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Loudspeaker simple tone detecting method

A detection method and speaker technology, applied in electrical components and other directions, can solve the problems of inaccurate pure tone fault location and detection results, inability to fully satisfy pure tone detection, and inconvenient and practical operation, achieving high accuracy, easy implementation, and low cost. low cost effect

Active Publication Date: 2006-09-27
TSINGHUA UNIV +1
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Problems solved by technology

At present, only a set of speaker test system RT-Speaker developed by NTI company in Liechtenstein can realize automatic pure tone detection in the world, but because the detection algorithm is mainly based on the time domain differential method, the positioning and detection of pure tone faults The result is not accurate enough, the operation is not convenient and practical enough, and it cannot fully meet the needs of pure tone detection, and the cost is high and expensive

Method used

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  • Loudspeaker simple tone detecting method
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  • Loudspeaker simple tone detecting method

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Embodiment Construction

[0051] Figure 1-22 Be the preferred embodiment of the loudspeaker pure tone detection method based on wavelet transform of the present invention, below in conjunction with accompanying drawing the present invention is further described as follows:

[0052] The loudspeaker pure tone detection method based on wavelet transform proposed by the present invention comprises the following steps:

[0053] (1) Output the sine sweep signal through the sound card to the speaker to be tested placed in the test box, and the sound signal from the speaker is collected by the microphone and input to the echo card.

[0054] (2) Carry out signal head recognition on the time-domain waveform of the collected sound signal, determine the starting position of the effective signal, and intercept the signal with a set length from the starting position.

[0055] (3) Perform discrete wavelet decomposition on the intercepted signal, set the set approximation coefficients to zero, and perform wavelet re...

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Abstract

The invention relates to a loudspeaker sound detecting method, which comprises: the computer of sound card collects the time wave; the computer distinguishes the signal head of said wave to judge the initial position of one section of effective signal; computer processes Daub4 wavelet discompose on attained signal and reset preset parameter to 0 to process the wavelet rebuilding, to attain the rebuilding signal; the computer transforms the display method of attained result, to build the special sound curve; and the computer compares the special sound curve with the preset threshold curve, when there is one point of special sound curve is higher than the threshold of said point, the sound is detected as disqualified. The invention has high reliability, wider application and it can be used on online test.

Description

technical field [0001] The invention belongs to the field of loudspeaker quality detection and relates to pure tone detection technology therein. Background technique [0002] Pure tone detection is an important and basic link in the process of speaker detection. At present, the pure tone detection methods of speakers of major manufacturers at home and abroad still mainly rely on the human ear inspection of the operator, which is highly subjective, inconsistent in standards, and harmful to the hearing of the workers. Physical and mental health. At present, only a set of speaker test system RT-Speaker developed by NTI company in Liechtenstein can realize automatic pure tone detection in the world, but because the detection algorithm is mainly based on the time domain differential method, the positioning and detection of pure tone faults The result is not accurate enough, the operation is not convenient and practical enough, and it cannot fully meet the needs of pure tone det...

Claims

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Application Information

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IPC IPC(8): H04R29/00
Inventor 吉吟东孙新亚张桐李嘉扬周海昌张郑杨寿平杨军熊日威
Owner TSINGHUA UNIV
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