KR20030090364A - System and method of automatically compensating a audio signal of a television - Google Patents

Abstract

The present invention relates to a device for automatically correcting an audio signal in a television. An apparatus for automatically adjusting a voice signal according to the present invention includes a voice processor, a voice amplifier, a microcomputer, a comparator and a level adjuster. The microcomputer stores the output level of the voice signal output from the voice processor for the current channel in an internal register and checks whether a channel change signal is input. When the channel change signal is input from the micom, the comparison unit compares the output level of the pre-changed voice signal with the output level of the voice signal of the post-change channel. As a result of the comparison, if the output level of the audio signal of the channel after the change does not match the output level of the channel before the change, the level adjusting unit adjusts the output level of the voice signal for the channel after the change.

According to the present invention, even if the user changes the channel, the user can always watch the television at a constant volume without a separate volume adjustment.

Description

Automatically correcting audio signal in video display device and its method {SYSTEM AND METHOD OF AUTOMATICALLY COMPENSATING A AUDIO SIGNAL OF A TELEVISION}

The present invention relates to an apparatus for automatically adjusting an audio signal in a television, and more particularly, to an apparatus for automatically adjusting an output level of an audio signal of a channel after a change when a channel is changed in a television to which multiple channels are input. It is about.

1 is a block diagram schematically showing the internal configuration of a conventional television. Referring to FIG. 1, broadcast signals of various channels broadcast from each broadcasting station are input to the tuner unit 100 of a television. The broadcast signal for the predetermined broadcast frequency tuned by the tuner unit 100 separates the video signal and the audio signal, and the video signal is transmitted to the panel 130 through the video processor 110 and the scaler 120. The image is displayed as an image, and the audio signal is output to the speaker 160 through the audio processor 140 and the audio amplifier 150.

Looking at the processing of the voice signal in more detail, the voice signal of the broadcast signal propagated from each broadcasting station is output as an analog signal through the voice processing unit 140, the analog converted voice signal has a constant gain (gain) It is amplified by the voice amplification unit 150 having the output from the speaker 160.

At this time, since the audio signals input from the respective broadcasting stations have different input levels, a difference occurs in the output level of the audio signal output from the voice processing unit for each channel. As a result, whenever the user changes the channel, it is inconvenient to readjust the volume to optimize the level of the voice signal for each channel. In addition, the viewer may be surprised as the magnitude of the audio signal output to the speaker suddenly increases when the channel is changed.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic audio signal adjusting device and a method for automatically outputting an audio signal of a constant size without a separate volume adjustment process by automatically adjusting the size of the audio signal when changing a channel of a television.

1 is a block diagram schematically showing the internal configuration of a conventional television;

2 is a view showing video and audio signals input for each channel of a television.

Figure 3 is a block diagram showing the configuration of the automatic audio signal correction apparatus according to an embodiment of the present invention.

Figure 4 is a block diagram showing the configuration of an automatic audio signal correction apparatus according to another embodiment of the present invention.

5 is a waveform diagram illustrating a process of setting an output level for a voice signal according to the present invention;

<Explanation of symbols for the main parts of the drawings>

100, 300: Tuner part

110, 310: Video Processor

120, 320: Scaler

130, 230: Panel

140, 340: audio processor

150, 350: voice amplifier

160, 360: Speaker

370: micom

342: comparison unit

344: level adjustment unit

346: average value measuring unit

An apparatus for automatically adjusting a voice signal according to the present invention for achieving the above object includes a voice processor for converting a voice signal input from the outside into an analog signal, and a voice signal input from the voice processor with a predetermined amplification rate. An audio signal automatic adjusting device in a video display device having an audio amplifying unit for amplifying and outputting the audio signal, comprising: storing an output level of an audio signal output from the audio processing unit for a current channel in an internal register and inputting a channel change signal; A microcomputer to check whether a channel change signal is input from the microcomputer, and a comparison unit comparing the output level of the audio signal with respect to the pre-changed channel with the output level of the audio signal with respect to the channel after the change, and the comparison unit. According to the result, the level of the voice signal output from the voice processor is adjusted. It characterized in that it includes a level controller.

More preferably, the apparatus for automatically adjusting an audio signal further includes an average measuring unit between the audio processing unit and the comparing unit, and the average value measuring unit is configured to at least output an output level of the audio signal for the changed channel output from the audio processing unit. Detects one or more times, sums output levels of the detected voice signals, obtains an average value for the summed output levels, and the comparator compares the average value obtained by the average value measurer with the prestored voice signal for the previously changed channel. It is a good idea to compare the output levels.

