KR100428717B1 - Speech signal transmission method on data channel - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for transmitting and receiving a voice file on a wireless data channel and a computer readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

The present invention provides a method of transmitting and receiving a voice file for transmitting a compressed voice to a data channel by selectively using an EVRC vocoder in a data communication in a wireless communication network and a computer-readable recording medium having recorded thereon a program for realizing the method. To do so.

3. Summary of Solution to Invention

According to an aspect of the present invention, there is provided a method of transmitting and receiving a voice file in a wireless communication network, the method comprising: detecting, by a wireless communication terminal, a data channel connection and interrupt occurrence detection in a data channel connection state; A voice file transmission step of operating the vocoder by the wireless communication terminal when the interrupt occurs according to a user's request, compressing the voice spoken by the user, loading the data into a data, and transmitting the data to a server through a data channel; And a voice file reproducing step of operating, by the wireless communication terminal, the vocoder to decode and reproduce the voice file provided from the server through a data channel when an interrupt is generated according to a command from the server.

4. Important uses of the invention

The present invention is used for wireless Internet service.

Description

Speech file transmission method on data channel

The present invention relates to a method of transmitting and receiving a voice file on a wireless data channel of a wireless communication network and a computer-readable recording medium recording a program for realizing the method. CODEC) A vocoder (VOCODER) is selectively used in data communication to transmit a compressed voice to a data channel. That is, even when using a data channel, it is possible to selectively transmit the compressed voice using the EVRC codec.

At present, with the rapid development and expansion of information and communication technology, mobile communication technology and its services have become an integral part of modern life. In this situation, users' desires are expanding day by day, and the development of new services to satisfy them has become very important.

Until now, there have been many attempts to apply the technology representing voice recognition to various ARS / IVR systems of wired / wireless telephone networks, but in particular, wireless networks have not achieved the expected effects due to the limitations in sound quality. In addition, since only voice has been transmitted on a call channel, there is a problem that voice recognition technology cannot be used on the wireless Internet using a WAP (Wireless Application Protocol).

That is, in general, when a call is connected to a data channel, the VOCODER, which is a codec part, is bypassed, and the transmission of analog voice itself (or voice code modulation (PCM) type voice) is performed. Its capacity is so large that it is not suitable for bandwidth-constrained wireless data communications. Therefore, the data channel and the voice channel must be completely separated.

Therefore, in the current technical field, there is an urgent need for a method of transmitting a voice file on a wireless data channel such as a WAP having a bandwidth limitation.

SUMMARY OF THE INVENTION The present invention has been proposed to meet the above requirements, and a method and method for transmitting and receiving a voice file for transmitting a compressed voice to a data channel by selectively using an EVRC vocoder in a data communication in a wireless communication network Its purpose is to provide a computer readable recording medium having recorded thereon a program.

1 is an exemplary configuration of a wireless communication terminal to which the present invention is applied.

2 is an explanatory diagram showing a general vocoder processing procedure.

3 is an explanatory diagram showing a process of transmitting and receiving a voice file on a general voice (data word deletion) channel.

4 is an explanatory diagram showing a process of transmitting and receiving a voice file on a general wireless data channel.

5 is a flowchart illustrating a method for transmitting and receiving a voice file on a wireless data channel according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: Vocoder (CODEC)

According to an aspect of the present invention, there is provided a method of transmitting and receiving a voice file in a wireless communication network, the method comprising: detecting a data channel connection and interrupt occurrence in a data channel connection state, the wireless communication terminal detecting the occurrence of an interrupt; A voice file transmission step of operating the vocoder by the wireless communication terminal when the interrupt occurs according to a user's request, compressing the voice spoken by the user, loading the data into a data, and transmitting the data to a server through a data channel; And a voice file reproducing step of operating the vocoder at the time of the interruption according to the command from the server to decode and reproduce the voice file provided from the server through a data channel. do.

