KR100668686B1 - Codec setting error correction method in mobile communication terminal and mobile communication terminal performing same - Google Patents

Abstract

The present invention relates to a method for correcting a codec setting error in a mobile communication terminal and a mobile communication terminal performing the same.

When receiving voice slot data from a mobile communication network, the present invention analyzes the voice slot data and identifies a codec used for encoding sound source data inserted into a data field of the voice slot data, thereby matching the codec with the mobile communication network. A mobile communication terminal for performing a function of correcting an error of a codec setting by checking whether a voice codec is provided, the voice codec for decoding and outputting voice data inserted into the voice slot data and transmitted during a voice call; A multimedia audio codec that decodes and outputs the music data transmitted by being inserted into the voice slot data as music data transmitted from a CRBT server providing a coloring ring back tone (CRBT) service; And driving the voice codec when receiving a control message indicating the start of a voice call from the mobile communication network, and driving the multimedia audio codec when receiving a control message indicating the transmission of a ringback tone, wherein the multimedia audio codec is driven. In case of receiving the voice slot data, the multimedia number is determined by checking an order number inserted in the data field for each received voice slot data and determining that there is an error in codec setting if the voice slot data is not received in order. When the voice codec is received while the voice codec is driven while the voice codec is driven, the voice codec is inserted into the data field for each received voice slot data. Order number And a codec controller for performing a second function of limiting driving of the voice codec and driving the multimedia audio codec when the voice slot data is received in order to determine that there is an error in codec setting. Provided is a mobile communication terminal that performs a function of correcting a codec setting error.

According to the present invention, when a ringback tone service is provided using a multimedia audio codec in a ringback tone section and a multimedia audio codec using a voice codec in a voice call section, the mobile communication network and the mobile station are moved due to an error occurring in a call processing process. Even if a problem occurs that the codecs of the communication terminals do not coincide with each other, the mobile communication terminal automatically determines this and changes the codec setting, thereby providing a normal ringback tone service.

Ring Back Tone, Multimedia Audio Codec, Voice Codec, Error, Mobile Phone

Description

Codec Setup Error and Mobile Communication Terminal Performing Same}

1 is a diagram illustrating a call procedure for a ringback tone service applying a multimedia audio codec and a voice codec by dividing a ringback tone interval and a call interval;

2 is a diagram illustrating a process of mapping an HE-AAC frame to slot data of a CDMA voice call channel;

3 is a diagram illustrating a mapping relationship with sequence numbers when ADTS header information indicating a start point of an HE-AAC frame is mapped to a CDMA voice channel;

4 is a diagram illustrating a method for correcting a codec setting error in a mobile communication terminal during an incoming call waiting service according to a preferred embodiment of the present invention, when the mobile communication terminal is set to an HE-AAC codec, a mobile communication system using a sequence number field; Flowchart showing a method for correcting codec setting error by checking whether codecs between mobile terminals match.

5 is a diagram illustrating a codec setting error correcting method in a mobile communication terminal during an incoming call waiting service according to an exemplary embodiment of the present invention, when the mobile communication terminal is set to an EVRC codec, a mobile communication system and a mobile communication using a sequence number field; Flowchart showing how to correct codec setting errors by checking whether codecs match between devices.

FIG. 6 is a diagram briefly illustrating a configuration of a mobile communication terminal that performs a codec setting error correction function in an incoming call waiting service according to an exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

600: RF signal processor 610: channel decoder

620: signal processing unit 630: codec control unit

640: multimedia audio codec 650: voice codec

The present invention relates to a method for correcting a codec setting error in a mobile communication terminal and a mobile communication terminal performing the same. More specifically, the codec set in the mobile communication terminal is identified by identifying the codec used for encoding the sound source data inserted into the data field of the voice slot data using the sequence number of the voice slot data received from the mobile communication terminal. The present invention relates to a method of correcting a codec setting error when it does not match a codec used for encoding sound source data, and a mobile communication terminal performing the same.

