KR19990000623A - How to restore audio player's audio channel reverse - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Disc player

2. Technical problem to be solved by the invention

In a conventional video disc player, a problem of inversion of an audio output channel in a speaker caused by a difference between the data format of a data bus provided in a decoder and the format of a data bus provided between a decoder and an audio device is solved.

3. Summary of Solution to Invention

In the audio output channel inversion recovery method of a video disc player,

A first step (ST1-ST3) of reading information about the disk (TOC) and setting a flag register for selecting channel data in the audio device to restore the output channel inversion of the audio data in the case of a video disk;

Check whether the flag register is set, and if the test result is set, convert the digital data into analog data, and if the test result is not set, restore the output channel inversion of the audio data to the value of the flag register that selects the channel data. It is characterized in that it comprises a second step (ST4-ST6) for converting the digital data into analog data after changing to a set value.

4. Important uses of the invention

This is applied to reverse recovery of the audio output channel of a disc player that plays a video compact disc or an audio compact disc.

Description

How to restore audio player's audio channel reverse

When playing a disc in a general video disc player, the disc information (TOC) is first read and then played.

Such a general video disc player includes a decoder 1 for decoding a signal recorded in an MPEG (MPEC) method on a video disc, and audio data among the signals decoded by the decoder 1, as shown in FIG. Outputs a sound device 2, a digital to analog converter 3 for converting a digital signal through the sound device 2 into an analog signal, and an analog signal output from the digital to analog converter 3; A speaker 4 was provided.

In this case, the data bus implemented in the decoder 1 supports the Sony format, and the data bus (I2S data bus) that transfers data between the blocks supports the Philips format.

The operation of a general video disc player configured as described above is as follows.

First, light is projected onto the disk, and the optical signal reflected from the disk is converted into data and then amplified to a predetermined level. Then, the error of the amplified data is corrected, and the error corrected data is transmitted to the decoder 1 in accordance with the word clock provided to synchronize the data in word units. At this time, since the data bus that delivers data to the decoder 1 supports the PHILIPS format, if the word clock is in a high signal state, it transfers the left channel data, and if the word clock is a low signal, it is right. Pass channel data. 2B shows a timing diagram of only the raft channel data transferred to the decoder 1 in synchronization with a word clock. The decoder 1 then decodes the received raft channel data when the word clock is a high signal, and outputs the decoded data through the data bus that is implemented in the decoder 1 and supports the Sony format. In addition, the decoder 1 decodes the received light channel data when the word clock is a low signal and outputs the data through a data bus that supports the Sony format when the word clock is a high signal.

Thus, as shown in (c) of FIG. 2A, the acoustic apparatus 12 receives the raft channel data when the word clock is a low signal, and inverts the write channel data when the word clock is a high signal. Then, the audio device 12 receives the audio data in which the channels are inverted, and outputs the audio data to the digital / analog converter 3 again through a data bus (I2S data bus) supporting the Philips format.

Accordingly, the digital-to-analog converter 3 converts the digital data into analog data and transmits the analog data to the speaker 4. Thus, the raft channel in the speaker 4 hears the sound of the light channel, and in the light channel, the sound of the raft channel is heard.

Therefore, such a conventional video disc player has a problem in that the sound of the speaker is changed in the channel due to the difference in the formats supported by the data bus provided in the decoder and the data bus for transferring data from the decoder to the audio device.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to set a register value for selecting an audio output channel in a video disc player, and then output a sound to an audio output terminal. An object of the present invention is to provide a method of recovering an audio output channel inversion of a disc player, which prevents inversion of an output channel.

A method for achieving this object of the present invention;

A first step of reading information about the disc and setting a flag register for selecting channel data in the audio device to restore the output channel inversion of the audio data, if the disc is a video disc; Check whether the flag register is set, and if the test result is set, convert the digital data into analog data. If the test result is not set, the value of the flag register for selecting channel data is restored so that the output channel inversion of the audio data is restored. After changing to a set value, a second step of converting digital data into analog data is performed.

Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

1 is a block diagram of a conventional disc player;

2 (A) is a timing diagram of a left channel signal output from a conventional disc player.

(B) is a timing diagram of a raft channel signal to be normally output from a conventional disc player,

3 is a flowchart illustrating a method of recovering an audio output channel inversion of a disc player according to the present invention;

4 is a block diagram of a disc player to which the present invention is applied;

5A is a timing diagram of a left channel signal output after being inverted before restoring the inversion of an audio output channel.

