. By listening to one of the switch outputs of the audio signal switching circuit and one of the processed audio signals as a pair through the headphones,
It can be heard as a stereo signal composed of different types of audio signals or as a monaural signal composed of the same type of audio signal, and completely different types of audio signals can be heard simultaneously from the left and right receivers of the headphones. Can solve the problem of being inaudible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block circuit diagram of an audio signal system of a video cassette player according to an embodiment of the present invention. In FIG. 1, 1 to 3 are audio signal reproducing heads for reproducing the audio signals recorded on the tape, and two kinds of audio signals are FM-modulated as stereo signals on the tracks of the audio signal reproducing head 1 composed of this rotary head. Is recorded as
The identification signal is recorded, and the audio signals are recorded as monophonic signals on the tracks of the audio signal reproducing heads 2 and 3 composed of fixed heads as trilingual broadcasting second and third language audio signals. It is assumed that The identification number is a coded signal for discriminating the types of these plural audio signals.

Reference numerals 4 to 6 are audio signal reproducing circuits for processing reproduced audio signals. The audio signal reproducing circuit 4 processes the audio signals reproduced by the audio signal reproducing head 1 to form two types of stereo. Each of the audio signals is output, and the reproduced identification signal is processed and output. An identification signal reading circuit 7 reads the identification signal output from the audio signal reproducing circuit 4 and outputs a control signal.

An audio signal switching circuit 8 has a pair of switches 8a, 8b and 8c, 8d. The upper contact of the switch 8a is one output of the audio signal reproducing circuit 4 and the lower contact is the other. Reversely, the upper contact of the switch 8b is connected to the other output of the audio signal reproducing circuit 4, the lower contact is connected to the one output of the audio signal reproducing circuit 4, and the upper contact of the switch 8c. Is connected to the output of the audio signal reproducing circuit 5, the lower contact is connected to the output of the audio signal reproducing circuit 6, and the upper contact of the switch 8d is the output of the audio signal reproducing circuit 6 contrary to the above. The lower contacts are connected to the outputs of the audio signal reproduction circuit 5, respectively.

9 to 16 are output terminals, 9 and 10, 11 respectively.
, 12, 13 and 14, 15 and 16 can be connected to the headphones in pairs. The output terminal 9 is directly connected to the one output of the audio signal reproducing circuit 4, and the output terminal 10 is the common contact of the switch 8a. Further, the output terminal 11 is directly connected to the common contact of the switch 8b, the output terminal 12 is directly connected to the other output of the audio signal reproducing circuit 4, and the output terminal 13 is directly connected to the output of the audio signal reproducing circuit 5. The output terminal 14 is directly connected to the common contact of the switch 8c, the output terminal 15 is directly connected to the common contact of the switch 8d, and the output terminal 16 is directly connected to the output of the audio signal reproducing circuit 6.

Next, the operation of the video cassette player having the above structure will be described. In this case, as the identification signal, the audio signal reproduced from the audio signal reproducing head 1 is used as a stereo signal, and the audio signal reproduced from the audio signal reproducing heads 2 and 3 is used as a trilingual broadcast second language or a third language. A code is set so as to be used individually as the voice signal of the first language. In response to the control signal output from the identification signal reading circuit 7 that has read the identification signal, the audio signal switching circuit 8 connects the pair switches 8a and 8b to the lower contacts, and the other pair switches 8c and 8d. Respectively to connect to the upper contacts. With this connection, you can listen to the stereo audio signal of the first language, whether the headphones are connected to the pair of output terminals 9 and 10 or the pair of output terminals 11 and 12. By connecting to the output terminals 13 and 14 of the pair, 2 for trilingual broadcasting
You can hear the monaural audio signal of the third language, and by connecting to the output terminals 15 and 16 of the pair, you can hear the monaural audio signal of the third language of the trilingual broadcast.

In addition, the FM-modulated signal as a stereo signal is recorded on the track of the audio signal reproducing head 1, and the bilingual audio signal in the second language is recorded as a stereo signal on the tracks of the audio signal reproducing heads 2 and 3. If the identification signal is present, the pair switches 8a and 8b of the audio signal switching circuit 8 are used as the lower contacts and the pair switch 8 is used as the identification signal.
A code is set so as to connect c and 8d to the lower contacts, respectively.
10 or 11, 12 can hear the stereophonic signal of the first language, and output terminals 13, 14 or 15, 16 of the pair can hear the stereophonic signal of the second language.

In addition, a plurality of audio signals recorded on the tape can be similarly used as monaural signals of different types. In this case, the identification signal is set with a code for controlling all the pair switches 8a, 8b and 8c, 8d of the audio signal switching circuit 8 to be connected to the upper contacts.

[0018]

As described above, according to the present invention, the identification signal recorded on the tape is reproduced, and the audio signal switching circuit is controlled by the control signal output from the identification signal reading circuit. A stereo audio signal or the same kind of monaural audio signal will be output to each of the output terminals of the pair that connects the, and the problem that multiple audio signals of different types can be heard at the same time and the contents cannot be understood is resolved. It

[Brief description of drawings]

FIG. 1 is a block circuit of an audio signal system of a video cassette player according to an embodiment of the present invention.

FIG. 2 is a block circuit diagram of an audio signal system of a conventional video cassette player.

[Explanation of symbols]

 1-3 Audio signal reproducing head 4-6 Audio signal reproducing circuit 7 Identification signal reading circuit 10-16 Output terminal

Claims (1)

[Claims] 1. A tape in which one video signal, a plurality of audio signals, and a coded identification signal for discriminating the types of a plurality of audio signals are recorded in advance, and a plurality of tapes reproduced from the tape are used. A plurality of audio signal reproducing circuits for processing the audio signals, an identification signal reading circuit for reading the identification signals reproduced from the tape, and a plurality of inputting the plurality of audio signals processed by the plurality of audio signal reproducing circuits. An audio signal switching circuit which has a switch and switches the switch according to an output of the identification signal reading circuit to select an audio signal; and one of the processed audio signals.
And an output terminal group consisting of one pair of a plurality of switch outputs of the audio signal switching circuit.