KR20030067250A - Apparatus and Method for outputting audio of recording media - Google Patents

Abstract

PURPOSE: An apparatus and a method for outputting audio of a recording medium are provided to regularly maintain audible sound output through a speaker in playing disks different in audio recording level. CONSTITUTION: A medium discriminating unit(21) discriminates a kind of the corresponding recording medium. A DAC(Digital to Analog Converter)(11) converts audio digital signals read from the recording medium into analog signals. An amplifier(12) amplifies the converted analog signals. A buffer(13) buffers the amplified audio signals to be output to an audio external connecting unit(14). A gain variable unit(23) receives the amplified audio signals and changes amplification gains of the input audio signals according to the kind of the recording medium. Another amplifier(25) amplifies the input audio signals with the variably set gain. A speaker amplifier(15) amplifies the amplified audio signals into audible sounds to be output to the outside through a speaker(16).

Description

Apparatus and Method for outputting audio of recording media}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio output apparatus and method of a recording medium, and more particularly, in a DVD player as a recording medium reproducing apparatus capable of reproducing two or more kinds of recording media such as a CD or a DVD. An audio output apparatus and method for a recording medium for making the audio volume constant regardless of the type of the recording medium.

In general, DVDs and CDs as optical recording media are recorded at different audio levels, so even if the volume of audio outputted when the user attempts to watch a DVD or CD through a DVD player is adjusted to a certain volume by the user, It depends on the type of disc. Therefore, even if the volume is adjusted on the basis of any one recording medium, there is a hassle of having to readjust the volume in order to enjoy different types of recording media.

FIG. 1 is a block diagram illustrating an audio output circuit of a conventional DVD player. As shown in FIG. 1, a digital / analog converter (DAC) 11 and an amplifier that receives an output of the DAC 11 as an input ( 12), a buffer 13 for receiving the output of the amplifier 12 as an input, an audio lineout 14 for receiving the output of the buffer 13 as an input, and an output of the amplifier 12. It is composed of a speaker amplifier 15 that receives the output as an input and a speaker 16 for receiving the output of the speaker amplifier 15 and outputs it to the outside, the operation is briefly described as follows.

The DAC 11 converts the audio digital signal read from the recording medium into an analog signal, and the amplifier 12 amplifies the converted analog audio signal. The amplified audio signal is output to the audio external connection unit 14 through the buffer 13. In addition, the amplified audio signal is provided to an input of the speaker amplifier 15 and amplified, and then externally output as audible audio sound through the speaker 16.

1, it can be seen that a single amplifier 12 for amplifying the analog audio signal is provided. Therefore, if the gain of the single amplifier 12 is set once per circuit configuration, adjustment is not possible afterwards, and only the volume of the audio output through the speaker 16 to the outside is output to the speaker amplifier 15. Adjust the output manually.

However, since audio levels of DVD discs, CD discs, or MP3 discs are recorded (or called) differently from each other, the volume of sound output to the outside through the speaker is different depending on the type of disc. Even if the user has completed the desired volume control when listening to a specific recording medium, there is a hassle of having to redo the volume control when viewing another recording medium. That is, conventionally, the speaker output volume is different depending on the type of disk, which has to be manually adjusted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to record a volume of audio that is uniformly output through a speaker regardless of the type of the recording medium in a recording medium having different audio recording levels. It is an object of the present invention to provide an audio output device and a method of a medium.

1 is a block diagram illustrating an audio output circuit of a conventional DVD player,

2 is a block diagram of an audio output apparatus of a recording medium according to an embodiment of the present invention;

FIG. 3 is a detailed circuit diagram of the gain variable unit 23 and the amplifier 25 of FIG. 2.

4 is a flowchart illustrating an audio output method of a recording medium according to an embodiment of the present invention.