In addition, according to the present invention, after performing the voice file transmission step, the server detects that the voice is from the header information of the data, decodes the voice, restores the voice, and performs a voice internet service function corresponding to the voice. It further comprises the steps of performing the restoration and service.

On the other hand, the present invention provides a wireless communication network having a processor for transmitting and receiving a voice file on a wireless data channel, the data channel connection and interrupt generation detection function for detecting the occurrence of an interrupt in the wireless channel, in the data channel connection state; A voice file transmission function in which the wireless communication terminal operates a vocoder at the time of an interruption according to a user's request, compresses the voice spoken by the user, loads it into data, and transmits the data to a server through a data channel; And a program for realizing a voice file reproducing function of operating the vocoder at the time of an interrupt in response to a command from the server to decode and reproduce the voice file provided from the server via a data channel. Provide a computer readable recording medium.

In addition, the present invention, after performing the voice file transmission function, the server detects that the voice from the header information of the data, decodes the voice to restore the voice, and performs a corresponding wireless Internet service function corresponding to the voice file Provided is a computer readable recording medium having recorded thereon a program for further realizing restoration and service performance functions.

The present invention relates to a method for transmitting and receiving a voice file in a wireless data channel including a WAP, and it is impossible to send analog voice itself (or PCM type voice) in the wireless data channel. Pass the built-in EVRC vocoder. When passing through the EVRC vocoder, a line spectral pair (LSP) parameter is extracted, which can be significantly reduced in size than a conventional PCM type voice file and thus can transmit the extracted parameter. In this case, the parameter may be transmitted in a packet type, and the receiver may restore the original audio file through the decoder.

Therefore, according to the present invention, since loss does not occur because of data transmission, a higher quality voice can be transmitted than when using a speech channel, and a high recognition rate can be obtained even in voice recognition. In addition, when using a wireless Internet service (for example, n.Top, magic N, etc.), a variety of services in which voice is added in addition to a text-oriented service becomes possible. That is, the EVRC codec can be selectively used in the data channel to transmit the compressed voice, so that the data channel and the voice channel are not completely distinguished, and even though long voice is difficult (with bandwidth problem), one or two words or short sentences are provided. Voices can be transmitted over the data channel in compressed form via the EVRC codec.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a wireless communication terminal to which the present invention is applied and shows a structure of a known code division multiple access (CDMA) mobile communication terminal.

However, since the hardware environment of the wireless communication terminal having the configuration as shown in FIG. 1 is only a technique well known in the art, detailed description thereof will be omitted herein. However, the vocoder 10 will be described in detail.

Direct transmission of a large PCM type voice file via a wireless data channel is not possible because of its capacity and thus passes the vocoder 10. When passing through the vocoder 10, a line spectrum pair (LSP) parameter is extracted, and the LSP parameter is significantly reduced in size than a conventional PCM type voice file. Restore the original voice file via the decoder at.

In general, most wireless communication operators use the 8 kbps EVRC vocoder 10.

Vocoder 10 is a device for converting an analog voice signal into a digital voice signal. In this process, the vocoder 10 compresses a large amount of signals. That is, it has a large compression effect while digitizing the analog audio signal.

The vocoder 10 applied to the CDMA is a variable rate vocoder, and is transmitted at 1.2 kbps to 8 kbps according to the number of voice signals. In addition, in the vocoder 10, speech is generally processed in units of 20 ms. EVRC vocoder 10 is developed by "Lucent", "Motorola", "Nokia", etc., and complements the problems of the existing 8kbps Qualcomm Coded Excited Linear Predictive (QCELP).

Referring to FIG. 2, referring to a voice processing process of the vocoder 10, an analog voice signal (PCM type voice) enters the input of the vocoder 10, and the vocoder 10 converts the voice signal in units of 20 ms. After digitization, the feature is extracted and the compressed LSP parameters are output. That is, the speech signal is converted into a value that can be better modeled in the frequency band. A lot of compression takes place in this process, and finally the voice is converted into LSP parameters and transmitted.

