KR980011279A - An audio signal processing device of an optical disk player - Google Patents

Abstract

The present invention relates to an audio signal processing apparatus for an optical disk player and includes a key input unit 40, a microcomputer 50, an audio digital / analog (D / A) converter 79, a switching unit 81, An OR gate 82, an inverter 83, first, second, third and fourth mute portions 84, 85, 86 and 87 and first and second audio signal amplifying / compensating portions 88 and 89 An audio signal reproduced from the optical disc player and an audio signal input through the external input means can be output in a desired format.

Selectivity 2

Description

An audio signal processing device of an optical disk player

1 is a schematic block diagram of a general optical disc player;

2 is a block diagram of an apparatus for processing an audio signal of an optical disk player according to a preferred embodiment of the present invention.

FIG. 3 is a diagram for explaining an audio output signal according to the switching control signal of the microcomputer shown in FIGS. 1 and 2. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

10: pick-up and actuator unit 20: RF signal amplification and servo signal processing unit

30: motor drive unit 40: key input unit

50: Microcomputer 60: Digital signal processor

70: MPEG decoder 80: Audio signal processor

79: Audio D / A converter 81:

82: OR gate 83: Inverter

84, 85, 86, 87: mute unit 88, 89: audio signal amplifying /

90: Video signal processing unit 100: Speaker

110: Screen

The present invention relates to an audio signal processing apparatus for an optical disc player, and more particularly to an audio signal processing apparatus and method for an audio signal processing apparatus for an optical disc player capable of arbitrarily setting output of a stereo audio signal composed of audio signals of L and R channels, ≪ / RTI >

As audio and video media evolve, optical disc players have been developed that can reproduce audio and audio signals recorded on a 12 cm semi-permanent optical disc.

Such optical disc players include compact disc players (CDPs), laser disc players (LDPs) and compact disc graphic players (CDGPs), video compact disc players (VCDPs: video a compact disk player, a compact disk player, and a video compact disk player are devices capable of reproducing video and audio at the same time.

In recent years, a digital video disk (DVD) using MPEG-2 moving picture compression technology has been developed. This is because a gigabyte (GB) capacity Data can be recorded and reproduced, and there is a trend to continue to improve the performance thereof.

On the other hand, such optical disk reproducing apparatus reproduces video and / or audio recorded on an optical disk and outputs the reproduced video and / or audio through a screen and / or a speaker, and has a higher signal-to- It is possible to reproduce a signal with image quality and / or sound quality, to generate no noise due to irregular reproduction and modulation, to have very few distortion, to have no ghost, and to have random access, And it is in a trend of spreading widely.

1 is a schematic block diagram of a general optical disc player described above.

1, a general optical disc player includes a pickup and actuator unit 10, a radio frequency (RF) signal amplification and servo signal processing unit 20, a motor driving unit 30, a key input unit 40, a microcomputer A digital signal processing unit 60, an MPEG decoder 70, an audio signal processing unit 80, a video signal processing unit 90, a speaker 100, and a screen 110.

The pickup and actuator unit 10 executes an optical pickup from a disk loaded in a disk tray (not shown) and outputs an RF signal read out.

The motor driving unit 30 drives a spindle motor (not shown) to rotate the disc and actuate the actuator unit 10 so that the pickup unit 10 executes the optical pickup to read data recorded on the disc, Signal.

The RF signal amplification and servo signal processing section 20 amplifies the RF signal provided from the pickup and actuator section 10 and also provides a servo control signal according to the signal to the motor driving section so as to perform focus servo and tracking servo.

The digital signal processing unit 60 processes the RF signal amplified and amplified RF signal provided from the servo signal processing unit 20, performs digital signal processing, performs error detection and error correction, and outputs the error signal to the MPEG decoder 70.

The MPEG decoder 70 decodes the error corrected digital video signal and the audio signal provided from the digital signal processing unit 60 based on the MPEG compression format and outputs the decoded digital video signal and audio signal to the video signal processing unit 90 and the audio signal processing unit 80 .

The audio signal processing unit 80 and the video signal processing unit 90 process the decoded audio and video signals provided from the MPEG decoder 70 and output them to the speaker 100 and the screen 110 respectively, And the screen 110 are respectively outputted as a voice and displayed as an image.

Meanwhile, the audio signal processor 80 of the optical disk player, in general, is an audio signal reproduced from an optical disk is a stereo signal of L and R channels. Therefore, each channel signal is subjected to audio signal processing, And an R speaker.

