KR100318943B1 - Vocoder Control Device and Method in European Handheld Devices for Improved Voice Quality - Google Patents

Abstract

The present invention relates to a European portable terminal (GSM) equipped with a vocoder (Vocoder) for decoding and outputting the received voice data in the call connection state, in particular, to improve the call quality to provide a more comfortable call state to the user The present invention relates to a vocoder control apparatus for a European portable terminal and a method thereof.

The present invention relates to an apparatus and method for vocoder control of a European portable terminal, comprising: a network message detecting step of detecting a network message received in a call connection and a state; and a network message decoding decoding a network message detected in the detecting step A decoding message error detection step for detecting whether an error of the network message decoded in the decoding step is detected, and a mute processing step for muting the decoded message when error detection is performed during the error detection step. An apparatus and method for controlling a vocoder of a European handheld terminal for processing the same are provided.

Description

Vocoder Control Device and Method of European Portable Terminal for Improved Call Quality

The present invention relates to a European-type portable terminal (GSM) equipped with a vocoder for decoding and outputting voice data received in a call connection state, and in particular, the European-type for improving the voice quality to provide a more comfortable call state to the user The present invention relates to a vocoder control apparatus for a portable terminal and a method thereof.

A wireless terminal system that provides a wireless call service through a time division multiple access method (TDMA) is commonly referred to as a European type wireless system (Global System for Mobile), and the subscriber terminal used in such a system is called a portable terminal or a GSM terminal. Normally called. Its system configuration, as shown in the accompanying Figure 1, the mobile station and the mobile station (MTSO) 110, which is linked to the normal public network (PSTN) 100, the transmission and reception of a wireless signal with a mobile terminal through the actual air (Air) The base station 120, and the mobile terminal 130 to enable each user to perform a call during the mobile in the mobile state. In the figure, the user of the mobile terminal 130 and each general subscriber 140 subscribed to the public network can make a call through mutual call connection. That is, the GSM network and the public network, which are composed of the base station 120, the mobile switching station 110, and a network management station not shown in the drawing, but which collectively control them, interwork with each other in addition to a call between the same network subscribers. Calls between subscribers can be made.

However, in the GSM network, a specific network includes a ringback tone message in a voice message and transmits it to the mobile terminal when attempting to connect a call. In this case, an error occurs due to an unexpected mismatch in the interworking of the public network and the GSM network. It often happens that ringback tone messages are sent to mobile terminals. At this time, the mobile terminal did not output the normal ringback tone, but an error occurred ringback tone, which caused inconvenience to the user waiting for the call. In other words, the conventional European portable terminal has a problem of transmitting a ringback tone message in a steady state or a ringback tone message in an error state without being distinguished from one another. In this case, especially when the GSM network is composed of a system developed by the Italian company 'TIM', it became more problematic. This is due to the inherent message processing process of the system, and when the GSM network is configured through this system, which is already sold and provided, a problem of degrading call sound quality due to the above causes has been generated.

On the other hand, in the European portable terminal, apart from the ringback tone error caused by the interworking between the GSM network and the public network, a problem of deterioration of voice quality is caused by an unexpected factor on the air. In this case, the voice message of which the sound quality is degraded is directly decoded and output in the audible state without being separately processed by the European portable terminal. In other words, the conventional European portable terminal decodes the received voice message as it is and outputs it as it is, so that the user has a inconvenience in having to make a call with a degraded call quality in a poor reception state. An example of such a problem is a ting noise generation problem, which is a noise generated when a user decodes and outputs a voice message in which an error occurs during a call.

Accordingly, an object of the present invention is to provide a vocoder control apparatus and method for improving call sound quality to provide a more comfortable call state to a user in a European portable terminal.

In addition, an object of the present invention, when the call connection attempts, even if the reception of the error ringback tone messages that can be generated in a specific GSM network as interworking with the general public network network is removed and at the same time as the user the ringback tone is normal The present invention provides a vocoder control apparatus and a method for generating the vocoder.

It is also an object of the present invention to solve the problem of poor voice quality caused by decoding and outputting the audible state in the case of a voice message received with an error according to an unexpected problem in the air, even though the voice quality has been degraded. The present invention provides a vocoder control device and a method of a European portable terminal.

