KR100617660B1 - Echo canceller tuning system - Google Patents

Abstract

The present invention relates to an apparatus and method for optimizing the echo canceller (Echo Canceller), to optimize the operating environment of the echo canceller by using an optimization tuning method of the graphical user interface (GUI) development environment The present invention relates to an eco-cancell canceller tuning device and method.

The echo canceller tuning system of the present invention is a system capable of two-way audio communication based on a network, comprising: GUI input means for selecting and inputting a gain adjustment value for echo canceller tuning based on a GUI; Tuning control means for outputting the echo canceller tuning control signal corresponding to the digital value selected by the GUI input means as a digital value, by adjusting the output of the microphone and the speaker according to the tuning control signal output by the tuning control means Characterized in that it comprises a tuning means for the output of the echo canceller is transmitted through the communication network.

Ecowoo canceler, tuning

Description

Ecowoo canceller tuning device and method {ECHO CANCELLER TUNING SYSTEM}

1A is a diagram schematically illustrating the principle of acoustic echo generation;

Figure 1b schematically illustrates the principle of howling generation

2 is a diagram schematically illustrating the principle of echo canceller operation;

Figure 3 is a block diagram of an echo canceller tuning device of the present invention

4 is a flowchart of the echo canceller tuning method of the present invention.

5 is a flowchart of a method of adjusting the echo canceller gain in the present invention.

Figure 6 is a detailed flowchart of the echo canceller gain adjustment method in the present invention

<Explanation of symbols for the main parts of the drawings>

10: network 80: echo rain canceller

100: echo canceller tuning unit 200: GUI input unit

110: central processing unit (CPU) 120: input potentiometer

130: reference potentiometer 140: output potentiometer

150: input gain control unit 160: reference gain control unit

170: output gain control unit

The present invention relates to an apparatus and method for optimizing the echo canceller (Echo Canceller), to optimize the operating environment of the echo canceller by using an optimization tuning method of the graphical user interface (GUI) development environment The present invention relates to an eco-cancell canceller tuning device and method.

In each transmitting and receiving terminal, an echo phenomenon occurs when devices that use a microphone and a speaker as input and output devices are connected to each other based on a wired or wireless communication network.

1A conceptually illustrates the principle of acoustic echo generation among echo events. The communication network 10 shows a network in which the microphone 20 and the speaker 30 of the receiver (transmitter) and the microphone 40 and the speaker 50 of the transmitter (receiver) are connected. In this structure, when the audio signal input to the microphone 40 of the transmitting end is output to the speaker of the receiving end 30 via the communication network 10, the output signal of the speaker 30 is propagated in the air (path 60) to the microphone The signal is inputted to (20), and this signal is outputted to the speaker 50 of the transmitter via the communication network 10 again, so that a phenomenon in which the user hears his words like an echo occurs again, and this phenomenon (acoustic echo phenomenon) It causes inconvenience to call.

Figure 1b conceptually illustrates the principle of howling occurrence in the echo phenomenon. The communication network 10 shows a network in which the microphone 20 and the speaker 30 of the receiver (transmitter) and the microphone 40 and the speaker 50 of the transmitter (receiver) are connected. In this structure, when the acoustic echo phenomenon described above occurs in both cases at the same time, as shown in the figure, a closed loop (path 60 and path 70) of the signal is formed and the amplification of the sound is increased, resulting in a loud noise. This is howling phenomenon. This howling phenomenon is also a cause of call inconvenience.

In order to prevent such an echo phenomenon, an echo canceller 80 is provided as shown in FIG. The echo canceller 80 is a module that blocks the acoustic echo, howling phenomenon, and the like through signal processing. That is, the echo canceller 80 stores the sound signal output through the speaker, and when the same sound signal comes in through the microphone with a delay of a predetermined time (propagation time in the air), signal processing (same signal cancellation technique). ) To reduce acoustic echo and to prevent howling.

Background Art Conventionally, echo cancellers are widely used to remove echoes by hardware or software. However, even when the optimized codec algorithm is installed and used in the system, the optimum results are output when the device is used in a noisy environment, such as in-vehicle telematics. I can't do that.

In other words, even if the codec is optimally tuned, the installed position of the speaker and the microphone is different, and if it is moved, the optimum echo cancellation tuning result is changed due to the change of the noise environment according to the moving speed. It will not produce. In addition, there is a time difficulty that cannot cope with a large number of device operating environment (for example, a large number of vehicle-specific operating environment for a telematics system).

An object of the present invention is to optimize the gain value for echo cancellation by controlling the gain control portion of the microphone input stage and the reference gain control portion of the speaker with a GUI-based digital value in a network-based bidirectional audio communication system. The present invention provides an echo canceller optimization tuning device and method that can provide a foundation for maximizing the performance of optimized codec algorithms.

