KR100703222B1 - A method for transmitting stereo audio signal - Google Patents

Abstract

The present invention relates to a stereo audio signal transmission method implemented to transmit and receive a left audio signal and a right audio signal included in a stereo audio signal through different communication channels.

The stereo audio signal transmission method of the present invention includes a transmitter 100 for wirelessly transmitting a stereo audio signal, and a radio including first and second receivers 210 and 220 for receiving a stereo audio signal from the transmitter 100. In a stereo audio signal transmission method applied to a stereo audio system, a first communication channel between the transmitter 100 and the first receiver 210 and a second communication channel between the transmitter 100 and the second receiver 220. Communication channel setting step of setting each differently (S100); And when a stereo audio signal to be transmitted is generated, the left audio signal of the stereo audio signal is transmitted to the first receiver 210 through the first communication channel, and the right audio signal of the stereo signal is transmitted through the second communication channel. A transmission step (S200) for transmitting to the second receiver 220.

Stereo Audio System, Signal Transceiver, Wireless, Communication Channel, Transmission Packet

Description

How to send stereo audio signals {A METHOD FOR TRANSMITTING STEREO AUDIO SIGNAL}

1 is a block diagram of a conventional wireless stereo audio system.

2 is a procedure showing a conventional stereo audio signal transmission method.

3 is a block diagram of a wireless stereo audio system for carrying out the present invention.

4 is a flow chart showing a stereo audio signal transmission method according to the present invention.

5 is an explanatory diagram of a frequency hopping and time division scheme according to the present invention;

Explanation of symbols on the main parts of the drawings

100: transmitter

210: first receiver

220: second receiver

The present invention relates to a stereo audio signal transmission method applied to a wireless stereo audio system. In particular, a left audio signal is implemented by transmitting and receiving a left audio signal and a right audio signal included in a stereo audio signal through different communication channels. The present invention relates to a stereo audio signal transmission method capable of reducing interference between an audio signal and a right audio signal, thereby improving the quality of an audio signal.

In general, a wireless stereo audio system using a 2.4 GHz ISM frequency band wirelessly transmits left and right stereo audio signals using an 802.11b / g wireless LAN and a Bluetooth module. In such a wireless stereo audio system, left and right stereo audio signals must be transmitted and received without loss of signals due to interference or the like.

In order to wirelessly transmit and receive audio signals, such a wireless stereo audio system should be equipped with, for example, one of a wireless LAN communication module and a Bluetooth communication module, and to a wireless stereo audio system using a wireless LAN communication module. This will be described with reference to FIG. 1.

1 is a block diagram of a conventional wireless stereo audio system.

The conventional wireless stereo audio system illustrated in FIG. 1 includes a transmitter 10 for transmitting an audio signal using a wireless LAN communication module and a wireless communication module for receiving audio signals from the transmitter 10. It consists of the first and second receivers 21 and 22.

For example, the transmitter 11 may correspond to a music player or a radio device, and the first and second receivers 21 and 22 may correspond to a left speaker and a right speaker.

In the conventional wireless stereo audio system, the transmitter 10 wirelessly transmits an audio signal to the first and second receivers 21 and 22 by using the same channel, and at this time, the first and second receivers ( 21 and 22 respectively receive audio signals from the receiver 10 over the same channel.

This process will be described with reference to FIG. 2.

2 is a flowchart illustrating a conventional stereo audio signal transmission method.

Referring to FIG. 2, first, the transmitter 10 establishes a communication channel with the first and second receivers 21 and 22 (S21).

Referring to this communication channel setting, the transmitter 10 broadcasts to the first and second receivers 21 and 22 using the respective channels in order from among a plurality of predetermined channels, thereby requesting a probe request ( probe request), and when a probe response is unicasted from the first and second receivers 21 and 22 in the corresponding channel, the channel is transmitted to the first and second receivers 21, Set each to communication channel with 22).

Thereafter, the transmitter 10 transmits an audio signal generated by using a communication channel with the first and second receivers 21 and 22, and thus the first and second receivers 21 and 22 The audio signal from the transmitter 10 is transmitted using a communication channel (S31, S32).

However, in the conventional method of transmitting and receiving audio in the wireless stereo audio system, since the communication channels with the first and second receivers are set to the same channel, the first audio signal and the second audio signal transmitted from the transmitter interfere with each other. There is a problem that causes.

Due to such interference, there is a problem in that the quality of the audio signal is degraded, such as a phenomenon in which the wireless audio signal is momentarily disconnected. In severe cases, the loss of the audio signal may be caused.

In this case, there is a difficulty in retransmitting the lost audio signal because there is a large amount of signal to be processed, and the number of retransmissions is limited. As a result, the number of retransmissions for a packet or frame is reduced.

