KR100551381B1 - Wireless digital receiver for the head-phone output of the optical disk player - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless digital receiver of an optical disc reproducing apparatus for headphone output. In particular, the present invention relates to a channel decoding unit for decoding an audio signal transmitted from the optical disc reproducing apparatus into a plurality of multi-channels, and a plurality of multi-channels decoded by the channel decoding unit. The PWM converter converts the mixed signal, which is the sum of all the signals and multi-channels, into a PWM signal, and converts the channel signal of the wired speaker through an arbitrary frequency band among the multi-channel PWM signals of the PWM converter into an analog signal. An amplifier for amplifying the analog signal of each channel passing through the filter and passing it to the wired speaker, a sampling converter for converting the mixed PWM signal of the PWM converter into a set frequency signal, and the frequency signal of the sampling converter as an RF signal It includes an RF transmitter for converting and transmitting to the wireless speaker. Therefore, the present invention can output a digital audio signal as an analog signal without using a DAC and ADC in a wireless digital receiver, and can wirelessly transmit a digitized audio signal by PWM, and also provide a multi-channel headphone signal to a wireless speaker. You can print

Wireless digital receiver, PWM converter, RF, speaker, headphone

Description

Wireless digital receiver for optical disc player for headphone output {WIRELESS DIGITAL RECEIVER FOR THE HEAD-PHONE OUTPUT OF THE OPTICAL DISK PLAYER}

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

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

3 is a block diagram showing a reception circuit of a wireless digital receiver according to the prior art;

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

5 is a view showing the internal configuration of an optical disk player and a wireless digital receiver according to the present invention;

6 is a block diagram showing a receiving circuit of a wireless digital receiver to which the present invention is applied.

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

100: optical disk player such as DVD player

120: wireless digital receiver 121: channel decoding unit

122: PWM converter 123: filter

124: amplifier 125: sampling converter

126: RF transmitter 132: front speaker

134: rear speaker 136: center speaker

140: Headphone 150: Receive circuit of wireless digital receiver

151: RF receiver 153: Channel decoding unit

155: DSP 157: filter

158: amplifier 159: headphone output unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital receiver of an optical disc reproducing apparatus, and more particularly, to a wireless receiver of an optical disc reproducing apparatus for transmitting an audio signal output from an optical disc reproducing apparatus to a remote wireless speaker and transmitting a headphone output to a wireless speaker. It is about the receiver.

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.

In general, stereo is a sound format in which an audio signal is separated into left and right, and audio recorded in stereo is divided into audio signals according to the recorded direction during playback to provide a more lively audio sound to the user. For example, a multichannel 5.1-channel digital receiver delivers audio signals to one woofer that reinforces bass along with five front, left, center and rear speakers.

In the case of such a 5.1-channel digital receiver, a center or rear speaker is connected by wire. However, due to limitations in place and installation, a technology for wirelessly connecting the digital receiver and the speakers has emerged.

1 is a block diagram showing a wireless digital receiver of a general optical disc player. Referring to FIG. 1, a connection line 30 is connected between an audio output terminal of a DVD player 10, which is an optical disk player, and an audio input terminal (not shown) of the wireless digital receiver 30. In addition, a front speaker 42 or a woofer speaker (not shown) of a multi-channel (for example, 5.1 channel) is connected to an audio output terminal (not shown) of the wireless digital receiver 30. The multi-channel center speaker 44 and the rear speaker 46 receive signals wirelessly with the wireless digital receiver 30.

2 is a diagram showing the internal structure of a conventional optical disc player and a wireless 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 wireless digital receiver 30 connected to the DVD player 10 includes a channel decoding unit 31, a DAC 33, an amplifier 35, an analog to digital converter (ADC), an RF transmitter 39, and the like. do.

3 is a block diagram showing a reception circuit of a wireless digital receiver according to the prior art. Referring to FIG. 3, the receiver circuit 50 of the conventional wireless digital receiver includes an RF receiver 51, a decoder 53, a DSP 55, a DAC 57, and an amplifier 59. The receiving circuit 50 receives the RF signal from the wireless digital receiver through the RF receiving unit 51, and transmits the RF signal to the center speaker 44 and the rear speaker 46 of the multi-channels from the RF signal received through the decoding unit 53. The signal is converted into a signal of a corresponding channel and digitally processed through the DSP 55 and the DAC 57, and then converted into an analog signal. The amplifier 59 transmits the signal amplified to an arbitrary power level to the center speaker 44 and the rear speaker 46.

The wireless digital receiver and the multi-channel speaker of the conventional DVD playback apparatus configured as described above operate 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 wireless digital receiver 30.

