KR980009525U - VSI with Audio Input Selector - Google Patents

Abstract

The present invention proposes a VSI with an audio input selector function that enables monitoring of other audio devices in the vicinity through a simple operation of a remote controller while watching VSI.

Features of the present invention include a remote controller having an audio select key further provided on a VSI function selection operation key, a remote control receiving unit receiving a remote control signal of the remote controller to generate microcomputer input data according to a selection, and a voice in a VSI. A selector for selecting one of an audio signal transmitted from a processor and an audio signal transmitted from a plurality of A / V devices external to VSI and transmitting the selected audio signal to an audio amplifier circuit to which a speaker is connected; And a microcomputer for outputting a control signal for audio selection to the selector if an audio selection key input signal is received from the selector.

The VXial according to the present invention has the effect of monitoring the output of another audio device by simply operating a key of the remote controller during the VISA viewing.

Description

VSI with Audio Input Selector

The present invention relates to the audio signal processing system of VSI, in particular, while watching the image and audio using VSI, the image by VSI is normally output through the television screen, and the audio is output from other A / V devices. And an audio input selector for causing the audio signal to be selected and output.

VSI is divided into normal type and hi-fi type according to his voice signal recording / reproducing method.

In the case of the normal type, the audio head for recording and reproducing the audio signal is fixedly installed between the take-up rail and the video head drum on the videotape odometer, and the audio signal is monaural with the tape traveling speed (3.3 Cm / sec). Will be recorded and played back.

In the hi-fi method, an audio head for recording and reproducing an audio signal is installed on the head drum together with the video head, so that the audio signal can be recorded and reproduced with high fidelity with a high scanning speed (6 m / sec) by the rotating head. do.

The standard audio (monaural) recording method in the general VSI, which occupies most of the existing VSI, shows that the audio track and the control track of the video tape are respectively installed at the top of the fixed head block and at the bottom of the audio head and audio mute head. The audio signal and the control signal by the control head are recorded.

Looking at the flow of the signal according to the recording of the normal audio signal as follows.

First, the audio signal is automatically adjusted in the AGC circuit through the equalizer amplifier at the input stage, and then amplified by the high and low frequencies compensated by the recording equalizer amplifier. At this time, the output signal of the recording equalizer amplifier is mixed with the AC bias of about 70KHz from the bias oscillator through the bias trap circuit and supplied to the audio head. In addition, the output from the AC bias oscillator is simultaneously supplied to the full-amplification head and the audio cancellation head to cancel the signal.

On the other hand, the reproduction signal reproduced by the audio head according to the execution of the reproduction mode is low amplified by the reproduction equalizer circuit and then amplified through the muting circuit.

In this regeneration operation, the bias oscillator and the AGC circuit do not operate, and the muting circuit is controlled according to the on / off signal from the servo system.

As described above, the monaural audio signal by the widely used VHS standard recording method is recorded on the audio track on the top of the video tape by using an alternating current bias according to a fixed head method such as an audio tape recorder.

At this time, the recording speed is only 3.3Cm / sec, which is lower than the recording and playback speed of the audio cassette tape recorder (4.8Cm / sec). In the case of reproducing the frequency characteristics and the wow flutter characteristics deterioration according to the change of the tape and the head over time, high quality can not be obtained.

Hi-Fi video, however, installs an audio-only head on a rotating drum in the same way as a video head, in order to make the relative speed of tape and head significantly higher than that of conventional video.

Two audio heads are provided in the rotating drum of the video to record the FM signal by FM modulation. The audio signal is recorded in the tape thickness direction in advance of the video signal.

Since the carrier of the audio signal has a lower frequency than the carrier of the luminance signal, and the audio head gap is wider than the video head gap, it is magnetized to the deep part of the tape.

The video signal is superimposed on it. When the video signal is recorded on the recorded audio signal, a shallow magnetization video signal is recorded on the tape surface, and an audio signal is left in the deep tape portion below it. Kinds of signals coexist.

On the other hand, at the time of audio signal reproduction, the audio signal surface layer portion on the tape is erased so that a slight decrease in reproduction output (about 12 dB) appears, but no FM problem occurs because FM modulation is performed.

Since the audio signal is a stereo 2 channel, the audio signal is FM-modulated by two carriers on the left and right sides, and the spectrum of the audio signal is completely identical to the spectrum of the video signal.

This may theoretically cause crosstalk between the audio and video signals, but in practice, the crosstalk problem is solved through azimuth recording.

The video head has an azimuth angle of ± 6 ° and the audio head has an azimuth angle of ± 30 °. Therefore, even if signals are recorded on the same track in duplicate, since the azimuth angles of the two heads are different, only the head output corresponding to the azimuth angle of each recording track can be separated and reproduced.

The audio signal of the first channel is recorded by the audio R channel head in the first audio track on the video tape, and the audio signal of the second channel is recorded by the audio L channel head in the second audio track.

Video signals from the R / L video head are superimposed and recorded on two R / L video tracks formed on the audio track.

The recording and reproducing method of the hi-fi VSI is able to obtain high quality sound quality that can be actually obtained from a compact disc.

However, as described above, the output of the audio signal of VSI is always accompanied by the video signal.

