KR100575519B1 - Apparatus and method for outputting audio of recording media - Google Patents

Abstract

The present invention relates to an optical output device and method for adjusting an audio volume output to a outside through a speaker regardless of the type of optical disc, in an optical disc device capable of playing two or more optical discs such as a CD or a DVD. According to an aspect of the present invention, an audio output adjusting method in an optical disc apparatus includes: a first step of amplifying and outputting an audio signal read from an optical disc and converted into an analog signal according to a preset gain value; A second step of re-amplifying and outputting the amplified output audio signal according to a preset gain value; A third step of selectively outputting an audio signal amplified and output in the first or second step according to the type of the optical disc inserted; And a fourth step of amplifying the selected output audio signal into an audible audio signal and outputting the audible audio signal to the outside, thereby keeping the sound of the audible sound output through the speaker constant during reproduction of an optical disc having a different audio recording level. Since the present invention is applied to a disc player such as a portable DVD player and the like, it is possible to produce a constant speaker output irrespective of the disc type, and create an effect of listening to high quality music at maximum output.

DVD, CD, Amplifier, Speaker, Volume

Description

Apparatus and method for outputting audio of recording media}             

1 shows an audio output circuit of a typical DVD player,

FIG. 2 illustrates a configuration of an embodiment of an optical disc apparatus, for example, a DVD player, in which an audio output adjusting apparatus according to the present invention is implemented.

Figure 3 shows the flow of an embodiment of the audio output control method in the optical disk apparatus according to the present invention.

※ Explanation of code for main part of drawing

 10: amplifier decoder 20: digital to analog converter

30: amplifier 1 31: amplifier 2

40: buffer 50: audio input / output unit

60: mux 70: micom

80: speaker amplifier 81: speaker

82: earphone

The present invention relates to an optical output device and method for adjusting an audio volume output to a outside through a speaker regardless of the type of optical disc, in an optical disc device capable of playing two or more optical discs such as a CD or a DVD. It is about.

A general DVD player can play a CD as well as a DVD so that a user can listen to audio of a DVD or CD played through the DVD player through a built-in speaker or earphone.

FIG. 1 illustrates an audio output circuit of a general DVD player, and as shown in the figure, an amplifier decoder 10, a digital-to-analog converter 20, an amplifier 30, a buffer 40, and an audio input / output unit ( 50), the mux 60, the microcomputer 70, the speaker amplifier 80, the speaker 81 and the earphone 82 for outputting the output audio signal of the speaker amplifier 80 to the outside.

In the above configuration, the mux 60 selectively outputs an external audio signal input from the audio input / output unit 50 or an audio signal reproduced and output from an inserted optical disc under the control of the microcomputer 70.

The amplifier 30 amplifies and outputs the output audio signal of the DAC 20 according to a preset gain value, and the speaker amplifier 80 corresponds to a volume according to a user's volume control. Amplify and output the audio signal.

1, the playback operation of the DVD player will be briefly described.

First, the amplifier decoder 10 decodes the audio data read from the optical disc in an MPEG method according to a request for a reproduction operation, and the DAC 20 converts the decoded audio data into an analog audio signal. 30 amplifies the converted analog audio signal, and the amplified audio signal is output to the audio input / output unit 50 through the buffer 40. In addition, the amplified audio signal is provided to the input of the speaker amplifier 80 and amplified to correspond to the volume according to the user's volume control, and then externally audible audio through the speaker 81 or the earphone 82. Is output.

As shown in FIG. 1, a typical DVD player is provided with a single amplifier 30 for amplifying the analog audio signal. Once the gain of the single amplifier 30 is set in a circuit configuration, the adjustment is performed later. This was impossible and only the user could manually adjust the output of the speaker amplifier 80 to adjust the volume of the output audio.

As described above, although the audio levels are recorded (or recorded) differently according to the type of the optical disc, the volume of the output audio through the speaker depends on the type of the optical disc. This is different from each other, and thus, even when the user has completed the volume control, there is a troublesome problem of having to perform the volume control again when playing another optical disc.

The present invention has been made to solve the above problems, and by varying the degree of amplification of the reproduced audio signal according to the type of optical disc, the volume of audio output through the speaker to be constant regardless of the type of optical disc The purpose is to provide an audio output control device and a control method.

In order to achieve the above object, an audio output control apparatus in an optical disk apparatus according to the present invention comprises: first amplifying means for amplifying and outputting an audio signal read from an optical disk and converted into an analog signal according to a preset gain value; Second amplifying means for amplifying and outputting the amplified output audio signal according to a preset gain value; Selecting means for selectively outputting any one of a plurality of audio signals respectively input from said first and second amplifying means; And control means for discriminating the type of the inserted optical disc and controlling the signal selection of the selection means in accordance with the determination result.

In addition, the audio output control method in the optical disk apparatus according to the present invention comprises: a first step of amplifying and outputting an audio signal read from the optical disk and converted into an analog signal according to a preset gain value; A second step of re-amplifying and outputting the amplified output audio signal according to a preset gain value; A third step of selectively outputting an audio signal amplified and output in the first or second step according to the type of the optical disc inserted; And a fourth step of amplifying the selected output audio signal into an audible audio signal and outputting the audio signal to the outside.

