KR100551378B1 - Digital receiver for a head-phone output of the optical disk player - Google Patents

Abstract

The present invention relates to a digital receiver of an optical disc reproducing apparatus for headphone output, and more particularly, to a channel decoding for decoding an audio signal transmitted from the optical disc reproducing apparatus into a plurality of multi-channels and generating a mixed signal summed up of the decoded multi-channels. And a PWM converter for converting multi-channel signals and mix signals into PWM signals, a first filter for converting the PWM signals of each channel into an arbitrary frequency band and converting them into analog signals, and a first filter. First amplification unit for amplifying the analog signal of each channel to pass to a plurality of speakers for multi-channel, a second filter for converting the mixed PWM signal to an arbitrary frequency band and converted into an analog signal, and the second filter And a second amplifier for amplifying a mix analog signal and delivering it to the headphones. Therefore, according to the present invention, according to the connection between the digital receiver and the headphone, the multi-channel PWM signal is converted into an analog signal through a filter and then transmitted to the speaker, or the mixed PWM signal in which the multi-channels are added together is converted through another filter. By converting the signal into a headphone, the multichannel analog signal can be provided to the speaker or headphone without the use of a DAC.

Digital Receiver, PWM, Speaker, Multi Channel, Headphone

Description

DIGITAL RECEIVER FOR A HEAD-PHONE OUTPUT OF THE OPTICAL DISK PLAYER}

1 is a block diagram showing a digital receiver of a conventional optical disc player;

2 is a view showing the internal structure of a conventional optical disc player and a digital receiver;

3 is a block diagram showing a digital receiver of the optical disk player for headphone output according to the present invention;

4 is a diagram illustrating an internal configuration of an optical disc reproducing apparatus and a digital receiver for headphone output according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: optical disk player such as DVD player

110: digital receiver 111: channel decoding unit

112: PWM converter 113: first filter

114: first amplifier 115: second filter

116: second amplifier 117: control unit

120: speaker 130, 140: connection line

150: headphones

The present invention relates to a digital receiver of an optical disc player, and more particularly, to convert an audio signal output from the optical disc player into a pulse width modulation (PWM) signal and output the converted multi-channel PWM signal to a speaker while outputting the same to a headphone. And a digital receiver of an optical disc reproducing apparatus for headphone output.

As a device for reproducing an optical disc, a DVD (Digital Video Disk) reproducing apparatus is widely used. In such an optical disc reproducing apparatus, a digital receiver is used in connection with a digital receiver to listen to a reproduced digital audio signal in a multi-channel, for example, 5.1-channel. The digital receiver decodes the digital audio signal (e.g. PCM signal) transmitted from the optical disk player to multi-channel (e.g. 5.1 channel) and converts the decoded signal into analog signal through DAC (Digital to Analog Converter), The signal is transmitted to a plurality of speakers and output.

1 is a block diagram showing a digital receiver of an optical disc reproducing apparatus according to the prior art. Referring to FIG. 1, one of the connection lines 30 is inserted into an audio output terminal of a DVD player 10, which is a conventional optical disc player, and the other end of the connection line 30 is connected to an audio input terminal of the digital receiver 20 ( Plug in) (not shown). Unexplained reference numeral 24 denotes a plurality of speakers of a multi channel (for example, 5.1 channel) connected to the digital receiver 20.

2 is a diagram showing the internal structure of a conventional optical disc reproducing apparatus and a digital receiver. Referring to FIG. 2, the DVD player 10, which is a conventional optical disc player, includes an optical disc 11, an optical pickup unit 12, a digital signal processor (DSP) 13, a decoder 14, a microcomputer 16, Key input section 17, display 18, audio signal processing section 15, and the like. Here, the video signal processor is omitted. The digital receiver 20 connected to the DVD player 10 is composed of a channel decoder 220, a DAC 222, an amplifier 224, and the like.

The conventional digital receiver configured as described above operates as follows.

The optical pickup unit 12 of the DVD player 10 optically picks up a signal recorded on an optical disc 11 such as a DVD and converts the signal into an electrical signal. The DSP 13 digitally processes the signal of the optical pickup unit 12 and reproduces the original signal. The decoder 14 decompresses the signal reproduced in the DSP 13 and decodes the video signal and the audio signal from the decompressed signal, respectively. The audio signal processor 15 processes the audio signal of the decoder 14 and transmits the audio signal to the digital receiver 20.