As computers, electronics, and communication technologies have advanced rapidly, various wireless communication services using wireless networks have been provided. The most basic wireless communication service is a wireless voice call service that provides a voice call to a mobile terminal user wirelessly, which can provide a service regardless of time and place. In addition, while providing a text message service to complement the voice call service, a wireless Internet service has recently emerged to provide an Internet communication service to a user of a mobile communication terminal through a wireless communication network.

Accordingly, the subscribers of the mobile communication service can freely move and talk with the other party anytime and anywhere using the wireless communication service, and also have various information necessary for life through the wireless Internet service, for example, news, weather, sports, securities, Exchange rates or traffic information may be provided in various forms such as text, voice, or image.

As a result of the development of mobile communication technology, services provided by a code division multiple access (CDMA) mobile communication system are not only voice services, but also circuit data and packets. It is developing into a multimedia communication service for transmitting data such as data.

Recently, the IS-95C network, which has evolved from the existing IS-95A and IS-95B networks, transmits up to 307.2 Kbps, which is much faster than the 14.4 Kbps or 56 Kbps data rate that can be supported in the IS-95A and IS-95B networks. It offers wireless internet at speed. In particular, by using IMT-2000 service, it is possible to provide various multimedia services (AOD, VOD, etc.) at higher speed as well as improving existing voice and WAP service quality.

On the other hand, in recent years, a ring back tone (RBT) service or a so-called coloring ring back tone (CRBT), which allows a user to hear various sounds designated by the called party of the mobile communication terminal as a call waiting tone from the other party's mobile terminal or a general telephone. , Hereinafter referred to as "CRBT" service. The CRBT service provides the caller with a ringback tone specified by the called party. The CRBT service is a mechanical call waiting sound generated during an existing call, for example, the latest song or pop song, as well as the sound of birds, water, etc. It is a service that enables you to use your own prerecorded voice as ringback tone. As the ringback tone service is provided, the other party can feel auditory satisfaction by listening to the sound of a sound source designated by the called party instead of listening to a uniform mechanical ringback tone.

On the other hand, most mobile communication terminals use a voice codec having a variable transmission rate such as Enhanced Variable Rate Codec (EVRC) for efficient voice call and optimization of a wireless channel. EVRC is a software that converts the voice used in the digital mobile communication system to digital. The transmission speed is 8 kbps, and the software is a remarkable improvement in the part where the voice quality is poor. EVRC is a method of encoding speech information in accordance with the amount of speech information. In the silent section where the caller does not speak, speech encoding is performed at a low rate of information, and speech encoding is performed at a high rate when the amount of information is large. This EVRC is more efficient than the previous method of encoding at a uniform speed. By using this, the system capacity of the CDMA mobile communication system is increased, and power consumption can be saved at the same time.

However, when providing a CRBT service using an EVRC voice codec on a mobile phone, the quality of music is inevitable due to the difference in frequency and traffic characteristics of voice and music.

In order to overcome this problem, it is conceivable to modify the extracted sound source to match the EVRC, and to minimize the damage of the sound source caused by the voice codec. This work can complement the quality of the music service through the EVRC to a level equivalent to the voice quality. However, since the voice codec is designed and implemented to be suitable for a voice call, it is difficult to improve the quality of a music service.

Therefore, in order to improve the quality of music service, it is desirable to use a dedicated multimedia audio codec that can reflect the characteristics of music.

1 is a diagram illustrating a call procedure for a ringback tone service applying a multimedia audio codec and a voice codec by dividing a ringback tone interval and a call interval.

When the calling terminal attempts to connect the call to the called terminal, the calling side exchange completes the voice call setup procedure of the calling terminal by performing channel allocation and vocoder allocation along with radio resource allocation to the base station controller (S100).

Thereafter, the source exchange performs ISUP (ISDN User Part) call setup to the destination exchange in which the destination terminal is located to set up a voice call to the destination terminal, and the destination exchange performs a paging procedure to the destination terminal (S102). ).