Among the functions of the above-mentioned optical disc player, there is a song accompaniment function which reproduces the accompaniment of a song desired by the user, mixes the audio signal of the user inputted by the user through the external audio input means such as a microphone, .

That is, an audio signal to be reproduced, that is, a song accompaniment audio signal and an audio signal input by a user are combined and output through two channels of L and R. Conventionally, the user can not arbitrarily set such an output channel, The user can not listen to the audio output signal of the form, and it is very inconvenient for the user to set the audio output signal of the desired type in other cases as well as in the song accompaniment function.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an optical disc player capable of easily setting an output format of an audio signal to a desired format and listening to a desired audio signal, And an audio signal processing apparatus.

According to another aspect of the present invention, there is provided a method of controlling an audio signal output apparatus, the method comprising the steps of: selecting a desired audio signal output by a user based on a switching control signal output by a microcomputer according to an audio signal output selection key signal input through a key input unit; An apparatus for processing an audio signal of an optical disc player, comprising: an L and R channel stereo digital audio signal reproduced from an optical disc and input through a predetermined process; and a digital audio signal input from the outside into an analog audio signal, And an analog audio signal, which is switched according to the switching control signal of the microcomputer and is output from the audio digital-to-analog converter, through the L and R output terminals, Boo, the phase An inverter for inverting and outputting the output signal of the OR gate; and an AND gate for inverting the output signal of the OR gate through the L and R output terminals of the switching unit according to an output signal of the inverter A first mute unit for mute and mute an audio signal, respectively, and an audio signal provided through the L and R output terminals of the audio digital / analog converter according to an output signal of the OR gate, And a third audio signal amplifying / compensating unit for amplifying and compensating an audio signal provided through the first or third mute unit and outputting the amplified audio signal, and a second audio signal amplifying / And a second audio signal amplifying / compensating unit for amplifying and compensating the audio signal provided through the second audio signal amplifying / compensating unit.

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

2 is a block diagram of an apparatus for processing an audio signal of an optical disc player according to a preferred embodiment of the present invention. The apparatus includes a key input unit 40, a microcomputer 50, an audio / digital (A / D) The first and second audio signal amplifying / amplifying units 79, 85, 86 and 87, the switching unit 81, the OR gate 82, the inverter 83, And compensation sections (88, 89).

The audio D / A converter 79 converts L and R channel audio signals reproduced from the optical disc, or digital audio signals inputted through external input means such as a microphone (not shown) And an R output terminal to the switching unit 81.

The key input unit 40 provides a key signal for acquiring an audio output signal of a desired form to the microcomputer 50 and can be configured by adding an audio output selection key (not shown) to a normal key input unit have.

The microcomputer 50 provides a switching control signal corresponding to the audio output selection key signal provided from the key input unit 40 as a high or low logic signal to the selection signal input terminals A and B of the switching unit 81, The operation of the switching unit 81 and the first to fourth mute units 84, 85, 86 and 87 according to the switching control signal of the microcomputer 50 will be described with reference to FIG.

A high or low logic signal, that is, a two-bit switching control signal output from the microcomputer 50 is provided to the selection signal input terminals A and B and the OR gate 83 of the switching unit 81. [

First, when all of the low signals are supplied from the microcomputer 50 to the selection signal input terminals A and B of the switching unit 81, the output switch C and the output switch D of the switching unit 81 Is connected to the input terminal (Ai) and the input terminal (Bi) of the switching unit (81). At the same time, the OR gate outputs a low signal to the inverter 83 and the third and fourth mute units 86 and 87 since only the low signal is provided from the microcomputer 50.

On the other hand, the first to fourth mute portions 84, 85, 86, and 87 are all configured to perform the mute function when the high signal is provided and to release the mute if the low signal is provided.

Therefore, when all of the low signals are supplied from the microcomputer 50, the third and fourth mute portions 86 are brought into the unmute state according to the low signal provided from the OR gate 82, The signals 84 and 85 are turned on by the high signal provided through the inverter 83 so that the signal supplied from the switching unit 81 in this case is outputted to the first and second mute units 84 and 85 And the signals output from the L and R output terminals of the audio D / A converter 79 through the third and fourth mute portions 86 and 87 are muted in the first and second audio signal amplification / And the first and second audio signal amplifying / compensating units 88 and 89 are provided with the audio signals of the L and R channels provided through the third and fourth mute units 86 and 87 Amplified and error-compensated to output to respective speakers. In other words, when only the low signal is outputted from the microcomputer 50, the user inputs an output selection key signal for normally processing the stereo signal. In this case, in the present invention, The bypassed audio signal is output to improve the output characteristic.