The wireless digital receiver 30 decodes the digital audio signal (for example, PCM signal) transmitted from the DVD player 10 through the channel decoding unit 31 into a channel signal of each speaker of a multi channel (for example, 5.1 channel). The DAC 33 converts the multi-channel audio signal decoded by the channel decoding unit 31 into an analog signal. The amplifier 35 amplifies only the front speaker and the woofer audio signal to a predetermined level among the multi-channel analog audio signals converted by the DAC 33 and then wires the front speaker 42 and the woofer (not shown). To pass on. At the same time, the ADC 37 converts only the rear speaker and center speaker signals into digital signals among the multi-channel analog audio signals converted by the DAC 33. The RF transmitter 39 converts the digital signals of the rear and center speakers converted by the ADC 37 into RF signals and then transmits them.

Then, the receiving circuit 50 of FIG. 3 receives the RF signal of the wireless digital receiver 30 through the RF receiver 51 and decodes it into the corresponding channel signal through the decoder 53. After the digital signal processing through the DSP 55 and the analog signal through the DAC 57, the amplification unit 59 amplifies it to an arbitrary voltage level and then the center speaker 44 (or the rear speaker). To pass on.

Accordingly, among the 5.1-channel speakers, the front speaker 42 and the woofer (not shown) output the front left and right audio signals transmitted from the wireless digital receiver 30 via wires, and output the bass audio signal. The center speaker 44 outputs the center audio signal transmitted from the wireless digital receiver 30 in a wireless RF manner, and the rear speaker 46 also transmits the rear audio signal transmitted from the wireless digital receiver 30 in a wireless RF manner. Outputs

However, such a conventional wireless digital receiver 30 has to convert the center and rear signals from the audio signals converted into analog through the DAC 33 into digital signals through the ADC 37. Therefore, the conventional wireless digital receiver must use the DAC and ADC, so there is a problem that the product cost is expensive. In addition, even in the center speaker or the rear speaker of the conventional wireless digital receiver 30, only the audio signal of the corresponding speaker could be heard through the headphone even if there is a headphone connection terminal.

An object of the present invention is to convert the audio signal output from the optical disk reproducing apparatus to a PWM signal in order to solve the problems of the prior art as described above, and outputs a speaker signal connected by wire among the converted multi-channel PWM signal through a filter and wireless By converting the speaker's PWM signal and the multi-channel mixed signal into a specific frequency signal through a sampling converter, and then transmitting it to the RF transmitter, the wireless digital receiver can output digital audio signals as analog signals without using DACs and ADCs. The present invention provides a wireless digital receiver of an optical disk player capable of wirelessly transmitting digitized audio signals through PWM and outputting multi-channel headphone signals to wireless speakers.

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, comprising: a channel decoding unit for decoding an audio signal transmitted from the optical disc reproducing apparatus into a plurality of multi-channels, and a decoding in the channel decoding unit. A PWM converter converts a plurality of multi-channel signals and a multi-channel mixed signal into PWM signals respectively, and a channel signal of a wired speaker is passed through an arbitrary frequency band among the multi-channel PWM signals of the PWM converter. A filter for converting an analog signal, an amplifier for amplifying the analog signal of each channel passing through the filter and delivering it to the wired speaker, a sampling converter for converting the mixed PWM signal of the PWM converter into a set frequency signal, and the frequency of the sampling converter RF transmitter that converts a signal into an RF signal and transmits the signal to a wireless speaker It should.

In order to achieve the above object, another apparatus of the present invention is a receiving circuit of a wireless digital receiver, which receives a signal of a wireless digital receiver, converts a signal of the receiving unit into a multi-channel mixed signal, and converts the mixed signal from the center speaker and the rear. A channel decoding unit for decoding a channel signal of a speaker, a filter for converting a signal of the channel decoding unit into an analog signal, amplifying the signal of the filter and transmitting channel signals of a center speaker and a rear speaker among the amplified signals to the corresponding speaker An amplifier unit and a headphone output unit for transmitting a multi-channel mixed signal of the signal amplified by the amplifier to the headphone.

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

4 is a block diagram illustrating a wireless digital receiver of an optical disc reproducing apparatus for headphone output according to the present invention. Referring to FIG. 4, a connection line 110 is connected between an audio output terminal of the DVD player 100, which is an optical disk player, and an audio input terminal (not shown) of the wireless digital receiver 120. In addition, a front speaker 132 or a woofer speaker (not shown) of a multi-channel (for example, 5.1 channel) is connected to an audio output terminal (not shown) of the wireless digital receiver 120. In addition, the multi-channel center speaker 134 and the rear speaker 136 receive a signal wirelessly with the wireless digital receiver 120. In addition, the multi-channel center speaker 134 and the rear speaker 136 of the present invention are connected to the headphone 140 for listening to the multi-channel audio signal transmitted from the wireless digital receiver 120. In this case, the headphones 140 may be replaced by an earphone.