Accordingly, in order to achieve the above objects, in the present invention, in the apparatus and method for controlling a vocoder of a European portable terminal, a network message detecting step of detecting a network message received in a call connection and a state, and a network message detected in the detecting step A network message decoding process for decoding the network message, a decoding message error detection process for detecting whether an error of the network message decoded in the decoding process, and a mute processing process for muting the decoded message when an error is detected in the error detection process We propose a vocoder control apparatus and method for a European portable terminal that performs the following.

1 is a system configuration diagram of a conventional European portable terminal system.

Figure 2a is a block diagram of a vocoder control device for improving the call sound quality through the ring back tone generation control according to an embodiment of the present invention.

Figure 2b is a flow chart illustrating a vocoder control method for improving the sound quality of the call through the ring back tone generation control in the European portable terminal according to an embodiment of the present invention.

Figure 3a is a block diagram of a vocoder control device for improving the call sound quality through the control of the received voice data according to an embodiment of the present invention.

3B is a flowchart illustrating a vocoder control method for improving call sound quality through reception voice data control in a European portable terminal according to another embodiment of the present invention.

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. Also, in the following description, many specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Figure 2a is a block diagram of a vocoder control device for improving the sound quality of the call through the ring back tone generation control according to an embodiment of the present invention.

Referring to FIG. 2A, the RF unit 200 includes a duplexer therein to output and process a radio signal transmitted from a GSM network received through an antenna ANT to the signal processing unit 210 or to process the signal processing unit ( A wireless signal to be transmitted from 210 is transmitted to the GSM network through the antenna ANT. The signal processor 210 synthesizes a radio signal processed by the RF unit 200 under the control of the controller 220 and a carrier removal signal output from a predetermined frequency synthesizer, extracts the encoded signal as a coded signal, and then outputs the vocoder 23. Will output The frequency synthesizer generates a carrier removal signal under the control of the controller 100 and outputs the generated carrier removal signal to the signal processor 210, and also generates a transmission carrier signal to generate the carrier removal signal. Will output When the RF unit 200 is synthesized through the carrier signal generated by the frequency synthesizer of the signal processor 210, the coded voice signal processed and output by the vocoder 230 under the control of the controller 100, Outputs the radio signal through the duplexer. The vocoder 230 decodes the message received from the GSM network, and if the result is a voice message, the vocoder 230 amplifies through the amplifier 280 and outputs the audible sound through the speaker SPK. Perform a decoding operation. In addition, the vocoder 230 codes an electric voice signal input through a microphone MIC and amplified by the amplifier 280 and output to the signal processor 210. This output signal is converted into a wireless signal through the above-described process and sent out. The ringback tone message detector 240 detects a ringback tone message in the voice signal decoded by the vocoder. In a typical GSM network, when a call connection is attempted from a network, a ringback tone message is received in the form of a voice message. When the received message is decoded, the ringback tone message is detected from the ringback tone message detector 240. Becomes the operation of. The ringback tone message error detector 250 detects whether the ringback tone message detected by the ringback tone message detector 240 is in an error state. That is, in determining whether a ringback tone message having an error caused by a problem on the network described in the prior art is transmitted and received, an error of the ringback tone message is detected. The controller 220 controls the overall operation of the European mobile terminal, and in particular, controls the voice processing operation of the vocoder 23 through the detection result of the error ringback tone message according to the present invention. When an error ringback tone message is detected in the ringback tone message error detecting unit 250, the vocoder 230 is controlled to mute the message having an error. Mute means processing so that the received ringback tone message is not output as an audible state after decoding. This is achieved through the control of the mute function implemented in a typical vocoder. In addition, the control unit 220 controls the output of the ringback tone to be audible by reading the ringback tone stored in the memory 260 in advance in addition to the muting process of the ringback tone message and transmitting it to the amplifying unit 280. do. The amplifying unit 280 amplifies a voice signal processed and output from the vocoder 230 and outputs it through a speaker, amplifies a voice signal applied through a microphone, and transmits the amplified voice signal to the vocoder 230. The memory 260 stores temporary data and necessary data generated according to an operation of the controller 220, and a voice message processed and output by the signal processor 210 and a voice message output from the vocoder 230. A volatile memory having a temporary buffer function and an EEPROM are typically implemented to store ring back tone messages and to operate system data, program data, and the input of a user, which are necessary for the operation of a European portable terminal according to an embodiment of the present invention. It stores data that needs to be preserved regardless of whether it is. The display unit 270 is a device for outputting predetermined information in a visible form so that a user can know various operating conditions different from the overall state and control operation of the European portable terminal, and a liquid crystal display device is usually used.