The present invention has been proposed to solve the above problems, and its object is to implement the left audio signal and the right audio signal to be transmitted and received through different communication channels included in the stereo audio signal, the left audio signal and the right The present invention provides a method for transmitting stereo audio signals that can reduce interference between audio signals and thereby improve the quality of audio signals.

In order to achieve the above object of the present invention, the stereo audio signal transmission method of the present invention includes a transmitter for wirelessly transmitting a stereo audio signal, and a first and a second receiver for receiving a stereo audio signal from the transmitter. A stereo audio signal transmission method applied to a wireless stereo audio system, comprising: a communication channel configured to set a first communication channel between the transmitter and the first receiver and a second communication channel between the transmitter and the second receiver differently; Setting step; And when a stereo audio signal to be transmitted is generated, the left audio signal of the stereo audio signal is transmitted to the first receiver through the first communication channel, and the right audio signal of the stereo signal is transmitted through the second communication channel. It characterized in that it comprises a transmission step for transmitting to.

In the transmitting step, when a stereo audio signal to be transmitted is generated, a transmission packet is formed to form a first transmission packet including a left audio signal among the stereo audio signals and a second transmission packet including a right audio signal among the stereo signals. step; And transmitting the first transmission packet to the first receiver through the first communication channel, and transmitting the second transmission packet to the second receiver through the second communication channel. do.

In the setting of the communication channel, the first communication channel may be set in a frequency hopping method in a predetermined order in a first frequency band.

The transmitting may include transmitting the first transmission packet and the second transmission packet in a time division manner.

In addition, the method of the present invention, while using the first and second communication channels separated from each other, while monitoring the signal loss of the first and second communication channel, when the signal loss occurs even after retransmission in any one communication channel The method may further include changing the channel where the signal loss occurs to another channel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

3 is a block diagram of a wireless stereo audio system for carrying out the present invention.

Referring to FIG. 3, in the wireless stereo audio system for implementing the present invention, the first and second communication channels are set differently, and the left audio signal of the generated stereo audio signals is wirelessly transmitted through the first communication channel. A transmitter 100 wirelessly transmitting a right audio signal of the stereo audio signal through a second communication channel, and a first receiver receiving a left audio signal of stereo audio signals from the transmitter 100 through a first communication channel; 210, and a second receiver 220 for receiving a right audio signal of a stereo audio signal from the transmitter 100 through a second communication channel.

4 is a flowchart showing a stereo audio signal transmission method according to the present invention.

In FIG. 4, in step S100, a first communication channel between the transmitter 100 and the first receiver 210 and a second communication channel between the transmitter 100 and the second receiver 220 are differently set. to be. When a stereo audio signal to be transmitted is generated, S200 transmits the left audio signal of the stereo audio signal to the first receiver 210 through the first communication channel, and transmits the right audio signal of the stereo signal to the second communication channel. Transmitting to the second receiver 220 through.

In operation S210, when a stereo audio signal to be transmitted is generated, a first transmission packet including a left audio signal among the stereo audio signals is formed, and a second transmission packet including a right audio signal among the stereo signals is formed. S220 transmits the first transmission packet to the first receiver 210 through the first communication channel, and transmits the second transmission packet to the second receiver 220 through the second communication channel. Step.

5 is an explanatory diagram of a frequency hopping and time division scheme according to the present invention.

In FIG. 5, (a) is a conceptual explanatory diagram illustrating the first and second communication channels differently, and (b) is an exemplary view of the first and second transmission packets transmitted through the first and second communication channels. (c) is an exemplary diagram of frequency hopping in each of the first and second communication channels, and (d) is a diagram illustrating frequency hopping and time division in each of the first and second communication channels.

Hereinafter, the operation and effects of the present invention will be described in detail with reference to the accompanying drawings.

3 and 5, a stereo audio signal transmission method in a wireless stereo audio system of the present invention will be described.

First, the transmitter 100 of the wireless stereo audio system of FIG. 3 cooperates with the first and second receivers 210 and 220 to establish a first communication channel between the first receivers 210 and further includes a second receiver ( A second communication channel between 220 is set. In this case, the transmitter 100 sets the first communication channel and the second communication channel differently to reduce signal interference with each other (S100).

In addition, in the communication channel setting step (S100), the transmitter 100 may set the first communication channel in a frequency hopping manner in a predetermined order in a predetermined first frequency band.

For example, as illustrated in FIG. 5, the first communication channel is determined in the order of frequency hopping in order of channel 1 (CH 1), channel 2 (CH 2), and channel 3 (CH 3). In addition, the second communication channel is determined by frequency hopping in the order of channel 4 (CH4), channel 5 (CH5), and channel 6 (CH6).

