Shenzhen Abtec Electronics Co.,LTD(ABTEC) Shenzhen Abtec Electronics Co.,LTD(ABTEC)

Shenzhen Abtec Electronics Co.,LTD(ABTEC)

Acoustic test system of intelligent terminal

The main control board usually supports multiple working modes such as WIFI, Bluetooth, etc., and analyzes the MIC's voice instructions; the power amplifier board realizes the intelligent speaker voice playback; the MIC board realizes voice instruction recording, usually 6 ~ 8 microphones are recorded simultaneously; other auxiliary function boards such as buttons , LED and so on.
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Product serial number
ABT9802
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I. Smart audio is mainly divided into main control board, power amplifier board, MIC board and other auxiliary function boards

1. The main control board usually supports multiple working modes such as WIFI, Bluetooth, etc., and analyzes MIC's voice instructions.

2. Amplifier board realizes smart speaker voice playback

3.MIC board for voice instruction recording, usually 6 ~ 8 microphones recording at the same time

4. Other auxiliary function boards such as buttons, LEDs, etc.

 

Finished product test item:

Serial number

Test project name

Upper and lower limit

unit

Lower limit

General value

None

1

MIC sensitivity

 

 

 

 

2

MIC signal to noise ratio

 

 

 

 

3

MIC distortion

 

 

 

 

4

MIC frequency response

 

 

 

 

5

Leak test

 

 

 

 

 

Third, the finished product test project

Serial number

Test project name

Upper and lower limit

unit

Lower limit

General value

None

1

MIC Frequency response

 

 

 

 

2

MIC sensitivity

 

 

 

 

3

MIC Distortion

 

 

 

 

4

SPK Frequency response

 

 

 

 

5

SPK distortion

 

 

 

 

 

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System structure:

The system structure is mainly divided into embedded system, communication module, analog I / O module, power supply and auxiliary circuit.

Physical structure:

Principle of MIC board test:

Mic board test includes recording test and leakage test

Recording test is to output all kinds of standard test audio to artificial nozzle 1 from A2 audio analyzer, output I2S digital signal from mic board ADC to I2S digital input port of A2 audio analyzer for analysis, and finally obtain distortion, frequency response and other parameter results.

The leakage test is to output all kinds of standard test audio from A2 audio analyzer to artificial nozzle 1, output I2S digital signal from mic board ADC to I2S digital input port of A2 audio analyzer for analysis, and finally obtain the frequency response curve, which is compared with the frequency response curve obtained from recording test, and it is qualified if it is greater than 50dB.

Principle of finished product test:

Finished product test includes mic test and SPK test

Mic test is to record the signal received by mic as an audio file, and obtain the test results by analyzing the audio file, specifically: output various standard test audio from A2 audio analyzer to artificial mouth, at the same time, the intelligent speaker starts recording and converts it into WAV file for saving, play the automatic software after the end of beam to read the wav file saved by the intelligent speaker and submit it to the upper level of the audio analyzer. Finally, the sensitivity, distortion, frequency response and other parameters are obtained.

Speaker test uses Bluetooth to play the audio through the Bluetooth port of the product, which is collected by the mark mic and then sent back to the A2 audio analyzer for analysis. The specific process is: after the pairing and connection are successful, the A2 audio analyzer plays the mark test audio through the Bluetooth port to play the intelligent sound. At the same time, the standard MIC is used to receive the sound signal of the intelligent speaker and the A2 audio analyzer Analog port input, finally upload to the upper computer software for analysis, and then get the specker thd + N, frequency response curve, etc.

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