Time frequency analysis based loudspeaker noise online detecting instrument

A time-frequency analysis and loudspeaker technology, applied in electrical components and other directions, can solve the problem of not finding research reports on instruments and devices, and achieve the effect of overcoming subjectivity and ambiguity of description, simple overall structure, and improved loudspeaker quality.

Inactive Publication Date: 2008-01-30
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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Problems solved by technology

[0004] Through various literature searches at home and abroad, no si

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  • Time frequency analysis based loudspeaker noise online detecting instrument
  • Time frequency analysis based loudspeaker noise online detecting instrument

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Embodiment Construction

[0024] The composition of the present invention will be described in detail through specific embodiments below in conjunction with the accompanying drawings, but the description of the embodiments of the present invention is illustrative rather than restrictive, and the scope of protection is subject to the content of the claims.

[0025] System of the present invention (see Fig. 1) is made of signal generator, loudspeaker, microphone, muffler box and acquisition card, and signal generator is connected loudspeaker by wire, and the signal generator that adopts can be frequency sweeper and similar signal generator . The data acquisition card collects the audio and electrical signals transmitted by the microphone. The data acquisition card can be installed in the slots of various microprocessors, and the microprocessor performs sampling, storage, analysis and processing and displays them on the display screen. The structure of the anechoic box of the present invention is with ref...

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Abstract

The invention relates to a different sound on line detector for speaker based on time-frequency analysis. The invention is mainly characterized in that a signal generator is connected with a speaker through the wires, wherein the speaker is arranged in the heat transmission hole at the top of a noise elimination box, the bottom of the noise elimination box is provided with a microphone, the microphone is corresponding to the speaker, the microphone is connected with the input end of a collection card through wires, and is passed through A/D conversion, wave filter, time-frequency conversion, fault classification and identification, then outputs the identification results. The invention has a simple whole structure, the installation and manufacturing costs are lower, by adopting the method of time-frequency analysis, the speaker realizes rapidly and automatically intelligently detection in the production line, and the detection is precise, the detection efficiency is higher, the invention effectively overcomes the subjective and described fault identification by detector according to the experiences, and effectively ensures the healthy of the detectors; In addition, the invention is equally applicable to all the tuning of musical instruments, audio detection of pitch, so as to guarantee precise and reliability of the tuning and pitch of the musical instruments.

Description

technical field [0001] The invention belongs to the field of instruments and meters, in particular to an online abnormal sound detector for loudspeakers based on time-frequency analysis. Background technique [0002] At present, the key procedure for speaker manufacturers at home and abroad to detect speaker assembly quality is to conduct online inspection of speakers. The defects of speaker assembly quality detected include: small wires in the cover, bottoming, wire punching, bumping rings, garbage sounds, Metal garbage, non-metal garbage, mechanical sound, double sound, sand, cover air leakage, double paper pieces, water sound, poor bonding of crimping, etc. The traditional detection method is: use the continuous scanning signal to stimulate the speaker, and use the human ear to identify and judge, so as to identify the processing quality and assembly quality of the speaker. This work must be completed by trained inspectors. Due to the differences in the experience, level...

Claims

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Application Information

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IPC IPC(8): H04R29/00
Inventor 许增朴卢学军
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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