KR19990012994A - Audio output level control system of the television - Google Patents

Abstract

The present invention includes a voice processing system for processing a voice signal output from a VCR or a television according to an input operation control signal, and a voice processing unit for amplifying and outputting the voice signal to a predetermined size according to the input level control signal. A voice output level control signal detector for detecting a voice output level control signal at regular time intervals according to an input operation control signal, and an IKhz signal serving as a criterion for determining an output level change output from the voice processor. A voice output level detector for detecting at a time interval, a comparator for detecting a difference between a plurality of voice output levels detected last by the voice output level detector according to an input operation control signal, and a voice output level control signal detector for a predetermined time interval Outputs an operation control signal The audio output detected by the audio output level control signal detector to output the IKhz signal to the audio processing unit at predetermined time intervals and to output the operation control signal to the comparator if there is an operation signal of the VCR driver. And a microcomputer that adds or subtracts the level control signal to compensate for the difference in the audio signal output strength in the television mode and the VCR mode.

Description

Audio output level control system of the television

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for controlling the audio output level of a television. In particular, when a television and a VCR are shared, a difference of the audio signal output strength in the television mode and the VCR mode can be compensated when the television mode is switched from the television mode to the VCR mode. A voice output level control system.

A television generally receives and reproduces radio aerial waves containing voice and image information transmitted from a broadcasting station so that a user can view image information and audio information transmitted from the broadcasting station, and an image reproducing / recording apparatus (hereinafter referred to as VCR) Video recording and audio signals are recorded on magnetic video tape and reproduced when necessary.

The television and the VCR can share a mutual system using a connecting jack. For example, the television and the VCR are connected to a jack to output video and audio information recorded on a video tape to the outside through the television. The broadcasting signal received through the television can be recorded on the video tape seated on the VCR.

A common example of the television and the VCR will be described with reference to FIG. 1 below.

FIG. 1 is a block diagram showing an embodiment of a voice processing system in a conventional TVCR (a system commonly used as a television and a VCR).

The conventional TVCR voice processing system shown in FIG. 1 includes a microcomputer 30 for controlling overall operations of a television or a VCR by manipulating a key input unit 10 or a remote controller 20, and the microcomputer 30. Tuner 50 for receiving the broadcast signal of the channel selected by the channel tuning voltage output from the antenna ANT, and IF detector 60 for detecting the intermediate frequency from the broadcast signal received by the tuner 50. ), A VCR driver 70 for reading video and audio information recorded on a video tape according to an operation control signal output from the microcomputer 30, and a selection signal output from the microcomputer 30. A predetermined signal is selected from a plurality of voice signals output from the IF detector 60 and the VCR driver 70, and has a magnitude corresponding to a pulse width modulation (PWM) signal, which is an output level control signal output from the microcomputer 30.By width and a voice processing section 80 for output to speaker 90. The

The operation of the TVCR will be described in more detail. When the user watches TV and switches to the VCR mode using the key input unit 10 or the remote controller 20, the microcomputer 30 sends an operation control signal to the VCR driver 70. Is applied to allow the VCR to operate, and outputs a predetermined selection signal to the voice processing unit 80.

The VCR driver 70 reads out the voice information and the image information recorded on the video tape, and the voice signal read out by the VCR driver 70 is input to the voice processor 80.

The voice processor 80 selects a voice signal output from the VCR driver 70 according to a selection signal output from the microcomputer 30, and selects the voice signal according to an output level control signal output from the microcomputer 30. Amplify to the size of the output to the speaker (90).

However, as described above, when the television and the VCR are shared, the same output level control signal in the television mode and the VCR mode due to any cause (such as when the intensity of the audio signal recorded on the videotape is recorded smaller than the reference intensity). Is applied to the voice processing unit, a difference may occur in the intensity of the voice signal output through the speaker.

Therefore, conventionally, when a user wants to view image information recorded on a videotape, there is a hassle of having to set the audio output level suitable for the VCR mode again.

According to the present invention for solving the above problems, when the television and the video are shared, the audio output level of the television can be compensated for the difference of the audio signal output strength in the television mode and the VCR mode when the television mode is switched to the VCR mode. The purpose is to provide a control system.

1 is a block diagram showing a speech processing system of a typical TVCR.

2 is a block diagram illustrating a speech processing system including a speech output level control system of a TVCR according to the present invention;

Explanation of symbols on the main parts of the drawings

10: key input unit 20: remote control

30: Micom 50: Tuner

70: VCR driver 80: voice processor

100: PWM detector Q1: switching means

110: integrator 120: DC level detector

130: memory 200: audio output level detector

210: integrator 220: DC level detector

230: memory 300: comparator

A feature of the present invention for achieving the above object is a voice processing unit for processing the audio signal output from the VCR or television according to the input operation control signal and amplifies and outputs the audio signal to a predetermined size according to the input output level control signal A sound processing system of a television comprising: a sound output level control signal detector for detecting the sound output level control signal at regular time intervals according to an input operation control signal, and a determination of an output level variation output from the sound processor. A voice output level detector for detecting a predetermined signal as a reference at the above-described time interval, a comparator for detecting a difference between a plurality of voice output levels detected last by the voice output level detector by an input operation control signal, and Voice output level control signal detection Outputs an operation control signal at the above-mentioned time interval, and outputs a signal having a predetermined magnitude, which is a reference for measuring the voice output level variation, to the voice processing unit at the time interval, and outputs an operation control signal to the comparator if there is an operation signal of the VCR driver. And a microcomputer for outputting and subtracting a voice output level control signal detected by the voice output level control signal detector to cancel the difference of the voice output level signal detected from the comparator. The difference in power intensity is compensated for.

