KR20040060422A - A Multi-channel Wireless Audio Transmission Equipment - Google Patents

Abstract

PURPOSE: An audio multichannel wireless LAN transceiver is provided to transmit multichannel audio signals at 1:n or 1:1 using a wireless LAN and to listen to received audio signals. CONSTITUTION: An audio multichannel wireless LAN transceiver consists of a wireless transmitter(100) and a plurality of wireless receiving terminals. The wireless transmitter(100) is composed of an A/D converter(101) and a wireless transmitting modem(102). The A/D converter(101) converts an analog audio signal, such as a TV or VTR signal, etc., sent from an audio output device(110) into a digital signal. The wireless transmitting modem(102) converts the digital audio signal into a wireless LAN type signal and transmits it to a plurality of wireless receiving terminals, located within an appointed distance, by wireless. The wireless transmitting modem(102) comprises a modulation part(105), an R/F transmitting module(107), and a control part(106). The modulation part(105) modulates and outputs the digital audio signal inputted from the A/D converter(101). The RF transmitting module(107) inserts the modulated audio signal in an RF signal and transmits it by wireless. The control part(106) overall controls the functions of the wireless transmitting modem(102).

Description

Audio multichannel wireless transceiver {A Multi-channel Wireless Audio Transmission Equipment}

The present invention relates to an audio multi-channel wireless transmission / reception apparatus for digitally converting an analog audio signal into a wireless LAN, transmitting 1: 1 or 1: n and receiving a signal as an analog signal. .

In general, the initial telecommunications for transmission and reception are operated in a point-to-point manner, and as the number of users increases and the region expands, a communication network is formed to efficiently deliver communication services from a technical and economic point of view. . Such a communication network has been developed into an analog method, and began to be converted into a digital network after commercializing a pulse code modulation (PCM) method in the 1960s. For example, coding systems have been developed that convert analog signals such as voice into digital signals by digitalizing them from transmission facilities of telephone networks to switching facilities. Such coding schemes include source coding, channel coding, Line coding and the like.

The source encoding is a method of converting information in an analog form into a digital signal form, such as PCM and DM. Channel encoding refers to error correction encoding that adds additional bits to pure information bits to detect and correct bit errors occurring during transmission. In addition, the line encoding is an encoding that enables efficient transmission of digital bits through a wired transmission path in a baseband manner, and includes an analog mark inversion (AMI) and a high density binary-n (HDB-n).

However, in recent years, MP3 files (hereinafter referred to as MP3) files which digitally encode music using encoding techniques for converting speech into digital signals as described above have been widely used. The MP3 file can be compressed to 50 times the size of a normal CD while maintaining sound quality close to a CD. Due to such excellent sound quality and compression ratio, it is widely used for AOD and Internet FM radio broadcasting on the TCP based Internet. In addition, many of the high quality music compressed using the MP3 file can be copied and transmitted as it is. For example, you can insert a CD into a PC's CD-ROM drive, extract the songs, compress them from 130 to 150 MP3s at once, and then transfer them over PC or the Internet. In addition, such Internet or PC communication users can download and enjoy many of these songs. Recently, a separate MP3 player capable of playing such MP3 files has been developed and widely used, and these MP3 music files are also widely used. Wireless headphones and infrared communication means are used to listen to music wirelessly.

Next, a process of generating an audio transmission / reception apparatus according to the related art, that is, an MP3 file and listening to the wireless headphones will be described with reference to FIG. 1. As shown in FIG. 1, a conventional device is connected to a PC (hereinafter referred to as a personal computer; 70) and a wired interface, for example, by connecting a USB or RS232C port to interface an MP3 file transferred from the PC 70. And a memory card 72 for storing the MP3 file of the PC 70 transmitted by the interface unit 71 as much as the memory capacity, and for reproducing the MP3 file stored in the memory card 72 as an audio signal. A digital signal processor (DSP) chip unit 73 and a microcomputer 75 including the DSP chip unit 73 to control overall functions of the MP3 player 74 are included.

In addition, a speaker 76 for outputting an audio signal to the DSP chip unit 73 is connected to the outside, and a key panel unit 77 for inputting a user's command is connected to one end of the microcomputer 75. In addition, when the audio signal from the DSP chip unit 73 is to be received by the wireless headphone, a modulator for modulating the audio signal by infrared communication means and transmitting the same to the headphone includes a demodulator for receiving and demodulating the modulated signal. Included.