※ Explanation of code for main part of drawing

11: digital-to-analog converter 12,25: amplifier

13: buffer 15: speaker amplifier

16 speaker 21 medium determination unit

23: gain variable part

In order to achieve the above object, an audio output apparatus of a recording medium according to the present invention includes an audio output apparatus provided in the recording medium reproducing apparatus, comprising: discriminating means for discriminating a type of the recording medium as a reproduction target; And gain variable amplifying means for varying and amplifying the gain of the audio signal read out from the recording medium and converted into an analog signal according to the determination result.

The gain variable amplifying means comprises: a plurality of resistance elements each branched in parallel to the output path of the audio signal into a plurality of paths and connected on the plurality of branched paths; An interrupting unit for interrupting an output path through each of the resistance elements according to the determination result; And an amplifying unit for amplifying the output of the intermittent unit and providing the amplified unit to an input of a speaker amplifier for outputting an audible audio sound through a speaker, wherein the plurality of resistor elements have different resistance values, The difference is set in response to the relative difference in the audio recording level between the recording media.

In order to achieve the above object, an audio output method of a recording medium according to the present invention is a method of reproducing various recording media through a single playback device, comprising: a first step of determining the type of the recording medium as a reproduction target; ; A second step of varying and amplifying a gain of an audio signal read out from the recording medium and converted into an analog signal according to the determination result; And a third step of converting the amplified audio signal into an audible audio signal and outputting the external audio signal.

The apparatus and method of the present invention configured as described above, in reading out an audio signal from a recording medium and outputting it externally as an audible sound, amplifies the gain of the audio signal according to the type of the recording medium (i.e. According to the present invention, it is possible to make the audio sound level through the speaker constant regardless of the type of the recording medium in the recording medium having different audio recording levels.

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

2 is a block diagram of an audio output apparatus of a recording medium according to an embodiment of the present invention, as shown in the figure, a medium discriminating unit 21 for discriminating a type of a corresponding recording medium as a reproduction target; A digital-to-analog converter (DAC) 11 for converting an audio digital signal read from a recording medium into an analog signal; An amplifier (12) for amplifying the analog audio signal converted through the DAC (11); A buffer 13 for buffering the audio signal amplified by the amplifier 12 and outputting the audio signal to the audio external connection unit 14; A gain variable section (23) for inputting the amplified audio signal through the amplifier (12), and for varying the amplification gain of the input audio signal according to the type of medium determined by the medium discriminating section (21); An amplifier 25 for amplifying the input audio signal with a gain variably set by the gain variable section 21; The speaker 25 is configured to amplify the audio signal amplified by the amplifier 25 to an audible sound and to output the speaker 16 to the outside.

3 is a detailed circuit diagram of the gain variable unit 23 and the amplifier 25 of FIG. 2, and as shown in the figure, the gain variable unit 23 is amplified by the amplifier 12. The output path of the audio signal is branched in parallel into a plurality of paths, and the plurality of resistance elements Ra, Rb, and Rc are connected to the plurality of branched paths, respectively, and through the respective resistance elements Ra, Rb, and Rc. The output path is constituted by an interruption section 23a for interrupting the output path in accordance with the gain control signal based on the result of the determination by the medium discrimination section 21. In addition, the amplifier 25 is connected to the input terminal of the speaker amplifier 15, the intermittent portion 23a inputs the output to the inverting stage, the non-inverting stage is grounded.

The plurality of resistors Ra, Rb, and Rc of the gain variable section 23a are configured to have different resistance values, but the relative difference in the resistance values is inversely corresponding to the relative difference in audio recording levels between recording media. Do it.

For example, in the present invention, when the recording medium as a playable object is a DVD, CD, and MP3 disc, the corresponding resistance for adjusting the audio output gain of the DVD is Ra, and the corresponding resistance for adjusting the audio output gain of the CD is Rb. The corresponding resistance for adjusting the audio output gain of the MP3 disc is set to Rc, but the difference in the resistance values between Ra, Rb and Rc corresponds to the difference in the audio recording level between the DVD, CD and MP3 discs, respectively. That is, assuming that the magnitude of the audio recording level between the media is in the order of DVD, CD, and MP3, the resistance values are in the order of Rc, Rb, and Ra, and the difference between the resistance values is based on the absolute value of the difference between the audio recording levels. Make sure that they correspond.