In addition, the called side exchange performs an ISUP call setup procedure for connection with a server providing a coloring ring back tone (CRBT) service (hereinafter referred to as a "CRBT server") (S104).

Thereafter, the CRBT server transmits an ISUP_CPG message including information on the bypass mode and control information to the calling exchange (S106).

 Upon receiving the ISUP_CPG message, the calling exchange instructs the base station controller to switch to bypass mode and transmits a data burst message (DBM) requesting the switching to the multimedia audio codec to the calling terminal (S108). ).

The originating terminal receiving the data burst message converts the codec used for the voice call connection into the multimedia audio codec, and provides a high quality music service to the user by combining the bitstream of the music received from the CRBT server (S110).

Thereafter, when the called exchange receives a response message for paging from the called terminal, it transmits an ISUP_ANM informing of the fact that the called terminal responds to the calling exchange, and releases the setting of the CRBT server and the ISUP call (S112).

 The originating exchange receiving the ISUP_ANM requests the base station controller to switch to the EVRC codec if necessary, and transmits an Alert Info message informing the response of the called terminal to the originating terminal (S114).

The calling terminal receiving the Alert Info message converts the codec set as the multimedia audio codec into the EVRC voice codec to perform a voice call with the called terminal (S116).

In this way, it is possible to provide a high quality ringback tone service by using a multimedia audio codec in a ringback tone section and a voice codec in a call section.

However, in such a call processing procedure, a reception error or other failure of a data burst message or an alert info message may occur, which may cause a problem that the codec used by the calling terminal and the mobile communication system does not match each other. Voice call service cannot be provided.

In order to solve this problem, the present invention uses a sequence number of voice slot data received from a mobile communication terminal to identify a codec used for encoding sound source data inserted into a data field of voice slot data. It is an object of the present invention to provide a method of correcting a codec setting error when a set codec does not match a codec used for encoding sound source data and a mobile communication terminal performing the same.

In order to achieve the first object of the present invention, when the voice communication terminal receives voice slot data from the mobile communication network in a state where the mobile communication terminal is set as a multimedia audio codec, the voice slot data is analyzed to analyze the voice slot data. A method of correcting an error in a codec setting by identifying a codec match with the mobile communication network by identifying a codec used for encoding sound source data inserted into a data field, the method comprising: (a) the received voice slot data for each of the received voice slot data; Checking the sequence number inserted in the data field and determining that there is an error in codec setting if the voice slot data is not received in sequence; And (b) if it is determined that there is an error in the codec setting, changing the currently set multimedia audio codec to a voice codec.

In order to achieve the second object of the present invention, when the voice communication terminal receives voice slot data from the mobile communication network while the mobile communication terminal is set as a voice codec, the voice slot data is analyzed to analyze the data of the voice slot data. A method of correcting an error in a codec setting by identifying a codec match with the mobile communication network by identifying a codec used for encoding sound source data inserted into a field, the method comprising: (a) the data for each voice slot data received; Checking a sequence number (SEQ) inserted into a field and determining that there is an error in codec setting when the voice slot data is received in order; And (b) if it is determined that there is an error in the codec setting, changing the currently set voice codec to a multimedia audio codec.

In order to achieve the third object of the present invention, when receiving voice slot data from a mobile communication network, the present invention analyzes the voice slot data and is used to encode sound source data inserted into a data field of the voice slot data. A mobile communication terminal which performs a function of correcting an error in codec setting by checking a codec match with the mobile communication network by identifying a codec, and decodes and outputs voice data inserted and transmitted in the voice slot data during a voice call. Voice codec; A multimedia audio codec that decodes and outputs the music data transmitted by being inserted into the voice slot data as music data transmitted from a CRBT server providing a coloring ring back tone (CRBT) service; And driving the voice codec when receiving a control message indicating the start of a voice call from the mobile communication network, and driving the multimedia audio codec when receiving a control message indicating the transmission of a ringback tone, wherein the multimedia audio codec is driven. In case of receiving the voice slot data, the multimedia number is determined by checking an order number inserted in the data field for each received voice slot data and determining that there is an error in codec setting if the voice slot data is not received in order. When the voice codec is received while the voice codec is driven while the voice codec is driven, the voice codec is inserted into the data field for each received voice slot data. Sequence number And a codec controller for performing a second function of limiting driving of the voice codec and driving the multimedia audio codec when the voice slot data is received in order to determine that there is an error in codec setting. Provided is a mobile communication terminal that performs a function of correcting a codec setting error.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function is obvious to those skilled in the art or may obscure the gist of the present invention, the detailed description thereof will be omitted.