On the other hand, the automatic audio signal adjusting method in the image display apparatus according to the present invention comprises the steps of storing the output level for the audio signal output from the audio processing unit, detecting whether the channel has been changed, and, if the channel If this is changed, comparing the output level of the audio signal of the channel after the change and the output level of the pre-stored voice signal of the channel before the change output from the voice processing unit, and the voice of the channel after the change in the comparison step And if the output level of the signal does not match the previously stored output level of the pre-change voice signal, adjusting the output level of the voice signal for the post-change channel.

At this time, the step of storing the output level for the voice signal includes (a) dividing the range of the maximum value of the voice data output from the speaker to 0 by the number of steps of external volume adjustment; Preferably, the step comprises determining a corresponding step as an output level, and (c) storing the determined output level.

According to the present invention, even if the user changes the channel, the user can always watch the television at a constant volume without a separate volume adjustment.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the automatic voice signal adjusting apparatus according to the present invention.

3 is a block diagram illustrating an apparatus for automatically adjusting a voice signal according to an embodiment of the present invention. Hereinafter, with reference to FIG. 3, the structure of the audio signal automatic adjustment apparatus which concerns on a present Example is demonstrated. The description of the components having the same functions as the above-described conventional components is omitted.

First, the apparatus for automatically adjusting a voice signal further includes a microcomputer 370, a comparator 342, and a level adjuster 344 between the voice processor 340 and the voice amplifier 350.

First, the microcomputer 370 is connected to the voice processor 340 to continuously exchange data with the voice processor 340, and outputs a step of an output level of the voice signal of the current channel to a specific register in the microcomputer. We will save it and store its value. On the other hand, the microcomputer 370 continuously checks whether a channel change signal is input from the outside.

On the other hand, the voice processing unit 340 is connected to the tuner 300, a voice signal is input from the tuner 300. The comparator 342 has an input terminal connected to the voice processor 340 and the microcomputer 370, and an output terminal thereof connected to the input terminal of the level adjuster 344. The output terminal of the level adjusting unit 344 connected to the output terminal of the comparing unit 342 is connected to the voice amplifier 350.

The operation of the automatic audio signal adjusting device having the above-described configuration will be described below.

First, when a user sets a desired optimal volume value through a key input unit (not shown), the microcomputer 370 outputs from the voice processor 340 in the current channel according to the set volume value. The output level for the voice signal to be stored is stored in a specific register in the microcomputer 370. At this time, the output level for the voice signal stored in the microcomputer 370 is determined as follows. First, the range of 0 to the maximum output value for the speaker is divided by the number of steps of the external volume control switch, and the step corresponding to the voice signal output from the voice processor 340 is set as an output level, and this is set in the microcomputer 370. It is stored in a specific register.

Next, the microcomputer 370 continuously checks whether a channel change signal is input from the outside. If the channel change signal is detected, the micom 370 outputs the output level of the audio signal of the channel before the change previously stored in the microcomputer 370. Input it to the comparator.

When the microcomputer 370 detects that the channel change signal is input, the comparator 342 outputs an output level of the audio signal for the pre-stored pre-change channel input from the microcomputer 370 and the voice processor 340. Compare the output levels of the audio signals for the channels after the input changes. That is, the comparison unit 342 compares the output level of the audio signal for the pre-stored pre-change channel and the output level of the voice signal for the post-change channel, respectively, input from the microcomputer 370 and the voice processing unit 340. The difference value is output to the level adjusting unit 344.

As a result of the comparison of the comparator 342, if the output level of the audio signal for the post-change channel does not coincide with the pre-stored output level of the audio signal for the pre-change channel, the level adjusting unit 344 is configured for the post-change channel. The output level of the voice signal output from the voice processor is adjusted. That is, the level adjusting unit 344 adjusts the output level of the voice signal for the changed channel output from the voice processing unit according to the comparison result of the comparing unit 342.

Hereinafter, another embodiment of an automatic audio signal correcting apparatus according to the present invention will be described with reference to FIG. 4. Description of components that overlap with those in the above embodiments will be omitted.

As shown in FIG. 4, the apparatus for automatically correcting a voice signal according to the present exemplary embodiment further includes an average value measurer 346 between the voice processor 340 and the comparator 342. The average value measuring unit 346 receives the output level of the voice signal from the voice processing unit 340, detects the output level of the voice signal for the channel after the change for a predetermined number of times, and detects the output level of the predetermined number of times. S are summed, and the mean of the sum is calculated. The average value is output to the input terminal of the comparator 342.