5 is a diagram showing the internal configuration of an optical disc reproducing apparatus and a wireless digital receiver according to the present invention. Referring to FIG. 5, the DVD player 100, which is an optical disk player according to the present invention, includes an optical disk 101, an optical pickup unit 102, a DSP 103, a decoder 104, a microcomputer 106, and a key input unit. 107, display 108, audio signal processing section 105, and the like. Here, the video signal processor is omitted. The wireless digital receiver 120 connected to the DVD player 100 includes a channel decoder 121, a PWM converter 122, a filter 123, an amplifier 124, a sampling converter 125, and an RF transmitter ( 126). Here, the filter 123 uses a low pass filter that passes the low frequency. The amplifier 124 uses a power amplifier.

The channel decoding unit 121 of the wireless digital receiver 120 according to the present invention converts the digital audio signal (for example, PCM signal) transmitted from the DVD player 100 into a channel signal of each speaker of a multi channel (for example, 5.1 channel). Decode

The PWM converter 122 converts a signal of a speaker channel (for example, a front speaker and a woofer) connected by wire among the multi channels decoded by the channel decoder 121 into a PWM signal, and adds all the PWM signals of the multi channel. Generate a mix PWM signal.

The filter 123 passes a PWM signal of a speaker channel (for example, a front speaker and a woofer) connected by wire among the multi-channels of the PWM converter 122 to a low frequency band and converts it into an analog signal.

The amplifier 124 power amplifies the signals for the front speaker and the woofer output through the filter 123 to a predetermined level and transfers them to the front speaker 132 and the woofer (not shown), respectively.

The sampling converter 125 samples the mixed PWM signal obtained by adding up the PWM signals of the multi-channels of the PWM converter 122 to a set frequency (for example, 48 kHz) signal.

The RF transmitter 126 converts the frequency signal of the sampling converter 125 into an RF signal and transmits the same to the receiving circuits for the center speaker and the rear speaker at a distance.

6 is a block diagram illustrating a receiving circuit of a wireless digital receiver to which the present invention is applied. Referring to FIG. 6, the reception circuit 150 of the wireless digital receiver includes an RF receiver 151, a channel decoder 153, a DSP 155, a filter 157, an amplifier 158, and a headphone output unit 159. It is composed of Here, the receiving circuit 150 receives the RF signal from the wireless digital receiver through the RF receiving unit 151, converts the RF signal received through the channel decoding unit 153 into a mixed PWM signal which is a sum signal of a multi-channel, and mixes the mixed signal. Decodes the channel and rear speaker channel signals from the PWM signal. The receiving circuit 150 digitally processes the mixed PWM signal and the channel PWM signals of the center speaker and the rear speaker through the DSP 155 and then converts these signals into analog signals through the filter 157. In addition, the amplifier 158 transfers the signal amplified to an arbitrary power level to the center speaker 134 and the rear speaker 136. In addition, the multi-channel mixed signal amplified by the amplifier 158 is transferred to the headphone output unit 159.

The wireless digital receiver and the multi-channel speaker of the DVD playback apparatus for headphone output according to the present invention configured as described above operate 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 the audio signal to the wireless digital receiver 120.

The wireless digital receiver 120 decodes the digital audio signal (for example, PCM signal) transmitted from the DVD player 100 through the channel decoding unit 121 into a channel signal of each speaker of a multi-channel (for example, 5.1 channel). The PWM converter 122 transmits the result. The PWM converter 122 converts a signal of a speaker channel (for example, a front speaker and a woofer) connected by wire among the multi channels decoded by the channel decoder 121 into a PWM signal, and adds all the PWM signals of the multi channel. Generate a mix PWM signal. The filter 123 passes the PWM signal of the speaker channel (for example, the front speaker and the woofer) of the PWM converter 122 into a low frequency band, converts the analog signal into an analog signal, and then transfers the PWM signal to the amplifier 124. The amplifier 124 power amplifies the signals for the front speaker and the woofer output through the filter 123 to a predetermined level, and transmits them to the front speaker 132 and the woofer (not shown), respectively.

In addition, the sampling converter 125 in the wireless digital receiver 120 samples the mixed PWM signal of the multi-channel of the PWM converter 122 to a set frequency (for example, 48 kHz) signal and transfers the same to the RF transmitter 126. The RF transmitter 126 converts the frequency signal of the sampling converter 125 into an RF signal and transmits it to the receiving circuits for the remote center speaker and the rear speaker.