Hereinafter, an audio output adjusting apparatus and an adjusting method in an optical disk apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating an exemplary embodiment of an optical disk apparatus, for example, a DVD player, in which an audio output adjusting apparatus according to the present invention is implemented. The amplifier includes decoding and outputting audio data read from the optical disk according to an MPEG method. 10; A digital-to-analog converter (DAC) 20 for converting the decoded and output audio data into an analog audio signal; An amplifier 1 30 for amplifying the analog audio signal converted through the DAC 20 according to a preset gain value; An amplifier 2 (31) for amplifying the audio signal amplified by the amplifier 1 (30) to a predetermined size according to a preset gain value; A buffer 40 which buffers the audio signal amplified by the amplifier 1 30 and outputs the audio signal to the audio input / output unit 50; A mux (60) for selectively outputting an output audio signal of the audio input / output unit (50), the amplifier 1 (30) and the amplifier 2 (31) through a switching operation; A speaker amplifier (80) for amplifying the output audio signal of the mux (60) to a volume level set according to a user's volume control to be output to the outside through the speaker (81) or earphone (82); And a microcomputer 70 for determining the type of the inserted optical disc and controlling the switching operation of the mux 60 in accordance with the determination result.

As described above, in the present invention, considering that audio recording levels of both disks are different in DVDs and CDs that can be played in a DVD player, regardless of whether the optical disk inserted into the DVD player is a DVD or a CD, Amplifier 2 (31) was further configured to output audio at a volume corresponding to the volume adjusted by the user.

On the other hand, the amplifier 1 (30) and amplifier 2 (31) has a different gain value, the value is set based on the relative difference of the audio recording level according to the type of optical disk, so that the relatively low audio recording level The volume of the audio signal of the optical disc can be compensated by the amplifier 2 (31).

For reference, the audio recording level of the DVD is 80% of the audio recording level of the CD on the basis of Vrms (effective average voltage).

3 is a flowchart illustrating an embodiment of an audio output adjusting method in an optical disc apparatus according to the present invention. Hereinafter, the audio output adjusting method of FIG. 3 will be described in detail with the operation of the apparatus of FIG. 2.

First, the microcomputer 70 determines the type of the inserted optical disk (S10), and the optical disk can be implemented by a general publicly known technique for distinguishing a DVD from a CD, and thus a detailed description thereof will be omitted.

On the other hand, in response to a request for playback operation (S20), the amplifier decoder 10 converts the digital audio data read from the optical disc into the DAC 20 and converts the digital audio data read from the inserted optical disc into an analog audio signal (S21). The amplifier 1 30 amplifies the converted analog audio signal according to a preset gain value (S22), and the amplified audio signal is output to the audio input / output unit 50 through the buffer 40. do.

In addition, the amplified audio signal is respectively input to the amplifier 2 (31) and the mux (60), the amplifier 2 (31) receives the audio signal amplified by the amplifier 1 (30) according to a preset gain value Re-amplification (S23) and outputs it to the mux (60).

Accordingly, output signals of the audio input / output unit 50, amplifier 1 30, and amplifier 2 31 are provided as input signals of the mux 60, respectively, and the mux 60 is the microcomputer 70. The input signal is selectively output through a switching operation according to the control of (S24). If the optical disc into which the microcomputer 70 is inserted is determined as a CD, the microcomputer 70 according to the control of the microcomputer 70 according to the control The mux 60 selects and outputs an audio signal provided from the amplifier 1 30 among the input audio signals.

However, in the case where the optical disc into which the microcomputer 70 is inserted is determined as a DVD, the mux 60 is controlled by the microcomputer 70 according to the control of the microcomputer 70. Selectively output the audio signal provided from the

Meanwhile, the speaker amplifier 80 amplifies the audio signal selected and output from the mux 60 to correspond to the volume set by the user through volume control, and then the speaker 81 or the earphone 82. External output through the audio sound through the sound (S25).

As described above, in the present invention, the amplification degree of the reproduced audio signal is varied according to the type of optical disc in consideration of the fact that the recording level of the audio signal is different according to the type of optical disc. You will get the same size audio output.

The above-described preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve, change, and substitute various other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims below. Or addition may be possible.

As described in detail above, according to the audio output adjusting apparatus and the adjusting method in the optical disk apparatus according to the present invention, it is possible to maintain the sound of the audible sound output through the speaker at the time of playing the optical disk having different audio recording levels, Applied to a disc playback device such as a portable DVD player, it is possible to produce a constant speaker output regardless of the type of disc, and to listen to high-quality music at the maximum output.

Claims (6)

In a device capable of reproducing two or more optical discs, First amplifying means for amplifying and outputting the audio signal read from the optical disc and converted into an analog signal according to a preset gain value; Second amplifying means for amplifying and outputting the amplified output audio signal according to a preset gain value; Selecting means for selectively outputting any one of a plurality of audio signals respectively input from said first and second amplifying means; And And control means for discriminating the type of the optical disc inserted and controlling the signal selection of the selection means in accordance with the determination result. The method of claim 1, And said first and second amplifying means have different gain values, the values of which are set based on a relative difference of audio recording levels according to optical disc types. The method of claim 1, The control means selects and outputs an audio signal input from the first amplifying means when the determination result is a CD, and outputs an audio signal input from the second amplification means when the determination result is a DVD. An audio output control apparatus in an optical disc apparatus, characterized in that for controlling the selection means. The method of claim 1, Audio output control in the optical disk device, characterized in that it further comprises a speaker amplifying means for amplifying the audio signal output from the selection means corresponding to the volume set by the user through the volume control and output through the speaker or earphone Device. In the method of playing two or more optical discs through a single playback device, A first step of amplifying and outputting an audio signal read from the optical disc and converted into an analog signal according to a preset gain value; A second step of re-amplifying and outputting the amplified output audio signal according to a preset gain value; A third step of selectively outputting an audio signal amplified and output in the first or second step according to the type of the optical disc inserted; And And a fourth step of amplifying the selected output audio signal into an audible audio signal and outputting the audio signal to the outside. The method of claim 5, The fourth step, the audio output control method of the optical disk device, characterized in that for amplifying and outputting the selected audio signal corresponding to the volume set by the user through the volume control.

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