First, before describing a method of correcting a codec setting error in a mobile communication terminal according to a preferred embodiment of the present invention, a process of mapping music data encoded by a multimedia audio codec into slot data of a CDMA voice call channel will be described. do.

In addition, various codecs may be used as the multimedia audio codec used for encoding / decoding sound sources in the CRBT service. Here, an example of using a HE-AAC (High Efficiency Advanced Audio Coding) codec suitable for music distribution will be described. do.

HE-AAC refers to a coding system for digital audio signals which has become an international standard in ISO / IEC MPEG. Frames in AAC vary in size with compression, which reduces the overall file size. In fact, compared to MP3 files, the capacity can be reduced by up to 30%. The second advantage of AAC is its sound quality. Compared to MP3, AAC improves sound quality through two techniques, TNS and Prediction. Temporal Noise Shaping (TNS) is a quantization correction technique that intelligently reduces the errors that occur when analog continuous music data is composed of 0 and 1 digital data, reducing noise and bringing it closer to the original sound. Prediction is a value stored in TNS that is calibrated. It stores the previously calibrated information and uses the stored data the next time the same data appears. If the same sound correction value is different in the quantization step, the sound will be different. As such, AAC is superior to MP3 in terms of compression rate and sound quality.

In order to apply the HE-AAC codec to a call waiting service, the data transfer rate required for real-time decoding must be adjusted to match the transmission rate of the voice channel of the CDMA. In addition, the HE-AAC frame may be divided and transmitted as a bit stream to fit the slot structure of the CDMA voice call channel. That is, in order to adapt to the transmission rate of 8 Kbps and the channel slot structure required for the CDMA voice channel, only information within 171 bits should be transmitted in 20 ms units. However, this is only an example of applying the CDMA network, and if it is transmitted from the GSM network and the access network of the fourth generation mobile communication system to be implemented in the future, it should be configured differently according to the access network.

2 is a diagram illustrating a process of mapping an HE-AAC frame to slot data of a CDMA voice call channel.

As shown in FIG. 2, the HE-AAC frame has a variable length, is divided into a size that a 20 ms CDMA voice slot can transmit, and is transmitted through a CDMA radio link. The divided HE-AAC frames are combined by the mobile communication terminal to be reconfigured into HE-AAC frames.

In order to effectively map an HE-AAC frame to a CDMA voice slot, processing in bytes is required. That is, in the process of mapping the HE-AAC frame to the CDMA voice slot, the mapping is performed in byte units for the efficiency of software processing. Therefore, only 168 bits (21 bytes) of the 171 bits of the data field of the CDMA voice slot are used. The 3 bit data area remains as free space. Therefore, it is possible to use this for other purposes. In the present invention, the sequence number field is used.

That is, when the HE-AAC frame is divided and mapped to the CDMA voice slot, the sequence number field is represented by a binary number from "000" to "111". Information "000" is inserted into a CDMA voice slot at which a new HE-AAC frame starts, and an increment of 1 is inserted into a next voice slot for the same HE-AAC frame. This sequence number is set back to "000" when the next HE-AAC frame is inserted into the CDMA voice slot.

By using 3 bits of free space as the sequence number field, it is possible to determine whether a loss occurs in the voice slot, thereby preventing the decoding of the frame by changing the length or content of the frame.

