KR200156785Y1 - Apparatus for recording audio signal in vcr - Google Patents

Abstract

The present invention relates to an audio signal recording apparatus in a video cassette recorder capable of processing hi-fi audio having a fixed audio head and a rotating audio head mounted on a drum, comprising a selection key for selecting an audio recording mode. A key input unit 10 having a plurality of keys and outputting a key signal corresponding to a user's key operation; A microcomputer 20 for selectively outputting first and second mute control signals in response to the selection key signal from the key input unit 10; First and second FM modulators 30 and 40 for frequency-modulating the first and second hi-fi audio signals at respective predetermined carrier frequencies; A first mute unit 50 for selectively muting or outputting the modulated audio signal mixed and applied from the first and second FM modulators 30 and 40 by the first mute control signal from the microcomputer 20. )Wow; A first recording amplifier 60 for amplifying and recording the audio signal from the first mute section 50 to the rotating audio head; An EQ amplifying unit 70 for outputting by amplifying and amplifying a predetermined normal audio signal; A bias signal generator 80 for generating and outputting a predetermined high frequency bias signal; Selectively muting the audio signal from the EQ amplifier 70 applied in superimposition with the high frequency bias signal from the bias signal generator 80 based on the first mute control signal from the microcomputer 20; A second mute unit 90 for outputting; A second recording amplifier 100 which amplifies and records the audio signal from the second muting unit 90 to the fixed audio head to select normal audio, hi-fi audio, normal and hi-fi audio, By allowing recording, audio recording can be arbitrarily selected for the user's taste or image quality improvement.

Description

Audio signal recording apparatus in video cassette recorder

The present invention relates to an audio signal recording apparatus in a video cassette recorder, and in particular, a video cassette capable of selectively recording a hi-fi audio signal in a deep portion of a normal audio track or a video tape according to a user's selection. An audio signal recording apparatus in a recorder.

In general, audio signal recording in a video cassette recorder superimposes a normal audio signal applied to a high frequency bias signal (typically 50 to 100 kHz) and records it directly to a fixed audio head. This recording method is commonly referred to as an AC bias recording method. It is a high frequency multiple of the high limit frequency of the audio signal (typically 3 to 5 times) in order to raise the level up to the point where the linearity, the naturalness and the accuracy of the recorded audio signal are improved. Overlapping bias signals are recorded.

On the other hand, a stereo hi-fi video cassette recorder records normal audio signals with a fixed audio head and records / reproduces hi-fi audio signals with a rotating audio head mounted on a drum.

At this time, the rotating audio head, which is an audio-only head, records the frequency-modulated audio signal and the image signal is superimposed using the rotating video head in a conventional manner.

In other words, the audio signal is two-channel, frequency-modulated and mixed carriers of 1.4MHz and 1.8MHz, respectively, and recorded in the deep portion of the video tape, the image signal is recorded on the upper surface of the deep portion, the azimuth ) Each one +30 Another one is -30 By differently, it prevents the interference between the audio and the video and the audio, thereby enabling a significantly improved hi-fi sound.

However, due to the above-described deep recording of the hi-fi audio signal, deterioration of image quality may occur during long time reproduction. Therefore, the recording of the audio signal may be selectively made into hi-fi, normal, hi-fi and normal according to the improvement of image quality and user's taste. I was looking for a way to do it.

An object of the present invention has been devised in view of the above, and when recording audio signals in a video cassette recorder, it is possible to selectively record in hi-fi audio, normal audio, hi-fi and normal audio according to user's selection. An audio signal recording apparatus in a video cassette recorder is provided.

An audio signal recording apparatus in a video cassette recorder according to the present invention is an audio signal recording apparatus in a video cassette recorder capable of processing hi-fi audio by having a fixed audio head and a rotating audio head mounted on a drum. A key input unit including a plurality of keys including selection keys for selecting a mode and outputting a key signal corresponding to a user's key operation; A microcomputer for selectively outputting first and second mute control signals in response to a selection key signal from the key input unit; First and second FM modulators for frequency-modulating the first and second hi-fi audio signals at predetermined carrier frequencies, respectively; A first mute unit for selectively muting or outputting a modulated audio signal mixed and applied from the first and second FM modulators by the first mute control signal from the microcomputer; A first recording amplifier for amplifying and recording the audio signal from the first mute section to the rotating audio head; An EQ amplifier for compensating and amplifying the applied normal audio signal and outputting the amplified band; A bias signal generator for generating and outputting a predetermined high frequency bias signal; A second muting unit for selectively muting or outputting an audio signal from the EQ amplifier unit applied in superimposition with the high frequency bias signal from the bias signal generation unit based on a second mute control signal from the micom; And a second recording amplifier for amplifying and recording the audio signal from the second muting unit to the fixed audio head.

1 is a block diagram of an audio signal recording apparatus in a video cassette recorder according to the present invention.

* Explanation of symbols for main parts of the drawings

10: key input unit 20: microcomputer

30,40: First and second FM modulator 50,90: First and second mute section

60,100: first and second recording amplifier 70: EQ amplifier

80: write bias signal generator

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 relates to an audio signal recording apparatus in a video cassette recorder according to the present invention, and includes a key input unit 10, a microcomputer 20, a first and second FM modulators 30 and 40, and a first mute unit 50. ), A first recording amplifier 60, an EQ amplifier 70, a bias signal generator 80, a second mute unit 90, and a second write amplifier 100.