In addition, the present invention provides an effective tuning method in an environment with high ambient noise by controlling the gain control portion of the microphone input stage and the reference gain control portion of the speaker based on the GUI-based digital value in a network-based bidirectional audio communication system. The purpose of the present invention is to provide an echo canceller optimization tuning device and an echo canceller optimization tuning method.

In addition, the present invention in the system capable of network-based two-way audio communication, by controlling the gain control portion of the microphone input terminal and the reference gain control portion of the speaker to a digital value based on the GUI, the installation position of the microphone and the speaker is different, It is an object of the present invention to provide an echo canceller optimization tuning device and an echo canceller tuning method, which enable robust and optimized echo canceling tuning to be performed even when the noise environment changes according to the moving speed.

In addition, the present invention is a system capable of network-based two-way audio communication, by controlling the gain control portion of the microphone input stage and the reference gain control portion of the speaker to a digital value based on the GUI, audio that needs tuning based on audio gain adjustment It is an object of the present invention to provide an echo canceller tuning device and method for enabling optimal echo tuning in a communication system.

The echo canceller tuning device of the present invention for achieving the above object, in a system capable of two-way audio communication based on the network,

GUI input means for selecting and inputting a gain adjustment value for echo canceller tuning based on a GUI, and outputting an echo canceller tuning control signal corresponding to a digital value selected by the GUI input means as a digital value And tuning means for adjusting the output of the microphone and the speaker according to the tuning control signal output by the tuning control means so that the output of the tuned echo canceller is transmitted through the communication network. .

In addition, the GUI input means is characterized in that it is possible to select the gain control value for the microphone input stage, the reference gain adjustment value of the speaker stage, the gain adjustment value of the output stage as digital values, respectively.

In addition, the GUI input means selects a gain control value for the microphone input stage, a reference gain control value for the speaker stage, and a gain adjustment value for the output stage, respectively, and displays a potential difference value (resistance value) corresponding to the corresponding value. It is characterized by.

In addition, the echo canceller tuning device of the present invention for achieving the above object, in a system capable of two-way audio communication based on the network,

A GUI input means for selecting a gain adjustment value for echo canceller tuning based on a GUI, and a microphone input end, a speaker end, and an output end of the echo canceller in response to the gain adjustment value input by the GUI input means, respectively. A processor for outputting a gain adjustment value of the processor, potentiometers for outputting a corresponding gain control signal in response to the gain control value of each stage output from the processor, and an input stage gain for adjusting the gain of the microphone input terminal in response to the output value of the potentiometer. Adjusting means, reference gain adjusting means for adjusting the reference gain of the speaker stage in correspondence with the output value of the potentiometer, output stage gain adjusting means for adjusting the gain of the output stage in response to the output value of the potentiometer, and the input stage gain adjusting means. The microphone signal controlled by the gain is input, and the reference gain adjusting means Standing a reference gain is set, characterized in that configured to include a right echo canceller for supplying a signal to remove the echo right to the output gain control means.

In addition, the echo canceller tuning method of the present invention for achieving the above object, in a system capable of two-way audio communication based on the network,

Inputting a gain adjustment value for a microphone input end, a reference gain adjustment value for the speaker end, and a gain adjustment value for the output end from the GUI-based input unit for tuning, respectively; Selecting an optimum gain control value of an echo canceller by adjusting a digital value of a GUI input from the GUI input unit; Controlling and setting a gain for a microphone input terminal, a reference gain of a speaker stage, and a gain of an output stage, respectively, with a resistance value corresponding to the selected optimum gain adjustment value; Characterized in that comprises a.

In the echo canceller tuning method, the step of controlling and setting the gain of each stage with a resistance value corresponding to the gain adjustment value may include selecting a potentiometer corresponding to each gain adjustment item and selecting a resistance value of the potentiometer. It is characterized in that the gain is adjusted by setting the resistance value to the corresponding value by increasing / decreasing the input digital value.

In the echo canceller tuning method, the resistance value tuned to the input digital value is displayed on the GUI-based input unit as a previous tuning resistance value at the start of a new tuning operation.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings, the embodiment of the echo canceller optimum tuning method and apparatus thereof as follows.

First, Figure 3 shows an embodiment configuration of the echo canceller tuning device according to the present invention. 3, the echo canceller tuning device according to the present invention is connected to the microphones 20 and 40 and the speakers 30 and 50 based on the wired / wireless communication network 10 to form a two-way audio communication network. In order to prevent the acoustic echo phenomenon and the howling phenomenon, the echo canceller 80 has a structure provided with the echo canceller tuning unit 100.

The echo canceller tuning unit 100 and a GUI input unit 200 for inputting data for performing optimization tuning based on a GUI as a digital value. The GUI input unit 200 provides a user interface for inputting data for tuning as a digital value, and a potentiometer inside the echo canceller tuning unit 100 corresponding to the digital values of the microphone input terminal, the speaker reference terminal, and the output terminal, respectively. The gain adjustment resistance values Ri, Rr, and Ro are expressed together.

