JP2001036625A - Method for adjusting amount of echo in speech unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a method for adjusting an amount of echo in a speech unit that no various devices are required to measure the amount of echo and the amount of echo of a device to be measured can be measured in a state of being close to an actual speech state. SOLUTION: A CPU 28 controls a sound source producing section 24 to produce a reference sound. A speaker 32 sounds this reference sound via a sound volume adjustment circuit 30 and a sound volume measurement section 26 processes the sound output as an input signal from a microphone 34 via a space, an enclosure and an internal circuit. The CPU 28 processes the processed data as a sound volume and outputs it to a personal computer 70. The personal computer 70 converts the received sound volume into the amount of echo on the basis of data having been sampled in advance and makes decision of acceptability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device, and more particularly to a method for adjusting an echo amount of a communication device in a production line.

[0002]

2. Description of the Related Art For example, in a communication device such as a telephone, if the amount of echo is not suppressed to an appropriate value, the communication quality deteriorates. Further, the amount of echo in the communication device differs depending on the characteristics of each component, even if the same component is used.
Therefore, the echo amount is measured on a production line or the like before shipment of the communication device, and the internal circuit of the communication device is adjusted based on the measured value.

FIG. 5 shows an example of a system configuration according to the prior art for measuring an echo amount in a production line. As shown in the figure, when measuring the echo amount of the device under test 86, which is a communication device, the measurement was performed using the sound source device 80, the sound volume measuring device 82, and the pseudo line device 84. More specifically, the sound source device 80 that outputs the audio signal is connected to the transmission section of the pseudo line device 84, and the volume measurement device 82 that measures the volume is connected to the reception section of the pseudo line device 84. Also, the device under test 86 and the pseudo line device 84 are connected by a telephone line with a modular plug, for example.

When measuring the echo amount, a pseudo line device 8 is used.
In step 4, a pseudo call is generated to the device under test 86, and the device under test 86 is placed in a talking state. After that, a predetermined audible sound is output by the sound source device 80, so that the pseudo line device 84
The audible sound is transmitted to the device under test 86 via the. The audible sound sent from the pseudo line device 84 is transmitted to the device under test 8.
6 and then output from the speaker 90.

The audible sound output from the speaker 90 becomes an echo, is collected by the microphone 92, and is input to the communication circuit 88 again. The audible sound input to the communication circuit 88 is input to the sound volume measuring device 82 via the pseudo line device 84, and the echo generated inside the communication circuit 88 by the measuring device 82 and the echo collected by the microphone 92 are output. Is measured. Based on the measurement result, the communication circuit 88 is adjusted so that the echo amount becomes an optimum value.

[0006]

However, in such a conventional technique, several measuring devices (a sound source device 80 and a sound volume measuring device 82) and a pseudo line device 84 are used to measure the echo amount in the device under test 86. Was needed.
Further, unless the measurement device and the pseudo line device 84 are sufficiently adjusted, a correlation with data measured by another measurement system cannot be obtained. Further, since echo and noise are also generated in the pseudo line device 84, the measurement result in the sound volume measuring device 82 is affected by the pseudo line device 84, and the accurate echo amount of the device under test 86 cannot be measured. There were also problems.

On the other hand, for example, Japanese Patent Application Laid-Open No. 5-130206 discloses a conventional key telephone apparatus capable of appropriately adjusting the amount of echo attenuation. Since this key telephone device can accommodate two or more office lines and has a transfer function, it is possible to simulate a call using the two office lines. In addition, since the key telephone device has a test signal generator for generating a test signal for measuring the echo amount and an echo measuring circuit inside the device, it is necessary to measure the echo amount of the internal circuit while in a call state. Can be.

As described above, since the prior art does not require a pseudo line device or a special measuring device, there is an advantage that there is no influence on the pseudo line device. However, in this conventional technique, only the echo amount in the internal circuit is measured, and for example, an echo output from the speaker 90 and collected by the microphone 92 as shown in FIG. 5 cannot be added. Therefore, the internal circuit cannot be adjusted so that the echo amount including the external echo amount becomes an appropriate value, and there is a problem that an optimum call quality cannot be obtained during an actual call. .