(B) is a timing diagram of the raft channel signal after restoring the inversion of the audio output channel.

Explanation of symbols on the main parts of the drawings

10 decoder 11 ROM

12: sound device 13: digital to analog converter

14: Speaker

3 is a flowchart illustrating a method of recovering an audio output channel inversion of a disc player according to the present invention.

As shown, the first step of reading the information (TOC) from the disk and setting the flag register for selecting the channel data in the audio device to restore the output channel inversion of the audio data in the case of a video disk (ST1-). ST3); Check whether the flag register is set, and if the test result is set, convert the digital data into analog data, and if the test result is not set, restore the output channel inversion of the audio data to the value of the flag register that selects the channel data. After changing to a set value, a second step (ST4-ST6) converts digital data into analog data.

4 is a block diagram of a video disk player to which the present invention is applied.

As shown in the figure, a decoder 10 for decoding a signal recorded in an MPEG (MPEC) method on a video disc, and a ROM 11 for storing a value set to output a signal decoded from the decoder 10 through a normal channel. And a sound device 12 which sets a flag register to a value of the flag register drawn out from the ROM 11 to prevent the data received from the decoder 10 from being outputted due to channel inversion, and the sound device And a digital / analog converter 13 for converting the digital signal through the analog signal into an analog signal, and a speaker 14 for outputting the analog signal output from the digital / analog converter 13.

As described above, the operation of the video disc player to which the present invention is applied is as follows.

First, light is projected onto the disk to read information on the disk (TOC) (ST1). If it is determined that the video disc is read, the system controller extracts the flag register value from the ROM 11 and sets the flag register in the audio device 12 (ST2-ST3). Then, if it is determined that the flag register has been set, and it is determined that the setting is made, the acoustic apparatus 12 determines that the word clock from the decoder 10 is high by the set flag register as shown in Fig. 5B (d). The output raft channel data is transmitted to the digital / analog converter 13 when the word clock is a high signal. At the same time, the audio device 12 transmits the write channel data outputted from the decoder 10 when the word clock is low by the set flag register to the digital / analog converter 13 when the word clock is low (ST6). ).

Then, the digital-to-analog converter 13 converts the raft channel data received when the word clock is a high signal into analog data and outputs it through the raft channel of the speaker 14. At the same time, the digital / analog converter 13 converts the light channel data received when the word clock is a low signal into analog data and outputs the analog channel to the light channel of the speaker 14.

On the other hand, if it is determined that the flag register is not set, the sound device 12 changes the value of the flag register so that the output channel data is changed and selected (ST5). Thus, by the flag register having the changed value, the acoustic apparatus 12 selects the raft channel data output when the word clock is a low signal from the decoder 11 to be output to the write channel and outputs the digital channel to the analog / analog converter 13. . Accordingly, the digital-to-analog converter 13 receives the write channel data and converts it into analog data when the word clock is a low signal. Thus, the light channel data converted into analog data is output to the light channel of the speaker 14.

At the same time, the sound device 12 outputs the raft channel data when the word clock is a high signal in the same way that the write signal is output when the word clock is a low signal by a flag register having a changed value. Thus, although the format schemes supported by the data bus implemented in the decoder 11 and the data bus implemented between the decoder 11 and the audio device 12 are different, the light channel in the speaker 14 receives light channel data. In the raft channel, the raft channel data is heard.

As described above, in the present invention, although the format method supported by the data bus implemented in the decoder and the data bus implemented between the decoder and the audio device is different, a flag register for selecting and outputting channel data in the audio device is set. This setting has the effect of outputting the light channel data in the light channel in the speaker and the raft channel data in the raft channel.

According to the present invention, an audio output channel of a disc player which prevents inversion of an output channel caused by a difference in data transmission format by setting a value of a register for selecting an audio output channel in a video disc player and then outputting sound to an audio output terminal. It is to provide a reverse recovery method.

Claims (1)

In the audio output channel inversion recovery method of a video disc player, A first step (ST1-ST3) of reading information about the disk (TOC) and setting a flag register for selecting channel data in the audio device to restore the output channel inversion of the audio data in the case of a video disk; Check whether the flag register is set, and if the test result is set, convert the digital data into analog data, and if the test result is not set, restore the output channel inversion of the audio data to the value of the flag register that selects the channel data. And a second step (ST4-ST6) of converting digital data into analog data after changing to a set value.