On the other hand, when using this method, since two HE-AAC frames can be mapped in one CDMA voice slot (“a section” in FIG. 2 corresponds to this), a frame included in the CDMA voice slot data in the mobile communication terminal. Frames should be classified based on the search for the identifier. However, retrieving the frame identification delimiter for all received data incurs too much processing load. Therefore, there is a need for a method to reduce this, which also includes the start information (ADTS header) of the HE-AAC frame using the sequence number. This can be achieved by identifying CDMA voice slots.

3 is a diagram illustrating a mapping relationship with sequence numbers when ADTS header information indicating a start point of an HE-AAC frame is mapped to a CDMA voice channel.

As shown in FIG. 3, ADTS header information is included in a CDMA voice slot in which the sequence number field is set to "000". Therefore, the mobile communication terminal can reduce the processing load by searching for the frame discrimination identifier (ADTS header information) only for data in which the sequence number field is set to "000" in the received CDMA voice slot data.

By using the method described above, it is possible to prevent the problem of frame length or content change during the decoding process caused by the loss of the HE-AAC frame, and to identify the location of the CDMA voice slot including the ADTS header information. There is an advantage that the processing load of the mobile communication terminal can be reduced.

However, if the codec settings between the mobile terminal and the system do not match, no matter how efficient this method is, successful service provision is impossible.

Therefore, the following describes a method of correcting a codec setting error in a mobile communication terminal using a sequence number field.

4 is a diagram illustrating a method for correcting a codec setting error in a mobile communication terminal during an incoming call waiting service according to a preferred embodiment of the present invention, when the mobile communication terminal is set to an HE-AAC codec, a mobile communication system using a sequence number field; A flowchart illustrating a method for correcting a codec setting error by checking whether a codec is matched between mobile communication terminals.

As described with reference to FIGS. 2 and 3, when the data divided and mapped in the CDMA voice slot is a HE-AAC frame encoded by the HE-AAC codec, each CDMA voice slot data transmitted from the mobile communication network to the mobile terminal. Are assigned sequence numbers in order.

Therefore, the mobile communication terminal searches for the sequence number field of the CDMA voice slot data, and if the CDMA voice slot data is not received in sequence, determines that there is an error in the codec setting and changes the codec to the EVRC codec, which is the voice codec.

In more detail, when the mobile communication terminal receives CDMA voice slot data from the base station (S400), the sequence number (SEQ) of the sequence number field inserted in the data field of the received CDMA voice slot data is referred to as a reference sequence number. Set to (Bseq) and initialize the codec counter (Ecount) (S402).

Upon receiving the next CDMA voice slot data (S404), it is determined whether or not the sequence number (SEQ) of the received CDMA voice slot data is 1 greater than the reference sequence number (Bseq) (S406). If it is determined whether the sequence number (SEQ) is "000" (S408).

If it is not "000", the codec counter is incremented by one (S410), and it is determined whether or not the codec counter is a predetermined number (N) or more (S412).

As a result of the determination, if the predetermined number N or more, it is determined that there is an error in the codec setting, and the currently set HE-AAC codec is changed to the EVRC codec which is the voice codec (S416).

However, if the sequence number (SEQ) is one greater than the reference sequence number (Bseq) in step S406, or the sequence number (SEQ) is "000" in step S408, or the codec counter is a certain number (N) in step S412 If not, set the received sequence number (SEQ) to the reference sequence number (Bseq), and proceeds to step S404 (S414).

Here, the predetermined number N is preferably set to two or more appropriate numbers to distinguish between codec setting error and loss of CDMA voice slot data.

5 is a diagram illustrating a codec setting error correcting method in a mobile communication terminal during an incoming call waiting service according to an exemplary embodiment of the present invention, when the mobile communication terminal is set to an EVRC codec, a mobile communication system and a mobile communication using a sequence number field; A flowchart illustrating a method for correcting a codec setting error by checking whether a codec is matched between terminals.

When the mobile communication terminal receives the received CDMA voice slot data more than a predetermined number of times, the mobile communication terminal determines that the codec of the mobile communication system is the HE-AAC codec and changes the currently set EVRC codec to the HE-AAC codec.