The present invention solves such problems of the prior art, and does not require various devices for measuring the echo amount.
It is another object of the present invention to provide a method for adjusting an echo amount in a communication device which enables measurement of an echo amount of only the device under measurement in a state close to an actual communication state.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method for adjusting an echo amount in a communication device provided with a digital signal processing section including a signal sound utterance circuit. Set the path to speaker output and microphone input. Then, a signal sound of a predetermined frequency is output from the signal sound utterance circuit of the digital signal processing unit under external control. The signal sound output from the signal sound generation circuit is output from the speaker and input to the microphone, and the energy amount of the signal generated in the microphone and the circuit of the communication device is calculated by the digital signal processing unit, and the data is processed as a volume. And output to the outside. The volume output to the outside is determined by being converted into an echo amount based on data prepared in advance. The echo amount of the communication device is adjusted based on the result determined outside.

Further, according to the present invention, the echo amount adjusting method in the communication device provided with the digital signal processing unit including the signal sound utterance circuit sets the voice path in the communication device to the speaker output and the microphone input. Then, by a predetermined operation, a signal sound of a predetermined frequency is output from the signal sound utterance circuit of the digital signal processing unit. The signal sound output from the signal sound utterance circuit is output from the speaker and input to the microphone, and the digital signal processing unit calculates the amount of energy of the signal generated in the microphone and the circuit of the communication device.
Then, the data calculated by the digital signal processing unit is processed as a sound volume, the echo amount is converted based on data prepared in advance, and the echo amount of the communication device is adjusted according to the converted echo amount.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a method for adjusting an echo amount in a communication apparatus according to the present invention.

Referring to FIG. 1, there is shown a functional block diagram showing an embodiment of an echo amount adjusting method in a communication device according to the present invention. The communication device 20 shown in FIG.
For example, it is a communication device such as a telephone, and is connected to the personal computer 70 via the connector 36 when the echo amount is adjusted on the production line.

The communication device 20 includes a communication circuit 22, a sound source generation unit 24, a volume measurement unit 26, a CPU 28, an echo canceller circuit 30, a volume adjustment circuit 31, a speaker 32, and a microphone 34. FIG. 1 illustrates functional blocks of a characteristic portion of the present invention, and components not directly related to the present invention are omitted.

The communication circuit 22 is a circuit for forming a communication path, and has a sound source generator 24 and a volume measuring unit 26 connected thereto. The sound source generation unit 24 and the volume measurement unit 26 are signal processing circuits, and the CPU 28 performs these controls and call processing. The sound source generator 24 is a circuit that outputs a predetermined signal to the speaker 32 under the control of the CPU 28. The signal output from the sound source generator 24 is a signal corresponding to the characteristics of the communication device 20 as the device under test. If the device under test is a telephone, for example, a tone signal, a pseudo voice, white noise, etc. It is the signal that was. This type of reference sound is output from a speaker 32 via an echo canceller circuit 30 and a volume adjustment circuit 31 for adjusting the volume.

The reference sound output from the speaker 32 is input as an echo by the microphone 34 via a space, a housing, and an internal circuit. The input signal is transmitted to the sound volume measuring unit 26 via the echo canceller circuit 30.
Is input and processed. Specifically, the amount of energy of the echo generated in the microphone 34 and the circuit is calculated by the sound volume measuring unit 26, and the calculation result data is
8 is output. The CPU 28 processes the data of this calculation result as a volume and outputs it to the personal computer 70.

The personal computer 70 makes a pass / fail judgment by converting the input sound volume based on data created by sampling in advance. In the production line, the adjustment of the echo amount in the communication device 20 is completed by adjusting the echo canceller circuit 30 based on the pass / fail judgment. It goes without saying that the adjustment can be made not only by the echo canceller circuit 30 but also by the volume adjustment circuit 31.

FIG. 2 is a functional block diagram showing an embodiment in which the communication device according to the present invention is applied to a portable telephone. The mobile phone 40 of the present embodiment can be connected via a connector 62 to a personal computer 70 that determines whether or not the echo amount is acceptable.

In the portable telephone 40, a communication circuit 42 is connected to an antenna, and enables transmission and reception of a voice signal with a base station (not shown) via the antenna. The communication circuit 42 is also connected to the digital signal processing unit 43. The digital signal processing unit 43 includes a channel decoder 44 and a speech decoder 46 as a receiving system, and a channel encoder 48 and a speech encoder 50 as a transmitting system.