When the low signal is supplied to the input terminal A of the switching unit 81 from the microcomputer 50 and the high signal is supplied to the input terminal B, the switch C and the switch D are connected to the audio signal input terminal (Ai) and an audio signal input terminal (Bh). In this case, both of the output terminals Lout and Rout of the switching unit 81 output the audio signal of the L channel provided from the L output terminal of the audio D / A converter 79. At the same time, the OR gate 82 outputs a high signal because the low and high signals are provided from the microcomputer 50, so that the third and fourth mute portions 86 and 87 are in an audio signal mute state. The second mute units 84 and 85 receive the inverted low signal from the inverter 83 so that the second mute units 84 and 85 are brought into the unmute state and output the audio signals provided from the output terminals Lout and Rout of the switching unit 81 to the first and 2 audio signal amplifying / compensating units 88 and 89, respectively. On the other hand, the first and second audio signal amplifying / compensating unit 88 operate as described above.

When the high signal is supplied to the input terminal A of the switching unit 81 and the low signal is supplied to the input terminal B from the microcomputer 50, the switch C is switched to the audio signal input terminal Ah, And the switch D is connected to the audio signal input terminal BL so that the switching unit 81 outputs only the signal of the R channel provided through the R output terminal of the audio D / A converter 79 . The first through fourth mute portions 84, 85, 86, and 87 are the same as the case where the low signal is supplied from the microcomputer 50 to the input terminal A and the high signal is supplied to the input terminal B Lt; / RTI >

In the case where only a high signal is provided from the microcomputer 50, that is, when a high signal is provided to both the input terminal A and the input terminal B, the switch C of the switching unit 81 Is connected to the input terminal Ah,

The switch D is connected to the input terminal Bh. Therefore, in this case, the output terminal Lout of the switching unit 81 outputs the audio signal of the R channel, and the output terminal Rout outputs the audio signal of the L channel. That is, the signals of the L and R channels are outputted through the output terminal opposite to the original output terminal, so that the audio signal of the R channel is transmitted to the L speaker (not shown), and the L The audio signal of the channel is transmitted.

In this case, as described above, the first and second mute portions 84 and 85 are brought into the unmute state by the low signal provided through the OR gate 82 and the inverter 83, 4 mute portions 86 and 87 are muted by the high signal provided from the OR gate 82 to mute the audio signals of the L and R channels provided from the audio D / A converter 79. [

Therefore, the present invention is advantageous in that an audio signal reproduced in an optical disc player and an audio signal input through an external input means can be output in a desired form.

While the present invention has been particularly shown and described with reference to certain preferred embodiments thereof, those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the following claims.

Claims (1)

The audio signal processing apparatus of the optical disc player for selecting a desired audio signal output by the switching control signal outputted from the microcomputer 50 according to the audio signal output selection key signal inputted through the key input unit 40 Which converts L and R channel stereo digital audio signals reproduced from an optical disc and input through a predetermined process and digital audio signals inputted from the outside into analog audio signals and outputs them through the L and R output terminals, A digital / analog converter 79; A switching unit 81 which is switched according to the switching control signal of the microcomputer 50 to select an analog audio signal provided from the audio digital-to-analog converter 79 and output through the output terminals Lout and Rout, ; An OR gate 82 for performing an OR operation on the switching control signal of the microcomputer 50 and outputting the result; An inverter 83 for inverting and outputting the output signal of the OR gate; First and second mute units 84 and 82 for mute and mute audio signals provided through the output terminals Lout and Rout of the switching unit 81 according to the output signal of the inverter 83, 85); And third and fourth mute units 86 and 87 for muting and muting the audio signals provided through the L and R output terminals of the audio digital-to-analog converter 79 according to the output signal of the OR gate 82, respectively. )Wow; A first audio signal amplifying / compensating unit 88 amplifying and compensating the audio signal provided through the first or third mute unit 84 or 86 and outputting the amplified audio signal; And a second audio signal amplifying / compensating unit (89) for amplifying and compensating the audio signal provided through the second or fourth mute unit (85, 87) and outputting the amplified audio signal. ※ Note: It is disclosed by the contents of the first application.