KR20070071760A - Voice recording method in mobile communication device and mobile communication device thereof - Google Patents

Abstract

A voice recording method in a mobile communication terminal and the mobile communication terminal thereof are provided to store voice signals of both sender and receiver in one file by using a bit rate change of a variable speed vocoder, and to reproduce the signals when necessary, thereby recording voices of both sender and receiver. A variable speed vocoder compares bit rates individually corresponding to a coded first digital voice signal and the second digital voice signal inputted for decoding(S205,S210). Based on the compared results, one of the first and second digital voice signals is selectively stored(S215). The stored digital voice signal is reproduced.

Description

Voice recording method in mobile communication device and mobile communication device

1 is a block diagram of a mobile communication terminal to which a voice recording method according to an embodiment of the present invention is applied;

FIG. 2 is a view referred to for describing the operation of the vocoder part of FIG. 1;

3 is a flowchart provided to explain a voice recording method according to an embodiment of the present invention; and

4 is a diagram referred to describe a data format stored in a voice recording method according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: communication unit 120: input and output unit

130: memory unit 140: control unit

150: vocoder section 160: codec section

165: microphone 170: speaker

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice recording method and a mobile communication terminal. More particularly, the present invention relates to a mobile terminal capable of storing and reproducing voice signals of a sender and a receiver using a bit rate change of a variable speed vocoder. A voice recording method in a communication terminal and a mobile communication terminal thereof.

In general, an optimal coding of a voice signal is required in a mobile communication system to increase a limited function and use efficiency of a wireless section. Currently, mobile operators use Lucent's Enhanced Variable Rate Coder (EVRC) scheme for 8kbps transmission and Qualcomm Code Excited Linear Prediction (QCELP) coding scheme for 13kbps transmission. The transmission rate also increases in response to the bit rate, but the higher the transmission rate, the higher the energy required for transmission. Thus, the capacity of the entire radio section is reduced.

Meanwhile, a vocoder refers to a device that performs a function of coding a digital voice signal by a large amount of signal compression or decoding a coded digital voice signal. In code division multiple access (CDMA) and the like, a variable speed vocoder is used. In the absence of a voice signal, the variable speed vocoder may be coded at a reduced coding rate, and may be coded and transmitted at a maximum speed when there are many voice signals. That is, the vocoder can vary the bit rate according to the amount of the audio signal.

However, in the conventional mobile communication terminal, the voice signal of the sender or the receiver is coded or decoded by the vocoder through different paths. Accordingly, in order to record and play back voice signals of both the sender and the receiver, a coded digital voice signal of the sender and the receiver is stored separately, and during reproduction, the decoded voice signals are decoded and summed and output. Doing.

However, in general, when looking at the characteristics of the call on the mobile terminal, it is extremely rare for the sender and the receiver to speak at the same time. In other words, when one of the sender and the receiver speaks, the other is most often listening. Therefore, since the state of the call line is bidirectional, but the actual use is unidirectional like a walkie-talkie, it is possible to consider a method of storing and reproducing voice signals of both a sender and a receiver by using these characteristics.

Accordingly, an object of the present invention is to provide a voice recording method and a mobile communication terminal in a mobile communication terminal capable of storing and reproducing voice signals of both a receiver and a receiver together.

Voice recording method of a mobile communication terminal according to the present invention for achieving the above object, in a mobile communication terminal having a variable speed vocoder, a second digital voice signal coded in the variable speed vocoder and the second input to be decoded Comparing bit rates respectively corresponding to the digital voice signals, and selectively storing any one of the first and second digital voice signals based on the comparison result. Preferably, the method further comprises reproducing the stored digital voice signal. In the storing, the bit rate information corresponding to the digital voice signal to be stored is preferably stored together.

On the other hand, a mobile communication terminal according to the present invention includes a variable speed vocoder whose bit rate is variable when coding according to the amount of the voice signal, and a first digital voice signal coded by the vocoder and a second digital voice signal input to be decoded. And a controller configured to selectively store any one of the first and second digital voice signals based on a result of comparing the bit rates corresponding to the respective ones.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

In the mobile communication terminal according to the present invention, the voice recording method of the caller and the receiver is given priority to the current speaking party, and the voice signal of the caller and the receiver is stored in a single file, so that the caller and the receiver are naturally Use a method that makes you feel like you are talking on the phone.

1 is a block diagram of a mobile communication terminal to which a voice recording method according to the present invention is applied. Referring to FIG. 1, the mobile communication terminal includes a communication unit 110, an input / output unit 120, a memory unit 130, a control unit 140, a vocoder unit 150, a codec unit 160, and a microphone 165. , And a speaker 170.