In more detail, when the mobile communication terminal receives the CDMA voice slot data from the base station (S500), the sequence number (SEQ) of the sequence number field inserted in the data field of the received CDMA voice slot data is referred to as the reference sequence number (Bseq). ) And initialize the codec counter (Ecount) (S502).

When receiving the next CDMA voice slot data (S504), it is determined whether the received sequence number (SEQ) is one greater than the reference sequence number (Bseq) (S506). ) Is increased by 1 (S508), and it is determined whether the codec counter Ecount is equal to or greater than a predetermined number N (S512).

However, if the sequence number (SEQ) is not greater than 1 than the reference sequence number (Bseq) in step S506, it is determined whether the sequence number (SEQ) is "000" (S510). Proceed to

If the sequence number (SEQ) is not "000" in step S510 or the codec counter (Ecount) is not more than a predetermined number (N) in step S512, the received sequence number (SEQ) is set as a reference counter, and S504 Proceed to step (S514).

However, if the codec counter (Ecount) is a predetermined number (N) or more in step S512, it is determined that the codec of the mobile communication system is the HE-AAC codec, and the EVRC voice codec currently set in the mobile communication terminal is changed to the HE-AAC codec. (S516).

FIG. 6 is a diagram briefly illustrating a configuration of a mobile communication terminal that performs a codec setting error correction function in an incoming call waiting service according to an exemplary embodiment of the present invention.

The mobile communication terminal performing the codec setting error correction function during the incoming call waiting service according to the preferred embodiment of the present invention includes an RF signal processor 600, a channel decoder 610, a signal processor 620, a codec controller 630, and a voice. And a codec 640, a multimedia audio codec 650, and the like.

The RF signal processor 600 converts the wireless signal received through the antenna into a digital signal, and the channel decoder 610 decodes the digital signal received from the RF signal processor 620 to signal and data parts. The signal portion is transmitted to the signal processor and the data portion is transmitted to the codec controller 630.

When the codec control unit 630 receives a control message (Alerting Info message) for notifying the start of a voice call from the mobile communication network, the codec controller 630 drives the voice codec 650 and sets a control message (multimedia audio codec setting) for notifying transmission of a ringback tone. The multimedia audio codec 640 is driven when receiving a data burst message.

In particular, when the voice slot data is received while the multimedia audio codec 640 is driven, the codec controller 530 checks the sequence number inserted in the data field for each received voice slot data, and then the voice slot data is sequentially. If it is not received, it determines that there is an error in the codec setting and restricts the driving of the multimedia audio codec 640 and simultaneously drives the voice codec 650. This function is performed using the method described with reference to FIG. .

In addition, when the voice codec 650 receives the voice slot data while the voice codec 650 is driven, the codec controller 630 checks the sequence number inserted in the data field for each received voice slot data and sequentially receives the voice slot data. If it is determined that there is an error in the codec setting, it limits the driving of the voice codec 650 and simultaneously performs the second function of driving the multimedia audio codec 640. This function is performed through the method described with reference to FIG.

The voice codec 640 is a means for decoding voice data that is inserted into voice slot data and transmitted during a voice call. Preferably, the voice codec 640 uses an EVRC codec.

The multimedia audio codec 650 is a means for decoding music data transmitted from a CRBT server providing a CRBT service. Various audio codecs may be used, but it is preferable to use the HE-AAC codec.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, when a ringback tone service is provided using a multimedia audio codec that uses a multimedia audio codec in a ringback tone section and a voice codec in a voice call section, an error occurs during a call processing process. Therefore, even if a problem occurs that the codecs between the mobile communication network and the mobile communication terminal do not coincide with each other, the mobile communication terminal automatically determines this and changes the codec setting, thereby providing a normal ringback tone service.