Then, the receiving circuit 150 installed in the center speaker and the rear speaker of the wireless digital receiver of FIG. 6 receives the RF signal of the wireless digital receiver 120 through the RF receiver 151. The RF signal received through the channel decoder 153 is converted into a mixed PWM signal that is a sum signal of the multi-channels, and the channel signals of the center speaker and the rear speaker are decoded from the mixed PWM signal.

The receiving circuit 150 digitally processes the mixed PWM signal and the channel PWM signals of the center speaker and the rear speaker through the DSP 155.

The receiving circuit 150 converts the mixed PWM signal and the channel PWM signals of the center speaker and the rear speaker through an arbitrary low-frequency band through the filter 157 and converts them into analog signals.

In addition, the receiving circuit 150 transmits a signal amplified to an arbitrary power level through the amplifier 158 to the center speaker 134 or the rear speaker 136. Then, the multi-channel mixed signal amplified by the amplifier 158 is transferred to the headphone output unit 159.

Accordingly, among the 5.1-channel speakers, the front speaker 132 and the woofer (not shown) output the front left and right audio signals transmitted from the wireless digital receiver 120 through the wire and output the bass audio signal. In this case, the wireless digital receiver 120 of the present invention converts the front speaker and the woofer channel signals into the PWM signals among the audio signals of the DVD player by using the PWM converter 122 and the filter 123 without using a DAC. After that, it is converted into an analog signal and output.

In addition, the wireless digital receiver 120 transmits a multi-channel mixed signal to the receiving circuit 150 of the center speaker 134 or the rear speaker 136 through the RF transmitter 126 to transmit the channel decoding unit to the receiving circuit 150. After decoding the multi-channel mixed signal and the channel signals of the center speaker 134 and the rear speaker 136 through 153, the headphone output unit delivers the signal of the corresponding speaker channel to each speaker 134, 136. The multi-channel mix signal is output to 159. Therefore, the user can listen to the audio signal of the multi-channel (for example, 5.1-channel) reproduced by the optical disc player through the headphone 140 connected to the center speaker 134 and the rear speaker 136.

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.

As described above, the present invention converts an audio signal output from a DVD player into a PWM signal and outputs a speaker signal connected by wire among the converted multi-channel PWM signals through a filter without using a DAC in a wireless digital receiver. A digital audio signal can also be output as an analog signal.

In addition, the present invention converts the mixed PWM signal, which is the sum of the PWM signal of the wireless speaker and the multi channel, to a specific sampling frequency through a sampling converter, and then transfers the mixed PWM signal to the RF transmitter to digitize the PWM without using an ADC in the wireless digital receiver. The audio signal can be transmitted to the wireless speaker.

In addition, the present invention decodes the mixed signal of the multi-channel from the signal received by the receiving circuit of the wireless speaker and delivers it to the headphone output to listen to the audio signal of the multi-channel (for example 5.1 channel) reproduced in the optical disc playback device through the headphones can do.

Claims (4)

A digital receiver connected to an optical disc player for reproducing a signal of an optical disc, A channel decoding unit decoding the audio signal transmitted from the optical disc reproducing apparatus into a plurality of multi-channels; A PWM converting unit for converting a plurality of multi-channel signals decoded by the channel decoding unit and a mixed signal obtained by adding up the multi-channels, respectively, into PWM signals; A filter for converting a channel signal of a wired speaker from a multi-channel PWM signal of the PWM converter by an arbitrary frequency band and converting the signal into an analog signal; An amplifier for amplifying an analog signal of each channel passing through the filter and transmitting the amplified analog signal to the wired speaker; A sampling converter for converting the mixed PWM signal of the PWM converter into a set frequency signal; An RF transmitter converting the frequency signal of the sampling converter into an RF signal and transmitting the RF signal to the wireless speaker Wireless digital receiver of the optical disk playback device comprising a. The method of claim 1, And said filter is a low pass filter. The method of claim 1, The sampling converter is a wireless digital receiver of an optical disk reproducing apparatus for converting any one of a plurality of frequency signals set. As a reception circuit of a wireless digital receiver, A receiver which receives a signal of the wireless digital receiver; A channel decoder for converting a signal of the receiver into a multi-channel mixed signal and decoding channel signals of a center speaker and a rear speaker from the mixed signal; A filter for converting a signal of the channel decoding unit into an analog signal; An amplifier for amplifying a signal of the filter and transferring channel signals of the center speaker and the rear speaker among the amplified signals to a corresponding speaker; A headphone output unit for transmitting the mixed signal of the multi-channel among the signals amplified by the amplifier to the headphone Wireless digital receiver of the optical disk playback device comprising a.

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