Meanwhile, the comparison unit 342 calculates the output level of the audio signal of the pre-change channel previously stored from the microcomputer 370 and the output levels of the audio signal of the post-change channel from the average measurement unit. Are input respectively.

The operation of the automatic audio signal adjusting device having the above-described configuration will be described below.

The microcomputer 370 continuously stores the output levels of the audio signal output from the voice processor 340 for the current channel in a specific register in the microcomputer 370, and continuously determines whether a channel change signal is input from the outside. Check it.

If the microcomputer 370 detects the channel change signal, the average value measurer 346 detects the output level of the voice signal output to the channel after the change from the voice processor 340 at least once and sums them up, The mean value is calculated for the summed values. The average value thus obtained is used as an input signal of the comparator 342.

Next, the comparison unit 342 calculates an average value of the output level of the voice preference of the pre-change channel and the output level of the voice signal of the post-change channel from the micom 370 and the average value measuring unit 346. Receive each input. As a result of the comparison of the comparison unit 342, if the average value of the output level of the audio signal of the channel after the change does not coincide with the output level of the voice signal of the channel before the change, the level adjusting unit 344 determines the difference value. According to the change, the output level of the audio signal for the channel is adjusted.

According to the present embodiment, even when the signal input from the newly changed channel is severely changed in the level of the voice signal such as music, the output level of the voice signal can be automatically adjusted very effectively. That is, music with a severe level change cannot be sufficiently leveled through a one-time compensation process, and after detecting and summing the output levels of the voice signal input for the first about 7-8 seconds several times after the channel change, the average value is calculated from this. The calculated average value is used to automatically adjust the output level of the audio signal.

According to the present invention, in an image display apparatus such as a television, the output level for an audio signal can be automatically corrected even if the channel is changed.

Claims (5)

An audio signal automatic adjustment in a video display device including a voice processing unit for converting and outputting an audio signal input from the outside into an analog signal, and a voice amplifier for amplifying and outputting the audio signal input from the voice processing unit with a predetermined amplification rate. In the apparatus, A microcomputer storing an output level of a voice signal output from the voice processor for a current channel in an internal register and checking whether a channel change signal is input; A comparison unit comparing the output level of the audio signal with respect to the pre-changed channel with the output level of the audio signal with respect to the channel after the change when the channel change signal is input from the micom; A level adjusting unit for adjusting the output level of the audio signal output from the voice processing unit for the changed channel according to the comparison result of the comparing unit Automatically adjusting the audio signal in the video display device characterized in that it comprises a. The apparatus of claim 1, wherein the apparatus for automatically adjusting an audio signal further comprises an average measuring unit between the audio processing unit and the comparing unit, wherein the average value measuring unit is configured to adjust an output level of the audio signal for the changed channel output from the audio processing unit. Detecting at least one time, summing output levels of the detected voice signals, and calculating an average value of the summed output levels; And the comparing unit compares an average value obtained by the average measuring unit with an output level of the audio signal for the previously stored channel. In the audio signal automatic adjustment method in a video display device including a sound processor, a voice amplifier, and a microcomputer, Storing an output level of the voice signal output from the voice processor; Detecting whether the channel has changed; If the channel is changed, comparing the output level of the voice signal of the channel after the change output from the voice processor with the output level of the pre-changed voice signal of the previously changed channel; In the comparing step, adjusting the output level of the audio signal for the channel after the change if the output level of the audio signal of the channel after the change does not match the output level for the pre-changed voice signal. Automatically adjusting the audio signal in the video display device characterized in that it comprises a. 4. The method of claim 3, wherein the storing of the output level of the voice signal comprises: (a) dividing the range of the maximum value of the voice data output from the speaker to 0 by the number of steps of external volume adjustment; And determining a step corresponding to the audio signal as an output level for the audio signal, and (c) storing the determined output level. In the audio signal automatic adjustment method in a video display device including a sound processor, a voice amplifier, and a microcomputer, Storing an output level of the voice signal output from the voice processor; Detecting whether the channel has changed; If the channel is changed, detecting the output level of the audio signal for the channel after the change at least once, summing the output levels of the detected voice signal at least once, and obtaining an average value of the summed values; Wow, Comparing the average value obtained with respect to the voice signal of the channel after the change with the output level of the voice signal of the pre-change channel previously stored; Adjusting the output level of the audio signal for the channel after the change if the average value of the voice signal of the channel after the change does not match the output level for the pre-stored voice signal as a result of the comparison in the comparing step Automatically adjusting the audio signal in the video display device characterized in that it comprises a.