Claims (17)

When the mobile communication terminal receives the voice slot data from the mobile communication network while the mobile terminal is set as the multimedia audio codec, the codec used for encoding the sound source data inserted into the data field of the voice slot data by analyzing the voice slot data. In the method for correcting the error of the codec setting by checking whether the codec match with the mobile communication network by identifying the (a) checking a sequence number inserted in the data field for each received voice slot data and determining that there is an error in codec setting when the voice slot data is not received in order; And (b) if it is determined that there is an error in the codec setting, changing the currently set multimedia audio codec to a voice codec Codec setting error correction method in a mobile communication terminal comprising a. The method of claim 1, In step (a), (a1) when the mobile communication terminal receives the voice slot data from the mobile communication network, setting a first sequence number inserted in the data field of the voice slot data as a reference sequence number and setting a codec counter to 0; ; (a2) determining whether a second sequence number of the received voice slot data is one greater than the reference sequence number the next time the voice slot data is received; (a3) if the second sequence number is one greater than the reference sequence number, setting the reference sequence number as the second sequence number and proceeding to step (a2); (a4) If the second sequence number is not one greater than the reference sequence number, it is determined whether the second sequence number is 0. If 0, the reference sequence number is set as the second sequence number. proceeding to step (a2); (a5) If the second sequence number is not 0, the codec counter is incremented by one, and it is determined whether the codec counter is greater than or equal to a predetermined number (N). Setting to the second sequence number and proceeding to step (a2); And (a6) determining that there is an error in the codec setting when the codec counter is equal to or greater than a certain number (N). Codec setting error correction method in a mobile communication terminal comprising a. The method of claim 2, The predetermined number (N) is a codec setting error correction method for a mobile communication terminal, characterized in that set to two or more. The method of claim 1, The voice slot data is voice slot data used in a code division multiple access (CDMA) mobile communication network, and has a slot period of 20 ms, and the data field has a size of 171 bits. To fix codec setting errors in. The method of claim 4, wherein The sound source data is mapped to the data field by 168 bits (21 bytes), and the remaining 3 bits of the data field are used as a sequence number field into which the sequence number is inserted. How to fix. The method of claim 1, The multimedia audio codec is HE-AAC (High Efficiency Advanced Audio Coding) characterized in that the codec setting error correction method in a mobile communication terminal. The method of claim 1, And the voice codec is an enhanced variable rate codec (EVRC) codec. When the mobile communication terminal receives voice slot data from the mobile communication network while the mobile communication terminal is set as a voice codec, the codec used for encoding the sound source data inserted into the data field of the voice slot data is analyzed by analyzing the voice slot data. A method of correcting an error in a codec setting by checking whether a codec matches with the mobile communication network by identifying the codec, (a) checking a sequence number (SEQ) inserted into the data field for each of the received voice slot data and determining that there is an error in codec setting when the voice slot data is received in order; And (b) if it is determined that there is an error in the codec setting, changing the currently set voice codec to a multimedia audio codec. Codec setting error correction method in a mobile communication terminal comprising a. The method of claim 8, In step (a), (a1) when the mobile communication terminal receives the voice slot data from the mobile communication network, setting a first sequence number inserted in the data field of the voice slot data as a reference sequence number and setting a codec counter to 0; ; (a2) Next, when the voice slot data is received, it is determined whether the second sequence number of the voice slot data is a value larger than the reference sequence number. If the value is 1, the codec counter is incremented by one (a4). Proceeding to step; (a3) If the second sequence number is not one greater than the reference sequence number, it is determined whether the second sequence number is 0. If 0, the reference sequence number is set as the second sequence number. proceeding to step a2); (a4) determining whether the codec counter is greater than or equal to a predetermined number (N), and if not equal to or greater than the predetermined number (N), setting the reference sequence number as the second sequence number and proceeding to step (a2). ; And (a5) determining that there is an error in the codec setting when the codec counter is equal to or greater than a certain number (N). Codec setting error correction method in a mobile communication terminal comprising a. The method of claim 9, And a predetermined number (N) is set to 2 or more. The method of