KR20060129713A - Device and Method for Noise Reduction of Mobile Communication Terminal - Google Patents

Abstract

The present invention relates to a technique for removing background noise of a sign language by controlling a sign language volume level of a mobile communication terminal using an Rx bit rate during a call.

To this end, the present invention provides a first process for monitoring the Rx bit rate of a sign language during a voice call; And if the first Rx bit rate is detected for a predetermined time, adjusting the volume level output from the speaker to a speaker to a predetermined level to reduce the loudness of the sign language. If the second Rx bit rate is detected for a predetermined time while the attenuation is attenuated, a third process of restoring the loudness of the sign language is performed by adjusting the volume level output from the sign language to a speaker to a level set by a user. It is characterized by including.

Description

Apparatus and method for canceling receive voice noise signal in mobole phone}

1 is a block diagram of an apparatus for removing noise of a sign language of a mobile communication terminal according to an embodiment of the present invention.

2 is a flowchart for explaining a method of removing a sign language noise of a mobile communication terminal according to an embodiment of the present invention.

** Description of symbols for the main parts of the drawing **

100: control unit 110: RF unit

120: baseband processing unit 125: signal processing unit

130: Rx bit rate detection unit 140: Vocoder

150: codec 160: display unit

170: input unit 180: memory

The present invention relates to an apparatus and method for removing a handset noise of a mobile communication terminal, and more particularly, to remove a background noise of a handset by controlling a sign language volume level of a mobile communication terminal using an Rx bit rate during a call. It's about technology that makes it possible.

In general, a mobile phone including a mobile phone or a personal communication service having a voice call function processes a voice signal input through a microphone to a voice signal of a caller. Transmitting the corresponding RF signal to the other side, and processing the RF signal corresponding to the receiver voice signal received through the antenna to output to the speaker, thereby providing a voice call service using a mobile communication terminal.

In order to ensure a satisfactory call quality, the mobile communication terminal must guarantee the quality of the voice signal of the receiver, which is output through the speaker. Actively researched.

As part of the above attempt, Korean Patent Laid-Open Publication No. 2002-0096125 proposes a technique for hardware-adjusting the gain of a transmitter of a mobile communication terminal using a variable resistor.

However, according to the above-described prior art, there is proposed a method of reducing noise by uniformly lowering the gain for the entire sign language, which is a voice signal and a background sound of the actual counterpart. In view of the above, since the gain is reduced even for the voice signal of the normal counterpart, the user may feel inconvenient to listen to the voice signal of the counterpart.

In this case, the user does not output the other party's voice signal at the volume level set by the user, and the other party's voice signal is output at the volume level lower than the user's volume level due to gain adjustment. You may feel uncomfortable, such as a hard to hear signal.

In this case, the user may adjust the volume level to increase the volume level, but in this case, the volume level is forcibly lowered regardless of the volume level set in the mobile communication terminal. Even if the user attempts to adjust upward, the volume level of the sign language does not increase to the level desired by the user.

As a result, the user may be dissatisfied with the handset processing performance of the mobile communication terminal.

In order to solve the above-described problem, the present invention provides a mobile phone by adjusting the gain (volume level) of a sign sound only when a background sound of a dial tone is detected using an Rx bit rate in a mobile communication terminal. It aims to remove noise efficiently.

In order to achieve the above object, the apparatus for removing a handset noise of a mobile communication terminal according to the present invention includes a vocoder for converting a data packet for a handset signal received through an antenna into voice information data, and converting the voice information data. A mobile communication terminal having a codec for converting an analog signal to generate a sign language and adjusting a volume of the sign language, the mobile communication terminal comprising: an Rx bit rate detector for detecting an Rx bit rate for the sign language from the data packet; On the basis of the Rx bit rate detection signal output from the Rx bit rate detector, the background noise area and the voice call area are detected, and the codec is controlled to adjust the volume level downward in the background noise area, and the volume level in the voice call area. And a control unit for controlling the codec to maintain the preset volume level.

A method for removing a sign language noise of a mobile communication terminal according to the present invention includes: a first step of monitoring an Rx bit rate of a sign language during a voice call; And if the first Rx bit rate is detected for a predetermined period of time, adjusting the volume level output from the speaker to the speaker to a predetermined level, thereby reducing the magnitude of the sign language.

Preferably, the method for removing a sign language noise of a mobile communication terminal according to the present invention further comprises: when the second Rx bit rate is detected for a predetermined time while the loudness of the sign language is attenuated, the user is provided with a volume level at which the sign language is output to the speaker. The method may further include a third process of upwardly adjusting the level to set the level of the sign language.