2B is a flowchart illustrating a vocoder control method for improving call quality through ring back tone generation control in a European portable terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 2B, in step 20, the mobile terminal attempts to connect with the called party through the network according to the call request of the user. Then, in step 22, a predetermined message is received from the network. The message configuration at this time will be configured according to the European wireless terminal system recommendation. In step 24, the received network message is decoded. This operation is performed through the vocoder 230 described above. In step 26, ringback tone message detection is performed from the decoded message. That is, ringback tone messages generated in response to a call connection are detected. In step 28, it is detected whether there is an error in the detected ringback tone message. The criterion of error determination may be determined from the fact that a data error of a predetermined range or more occurs in a predetermined message configuration. If it is detected in step 28 that there is an error in the ringback tone message, in step 30 the mute processing of the received message is performed. In this case, the ringback tone message included in the received network message is not output as an audible state. This is done through the control of the mute processing function provided in the normal vocoder. In step 32, the ringback tone message stored in the memory 26 is read out and output as a ringback tone in response to a call connection attempt. In this case, even if an error occurred ringback tone message is received, the errored ringback tone is not output to the user, but the previously stored ringback tone is output as clean sound quality. On the other hand, if no error is detected in the ringback tone message in step 28, the ringback tone message decoded in step 29 is output as it is. In operation 32 and 34, the method determines whether a call is connected in step 34. If the call is established, the call enters the call execution mode, and if not, the step 22 is repeated.

As a result, the operation according to the configuration of FIG. 2A and the process of FIG. 2B does not decode and reproduce the output as it is, even if the ringback tone message having an error is received by the portable terminal. It outputs only the normal ringback tone message or reproduces and outputs only the ringback tone of clean sound quality that is stored in advance.

3A is a block diagram of a vocoder control apparatus for improving call quality through receiving voice data control according to another embodiment of the present invention.

Referring to FIG. 3A, the configuration and basic operation of the RF unit 300, the signal processor 310, the vocoder 330, the amplifier 380, the controller 320, the memory 360, and the display unit 370 may be described. Same as the device referenced in FIG. 2A above. However, in the configuration of the vocoder control apparatus shown in FIG. 3A, data stored in the memory 360 is different. In addition, the operation of the controller 32 is also different. In the implementation of the present invention, the memory 360 stores the sound quality data divided according to a predetermined criterion in advance, which is the sound quality determination reference data compared with the sound quality of the received voice message as described later. In the case of the control unit 320, the overall control operation of the mobile terminal performs the same operation as the control unit shown in FIG. 2A. However, in the embodiment of the present invention, whether the vocoder is decoded is stored in the memory 360. The control is different as a result of the reference of the reference sound quality data. The new configuration shown in FIG. 3A is a reception voice message sound quality measurement unit 350 and a reception voice message detection unit 340.

Looking at the operation thereof, first, the received voice message detector 340 is extracted when the wireless signal transmitted from the received GSM network as the corresponding processed coded signal in the signal processor 310 through the RF unit 300, extracted Perform voice message detection from the message. The received voice message sound quality measuring unit 350 performs sound quality measurement according to a predetermined criterion from the detected received voice message. In the practice of the present invention, the received voice message is measured by subdividing the sound quality into seven levels. Thereafter, the controller 320 compares the measured sound quality with the sound quality previously stored in the memory 360 and controls the mute operation processing of the vocoder 330 according to the result. In this case, the mute processing operation performs the same operation as the mute function described above. The difference is that in the previous ringback tone message processing, the ringback tone is muted, and in the configuration of FIG. 3A, the received voice message is muted.