The digital receiver 20 decodes the digital audio signal (for example, PCM signal) transmitted from the DVD player 10 through the channel decoding unit 220 into each channel signal of multi-channel (for example, 5.1 channel). The DAC 222 converts a multi-channel signal decoded by the channel decoder 220 into an analog signal. The amplifier 224 power amplifies a signal of each channel of the multi-channel to a predetermined level and delivers the same to each of the plurality of speakers 24 for the multi-channel. Therefore, the audio signal of the optical disc 11 reproduced by the DVD player 10 via the digital receiver 20 is converted into a multi-channel audio signal and output to the plurality of speakers 24.

However, since the conventional digital receiver 20 includes a DAC 222 for converting a digital signal into an analog signal, there is a problem in that product cost is high.

An object of the present invention is to solve the problems of the prior art as described above by converting the audio signal output from the optical disk playback device to a PWM signal and passing the converted multi-channel PWM signal through the filter to the speaker all the multi-channel The integrated mix PWM signal is passed through another filter to the headphones to provide a digital receiver of an optical disc player that can convert a digital audio signal into an analog signal without using a DAC in the digital receiver.

In order to achieve the above object, the present invention provides a digital receiver connected to an optical disc reproducing apparatus for reproducing a signal of an optical disc, wherein the audio signal transmitted from the optical disc reproducing apparatus is decoded into a plurality of multi-channels, and the decoded multi-channels are summed together. A channel decoding unit for generating a signal, a PWM converting unit for converting a multi-channel signal and a mixed signal decoded by the channel decoding unit into a PWM signal, and a PWM signal of each channel of the PWM converting unit passing through an arbitrary frequency band A first PWM for converting an analog signal, a first amplifier for amplifying the analog signal of each channel passing through the first filter and transmitting the amplified analog signal to a plurality of speakers for multi-channels, and a PWM signal mixed PWM signal of an arbitrary frequency band A second filter converts the analog signal into a reverse signal and a mix analog signal passed through the second filter is amplified. It includes a second amplifying section for transmission to the headphones.

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

3 is a block diagram showing a digital receiver of the optical disc reproducing apparatus for headphone output according to the present invention. Referring to FIG. 3, the digital receiver 110 according to the present invention is connected to an audio input terminal (not shown) of an audio output terminal of the DVD player 100, which is an optical disk player, through a connection line 130. The digital receiver 110 is connected to the headphone 150 through another connection line 140 to an audio output terminal (not shown). Unexplained reference numeral 120 denotes a plurality of speakers of a multi-channel (eg, 5.1-channel) connected to the digital receiver 110.

4 is a diagram illustrating an internal configuration of an optical disc reproducing apparatus and a digital receiver for headphone output according to the present invention. Referring to FIG. 4, the DVD player 100, which is an optical disk player, includes an optical disk 101, an optical pickup unit 102, a DSP 103, a decoder 104, a microcomputer 106, a key input unit 107, And a display 108, an audio signal processor 105, and the like.

The digital receiver 110 of the present invention connected to the DVD player 100 includes a channel decoder 111, a PWM converter 112, a first filter 113, a first amplifier 114, and a second filter. 115, the second amplifier 116, the control unit 117 and the like. Here, the first and second filters 113 and 115 use a low pass filter. The first amplifier 114 uses a power amplifier and the second amplifier 116 uses an OP amplifier.

The control unit 117 of the digital receiver 110 controls the operation of the channel decoding unit 111 according to the presence or absence of a connection line 140 connecting the headphones 150 and the digital receiver 110 to each other. In other words, when the connection line 140 of the headphone 150 is connected to the digital receiver 110, the controller 117 converts the audio signal of the DVD player 100 into a multi-channel signal through the channel decoder 111. Decode and generate a mixed signal by adding up the decoded multi-channel signals. On the other hand, when the connection line 140 of the headphone 150 is not connected to the digital receiver 110, the controller 117 transmits the audio signal of the DVD player 100 through the channel decoder 111 to the multi-channel signal. Only decode it.

The digital receiver according to the present invention configured as described above operates as follows.