In the present invention, preferably, the first Rx bit rate is 1/8 Rx bit rate and the second Rx bit rate is 1/4 Rx bit rate.

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

FIG. 1 is a block diagram of an apparatus for removing a handset noise of a mobile communication terminal according to an exemplary embodiment of the present invention, and focusing on components constituting an Rx path for reproducing a handset received through an antenna.

As shown in FIG. 1, the apparatus for removing a sign sound noise of a mobile communication terminal according to an embodiment of the present invention includes a control unit 100, an RF unit 110, a baseband processing unit 120, a signal processing unit 125, An Rx bit rate detector 130, a vocoder 140, a codec 150, a display unit 160, an input unit 170, and a memory 180 are provided.

The control unit 100 performs a function to control the overall device, so that a user can use a voice call service or a data communication service, and in particular, the control unit 100 in the present invention, Rx bit rate detection unit 130 to be described later Identifying the phonological background noise on the basis of the Rx bit rate provided by, and reducing the volume level of the phonological sound by transmitting a volume control signal to the codec 150 when the phonological background noise is detected. Perform the function of removing.

In addition, the control unit 100 stores the environmental conditions of the mobile communication terminal set through the key input unit 170 in the memory 180 so that the mobile communication terminal is operated by the environmental conditions set by the user. The environmental conditions may be volume level adjustment, ring tone selection, alarm function setting, morning call function setting, and the like.

The RF unit 110 down-converts the RF signal received through the antenna, converts the RF signal into an intermediate frequency signal, and outputs the signal to the baseband processor 120.

The baseband processor 120 performs baseband processing on the intermediate frequency signal from the RF unit 110, and then converts the baseband analog signal into a digital signal and outputs the digital signal to the signal processor 125.

The signal processor 125 demodulates and symbol combines the digital signal output from the baseband processor 120, deinterleaves and decodes the received symbol-coupled received data to generate error-corrected information bits, and then stores the data packet. Output to the vocoder 140 in the form.

The Rx bit rate detector 130 detects the Rx bit rate from the data packet output from the signal processor 125 and outputs the detection result to the controller 100. In the present invention, the Rx bit rate is a parameter that is determined according to the presence or absence of voice. In more detail, the CDMA network transmits and receives voice signals at unll, 1/8, 1/4, 1/2, and full rate according to the presence or absence (strength) of the voice signal to reduce the network load. If 8K EVRC (IS-127) is used as the voice signal, transmission is performed at 1Kbps, 2Kbps, 4Kbps, and 8Kbps depending on the presence or absence of the voice signal, where Rx bit rates are 1/8, 1/4, 1/2, becomes full The Rx bit rate is also transmitted to the vocoder 140 and used as a parameter for decoding the voice signal.

The vocoder 140 converts the data packet output from the signal processor 125 into a PCM signal and outputs it to the codec 150. The codec 150 converts the PCM signal output from the vocoder 140 into an analog voice signal. Output to the speaker SP.

In the present invention, the codec 150 adjusts the volume level of the audio signal output to the speaker SP under the control of the controller 100, and the volume level with respect to the background noise of the sign language under the control of the controller 100. By lowering, the output signal is attenuated to remove the sign language background noise.

In addition, the display unit 160 is generally composed of an LCD, and performs a function of displaying a series of situations according to a signal reception state or a key input by a user.

The input unit 170 is a means for selecting a function desired by the user or inputting information, and various elements such as a keypad, a jog shuttle, a point stick, and a touch screen may be used.

The memory 180 stores necessary programs and data for operating the mobile communication terminal, and also stores a program corresponding to an algorithm for performing a method for removing a sign sound noise of the mobile communication terminal.

Hereinafter, with reference to the flowchart shown in Figure 2 will be described in detail a method of removing a ring tone noise of a mobile communication terminal according to an embodiment of the present invention.

When the mobile communication terminal is connected to an arbitrary terminal, the control unit 100 reads the volume level stored in the memory 180 so that the codec 150 can process a call sound at the volume level.

On the other hand, the sound is transmitted to the RF unit 110 through the antenna is converted into an IF signal, and then converted to a digital signal in the baseband processing state in the baseband processing unit 120. Subsequently, the digital signal is converted into a digital packet by the signal processing unit 125, converted into a PCM signal by the vocoder 140, and then converted into an analog signal by the codec 150 and output to the speaker SP. .