The echo canceller tuning unit 100 outputs a digital potentiometer control signal Ri, Rr, Ro for controlling the microphone input stage gain, speaker reference gain, and output stage gain according to the digital set value input from the GUI input unit 200. A central processing unit (CPU) 110 and an input potentiometer 120 for outputting an input gain control signal R_input according to the control signal Ri output from the central processing unit 110; A reference potentiometer 130 for outputting a speaker reference gain control signal R_reference according to the control signal Rr output from the central processing unit 110, and a control output from the central processing unit 110; Input from the microphone 20 by an output potentiometer 140 for outputting an output gain gain control signal R_output according to the signal Ro and a gain control signal R_input output from the input potentiometer 120. Tooth of the audio signal being A reference gain adjuster 160 that adjusts the speaker gain reference gain of the echo canceller 80 by an input gain adjuster 150 that adjusts the control signal and a gain control signal R_reference output from the reference potentiometer 130. And an output gain control unit 170 for adjusting the output stage gain by the gain control signal R_output output from the output potentiometer 140.

The gain control unit 150, 160, 170 is composed of an operational amplifier (OP AMP), a resistor and a capacitor (capacitor), it is possible to change the value of the capacitor, but the present invention is limited to the case of changing only the resistance value.

Referring to Fig. 3, the GUI-based echo canceller optimal tuning operation will be described.

The user sets a data value to be tuned through the GUI input unit 200. This is equivalent to inputting the resistance value (digital data value) of each of the potentiometers 120, 130, and 140 for adjusting the gain of the gain adjusting units 150, 160, 170 in the echo canceller tuning unit 100. The tuning value input by the user in the GUI is input to the CPU 110. The CPU 110 transmits the values of the GUI input units corresponding to the resistance values, that is, Ri, Rr, and R0, to the digital potentiometers 120, 130, and 140, respectively.

The input potentiometer 120 is enabled by the chip select signal CS and determines whether to increase or decrease its output value R_input by the up / down control signal U / P. According to the value of INC (Increment), the output value R_input is increased or decreased. Herein, the target value of the increase / decrease becomes a resistance value corresponding to the tuning value Ri set by the GUI input unit 200.

The reference potentiometer 130 is enabled by the chip select signal CS and determines whether to increase or decrease its output value R_reference by the up / down control signal U / P. According to the value of INC: Increment, the output value R_reference is increased or decreased. In this case, the target value of the increase / decrease becomes a resistance value corresponding to the tuning value Rr set by the GUI input unit 200.

The output potentiometer 140 is enabled by the chip select signal CS and determines whether to increase or decrease its output value R_output by the up / down control signal U / P. According to the value of INC: Increment, the output value R_output is increased or decreased. In this case, the target value of the increase / decrease becomes a resistance value corresponding to the tuning value Ro set by the GUI input unit 200.

The input gain adjusting unit 150 changes the gain by the adjusted resistance value R_input output from the input potentiometer 120, and the changed gain adjusts the gain of the audio signal input to the microphone 20. The reference gain control unit 160 has a gain changed by the adjusted resistance value R_reference output from the reference potentiometer 130, and the changed gain is supplied to the echo canceller 80 and reflected in the echo canceling operation. do. The output gain adjusting unit 170 changes the gain by the adjusted resistance value R_output output from the output potentiometer 140, and the changed gain adjusts the output gain.

The output of the tuned echo canceller 80, which is thus tuned, is transmitted to the other party through the communication network 10, and this process is repeated so that the developer can perform the best echo canceller-codec-performance in any environment. It is possible to obtain a tuning value, that is, a resistance value of the gain adjusters 150, 160, and 170.

4 is a flowchart illustrating an overall operation of an echo canceller according to the present invention. When power is supplied to the system, the normal operation is executed (S11). The developer selects the tuning GUI input unit 200 to adjust the gain of the echo canceller (S12). Based on this GUI, the part that needs gain adjustment is selected and the corresponding digital value is input.When the digital value is input, the output of the corresponding potentiometers 120, 130 and 140 is changed by the input value as described above. The gain is adjusted by each resistance value corresponding to the changed output, and through this process, the developer can select the optimal tuning value of the echo canceller (S13).

5 is a detailed flowchart of the step of performing the optimum tuning. As described above, when the GUI input unit is selected, previously set values, that is, resistance values corresponding to respective adjustment items are displayed on the GUI input unit 200 (S21).

Next step (S22) is to adjust the resistance value of the gain control unit. That is, the developer inputs new pulse values for tuning based on the displayed values, and then the outputs of the potentiometers 120, 130, and 140 change according to the control of the CPU 110 as much as the input digital values. As the output value of each potentiometer changes, the values input to the echo canceller 80 also change.