In a wireless communication network, when a communication channel between a terminal and a base station is viewed, a voice communication channel is generally referred to as a traffic channel, becomes a circuit channel, and a wireless data communication channel is generally called a data channel. This is called a packet channel. At this time, the call processing process inside the terminal is as follows.

First, during voice communication, an analog voice signal is compressed and converted into a digital voice signal through the vocoder 10 as shown in FIG. 3.

On the other hand, in the data communication, unlike the voice communication of FIG. 3, the vocoder 10 portion is bypassed. Because there is an assumption that only texts and data are processed, there is no consideration for voice.

However, in a video service that must include not only image information but also voice, consideration of voice / audio is essential and it must be possible to efficiently transmit voice on a data channel as shown in FIG.

In general, when a call is connected to a data channel, the vocoder 10 portion is bypassed, and the capacity of transmitting analog voice itself (or voice of PCM type) is too large to limit bandwidth. It is not suitable for wireless data communication. Thus, as shown in Figs. 3 and 4, the data channel and the voice channel are completely separated.

Considering the above two issues, we propose the following voice file transmission / reception process over wireless data channel. The voice file transmission / reception program on the wireless data channel is stored in a memory and operated under the control of a control unit.

Currently, the software of the terminal, which is designed to bypass the vocoder 10 unconditionally by software when connecting the data channel, is modified to be selectively bypassed. That is, even when connected to a data channel, when a user presses a certain key (for example, "*" or "#"), the microphone input is enabled and the vocoder 10 is operated to make the voice spoken by the user. After encoding, the LSP parameter in the form of compressed voice, which is its output, is treated like general data and transmitted to the server. In addition, when there is a command from the server during the data channel connection, the operation of the vocoder 10 and the speaker is reversely enabled to decode and output the received voice / audio file in the same manner as general data. .

That is, as shown in FIG. 3 and FIG. 4 is not fixed for each channel, it is possible to selectively when the data channel is connected to utilize the function of the vocoder 10. That is, in the present invention, the EVRC codec is selectively used in the data channel to transmit the compressed voice. In this case, the data channel and the voice channel are not completely separated as shown in FIGS. 3 and 4, and although the long voice is somewhat difficult due to a bandwidth problem, the voice such as one or two words or short sentences is compressed in the EVRC codec. The data channel can be transmitted.

5 is a flowchart illustrating a method of transmitting and receiving a voice file on a wireless data channel according to the present invention.

As shown in FIG. 5, in the method of transmitting and receiving a voice file on a wireless data channel according to the present invention, first, in a data channel connection state 501, an interrupt (a user inputs a specific key (for example, "*", "#"). When a user request signal generated by pressing ") or a server command signal from the server) is generated (502), the type of interrupt is analyzed (503).

As a result of the analysis, if the generated interrupt is a user request signal, the vocoder 10 is operated while the microphone input is enabled (504) to compress the voice spoken by the user and then compress the output (Output). The LSP parameter in the form of the voice is treated like general data and transmitted to the server (505, 506).

Thereafter, the server detects the speech from the header information of the data, restores the speech after decoding (507), and performs a corresponding function corresponding to the speech (508). The corresponding function will be described later.

On the other hand, if the interrupt is a command signal of the server, the operations of the vocoder 10 and the speaker are enabled to decode and reproduce the received voice / audio file in the same manner as general data (509, 510).

Accordingly, the following services are available in a terminal supporting a voice file transmission / reception process over a wireless data channel.

First, access the wireless Internet service such as "n.Top" or "magic N" and ignore the complicated tree structure menu and press specific key (for example, "*", "#") to select the desired menu. Utters. At this time, the spoken voice is encoded and transmitted as data, and the server determines that the voice is voice based on the header information of the data and processes the voice to go directly to the desired information screen through the voice recognizer. Through such a service, a user interface of a small and inconvenient terminal can be improved to add a Voice User Interface (VUI) to a wireless Internet user access method.