On the other hand, looking at the operation of the conventional audio transceiver as described above, first, when the user selects the desired song through the key panel unit 77, the microcomputer 75 recognizes this to the memory card 72 The stored MP3 file is loaded into the DSP chip unit 73. Then, the microcomputer 75 applies a drive control signal to the DSP chip unit 73 so that the DSP chip unit 73 reproduces the input MP3 file as a voice signal and emits it to the outside through the speaker 76. . At this time, if the user wants to download the MP3 file stored in the mass storage space of the PC 70 to the memory card 72 of the MP3 player 74, the interface unit 71 of the MP3 player 74 and the PC 70 ) Should be connected by cable (78). When the user sets the MP3 file transfer function to the PC 70, the MP3 file of the PC 70 is transmitted to the interface unit 71 of the MP3 player 74 through a cable. Then, the microcomputer 75 of the MP3 player 74 recognizes the MP3 file transfer through the interface unit 71, interfaces the MP3 file through the interface unit 71, and stores the MP3 file in order in the memory card 72. Then, if necessary, the user can listen to the newly downloaded MP3 file through the MP3 player 74. If you want to listen to music wirelessly through the wireless headphones (xx), send the modulated audio signal to the wireless headphones by using infrared communication means, the wireless headphones receive the modulated signal and demodulate it so that you can listen to the desired music. .

However, the above-mentioned music transmitting and receiving device of the related art has a very limited storage space of a memory card capable of storing MP3 files, and thus it is not possible to continuously play MP3 files desired by the user, and also to use another storage space (PC ( In case of downloading the desired MP3 file from 70), the MP3 file should be transferred after connecting the cable, that is, the transmission cable. In order to listen to music by using a music, if there is an obstacle between the transmitting device and the receiving device, there is a problem that the music is cut off due to the communication and the communication distance is very short.

Accordingly, the present invention has been invented to solve the above-mentioned problems of the prior art, by using the audio output device itself as a sound source, without limiting the memory, but using a wireless LAN of multiple channels (eg, 8 channels) It is an object of the present invention to provide an apparatus capable of transmitting audio signals simultaneously (1: n) or individually (1: 1) to a far-field of a wireless LAN and listening to the received audio signals.

1 is a schematic diagram of an audio transmission and reception apparatus according to the prior art.

2 is a block diagram of a wireless transmission apparatus according to the present invention.

3 is a block diagram of a wireless receiving terminal according to the present invention.

<Detailed Description of Codes>

100: wireless transmission device 101: A / D converter

102: wireless transmission modem 103: antenna

104: optical module 105: modulator

106: control unit 107: RF transmission module

108: ID authentication unit 109: DATA conversion module

110: audio output device 200: wireless receiving terminal

Audio multi-channel wireless transceiver according to the present invention for achieving the above object, the audio signal transmitted from the audio output device 110, for example, converts the signal of the DVD, TV or VTR into a WLAN signal The wireless transmitter 100 and a plurality of wireless receiving terminal 200 for receiving and processing the wireless audio signal transmitted from the wireless transmitter in a wireless LAN method to restore the original audio signal.

In addition, the wireless transmitter 100 is an A / D converter 101 and the A / D converter for converting an analog audio signal, such as a DVD, TV or VTR signal transmitted from the audio output device 110 into a digital signal A wireless transmission modem 102 converts an audio signal converted into a digital signal from a converter into a wireless LAN signal and wirelessly transmits the signal to a plurality of wireless receiving terminals 200 located within a predetermined distance.

Here, the wireless transmission modem 102 modulates and outputs the digital audio signal input from the A / D converter 101, and the audio signal modulated by the modulator is loaded on a high frequency signal. R / F transmission module 107 for wireless transmission, and a control unit 106 for controlling the overall function of the wireless modem including the R / F transmission module.

In addition, the control unit 106 is connected to the ID authentication unit 108 for authenticating the ID signal input from the key panel unit (not shown) to allow use of the wireless transmission device.

Another embodiment of the wireless transmission apparatus of the present invention is to process an audio signal, such as a DVD, TV, VTR, etc. converted into an optical signal from the optical module of the audio output device 110 as an optical signal through an optical cable The optical module 104 may be connected.

Each of the wireless receiver terminals 200 includes a wireless receiving modem 202 for receiving a wireless audio signal transmitted from the wireless transmitting apparatus 100 through a wireless LAN and restoring an original signal, and the wireless receiving modem ( D / A converter 201 for converting the digital audio signal demodulated by 202 into an analog signal, speaker 210 and headphones for transmitting the audio signal output from the D / A converter 201 to the outside. 211.

The wireless receiving modem 202 is an RF receiving module 207 for converting an audio signal wirelessly transmitted from the wireless transmitting device 100 into an IF signal, and an IF type audio input from the RF receiving module 207. A demodulator 205 for demodulating the signal into a baseband signal and demodulating the converted baseband audio signal, and the demodulator 205 to provide a function of the radio reception modem 202. A control unit 206 for controlling overall.

