KR20050107928A - Wireless digital receiver 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, and more particularly, to a channel decoding unit for decoding an audio signal transmitted from an optical disc reproducing apparatus into a plurality of multi-channels, and a PWM converter which converts multi-channel signals into PWM signals, respectively. A filter for converting a channel signal of the wired speaker into an arbitrary frequency band among the multi-channel PWM signals and converting the signal into an analog signal, an amplifying unit for amplifying the analog signal of each channel passing through the filter and transmitting the signal to the wired speaker; Among the multi-channel PWM signals of the PWM converter, the sampling converter converts the channel signal of the wireless speaker into a set frequency signal, and the RF transmitter converts the frequency signal of the sampling converter into an RF signal and transmits the RF signal to the wireless speaker. Therefore, the present invention can output a digital audio signal as an analog signal without using a DAC and an ADC in a wireless digital receiver, and can wirelessly transmit the digitized audio signal by PWM.

Description

Wireless digital receiver of optical disc player {WIRELESS DIGITAL RECEIVER OF THE OPTICAL DISK PLAYER}

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 digital receiver of an optical disc reproducing apparatus capable of transmitting an audio signal output from an optical disc reproducing apparatus to a remote wireless speaker.

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. An audio output terminal (not shown) of the wireless digital receiver 30 is connected to a front speaker 42 or a woofer speaker (not shown) of a multi-channel (for example, 5.1 channel). 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 reception 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 RF signal is received from the multi-channel and outputs a signal of a channel corresponding 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.

As a result, 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.

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 a wire through a filter among the converted multi-channel PWM signal and By converting an undetermined PWM signal into a specific frequency signal through a sampling converter and passing it to an RF transmitter, the wireless digital receiver can output a digital audio signal as an analog signal without using a DAC and ADC. The present invention provides a wireless digital receiver of an optical disc reproducing apparatus that can be transmitted wirelessly.

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. PWM conversion unit for converting the multi-channel signal to a PWM signal, a filter for converting the channel signal of the wired speaker to an arbitrary frequency band among the multi-channel PWM signal of the PWM conversion unit into an analog signal, and the filter An amplifier that amplifies the analog signal of each channel and delivers it to the wired speaker, a sampling converter for converting the channel signal of the wireless speaker into a set frequency signal among the multi-channel PWM signals of the PWM converter, and the frequency signal of the sampling converter RF transmitter that converts the signal to a wireless speaker .

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

4 is a diagram showing the internal configuration of an optical disc reproducing apparatus and a wireless digital receiver according to the present invention. 4, 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 each channel signal of the multi-channel decoded by the channel decoder 121 into a 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 PWM signal of the channel for wireless speakers (for example, rear speaker and center speaker) among the multi-channels of the PWM converter 122 at 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.

5 is a block diagram illustrating a reception circuit of a wireless digital receiver to which the present invention is applied. Referring to FIG. 5, the reception circuit 140 of the wireless digital receiver includes an RF receiver 141, a decoder 143, a DSP 145, a DAC 147, and an amplifier 149. The RF signal is received and outputs signals of channels corresponding to the center speaker 134 and the rear speaker 136 among the multi-channels.

The wireless digital receiver and the multi-channel speaker of the DVD player 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 the signal recorded on the 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 each channel signal of the multi-channel decoded by the channel decoder 121 into a 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, converts the signal into an analog signal, and then passes the signal to the amplifier 124. To pass. 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.

In addition, the sampling converter 125 in the wireless digital receiver 120 samples a PWM signal of a wireless speaker channel (for example, a rear speaker and a center speaker) from a multi-channel of the PWM converter 122 at a set frequency (for example, 48 kHz) signal. It is then forwarded to the RF transmitter 126.

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.

Then, the receiving circuit 140 of the wireless digital receiver of FIG. 5 receives the RF signal of the wireless digital receiver 120 through the RF receiving unit 141 and samples the received frequency of the original channel through the decoding unit 143. Decode into a signal. The signal decoded by the DSP 145 is digitally processed, converted into an analog signal by the DAC 147, and then amplified to an arbitrary voltage level by the amplifier 149, and then the center speaker 134 (or rear). Speaker).

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. At this time, the wireless digital receiver 120 of the present invention converts the front speaker and the woofer channel signal into the PWM signal among the audio signals of the DVD player using the PWM converter 122 and the filter 123 without using a DAC. Then convert it to analog.

The center speaker 134 outputs the center audio signal transmitted from the wireless digital receiver 120 in a wireless RF manner, and the rear speaker 136 also transmits the rear audio signal transmitted in a wireless RF manner from the wireless digital receiver 120. Outputs At this time, the wireless digital receiver 120 of the present invention uses the PWM converter 122 and the sampling converter 125 without using an ADC to convert the channel signals of the center and rear speakers among the audio signals of the DVD player as PWM signals. After conversion, it is converted into a specific sampling frequency and then transmitted through the RF transmitter.

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 a PWM signal of a wireless speaker to a specific sampling frequency through a sampling converter and transfers it to an RF transmitter so that the digital signal can be wirelessly transmitted by PWM without using an ADC in the wireless digital receiver.

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

5 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: receiving circuit of the wireless digital receiver

Claims (3)

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 converter for converting the multi-channel signals decoded by the channel decoder into PWM signals, respectively; 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 a channel signal of a wireless speaker into a set frequency signal among the multi-channel PWM signals of the PWM converter; 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.