An additional feature of the present invention for achieving the above object is that the voice output level control signal detection unit switching means that is turned on / off by the operation control signal output from the microcomputer at a predetermined time interval, and the switching An integrator for integrating the signal output from the means, a DC level detector for detecting a DC level in the signal output from the integrator, and a memory in which the signal output from the DC level detector is updated and written; Is to use a transistor.

Another additional feature of the present invention is that the microcomputer outputs a signal of IKhz to the voice processor.

In still another aspect of the present invention, the voice output level detector may include an integrator for integrating an IKhz signal having a predetermined magnitude added or subtracted from the voice processor, a DC level detector for detecting a DC level from a signal output from the integrator, The signal output from the DC level detector includes a memory that is updated and recorded.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram illustrating an embodiment of a system for controlling audio output level of a TVCR according to the present invention.

A tuner 50 for receiving a broadcast signal of a channel selected by the input tuning voltage from the antenna ANT, an IF detector 60 for detecting an intermediate frequency from the broadcast signal received by the tuner 50; The VCR driver 70 reads the video and audio signals recorded on the videotape according to the input operation control signal, and the IF detection unit 60 and the VCR driver 70 output the input operation control signal. The voice processor 80 outputs the speaker 90 by amplifying the signal to a size corresponding to the PWM signal, which is an output level control signal input by selecting a predetermined signal from the plurality of output audio signals, and by the input operation control signal. PWM detection unit 100 for detecting the PWM signal level at regular time intervals, and audio output for detecting the magnitude of a predetermined signal output from the voice processing unit 80 at the above-described time interval A comparator 300 for detecting a difference between a bell detection unit 200 and a plurality of voice output level signals last detected by the voice output level detection unit 200 according to an input operation control signal, and by the user's selection The microcomputer 30 applies an operation control signal to a plurality of devices constituting the TVCR based on the signal output from the key input unit 10 or the remote controller 20.

The microcomputer 30 outputs a signal having a predetermined magnitude to operate the PWM detector 100 at the above-described time intervals, and outputs a signal of 1 kHz that is a criterion for determining the change in the voice output level at the above-described time intervals. )

The microcomputer 30 determines a signal input through the key input unit 10 or the remote controller 20, and when an operation signal of the VCR driver 70 is input, applies the operation control signal to the comparator 300. On the basis of the result of the comparator 300, another PWM signal is added to the voice processor 80 so that the difference in the voice signal output strength is compensated in the television mode and the VCR mode by subtracting the PWM signal detected by the PWM detector 100 by a predetermined magnitude. Output

The PWM detection unit 100 integrates the switching means Q1 whose on / off is controlled by the operation control signal output from the microcomputer 30 at predetermined time intervals, and the signal output from the switching means Q1. An integrator 110, a DC level detector 120 for detecting a DC level from a signal output from the integrator 110, and a memory 130 for updating and recording a signal output from the DC level detector 120. Including the switching means Q1 preferably uses a transistor.

In addition, the voice output level detector 200 is output from the microcomputer 30, the integrator 210 for integrating a signal of 1 kHz, which is predetermined or decremented according to the change in the voice output level in the voice processor 80, and the integrator And a DC level detector 220 for detecting a DC level from the signal output from 210 and a memory 230 for updating and writing the signal output from the DC level detector 220.

Therefore, according to the present invention, when the transition from the television mode to the VCR mode, the last plurality of audio output level signals detected by the audio output level detection unit 200 at predetermined time intervals are compared by the comparator 300, and the microcomputer 30 is compared. Since the PWM signal detected by the PWM detector 100 according to the difference of the audio output level signal output from the comparator 300 is added or subtracted by a predetermined magnitude according to the difference of the audio output level, and output to the voice processing unit 80, the television mode. In the VCR mode, the difference between the voice signal output strengths is compensated.

The present invention operated as described above is compensated for the difference of the audio signal output strength in the television mode and the VCR mode when switching from the television mode to the VCR mode, thus eliminating the hassle of resetting the audio output level in the VCR mode. Satisfaction and convenience in use are improved.

Claims (5)

A voice processing system of a television comprising a voice processing unit for processing a voice signal output from a VCR or a television according to an input operation control signal, and amplifying and outputting the voice signal to a predetermined size according to an input level control signal. A voice output level control signal detector for detecting a magnitude of the voice output level control signal according to an operation control signal input at a predetermined time interval; A voice output level detector for detecting a magnitude of a specific signal inputted to the voice processor at the time interval and added or subtracted to a predetermined size according to a change in an output level; A comparator for detecting a difference between a plurality of signals last detected by the voice output level detector by an input operation control signal; Outputs a corresponding signal to the voice output level control signal detector and the voice processor at predetermined time intervals, and outputs an operation control signal to a comparator according to an operation signal of the VCR driver to adjust a difference of the voice output level signal detected from the comparator. And a microcomputer that adds or subtracts the magnitude of the audio output level control signal detected by the audio output level control signal detector to cancel the audio output level of the television to compensate for the difference in the audio signal output strength in the television mode and the VCR mode. Control system. 2. The apparatus of claim 1, wherein the audio output level control signal detection unit integrates switching means for controlling on / off by an operation control signal output from the microcomputer at predetermined time intervals, and a signal output from the switching means. And an integrator, a DC level detector for detecting a DC level in a signal output from the integrator, and a memory for updating and recording a signal output from the DC level detector. 3. The audio output level control system for a television according to claim 2, wherein said switching means uses a transistor. The system of claim 1, wherein the microcomputer outputs a signal of IKhz to a speech processor. 5. The apparatus of claim 1 or 4, wherein the voice output level detector comprises an integrator for integrating a 1 kHz signal, which is added or subtracted by a predetermined magnitude from the voice processor, a DC level detector for detecting a DC level from a signal output from the integrator, And a memory in which a signal output from the DC level detector is updated and recorded.