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Active noise control system for fan of portable computer

A portable computer and fan noise technology, which is applied in the field of network communication, can solve the problems of reducing the noise of the computer cooling fan, etc., and achieve the effects of low cost, noise elimination, and convenience.

Active Publication Date: 2013-08-14
HUBEI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to use the built-in monophonic microphone and stereo speakers of the portable computer, as well as the central processing unit of the computer itself, to weaken the noise of the cooling fan of the computer within a specific space range.

Method used

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  • Active noise control system for fan of portable computer
  • Active noise control system for fan of portable computer
  • Active noise control system for fan of portable computer

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Embodiment Construction

[0029] In conjunction with the accompanying drawings, the specific description of the embodiments of the present invention is provided as follows.

[0030] An embodiment of the present invention provides an active noise control system for reducing the noise of a cooling fan of a portable computer in a specific space range. According to the residual noise signal collected by the built-in monophonic microphone of the computer, the central processing unit of the computer is used to generate a cancellation signal in real time. driving the built-in stereo speakers of the computer to destructively interfere with the noise of the cooling fan of the computer in a specific space range, so as to achieve the purpose of weakening the noise of the cooling fan of the computer in a specific space position.

[0031] An active fan noise control system based on a portable computer's built-in microphone and speaker, such as figure 2 shown, including:

[0032] (1) The residual noise collection ...

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Abstract

The invention discloses an active noise control system for a fan of a portable computer. The active noise control system comprises a residual noise acquisition unit, a de-noising feedback control unit and a noise offset unit; the residual noise acquisition unit is used for acquiring sound signals of a specific spatial position, and comprises a built-in single-track microphone of the portable computer and an analog / digital converter of a built-in sound card of the computer; the de-noising feedback control unit is used for generating offset signals to drive the noise offset unit according to signals outputted by the residual noise signal acquisition unit, and comprises a central processing unit of the computer; and the noise offset unit is used for outputting offset sound waves, the offset sound waves and noise sound waves of the radiating fan of the computer are subjected to offset interference in a certain spatial range, the noise offset unit comprises a digital / analog converter of the built-in sound card of the computer and built-in stereo speakers of the computer, and the stereo speakers include a left-track speaker and a right-track speaker.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to an active noise control system for eliminating fan noise of a portable computer. Background technique [0002] like figure 1 As shown, portable computers generally use fans to dissipate heat, and the operating distance does not exceed 1m. Therefore, fan noise often interferes with computer use, such as music playback and voice calls, and causes noise pollution to users. Fan noise consists of three main components: blade thickness noise (periodic single-harmonic noise with the same frequency as the fan speed); steady-state aerodynamic noise (periodic multi-harmonic noise with a frequency that is an integer multiple of the fan speed); Steady-state aerodynamic random noise (aperiodic broadband noise). On the other hand, the fan speed generally increases as the computer load increases, while the fan noise is controlled by the speed. Therefore, from the point of view ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/66
Inventor 吴钊
Owner HUBEI UNIV OF ARTS & SCI
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