The communication unit 110 performs signal processing for wireless communication with a base station through an antenna, a duplexer filter for separating transmission and reception signals from an antenna, a power amplifier for amplifying a transmission signal, a frequency upward change circuit of a transmission path, and a reception path. Frequency down-change circuit, and the like. The input / output unit 120 includes a keypad including a plurality of keys including numeric keys and function keys, and an LCD (Liquid Crystal Display) for displaying a signal reception state and battery information of the other party during a call. The memory unit 130 includes a ROM, a RAM, a flash memory, and the like, and stores programs and data necessary for operating a mobile communication terminal, and various data that a user wants to store.

The vocoder unit 150 codes and outputs a voice signal input through the codec unit 160 by a signal compression process, decodes the coded digital voice signal transmitted from the controller 140, and transmits the decoded digital voice signal to the codec unit 160. do. The vocoder unit 150 may vary the bit rate at the time of coding according to the amount of the voice signal.

The codec unit 160 converts a signal output from the microphone 165 that converts an acoustic signal into an electrical signal into a signal that can be processed by the vocoder 150, and converts the signal output from the vocoder 150 into the speaker 170. To convert to a playable signal. The speaker 170 converts the signal output from the codec unit 160 into an acoustic signal and outputs the sound signal. In addition, the controller 140 controls the overall operation of the mobile communication terminal.

FIG. 2 is a diagram referred to for describing an operation of the vocoder unit of FIG. 1. Referring to FIG. 2, the vocoder unit 150 includes an encoder unit 151 and a decoder unit 153.

The encoder unit 151 codes the voice signal transmitted from the codec unit 160 according to the set bit rate and transmits the encoded audio signal to the controller 140. In this case, the bit rate to be coded may vary according to the amount of the voice signal. The decoder 153 decodes the coded digital voice signal transmitted from the controller 140 and transmits the decoded digital voice signal to the codec unit 160.

3 is a flowchart provided to explain a voice recording method in a mobile communication terminal according to an embodiment of the present invention. Referring to Figures 1 to 3, the voice recording method in the mobile communication terminal according to an embodiment of the present invention will be described.

 First, when the voice recording mode is selected through the input / output unit 120 by the user, the operation starts (S205). If it is not the voice recording mode, the operation according to the selected mode is executed (S240).

In the voice recording mode, the controller 140 corresponds to a bit rate corresponding to Tx, which is a digital voice signal coded and output from the vocoder 150, and Rx, which is a digital voice signal input to be decoded by the vocoder 150. The bit rates are compared (S210). As a result of the comparison, if the bit rate corresponding to Rx is higher, this corresponds to the case where the receiver is currently speaking, and therefore, Rx is stored in the memory unit 130 (S215). If the bitator corresponding to Tx is higher, this corresponds to the case where the caller speaks, and thus stores Tx in the memory unit 130 (S220). This process is repeatedly performed until the end of recording (S235). Therefore, by such a process, it is possible to store the voice signals of the sender and the receiver together in one file.

4 is a diagram referred to describe a data format stored in a voice recording method according to an embodiment of the present invention. As shown in Fig. 4, digital audio signals corresponding to Tx and Rx are stored in one file over time. In this case, bit rate information corresponding to the digital voice signal to be stored is also stored.

As such, when the digital voice signal stored in one file is input to the vocoder unit 150, the digital voice signal may be reproduced through the codec unit 160 and the speaker 170. Therefore, the voice signal of the sender and the receiver can be stored and reproduced together.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

As described above, according to the present invention, in a mobile communication terminal having a variable speed vocoder, the voice signals of the sender and the sender can be stored together in one file by using the bit rate change of the variable speed vocoder, and if necessary, Can play. Therefore, by a relatively simple method, it is possible to record the voice of the sender and the receiver together in the mobile communication terminal.

Claims (6)

In the voice recording method in a mobile communication terminal having a variable speed vocoder, Comparing bit rates corresponding to the first digital voice signal coded in the variable rate vocoder and the second digital voice signal input to be decoded; And And selectively storing any one of the first and second digital voice signals based on the comparison result. The method of claim 1, Reproducing the stored digital voice signal; Voice recording method in a mobile communication terminal further comprising. The method of claim 1, In the storing, the voice recording method of the mobile communication terminal characterized in that the bit rate information corresponding to the digital voice signal is stored together. A variable speed vocoder for varying the bit rate during coding according to the amount of speech signal; And Select one of the first and second digital voice signals based on a result of comparing bit rates corresponding to the first digital voice signal coded by the vocoder and the second digital voice signal input to be decoded, respectively. And a control unit for storing the mobile communication terminal. The method of claim 4, wherein And a memory unit for storing the digital voice signal selected from the first and second digital voice signals. The method of claim 4, wherein speaker; And And a codec unit for converting the signal output from the vocoder unit into a signal reproducible by the speaker and outputting the signal to the speaker.

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