Second, it is possible to apply speaker authentication using voice as well as a password as a means of identity authentication such as mobile commerce (Mobile Commerce). In other words, after the desired identity with the desired object, a specific promised password is generated to increase security. At this time, the server commands the vocoder enable (Enable) from the terminal, and the spoken password is encoded and transmitted to the server in the same manner as general data. After the speaker authentication, if recognized as the correct user, the mobile commerce process (MobileCommerce Process) continues.

Third, it is possible to improve the difficulty in reading long mails on a small screen in an E-mail transmission function provided through a wireless Internet service. After the E-mail transmission, if the user selects the voice listening function, the server converts the E-mail to voice through TTS (Text-to-Speech), etc., and then compresses the E-mail to the terminal through the EVRC module. Thereafter, the terminal can provide a mail reading service to the user by enabling the vocoder and the speaker, decoding the voice, and outputting the voice to the speaker.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

The present invention as described above, by enabling the use of voice even in the data channel connection state, to escape the text-oriented wireless Internet service to the wireless Internet service that can support voice and text and speaker authentication wireless commerce through voice Service, wireless mail reading service is available, and it can be useful for many parts that need simultaneous service of data and voice.This is different from WTA 2.0 of WAP 2.0, which holds data channel and voice channel simultaneously. By enabling the support, there is no need to develop additional software such as billing, which can maximize profits of network operators.

Claims (6)

In the voice file transmission and reception method in a wireless communication network, A data channel connection and interrupt generation detection step of detecting, by the wireless communication terminal, occurrence of an interrupt in a data channel connection state; A voice file transmission step of operating the vocoder by the wireless communication terminal when the interrupt occurs according to a user's request, compressing the voice spoken by the user, loading the data into a data, and transmitting the data to a server through a data channel; And A voice file reproducing step in which the wireless communication terminal operates the vocoder to decode and reproduce a voice file provided from the server through a data channel when an interrupt is generated according to a command from the server. Voice file transmission and reception method over a wireless data channel comprising a. The method of claim 1, After performing the voice file transmission step, the server detects that the voice is from the header information of the data, decodes the corresponding voice to restore the voice, and restores the voice file to perform the corresponding wireless Internet service function corresponding to the voice. Voice file transmission and reception method over a wireless data channel further comprising. The method of claim 2, The wireless Internet service function, A method of transmitting and receiving a voice file on a wireless data channel, comprising a wireless Internet service capable of supporting voice and text, a speaker authentication wireless commerce service, and a wireless mail reading service. The method according to any one of claims 1 to 3, The wireless communication terminal, Even when connected to the data channel, the microphone input is enabled according to the user's request to compress the voice uttered by the user through the vocoder, and then output the compressed voice spectrum as the output. Treats pair (LSP) parameters to the same as general data and transmits them to the server, and enables the operation of the vocoder and the speaker according to commands from the server during data channel connection, and receives them in the same manner as general data. A method of transmitting and receiving a voice file on a wireless data channel, characterized by decoding and outputting the decoded voice / audio file. In a wireless communication network having a processor for transmitting and receiving a voice file on a wireless data channel, A data channel connection and interrupt generation detection function for detecting, by the wireless communication terminal, occurrence of an interrupt in a data channel connection state; A voice file transmission function in which the wireless communication terminal operates a vocoder at the time of an interruption according to a user's request, compresses the voice spoken by the user, loads it into data, and transmits the data to a server through a data channel; And When an interrupt occurs according to a command from the server, the wireless communication terminal operates the vocoder to decode and reproduce a voice file provided from the server through a data channel. A computer-readable recording medium having recorded thereon a program for realizing this. The method of claim 5, wherein After performing the voice file transmission function, the server detects that the voice is from the header information of the data, decodes the voice, restores the voice, and performs a voice file restore and service performing function corresponding to the voice. A computer-readable recording medium that records a program for further realization.