3B is a flowchart illustrating a vocoder control method for improving call quality through receiving voice data control in a European portable terminal according to another embodiment of the present invention.

Referring to this, in step 50, the mobile terminal enters a call state and performs a call. It is already in a state of making a call with the network and making a call with the called party. In step 52, the voice message is continuously received as the call is performed. In operation 54, the received voice message sound quality measurement unit 350 under the control of the controller 32 measures the sound quality of the received voice message based on the sound quality criteria. In step 56, the measured sound quality is compared with the reference sound quality previously stored in the memory 360. If the sound quality of the voice message received in step 56 is greater than or equal to a predetermined level, that is, greater than the reference sound quality previously stored in the memory 360, the voice message received in step 58 is decoded. In step 60, the audible state is output. This is an operation according to the reception of a voice message of a good sound quality to some extent. On the other hand, if it is determined in step 56 that the received voice message does not have a certain level of sound quality, in step 59, the mute processing of the vocoder 330 is controlled. The cause of the deterioration of the sound quality is caused by various factors in the air as described above. Therefore, the voice message whose sound quality is degraded according to the operation of step 59 is not decoded. As a concrete example, no ting noise occurs. After performing the operations of steps 60 and 59 and checking whether the call is terminated in step 62, the process is completed if the call is terminated. Otherwise, the operation of step 52 is repeated.

The operation of the configuration of FIG. 3A and the process of FIG. 3B is as follows. First, when the voice message received by the mobile terminal does not reach the sound quality level having a certain call quality, it is not decoded in the vocoder, and the decoding of the vocoder is limited to the voice message having the sound quality above a certain level. Call is made.

For reference, the ringback tone message and the voice message processed in the detailed description of the present invention are composed of packets in the form of a bit stream stream, and the operation is performed according to whether each packet is received. Therefore, even if the voice message is not decoded, the received voice message is decoded immediately after the voice message is decoded and output. Therefore, the user does not cause a problem such as a call not being made.

In the detailed description of the present invention, specific embodiments and specific numerical values are defined, but various modifications, extensions, and applications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention as described above can provide a vocoder control device and method for improving the call sound quality to provide a more comfortable call state to the user in the European portable terminal. In addition, when attempting to connect a call, as it is interlocked with a general public network network, there is an advantage of outputting a ringback tone in a normal state without outputting an unpleasant ringback tone caused by receiving an error ringback tone message that may be generated in a specific GSM network. When the received voice message is deteriorated in sound quality, the received voice message is not decoded and reproduced as it is, and thus there is an advantage in that the user can feel the problem of degrading the call sound quality.

Claims (5)

In the vocoder control device of a European portable terminal, A vocoder for decoding network messages received in response to a call connection attempt; A ringback tone message detector for detecting a ringback tone message from the decoded network message; A ringback tone message error detection unit for detecting whether the detected ringback tone message is an error; And a control unit configured to control muting of the ringback tone message and selection of an output to an audible state according to whether the error is detected or not. The method of claim 1, The apparatus further comprises a memory for storing a steady state ringback tone, And the control unit controls to output the audible ring state by reading out the stored ring back tone instead of the error ring back tone message when muting processing of an error ring back tone message is selected. In the vocoder control method of the European portable terminal, A first step of receiving and decoding a network message transmitted in response to a call connection attempt; Reading a ringback tone message from the decoded network message, and then detecting whether the read ringback tone message is in error; If the error is detected in the above, vocoder control method of the European mobile terminal, characterized in that the third step of muting the ringback tone message is generated. In the vocoder control device of a European portable terminal, A vocoder for decoding and muting voice messages, A voice message detection unit for detecting a voice message received in a call state; A voice message sound quality measuring unit measuring a sound quality of the detected received voice message; And a control unit for comparing the measured sound quality with a predetermined reference sound quality, and controlling decoding and muting processing of the vocoder according to a comparison result. In the vocoder control method of the European portable terminal, A first process of receiving a voice message received in a call connection state; A second step of measuring sound quality by detecting a received voice message; If it is determined that the measured sound quality is less than a predetermined predetermined reference sound quality, vocoder control method of the European portable terminal, characterized in that the third step of muting the received voice message.