The optical pickup unit 102 of the DVD player 100 optically picks up a signal recorded on an optical disc 101 such as a DVD and converts the signal into an electrical signal. The DSP 103 digitally processes the signal of the optical pickup unit 102 and reproduces the original signal. The decoder 104 decompresses the signal reproduced in the DSP 103 and decodes the video signal and the audio signal from the decompressed signal, respectively. The audio signal processor 105 processes the audio signal of the decoder 104 and transmits it to the digital receiver 110.

The control unit 117 of the digital receiver 110 controls the operation of the channel decoding unit 111 according to the presence or absence of a connection line 140 connecting the headphones 150 and the digital receiver 110 to each other. When the connection line 140 of the headphone 150 is not connected to the digital receiver 110, the controller 117 controls the channel decoder 111 to control the channel decoder 111 of the DVD player 100 through the channel decoder 111. Decode the digital audio signal (e.g. PCM signal) into each channel signal of multi-channel (e.g. 5.1 channel). The PWM converter 112 converts each channel signal of the multi-channel decoded by the channel decoder 111 into a PWM signal and then transfers it to the first filter 113. The first filter 113 receives the PWM signal of each channel of the PWM converter 112 and passes it through an arbitrary frequency band (ie, a low frequency band) to output an analog signal of each channel. In addition, the first amplifier 114 amplifies the signal of each channel output through the first filter 113 to a predetermined level and transfers the same to each of the plurality of speakers 117 for the multi-channel.

If the connection line 140 of the headphone 150 is connected to the digital receiver 110, the control unit 117 controls the channel decoding unit 111 to control the channel decoding unit 111 of the DVD player 100. The digital audio signal (eg, PCM signal) is decoded into a multi-channel (eg, 5.1-channel) signal, and a mixed signal obtained by adding up the decoded multi-channel signals is added. Accordingly, the second filter 115 receives the mixed PWM signal in which all the channels of the PWM converter 112 are added, and passes only a predetermined frequency band (also a low frequency band) and outputs the mixed analog signal. The second amplifier 116 amplifies the mixed analog signal obtained by adding all the channels output through the second filter 115 to the headphone 150.

Therefore, the digital receiver 110 of the optical disc reproducing apparatus converts an audio signal provided from the optical disc reproducing apparatus into a multi-channel PWM signal and converts the converted multi-channel PWM signal into a first filter (ie, a low pass filter). By transmitting to a speaker, multi-channel digital signals can be converted to analog signals without using a DAC.

In addition, the digital receiver 110 of the optical disc reproducing apparatus of the present invention decodes an audio signal provided by the optical disc reproducing apparatus into a multi-channel, converts a mixed signal obtained by adding up the decoded multi-channels into a PWM signal, and converts it into a second filter (that is, The low pass filter allows the headphones to listen to analog multichannel audio through the headphones without the use of a DAC.

As described above, the present invention converts the multi-channel PWM signal through the filter into an analog signal according to whether the digital receiver and the headphone are connected or not, and then delivers the mixed PWM signal in which the multi-channels are added together. By converting it into an analog signal through a filter and forwarding it to the headphones, multichannel analog signals can be provided to speakers or headphones without using a DAC.

On the other hand, the present invention is not limited to the above-described embodiment, various modifications are possible by those skilled in the art within the spirit and scope of the present invention described in the claims to be described later.

Claims (3)

A digital receiver connected to an optical disc player for reproducing a signal of an optical disc, A channel decoding unit for decoding the audio signal transmitted from the optical disc reproducing apparatus into a plurality of multi-channels, and generating a mixed signal by adding up the decoded multi-channels; A PWM converter for converting the multi-channel signal and the mixed signal decoded by the channel decoder into PWM signals, respectively; A first filter for converting the PWM signal of each channel of the PWM converter into an analog signal by passing the signal in an arbitrary frequency band; A first amplifier for amplifying an analog signal of each channel passing through the first filter and transmitting the amplified analog signal to a plurality of speakers for the multi-channel; A second filter for converting the mixed PWM signal of the PWM converter into an analog signal by passing the signal in an arbitrary frequency band;  A second amplifier for amplifying and passing the mixed analog signal passing through the second filter to the headphones; Digital receiver of the optical disc playback device comprising a. The method of claim 1, And the first and second filters are low pass filters. The method of claim 1, And a controller configured to control the channel decoder to output the multi-channel decoded signal or the mixed signal according to whether the digital receiver is connected to the headphones.

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