Feed back type active noise eliminating earpiece

A feedback and active technology, applied in the fields of electronics, communication, and instrumentation, can solve the problems of high price and unsatisfactory noise cancellation effect of noise-cancelling headphones, and achieve system stability, high cost performance, and noise-cancelling effects.

Inactive Publication Date: 2009-08-19
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The noise canceling effect of commercially available noise canceling headphones is not ideal, the average noise canceling is generally around 10db and the price is expensive

Method used

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  • Feed back type active noise eliminating earpiece
  • Feed back type active noise eliminating earpiece
  • Feed back type active noise eliminating earpiece

Examples

Experimental program
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Effect test

Embodiment Construction

[0039] The headphone of the present invention is made of polymer material with good sound insulation effect, which can cut off most of the high frequency noise above 500 Hz, and the low frequency noise below 500 Hz is eliminated by a closed-loop noise elimination circuit.

[0040] In the initial experiment, increasing the magnification of the circuit can indeed reduce the noise in the earmuffs and improve the signal-to-noise ratio, but it also causes low-frequency or high-frequency oscillations, which makes the circuit unstable. Oscillation occurs at the frequency where the denominator is zero (satisfying the phase and amplitude conditions at the same time), so the low-pass filter and phase shifter must be carefully designed to make the system achieve the best balance between stability and noise reduction.

[0041]Closed-loop noise cancellation uses a large amplification factor to reduce noise, and uses sealed earmuffs to attenuate high-frequency noise. The heat accumulated in the...

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Abstract

The invention relates to a feedback type active noise canceling earphone which is mainly composed of a microphone, a phase-shifting filter, an amplifier and a speaker, wherein the noise received by the microphone and the music are subtracted from the music signal output by the audio amplifier to obtain pure noise , the pure noise is superimposed with the music signal, and the high and low frequencies are filtered out through the phase-shift filter, and then amplified and inverted by the audio amplifier to drive the speaker, thereby canceling the external noise. The invention adopts the principle of feedback active closed-loop denoising to design filtering, phase shifting, amplification and compensation circuits, and improves the physical structure of the earphone, the arrangement of the feedback loop, the selection of components and earphone materials, so that the performance of the earphone is more stable , the noise cancellation effect is better, the average noise attenuation of the earphone is 20db in the range of 100-400HZ, and the maximum noise attenuation is 35db.

Description

Technical field [0001] The invention relates to electronics and communication, instrumentation technology, in particular to a feedback type active noise cancellation headset. Background technique [0002] The noise cancellation effect of commercially available noise cancellation headphones is not satisfactory. The average noise cancellation is generally around 10db and expensive. In the European and American markets, the price of a brand-name noise canceling headset is more than 150 US dollars. For example, the Bose brand noise canceling headset is priced at 300 US dollars or 3,600 yuan. Summary of the invention [0003] The purpose of the present invention is to provide a feedback type active noise canceling earphone based on the defects of the prior art, which adopts the feedback type active closed-loop noise canceling principle to design filtering, phase shifting, amplification and compensation circuits. In the physical structure of the earphone, the feedback loop The arrange...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 余成
Owner DONGGUAN UNIV OF TECH
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