In this state, it is determined whether the echo canceller 80 is optimally tuned (S23). If the echo canceller is not in the optimum tuning state at this stage, the process is repeated from the previous adjustment step (S22). If the echo canceller is in the optimum tuning state, the process proceeds to the next step (S24) and the resistance value at that time. After the gain adjustment is completed, the gain adjustment is finished.

6 shows the gain adjustment step in more detail. As described above, Ri, Rr, and Ro values for tuning to digital values are input from the GUI input unit 200 (S31). Then, the CPU 110 selects the potentiometers 120, 130, and 140 corresponding to each item by using the chip select signal CS. Then, the increase or decrease (up / down) items of the corresponding potentiometer are set (S32). That is, it is determined whether to increase or decrease the output resistance value of the potentiometer in order to reach the target digital value.

In the next step S33, the INC of the digital potentiometers 120, 130 and 140 is driven to increase (or decrease) its output resistance value, and it is determined whether the resistance value is increased by the target value (input digital value). (S34).

If the output resistance values R_input, R_reference, and R_output of the potentiometer increase to the target value in step S34, the process proceeds to the next step S35 to set the resistance value to the currently adjusted value and complete the gain adjustment.

The echo canceller tuning system of the present invention provides a tuning method of a GUI development environment, so that the echo canceller tuned with optimal results can be realized even in a device operation environment in which a noise environment is very high. In addition, according to the present invention, even if the position of the microphone and the speaker are differently set for each system environment, or even if there is an extreme change in the ambient noise environment due to the movement, the basis for tuning the echo canceller to have the best performance is provided. Is provided.

In addition, the echo canceller optimization tuning system of the present invention can be applied not only to a mobile terminal based audio communication system such as telematics, but also to any system capable of tuning by adjusting gain.

Claims (7)

In a system capable of two-way audio communication based on the network, GUI input means for selecting and inputting a gain adjustment value for echo canceller tuning based on a GUI, and outputting an echo canceller tuning control signal corresponding to a digital value selected by the GUI input means as a digital value And tuning means for adjusting the output of the microphone and the speaker according to the tuning control signal output by the tuning control means so that the output of the tuned echo canceller is transmitted through the communication network. Ecowoo Canceller Tuning System. The echo canceller tuning device of claim 1, wherein the GUI input unit selects a gain control value for the microphone input terminal, a reference gain control value for the speaker stage, and a gain adjustment value for the output stage, respectively, as digital values. . The display apparatus of claim 1, wherein the GUI input unit selects a gain control value for a microphone input terminal, a reference gain control value for a speaker stage, and a gain adjustment value for an output stage, respectively, and displays a potential difference value corresponding to the corresponding value. Eco-cancell canceller tuning device characterized in that. In a system capable of two-way audio communication based on the network, A GUI input means for selecting a gain adjustment value for echo canceller tuning based on a GUI, and a microphone input end, a speaker end, and an output end of the echo canceller in response to the gain adjustment value input by the GUI input means, respectively. A processor for outputting a gain adjustment value of the processor, potentiometers for outputting a corresponding gain control signal in response to the gain control value of each stage output from the processor, and an input stage gain for adjusting the gain of the microphone input terminal in response to the output value of the potentiometer. Adjusting means, reference gain adjusting means for adjusting the reference gain of the speaker stage in correspondence with the output value of the potentiometer, output stage gain adjusting means for adjusting the gain of the output stage in response to the output value of the potentiometer, and the input stage gain adjusting means. The microphone signal controlled by the gain is input, and the reference gain adjusting means Standing reference gain is set to echo canceller right tuning device, characterized in that configured to include a right echo canceller for supplying a signal to remove the echo right to the output gain control means. In a system capable of two-way audio communication based on the network, Inputting a gain adjustment value for a microphone input end, a reference gain adjustment value for the speaker end, and a gain adjustment value for the output end from the GUI-based input unit for tuning, respectively; Selecting an optimum gain control value of an echo canceller by adjusting a digital value of a GUI input from the GUI input unit; Controlling and setting a gain for a microphone input terminal, a reference gain of a speaker stage, and a gain of an output stage, respectively, with a resistance value corresponding to the selected optimum gain adjustment value; Echo canceller tuning method characterized in that it comprises a. 6. The method of claim 5, wherein the step of controlling and setting the gain of each stage with a resistance value corresponding to the gain adjustment value comprises selecting a potentiometer corresponding to each gain adjustment item and setting the resistance value of the potentiometer to the input digital signal. Echo canceller tuning method characterized in that the gain adjustment by setting the resistance value to the corresponding value by increasing / decreasing the value. 6. The echo canceller tuning method of claim 5, wherein the resistance value tuned in response to the input digital value is displayed as the previous tuning resistance value at the time of starting a new tuning operation.

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