In this process, the Rx bit rate detector 130 detects the Rx bit rate from the digital packet output from the signal processor 125 and transmits the detection result to the controller 100, and the controller 100 transmits the Rx bit rate detector 130. Rx bit rate is monitored on the basis of the result of the Rx bit rate detection transmitted from step S4. Herein, the Rx bit rate detection result is one of null, 1/8, 1/4, 1/2, and full rate in the case of CDMA. In general, for a normal voice call, the Rx bit rate is greater than 1/4 Rx bit rate.

In view of this, the control unit 100 of the present invention uses the Rx bit rate detection result output from the Rx bit rate detection unit 130 to determine whether 1/8 Rx bit rate is detected for a predetermined time (for example, 10 frames) ( S6) If a 1/8 Rx bit rate is detected for a predetermined time (Yes in S6), it is determined as a section (ie, background noise section) in which there is no other party's voice signal.

According to the determination result, the control unit 100 commands the codec 150 to adjust the volume level down. By the above command, the codec 150 lowers the volume level of the audio signal output to the speaker SP to a predetermined value, thereby attenuating the magnitude of the sign language (S8).

Subsequently, the controller 100 determines whether the corresponding call is terminated by the user (S10). If the state in which the call is not terminated is maintained, the controller 100 determines whether a 1/4 Rx bit rate is detected for a predetermined time (S12).

As a result of the determination, if a 1/4 Rx bit rate is detected for a predetermined time (YES in S12), it is determined as a section in which the other party's voice signal exists.

According to the determination result, the control unit 100 instructs the codec 150 to adjust the volume level upward, so that the volume level of the audio signal output to the speaker SP maintains the volume level set by the user. Restore the size (S14). In this case, the controller 100 controls the volume level of the codec 150 based on the volume level stored in the memory 180.

Thereafter, the controller 100 proceeds to S4 and continuously monitors the Rx bit rate based on the Rx bit rate detection result transmitted from the Rx bit rate detector 130.

On the other hand, if the determination result of S12 indicates that 1/4 Rx bit rate is not detected during the predetermined time period (No in S12), the control unit 100 proceeds to S10 while maintaining the volume level downward adjustment in the codec 150. The process of S10 to S14 described above is repeatedly performed.

As described above, according to the apparatus and method for removing a sign language noise of a mobile communication terminal according to an embodiment of the present invention, the number of noises determined as background noise in adjusting the volume level of a sign language software by using the Rx bit rate Since the volume level is selectively adjusted downward only for the harmonics, there is an effect that the background noise that can be generated while the other voice is not transmitted can be effectively removed.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (7)

A vocoder for converting a data packet of a sign language signal received through an antenna into voice information data, and a codec for converting the voice information data into an analog signal to generate a sign sound and adjusting a volume of the sign language; In the mobile communication terminal, An Rx bit rate detector for detecting an Rx bit rate for the sign language from the data packet; On the basis of the Rx bit rate detection signal output from the Rx bit rate detector, the background noise area and the voice call area are detected, and the codec is controlled to adjust the volume level downward in the background noise area, and the volume level in the voice call area. And a control unit for controlling the codec to maintain the preset volume level. The method of claim 1, wherein the control unit And a 1/8 Rx bit rate is detected for a predetermined time based on the Rx bit rate detection signal, and the area is determined as the background noise area. The method of claim 2, wherein the control unit The sign language of the mobile communication terminal according to the Rx bit rate detection signal, when the background noise area is detected and the 1/4 Rx bit rate is detected for a predetermined time, the area is determined as the voice call area. Noise canceller. A first step of monitoring an Rx bit rate of a sign language while a voice call is in progress; And And if the first Rx bit rate is detected for a predetermined period of time, adjusting the volume level output from the loudspeaker to a speaker to a predetermined level to reduce the loudness of the loudspeaker. How to remove sign language noise 5. The method according to claim 4, wherein the loudness of the sign language is attenuated. If a second Rx bit rate is detected for a predetermined time, the method further includes a third step of restoring the volume of the sign language by adjusting the volume level output from the speaker sound to a speaker to a level set by a user. A method for removing noise by the handset of a mobile communication terminal. The method of claim 4, wherein the first Rx bit rate is A method for canceling a handset noise in a mobile communication terminal, characterized in that 1/8 Rx bit rate. 6. The method of claim 5, wherein the second Rx bit rate is A method for canceling a ring tone noise in a mobile communication terminal, characterized in that the 1/4 Rx bit rate.

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