claim 8, The voice slot data is voice slot data used in a code division multiple access (CDMA) mobile communication network, and has a slot period of 20 ms, and the data field has a size of 171 bits. To fix codec setting errors in. The method of claim 11, The sound source data is mapped to the data field by 168 bits (21 bytes), and the remaining 3 bits of the data field are used as a sequence number field into which the sequence number is inserted. How to fix. The method of claim 8, The multimedia audio codec is HE-AAC (High Efficiency Advanced Audio Coding) characterized in that the codec setting error correction method in a mobile communication terminal. The method of claim 8, And the voice codec is an enhanced variable rate codec (EVRC) codec. In case of receiving voice slot data from a mobile communication network, the voice slot data is analyzed to identify a codec match with the mobile communication network by identifying a codec used to encode sound source data inserted into a data field of the voice slot data. In the mobile communication terminal performing a function of correcting the error of the codec setting, A voice codec for decoding and outputting voice data inserted into the voice slot data and transmitted during a voice call; A multimedia audio codec that decodes and outputs the music data transmitted by being inserted into the voice slot data as music data transmitted from a CRBT server providing a coloring ring back tone (CRBT) service; And When receiving a control message indicating the start of a voice call from the mobile communication network to drive the voice codec, and when receiving a control message indicating the transmission of the ringback tone to drive the multimedia audio codec, while the multimedia audio codec is driven In the case of receiving the voice slot data, if the voice slot data is not received in order, it is determined that there is an error in the codec setting. When the voice codec is received while the voice codec is driven while the voice codec is driven, the voice codec is inserted into the data field for each received voice slot data. Sequence number (SEQ If the voice slot data is received in order, it is determined that there is an error in the codec setting, thereby limiting the driving of the voice codec and simultaneously performing the second function of driving the multimedia audio codec. A mobile communication terminal performing a function of correcting a codec setting error, characterized in that it comprises a. The method of claim 15, The first function is, (a1) when the voice slot data is received from the mobile communication network, setting a first sequence number inserted into a data field of the voice slot data as a reference sequence number and setting a codec counter to 0; (a2) determining whether a second sequence number of the received voice slot data is one greater than the reference sequence number the next time the voice slot data is received; (a3) if the second sequence number is one greater than the reference sequence number, setting the reference sequence number as the second sequence number and proceeding to step (a2); (a4) If the second sequence number is not one greater than the reference sequence number, it is determined whether the second sequence number is 0. If 0, the reference sequence number is set as the second sequence number. (a2) proceeding to the process; (a5) If the second sequence number is not 0, the codec counter is incremented by one, and it is determined whether the codec counter is greater than or equal to a predetermined number (N). Setting to the second sequence number and proceeding to step (a2); And (a6) determining that there is an error in the codec setting when the codec counter is equal to or greater than a predetermined number (N), thereby limiting the driving of the multimedia audio codec and simultaneously driving the voice codec. A mobile communication terminal performing a function of correcting a codec setting error, characterized in that performed through. The method of claim 15, The second function is, (b1) when the voice slot data is received from the mobile communication network, setting a first sequence number inserted into a data field of the voice slot data as a reference sequence number and setting a codec counter to 0; (b2) Next time, when the voice slot data is received, it is determined whether the second sequence number of the voice slot data is a value larger than the reference sequence number. If the value is 1, the codec counter is incremented by one (b4). Process to proceed; (b3) If the second sequence number is not one greater than the reference sequence number, it is determined whether the second sequence number is 0. If 0, the reference sequence number is set as the second sequence number. b2) proceeding to the process; (b4) determining whether the codec counter is greater than or equal to a predetermined number (N), and if not equal to or greater than the predetermined number (N), setting the reference sequence number as the second sequence number and proceeding to (b2) ; And (b5) if the codec counter is equal to or greater than a predetermined number N, determining that there is an error in the codec setting, restricting the operation of the voice codec and simultaneously driving the multimedia audio codec; A mobile communication terminal performing a function of correcting a codec setting error, characterized in that performed through.

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