Loudspeaker abnormal sound detection method and system

A detection method and speaker technology, applied in electrical components and other directions, can solve the problems of difficulty in consistency and inability to express the comfort level of sound signals, and achieve the effect of improving accuracy and reducing false positive rate.

Active Publication Date: 2015-12-16
NANJING NORMAL UNIVERSITY
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Problems solved by technology

However, this simplified auditory perception model is actually obtained based on the loudness of the sound, and the test results obtained by the model only reflect the strength of the sound signal, and cannot represent the comfort level of the sound signal
Therefore, it is difficult for this method to be consistent with the hearing judgment results of the human ear.

Method used

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  • Loudspeaker abnormal sound detection method and system
  • Loudspeaker abnormal sound detection method and system
  • Loudspeaker abnormal sound detection method and system

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] Both the excitation signal and the response signal in the present invention are digital signals.

[0048] according to figure 1 Build a test system, the loudspeaker abnormal sound detection system includes: PC: used to generate excitation signals and transmit them to the digital acquisition card; receive response signals and calculate the high-order sharpness distortion value at each frequency point through the high-order sharpness distortion module, Then obtain the abnormal sound curve of the speaker, and give the judgment result of the speaker under test according to the abnormal sound curve of the speaker;

[0049] Data acquisition card: The D / A module in the data acquisition card converts the excitation signal into an analog excitation signal and transmits it to the power amplifier; the A / D module in the data acquisition card converts the am...

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Abstract

The invention discloses a loudspeaker abnormal sound detection method and system and mainly aims at solving the problem that a result obtained by use of a traditional loudspeaker abnormal sound detection method is inconsistent with the judgment result of the subjective sensation of human eyes. The invention relates to a loudspeaker abnormal sound detection method and system based on a psychoacoustic sharpness parameter; according to the method and the system, the abnormal sound of the loudspeaker is detected by calculating the high-order sharpness distortion of the loudspeaker. The loudspeaker abnormal sound judgment result obtained by use of a high-order sharpness distortion algorithm in the detection method is more consistent with the subjective sensation of the human eyes, and therefore, the misjudgment ratio can be reduced and the correctness of the judgment result can be improved.

Description

technical field [0001] In the research and development stage of the speaker, improper design of the structure of the sounding body or improper selection of materials will cause abnormal sound when the speaker vibrates and produces sound; in the mass production stage of the speaker, there are more unpredictable situations, such as: the center glue part is degummed , deformation of the voice coil or scattered wires, aging of the elastic wave and loss of elasticity, and deformation of the basin frame will cause abnormal sounds from the speaker. Especially in the process of mass production, it is difficult to completely avoid this situation. Loudspeakers with abnormal sound can produce unacceptably harsh sound when stimulating normal sound, therefore, these speakers cannot be delivered to customers and need to be detected during the production process. Traditional objective parameter detection includes frequency response and total harmonic distortion (THD). The results obtained b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
Inventor 周挺挺张铭李晨
Owner NANJING NORMAL UNIVERSITY
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