Discrimination of the recording medium in the medium determination unit 21 can be implemented by a general known technique for distinguishing a DVD from a CD, so a detailed description thereof will be omitted.

4 is a flowchart illustrating an audio output method of a recording medium according to an embodiment of the present invention, which is applied to the apparatus of the present invention of FIGS. 2 and 3 to be described in parallel with its operation.

First, when a recording medium is mounted on a deck and / or a pickup unit of a reproduction apparatus (not shown) to which the present invention is adopted, the medium discriminating unit 21 determines the type of the mounted recording medium (S401). By generating a gain control signal according to the discrimination result and controlling the intermittent operation of the intermittent unit 23a, the audio amplification gain according to the type of the mounted recording medium, that is, the amplification degree of the amplifier 25 is variably set ( S402).

For example, when it is determined in step S401 that the mounted recording medium is a DVD, an audio signal path is made via the resistor Ra, and in the case of a CD, an audio signal path is made via the resistor Rb. In the step S402, if the medium discrimination unit 21 generates a corresponding gain control signal and provides the gain control signal to the interrupter 23a so that an audio signal path via the resistor Rc is formed, the interrupter 23a is performed. An intermittent operation is performed such that a corresponding path is formed based on the provided gain control signal. Therefore, the amplifier 25 amplifies an audio signal through a path having a different resistance value (that is, a resistance value corresponding to the reverse difference in the relative difference in audio recording levels between recording media) according to the type of recording medium as an optional input. After the output, the amplification gain is variable.

That is, the amplification gain of the amplifier 25 is changed to increase the amplification gain if the audio recording level between recording media is relatively high through the processes of steps S401 and S402, and the amplification gain of the amplifier 25 is increased if the audio recording level is relatively low. Therefore, the output level of the audio signal output from the amplifier 25 is always constant regardless of the type of recording medium currently being reproduced.

Finally, after amplifying the output of the amplifier 25 to the audible audio signal through the speaker amplifier 15 (which is usually amplified by the user's manual adjustment, the volume is adjusted), the speaker 16 External output through an audible sound through (S403).

As described in detail above, according to the audio output apparatus of the recording medium according to the present invention, it becomes possible to keep the sound of the audible sound output through the speaker at the time of playing a disc having a different audio recording level, such as a portable DVD player or the like. Applied to a disc player, the effect of producing a constant speaker output regardless of the type of disc is created.

Claims (5)

An audio output apparatus provided in a recording medium reproducing apparatus, Discriminating means for discriminating the type of the recording medium as a reproduction object; And And gain varying amplifying means for varying and amplifying the gain of the audio signal read out from the recording medium and converted into an analog signal according to the determination result. The method of claim 1, The gain variable amplifying means, A plurality of resistance elements each branched in parallel to the output path of the audio signal into a plurality of paths and connected on the plurality of branched paths; An interrupting unit for interrupting an output path through each of the resistance elements according to the determination result; And And an amplifying section configured to amplify the output of the intermittent section and provide the amplifying section to an input of a speaker amplifier for outputting audible audio sound through a speaker. The method of claim 2, Wherein the plurality of resistance elements have different resistance values, the resistance values being set based on a relative difference of audio recording levels between recording media. In a method for reproducing various recording media through a single reproducing apparatus, A first step of determining the type of the recording medium as a reproduction object; A second step of varying and amplifying a gain of an audio signal read out from the recording medium and converted into an analog signal according to the determination result; And And a third step of converting the amplified audio signal into an audible audio signal and outputting the external audio signal. The method of claim 4, wherein And said variable degree is set based on a relative difference in audio recording levels between recording media.