KR940011081B1 - Audio apparatus for vcr - Google Patents

Abstract

The reproducing circuit reproducing the normal voice sound even though the speed of the VCR tape is varied comprises a signal amplification means (10) amplifying the control signal generated by a servo circuit; a clock generator (20) generating the clock signal based on the amplified control signal; a sampling means (30) sampling the voice signal based on the clock signal which varies according to the VCR tape speed; a time constant generator (40) generating the varying charging/discharging signal according to the speed changing signal from the micro-processor; an integrator (50) integrating the sampled data from the sampling means (30) to feed to an automatic level controller (60); an input switching means (70) switching the reproduced voice signal from the magnetic head to the sampling means (30) or the automatic level controller (60).

Description

Voice output device in the V-sear mode

1 is a block diagram of a voice output apparatus in a shift mode of the present invention.

2 is a waveform diagram of input and output parts of FIG.

* Explanation of symbols for main parts of the drawings

10: control signal amplifier 20: clock generator

30: voice sampling unit 40: time constant generator

50: integrator 60: automatic level control unit

70: input switching unit

The present invention relates to a voice output device in a shift mode of a VCR that allows a normal audio sound to be distorted even when the tape travel speed is changed in a V-seal (hereinafter referred to as a VCR).

In general, when the VCR enters the shift mode, the capstan's rotation speed becomes slower or faster than the normal playback mode, and the tape's running speed changes. When the tape's running speed increases, the recorded audio signal is distorted. As a result of demodulation, there is a problem that a user cannot hear or annoy the voice.

Therefore, in the related art, only the video signal is output by muting such annoying audio signal output, and in this case, there is a problem in that it causes inconvenience to the user because only the screen is seen and the audio cannot be heard accordingly.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems as described above. After sampling a voice signal recorded on a tape in a shift state using a control signal from a servo, the sampled signal is normal voice signal. The present invention will be described in detail with reference to the attached FIGS. 1 and 2 as shown in FIG.

1 is a block diagram of a voice output device in a shift mode according to the present invention. As shown in FIG. 1, a control signal amplifying unit 10 amplifies a control signal input from a servo circuit, and an amplified control signal. A clock generator 20 for generating a clock signal, a voice sampling unit 30 for intermittently outputting an audio signal input according to the output signal of the clock generator 20, and a shift control signal of a microcomputer A time constant generator 40 for generating a signal to be charged and discharged at a set period, an integrator 50 for integrating the voice signal output from the voice sampling unit 30 with the output signal cycle of the time constant generator 40, and an integral Automatic level control unit 60 for adjusting the audio signal to have a proper level, and the audio signal reproduced from the tape by switching according to the shift control signal of the microcomputer to the voice sampling unit 30 or the automatic level control unit 60 It consists of an input switching unit 70 composed of transistors TR1 and TR2 to be applied.

Here, reference numeral D1 is a diode such that only the positive polarity signal is applied to the clock generator 20 among the positive and negative polarity control signals output from the control signal amplifier 10.

According to the present invention configured as described above, when the VCR enters the shift mode, the servo circuit reproduces the control signal recorded on the control track of the tape to be used as a reference signal at the time of reproduction. Is amplified to an appropriate level as shown in FIG. 2A.

The amplified signal passes through the diode D1 so that only a positive control signal is applied to the clock generator 20, and the clock generator 20 receives a clock signal as shown in FIG. 2B based on this signal. The audio signal reproduced from the tape is sampled according to the clock signal outputted here.

That is, in the shift mode, a high potential shift control signal is output from the microcomputer, and the signal is applied to the bases of the two transistors TR1 and TR2 of the input switching unit 70, so that the transistor CR1 is turned on and the other transistor is turned on. TR2 is turned off, whereby the audio signal reproduced from the tape is applied to the voice sampling unit 30 through the conducting transistor IR1, and the voice sampling unit 30 transfers the input voice signal to the clock generator ( The audio signal sampled as shown in FIG.

In addition, in the time constant generator 40, charge and discharge are generated by the internal capacitor and the resistance as the high-speed shift control signal is applied from the microcomputer, and thus the time constant corresponding to the frequency (50 Hz) in the shift mode as shown in FIG. Signal is output, and the integrator 50 receives the voice signal sampled using the charge / discharge signal. It integrates at intervals (see also 2e), and is amplified and output to an appropriate level by the automatic level adjusting unit 60 of the integrated voice signal.

On the other hand, in the normal regeneration mode, the shift control signal of the microcomputer is output in the low potential state.

Therefore, since the transistor TR1 is turned off in the input switching unit 70 and the audio signal reproduced from the tape is not input to the voice sampling unit 30, the voice sampling unit 30 is not operated.

In addition, since the time constant generator 40 does not operate as the shift control signal of low potential is applied from the microcomputer, the integrator 50 also does not operate.

At this time, since the other transistor TR2 of the input switching unit 70 is in an on state, the reproduced voice signal is applied to the automatic level adjusting unit 60 through the transistor TR2 as it is, and in the automatic level adjusting unit 60. The signal is amplified to an appropriate level and output.

As described above, the present invention samples and reproduces the reproduced voice signal using the control signal in the shift mode, so that the user can hear and output the voice so that the viewer can listen to the voice while watching the screen. It works.

Claims (1)

A VCR for outputting an audio signal in a shift mode, comprising: a control signal amplifier 10 for amplifying a control signal output from a servo circuit; and a clock generator 20 for generating a clock signal based on the amplified control signal. ), A voice sampling unit 30 for intermittently outputting an audio signal input according to the output signal of the clock generator 20, and a clock to generate a signal charged and discharged at a set period by operating according to the shift control signal of the microcomputer. An integrator 50 for integrating the voice signal output from the water generator 40 and the voice sampling unit 30 in the output signal period of the visibility generator 40 and outputting the integrated signal to the automatic level control unit 60; The automatic level control unit 6 for adjusting the audio signal to have a proper level, and the audio signal which is switched according to the shift control signal of the microcomputer and reproduced on the tape is input to the voice sampling unit 30 or the automatic level control unit 60. Input A sound output device when the transmission mode of said V-Al, characterized in that with a switching unit (70).