The speech decoder 46 is a circuit capable of generating various sounds corresponding to sound source data, for example, tone signals of 500 Hz, 1 kHz, 2 kHz, white noise, pink noise, and human voice. Further, the speech encoder 50 has a function of calculating the energy amount of the input signal. This is because the speech decoder 46 can generate various sounds in accordance with the sound source data, so that the digital signal processing unit 43 can calculate the energy amount of the output sound and reduce the echo amount (the energy of the speech decoder). Amount) − (energy amount of the speech encoder). Therefore, the time required for the designer to perform verification can be reduced.

The digital signal processor 43 is connected to the echo canceller circuit 52 and the CPU 60. The echo canceller circuit 52 is a circuit that adjusts the echo amount of the mobile phone 40 according to factors such as the echo amount. In addition,
Instead of adjusting only with the echo canceller circuit 52,
It goes without saying that the volume can be adjusted including the volume adjustment circuit 53. The echo canceller circuit 52 outputs a sound A / D D / D via a sound volume adjustment circuit 53 for adjusting the sound volume.
It is connected to the A converter 54. The audio A / DD / A converter 54 converts a digital signal input from the audio adjustment circuit into an analog (audio) signal and outputs it to the speaker 56, or converts an analog (audio) signal input from the microphone 58 into a digital signal. It is a codec chip that converts and outputs the result to the echo canceller circuit 52 via the volume control circuit 53.

The CPU 60 is a control circuit for controlling the entire portable telephone 40. The CPU 60 also generates the sound source data 6
4 is provided to the speech decoder 46, and a function of outputting a desired sound from the speech decoder 46 is provided. CP
The U60 can output a tone signal of, for example, 500 Hz, 1 kHz, and 2 kHz, white noise, pink noise, and human voice from the speech decoder 46. In the embodiment shown here, a desired sound to be tested is generated and output by the speech decoder 46.
An MF generation circuit may be provided to generate a predetermined tone signal.

The CPU 60 also controls the speech encoder 5
When an energy amount of the echo amount is input from 0, it is processed as a sound volume and output to the personal computer 70 connected to the connector 62. Further, upon receiving the pass / fail determination of the echo amount from the personal computer 70, the CPU 60 adjusts the echo canceller circuit 52 based on the result.

FIG. 3 is a process flow showing the operation of the echo amount adjusting method in the portable telephone 40 shown in FIG.
The operation of the present embodiment will be described below with reference to FIGS.

When adjusting the echo amount of the mobile phone 40 on the production line, first, the audio path in the audio A / D D / A converter 54 is set to the speaker output and the microphone input, and the volume on the path is set. To an appropriate value (S10
0). Next, when a control signal for activating the digital signal processing unit 43 is output from the personal computer 70 connected to the mobile phone 40 (S102), the CPU 6
0 outputs the sound source data 60 to the speech decoder 46. Thereby, the speech decoder 46 is, for example, 1k
A tone signal of Hz is transmitted (S104).

The 1 kHz tone signal is output to the outside from a speaker 56 via a volume control circuit 52 and an A / D D / A converter 54, and a microphone 58 and an echo generated in the circuit are sent to a speech encoder 50. Is entered.
The speech encoder 50 calculates the energy amount of the input echo and outputs the result to the CPU 60 (S10).
6).

The CPU 60 processes the input energy amount as volume data and outputs it to the personal computer 70 (S106). The personal computer 70 converts the sound volume data as an echo amount based on data sampled by the designer in advance, and makes a pass / fail judgment (S
110). When the adjustment is performed based on the result of the pass / fail determination in the personal computer 70, the CPU 60 adjusts the echo canceller circuit 52 (S112). It goes without saying that the adjustment can be performed not only by the echo canceller circuit 52 but also by the volume adjustment circuit 53.

Although the embodiment of the echo amount adjusting method in the communication device according to the present invention has been described in detail, the present invention is not particularly limited to this. That is, in the production line, the echo amount is measured using the personal computer 70 for convenience, but the control may be performed by an internal program of the communication device. In this case, the control is started by a specific key input, and May be displayed on an LCD or the like.

FIG. 4 shows a flow of processing in the case where the control is performed by the internal program of the portable telephone 40 shown in FIG. 3 and the echo amount is calculated. In the following description, the components of FIG. 3 will be described for convenience, but in this case, the personal computer 70 is not connected. Also when the control is performed by the internal program, the audio path is set to the speaker output and the microphone input (S400). Then, a key input operation for performing a measurement test of the echo amount is performed, and a predetermined tone signal is output from the digital signal processing unit 43 (S402).