In this configuration, the key input unit 10 is an input means for performing the operation of the video cassette recorder, and has a plurality of keys including a selection key for selecting an audio recording mode and corresponding to a key signal of a user's key operation. In general, the key input detects and outputs a key signal loaded on the infrared carrier from the remote control using a remote controller.

The microcomputer 20 is a means for controlling the overall operation of the video cassette recorder, and selectively outputs first and second mute control signals in response to the selection key signal from the key input unit 10 to control the audio recording mode. .

In addition, the first frequency modulator (FM) modulator 30 modulates and outputs an audio signal of an applied first channel with a carrier of 1.4 MHz, and the second FM modulator 40 performs an output of the second channel. The audio signal is frequency-modulated with a carrier of 1.8MHz and output.

Meanwhile, the first mute unit 50 selectively modulates the modulated audio signals from the first and second FM modulators 30 and 40 and selectively modulates the first mute control signal from the microcomputer 20. Output or mute.

The first recording amplifier 60 amplifies the mixed audio signal from the first mute unit 50 to a predetermined amplification degree and applies it to the rotating audio head.

Meanwhile, the EQ (EQualizer) amplifying unit 70 compensates and amplifies the normal audio signal applied to a predetermined band and outputs the amplified signal. The bias signal generating unit 80 generates and outputs a high frequency bias signal (typically, 50 to 100 kHz). do.

The second mute unit 90 superimposes the audio signal from the EQ amplifying unit 70 and the high frequency bias signal from the bias signal generating unit 80 and based on the second mute control signal from the microcomputer 20. Optionally output or mute.

Meanwhile, the second recording amplifier 100 amplifies and applies the audio signal superimposed on the high frequency bias signal from the second muting unit 90 to the fixed audio head.

Next, the operation process of the audio signal recording apparatus according to the present invention having the above-described configuration will be described in detail.

First, the user selects an audio recording mode by using a selection key of the key input unit 10. The audio recording mode includes a normal audio recording mode and a hi-fi audio recording mode; You can select one of three modes: normal audio and hi-fi audio recording mode.

Then, the microcomputer 20 controls the recording of the audio signal in the audio recording mode selected in response to the selection key signal from the key input unit 10.

Meanwhile, the audio recording mode is briefly described above. However, the audio recording mode can be selected using an On Screen Display (OSD) function commonly used in a video cassette recorder.

First, the first hi-fi audio signal Hi-Fi Audio L is frequency-modulated by a predetermined carrier signal (for example, 1.4 MHz) by the first FM modulator 30 and output, and the second hi-fi audio signal Hi- Fi Audio R) is frequency-modulated by the second FM modulator 40 into a predetermined carrier signal (for example, 1.8 MHz) and output.

Then, the frequency-modulated audio signal is mixed with each carrier signal from the first and second FM modulators 30 and 40 and applied to the first mute unit 50.

On the other hand, the normal audio signal (Normal Audio) is amplified and output by a predetermined band is compensated by the EQ amplifier 70, the high-frequency bias signal is generated in the bias signal generator 80, the audio signal from the EQ amplifier 70 And is applied to the second mute unit 90.

When the hi-fi audio signal and the normal audio signal are respectively applied to the first and second mute parts 50 and 90 through the above-described process, the first and second mute parts may be applied based on the first and second mute control signals of the microcomputer 20. 50, 90 selectively outputs or mutes the applied audio signal.

That is, in the normal audio recording mode, the first muting unit 50 is muted and the second muting unit 90 is output. In the hi-fi audio recording mode, the first muting unit 50 is output and the second muting unit 90 is output. Is muted, and both the first and second mute sections 50 and 90 are output in the normal and hi-fi audio recording modes.

Next, the hi-fi audio signal selectively output from the first mute section 50 is amplified by the first recording amplifier 60 and applied to the rotating audio head to be recorded in the deep portion of the video tape.

In addition, the normal audio signal selectively output from the second muting unit 90 is amplified by the second recording amplifier 100, applied to the fixed audio head, and recorded on the audio track of the video tape.

As described above, according to the present invention, by selecting the normal audio, the hi-fi audio, the normal and the hi-fi audio when recording the audio signal in the hi-fi video cassette recorder, the audio recording can be arbitrarily selected to improve the user's taste or image quality. It can be effective.

Claims (1)

An audio signal recording apparatus in a video cassette recorder capable of processing Pi-Fi audio having a fixed audio head and a rotating audio head mounted on a drum, the apparatus comprising: a plurality of keys including a selection key for selecting an audio recording mode And a key input unit 10 for outputting a key signal corresponding to a user's key operation; A microcomputer 20 for selectively outputting first and second mute control signals in response to the selection key signal from the key input unit 10; First and second FM modulators 30 and 40 for frequency-modulating the first and second hi-fi audio signals at predetermined carrier frequencies, respectively; A first mute unit 50 for selectively muting or outputting the modulated audio signal mixed and applied from the first and second FM modulators 30 and 40 by the first mute control signal from the microcomputer 20. )Wow; A first recording amplifier 60 for amplifying and recording the audio signal from the first mute section 50 to the rotating audio head; An EQ amplifying unit 70 for outputting by amplifying and amplifying a predetermined normal audio signal; A bias signal generator 80 for generating and outputting a predetermined high frequency bias signal; Selectively muting the audio signal from the EQ amplifying unit 70 applied in superimposition with the high frequency bias signal from the bias signal generating unit 80 based on the second mute control signal from the microcomputer 20 A second mute unit 90 for outputting; And a second recording amplifier (100) for amplifying and recording the audio signal from the second muting unit (90) to the fixed audio head.