Therefore, in order to monitor the audio output of another A / V device when watching a broadcast program received by the tuner of V'Sial through the TV screen or the video of the tape playback, mute the current V's output. It was causing inconvenience in the operation that the volume of the A / V equipment had to be increased and adjusted later.

The object of the present invention is to monitor the audio of another A / V device while watching TV broadcast program or video tape using VSIAL, and to control audio components such as tape player and CD player through remote key operation of VSIAL's remote controller. It only provides a VSI with an audio input selector that allows arbitrary selection and output or switching.

Features of the present invention include a remote controller provided with an audio select key in addition to a basic operation key for selecting a BTial function, a remote control receiver for receiving a remote control signal of the remote controller and creating microcomputer input data according to a selection, and VSIAL. A selector for selecting one audio signal from an audio signal transmitted from an internal audio processor and an audio signal transmitted from a plurality of A / V devices external to VSI and transmitting the same to an audio amplification circuit to which a speaker is connected; If there is an audio selection key input signal from the remote control receiver, it is in a VSI including a microcomputer for outputting a control signal for selecting the corresponding audio to the selector.

1 is a circuit diagram of the present invention.

* Explanation of symbols for the main parts of the drawings

10: BR11 11: Remote controller 12: Remote control receiver

13: Micom 14: Tuner 15: Deck

16 tape playback circuit 17 audio processor 18 selector

19: audio tape player 23: audio amplifier circuit

Referring to the present invention based on the accompanying Figure 1 as follows.

Here, the television broadcast signal received through the antenna is connected to the tuner 14 for tuning the desired channel by the user, and the intermediate frequency signal of the tuning channel output from the tuner 14 is an image processor (not shown). ) Is transmitted to the audio processor 17.

The audio and video signals on the video tape picked up by the audio head and the video head in the traveling system of the tape deck 15 are connected to the tape playing circuit 16 and the audio signals output from the tape playing circuit 16 are The audio processor 17 is connected to the audio processor 17.

The audio signal component output from the audio processor 17 is connected to the selector 18 for transmission.

Also, the selector 18 includes various A / V devices external to the VSI, for example, an audio tape player 19, a second V20 for editing or copying an image, and a second as shown in the drawing. The audio signal components of the tuner 21, the CD player 22, and the like are connected to each other.

The output of the selector 18 is connected to the external audio amplifier circuit 23 so that the audio signal amplified by the audio amplifier circuit 23 is output as an audible signal through the speaker 24.

On the other hand, the selector 18 is connected so that the control output of the microcomputer is applied to receive the audio select signal from the microcomputer 13 as a control selection signal, and the remote control to the microcomputer 13. The audio selection key input signal from the receiver 12 is connected to be applied.

The remote control receiver 12 is designed to accept a key input of an audio selection key specially provided on the remote controller 11 to recognize it.

Referring to the operation of the present invention configured as described above are as follows.

First, a channel desired by the tuner 14 is tuned to a television broadcast signal received through an antenna.

The intermediate frequency signal of the television broadcast channel tuned by the tuner 14 is finally output as an image on the screen of the television through the image processing unit (not shown), and the selector 18 via the audio processing unit 14. ) Is applied.

In addition, the audio processor 17 receives the audio signal on the video tape picked up by the audio head in the traveling system of the tape deck 15 via the tape reproducing circuit 16.

Therefore, in the audio processing unit 17, one of the audio signal of the television broadcast and the audio signal reproduced from the video tape is selected and applied to the selector.

On the other hand, the selector 18 includes various A / V devices external to VSI, for example, an audio tape player 19, a second VSI 20 for editing or copying an image, and a second as shown in the drawing. Audio signal components such as tuner 21 and CD player 22 are input.

In such a state, when there is a key input of a selection key for audio monitoring, which is specially provided in the remote controller 11, the remote control receiver 12 receives the converted key and converts it into a logic value for the microcomputer input.

If there is an audio selection key input from the remote control receiver 12, the microcomputer 13 analyzes it and sends a control signal for selecting the audio signal component of the corresponding audio device to the selector 18 side.

The audio signal of the external device selected by the selector 18 is converted into an audible frequency signal from the speaker 24 through the audio amplifying circuit 23 in place of the audio signal of the audio processor 17, and is output.

As described above, the present invention is intended to monitor the audio of other A / V devices installed in the vicinity while watching a television program using VSI or watching a recorded program by playing a video tape. By specially operating the audio selection key provided in the remote controller, it is possible to arbitrarily remotely select and output or switch audio signal components such as a tape player, a second BC, a second tuner, and a CD player. Using the included A / V system, it is possible to easily monitor other audio devices even while watching a video.

Claims (1)

A remote controller 11 further comprising an audio select key in a VSI function selection operation key, a remote control receiver 12 receiving a remote control signal of the remote controller 11 to generate logic data for a microcomputer input, and a V An audio amplification circuit to which the speaker 24 is connected by selecting one of the audio signals transmitted from the audio processing unit 17 inside the sial and the audio signals transmitted from a plurality of A / V devices outside the Vial. A selector 18 for transmitting to the 23, and a microcomputer 13 for outputting a control signal for selecting the corresponding audio to the selector 18, if there is an audio selection key input signal from the remote control receiver 12; A VSI having an audio input selector, characterized in that it comprises. ※ Note: This is to be disclosed based on the first application.