The tone signal is output from the speaker 56, and the echo generated in the microphone 58 and the circuit is input to the speech encoder 50. The speech encoder 50 calculates the energy amount of the input echo (S404),
The result is output to the CPU 60. The CPU 60 converts the input energy amount into an echo amount based on data sampled by the designer in advance, and performs pass / fail determination (S406). Then, the determined echo amount is displayed on the display unit of the communication device, and the echo canceller circuit is adjusted based on the content (S408). It goes without saying that the adjustment can be performed not only by the echo canceller circuit 52 but also by the volume adjustment circuit 53.

[0031]

As described above, according to the method of adjusting the echo amount in the communication device of the present invention, the sound is output from the speaker and collected by the microphone without the need for a sound source generator, a sound volume measurement device, and a pseudo communication device. This makes it possible to measure the amount of echo including the reflected echo. This eliminates the need for complicated settings and the like in adjusting the amount of echo, and also makes it possible to measure the amount of echo close to the actual use state, and based on this, adjusts the internal circuit to improve high-quality speech quality. Obtainable.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of an echo amount adjusting method in a communication device according to the present invention.

FIG. 2 is a functional block diagram showing an embodiment when the echo amount adjusting method in the communication device according to the present invention is applied to a mobile phone.

FIG. 3 is a flowchart showing a flow of processing of an echo amount adjusting method in the mobile phone shown in FIG. 2;

FIG. 4 is a flowchart showing a processing flow of an echo amount adjusting method when the echo amount is determined by an internal program.

FIG. 5 is a system configuration diagram showing an echo measurement system in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Communication apparatus 22, 42 Communication circuit 24 Sound source generation part 26 Volume measurement part 28, 60 CPU 30, 52 Echo canceller circuit 32, 56 Speaker 34, 58 Microphone 36, 62 Connector 40 Cellular phone 44 Channel decoder 46 Speech decoder 48 Channel encoder Reference Signs List 50 speech encoder 54 audio A / D D / A converter 62 volume data 64 sound source data 70 personal computer

Claims (5)

[Claims] 1. A method for adjusting an echo amount in a communication device having a digital signal processing unit including a signal sound utterance circuit, wherein a voice path in the communication device is set to a speaker output and a microphone input, and the digital signal is controlled by an external device. A signal sound of a predetermined frequency is output from the signal sound utterance circuit of the signal processing unit, and the signal sound output from the signal sound utterance circuit is output from the speaker and input to the microphone. The energy amount of the signal generated in the circuit is calculated by the digital signal processing unit, the data calculated by the digital signal processing unit is processed as a sound volume and output to the outside, and the sound volume output to the outside is prepared in advance. It is converted into an echo amount on the basis of the data that has been determined, and the call device is determined based on the result of the external determination. Echo amount adjustment method in the call device of echo, characterized in that it is adjusted. 2. A method for adjusting an echo amount in a communication device provided with a digital signal processing unit including a signal sound uttering circuit, wherein a voice path in the communication device is set to a speaker output and a microphone input, and a predetermined operation is performed on the digital signal. A signal sound of a predetermined frequency is output from a signal sound utterance circuit of the processing unit, and the signal sound output from the signal sound utterance circuit is output from the speaker and input to the microphone, and the microphone and the circuit of the communication device Calculating the energy amount of the signal generated in the digital signal processing unit, processing the data calculated by the digital signal processing unit as a volume, converting the echo amount based on data prepared in advance, Adjusting the echo amount of the communication device according to the echo amount obtained. Adjustment method. 3. The communication apparatus according to claim 1, wherein the digital signal processing unit generates a DTMF signal that is a combination of multiple frequencies in a voice frequency band.
An echo amount adjusting method in a communication device, comprising an F generation circuit, wherein the signal sound of the predetermined frequency is output from the DTMF generation circuit. 4. The communication device according to claim 1, wherein the digital signal processing unit includes a speech decoder for converting data into an audio signal, a signal of various frequencies, white noise, pink noise, and a pseudo audio signal. Is output from the speech decoder as a signal sound of the predetermined frequency. 5. The communication device according to claim 2, wherein the digital signal processing unit includes a speech decoder that converts data into an audio signal and a speech encoder that converts an audio signal into data. A method for adjusting an echo amount in a communication device, which is calculated as (energy amount of a speech decoder)-(energy amount of a speech encoder).