The control unit 206 is also connected to the ID authentication unit 208 for authenticating the ID signal input from the key panel unit (not shown) to the wireless receiver terminal 200.

In another embodiment of the wireless receiving terminal 200 of the present invention, an audio signal converted from an optical module 104 of the audio output device 110 into an optical signal, such as a DVD, a TV, a VTR, or the like through an optical cable. An optical module 204 for processing optical signals is connected.

Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings. 2 is a block diagram of the radio transmitting apparatus of the present invention. 3 is a block diagram of the present invention wireless receiving terminal.

First, the user turns on the audio output device 110 to perform the necessary audio transmission and reception through the key panel unit of the wireless transmission device 100, and selects a channel to be transmitted and switches the corresponding channel. The control unit 106 of the transmitter 100 recognizes and drives the radio transmitter 100. Then, the analog signal input through the audio output device 110 is converted into a digital signal through the A / D converter 101 of the wireless transmission device 100 and the digital signal is input to the wireless transmission modem (102) do. The wireless transmission modem 102 modulates the input audio signal according to the function control signal of the controller 106 and then inputs it to the RF transmission module 107. Then, the RF transmission module 107 processes the digital signal of the input radio transmission modem 103 into an RF signal in accordance with a medium access control (MAC) format, and transmits the signal to an individual or multiple radio receiver terminals 200.

Meanwhile, as in the above process, the wirelessly transmitted audio signal is received by the R / F receiving module 207 of the individual or multiple wireless receiving terminals 200 and accordingly the RF receiving module 207 receives the input wireless audio signal. Is converted into an IF signal and input to the radio reception modem 202. The demodulator 205 of the radio receiving modem 202 demodulates the input wireless audio signal into the original signal and inputs the demodulated signal to the D / A converter 201. The D / A converter 201 restores the input digital audio signal back to an analog signal and transmits the same through the speaker.

If only the other party is required to transmit the audio signal, if the other party's ID is input using the key panel unit, the control unit 106 authenticates the ID signal and grants the user permission to use the radio transmitter 100. In this case, the transmitted audio signal is output only from the wireless receiver terminal 200 in which the ID of the authorized counterpart is confirmed.

In addition, when transmitting the audio signal converted into the optical module, the optical signal is connected to the optical module 104 for processing the optical signal through the optical cable to transmit the audio signal.

As described above, the present invention uses the audio output device itself as a sound source while simultaneously or separately (1: 1 or 1: n) the original sound of the audio output device through a plurality of wireless LANs to a far distance of the WLAN. There is an effect that can be transmitted and received without physical and space constraints, such as connecting cable.

Claims (3)

A wireless transmission device converts and transmits an audio signal transmitted from an audio output device into a signal of a wireless LAN method, and receives and processes a wireless audio signal transmitted from the wireless transmission device in a wireless LAN method to restore the original audio signal. An audio multi-channel wireless transceiver comprising a plurality of wireless receiving terminals. The wireless transmission apparatus includes an A / D converter for converting an analog audio signal transmitted from an audio output device into a digital signal; It is composed of a wireless transmission modem for converting the audio signal converted into a digital signal from the A / D converter into a wireless LAN signal and wirelessly transmitting to a plurality of wireless receiver terminals located within a certain distance, The wireless transmission modem includes a modulator for modulating and outputting a digital audio signal input from the A / D converter; An R / F transmission module for wirelessly transmitting an audio signal modulated by the modulator to a high frequency signal; It includes a control unit for controlling the overall function of the wireless modem, including the R / F transmission module, The control unit, an audio multi-channel wireless transceiver, characterized in that the ID authentication unit to authenticate the ID signal input from the key panel unit to enable the use of the wireless transmission device connected. The wireless receiving terminal includes: a wireless receiving modem for receiving a wireless audio signal transmitted through a wireless LAN from a wireless transmitting device and restoring an original signal; A D / A converter for converting a digital audio signal demodulated by the radio receiving modem into an analog signal; Speaker and headphone for transmitting the audio signal output from the D / A converter to the outside, The wireless receiving modem includes an RF receiving module for converting an audio signal wirelessly transmitted from the wireless transmitting device into an IF signal; A demodulator for converting IF signals of the IF type inputted from the RF receiving module into, for example, baseband signals and demodulating the converted baseband audio signals; It includes a control unit for controlling the overall function of the radio receiving modem including the demodulator, And an ID authentication unit for authenticating use of the ID signal inputted from the control unit key panel unit to the wireless receiving terminal.