Next, when a stereo audio signal to be transmitted is generated, the transmitter 100 transmits the left audio signal of the stereo audio signal to the first receiver 210 through the first communication channel, and transmits the right audio signal of the stereo signal. It transmits to the second receiver 220 through the second communication channel (S200).

This transmission step will be described in detail.

In the transmitting step (S200), first, when the stereo audio signal to be transmitted is generated (S210), the transmitter 210 forms a first transmission packet including a left audio signal of the stereo audio signal, and the right of the stereo signal. A second transmission packet including an audio signal is formed (S220).

Next, the transmitter 100 transmits the first transmission packet to the first receiver 210 through the first communication channel, and transmits the second transmission packet to the second receiver through the second communication channel. In step S230, it is transmitted to (220). This process is repeated until it is finished.

In this case, the transmitter 100 may transmit the first transmission packet and the second transmission packet in a time division (TDD) manner.

For example, referring to FIG. 5, each of the first transmission packet and the second transmission packet is transmitted through the first and second communication channels determined by the frequency hopping method, and is time-divided into each other at different times. Can be transmitted, further reducing signal interference.

On the other hand, the method of the present invention, while using the first and second communication channels separated from each other, while monitoring the signal loss of the first and second communication channel, when the signal loss occurs even after retransmission in any one communication channel Therefore, the channel where the signal loss occurs can be changed to another channel. Accordingly, communication quality can be improved.

As described above, in the present invention, when a stereo audio signal is transmitted and received using a frequency hopping method, a hopping interval between left and right is separated and transmitted, and the left and right Data is divided into time slots and transmitted in a time division (TDD) manner. That is, by dividing the low band and the high band around the center frequency of the 2.4 GHz ISM band, each channel of left and right communicates in a frequency hopping manner in the corresponding frequency band. In this case, it is possible to prevent a situation in which an audio signal of a left and a right channel may be simultaneously lost due to a WLAN interference signal of a fixed band 22 MHz band. Accordingly, it is possible to prevent the audio sound of left and right from being completely cut off.

In addition, when the left or right channel signal in the separated frequency band is broken by the wireless LAN signal and is not properly received, the left and right audio using the same channel are used. When the signal is retransmitted, its size is smaller than that of the data to be processed, and error correction is faster, and the number of retransmissions can be increased up to 2 times compared to the conventional method, thereby improving audio quality.

In addition, by dividing left and right audio data, the size of the packet can be reduced, thereby reducing the packet error rate, and the left and right in separate frequency bands. When using the (Right) signal and data loss occurs after a certain number of retransmissions in one of the frequency bands, the channel can be communicated to another band to improve the quality of the audio signal.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, but is defined by the claims, and the apparatus of the present invention may be substituted, modified, and modified in various ways without departing from the spirit of the present invention. It is apparent to those skilled in the art that modifications are possible.

According to the present invention as described above, in the stereo audio signal transmission method applied to the wireless stereo audio system, by implementing to transmit and receive the left audio signal and the right audio signal included in the stereo audio signal through different communication channels, The interference between the left audio signal and the right audio signal can be reduced, thereby improving the quality of the audio signal.

Claims (5)

A stereo audio signal transmission method applied to a wireless stereo audio system including a transmitter for wirelessly transmitting a stereo audio signal and first and second receivers for receiving a stereo audio signal from the transmitter. A communication channel setting step of differently setting each of a first communication channel between the transmitter and the first receiver and a second communication channel between the transmitter and the second receiver; And When a stereo audio signal to be transmitted is generated, a left audio signal of the stereo audio signal is transmitted to the first receiver through the first communication channel, and a right audio signal of the stereo signal is transmitted to the second receiver through the second communication channel. Sending step Stereo audio signal transmission method comprising a. The method of claim 1, wherein the transmitting step, Generating a first transmission packet including a left audio signal among the stereo audio signals and a second transmission packet including a right audio signal among the stereo signals when a stereo audio signal to be transmitted is generated; Transmitting the first transmission packet to the first receiver through the first communication channel, and transmitting the second transmission packet to the second receiver through the second communication channel. Stereo audio signal transmission method comprising a. The method of claim 2, wherein the setting of the communication channel, And setting the first communication channel in a frequency hopping manner in a preset order in a first preset frequency band. The method of claim 2, wherein the transmitting step, And transmitting the first transmission packet and the second transmission packet in a time division manner. The method of claim 1, While using the first and second communication channels separated from each other, while monitoring the signal loss of the first and second communication channels, if a signal loss occurs after retransmission in any one of the communication channels, And changing to another channel.

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