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Active Noise Canceling Headphones

An active noise reduction and earphone technology, which is applied in earpiece/earphone accessories, earphones to reduce environmental noise, sensors, etc., can solve high-frequency howling and other problems

Active Publication Date: 2021-04-23
GEER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design of the filter is constrained by both phase and amplitude. Feedback noise reduction is likely to cause high-frequency howling, which affects the use.

Method used

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  • Active Noise Canceling Headphones
  • Active Noise Canceling Headphones
  • Active Noise Canceling Headphones

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Embodiment Construction

[0025] The embodiment of the present invention discloses an active noise reduction earphone to avoid high-frequency howling of the feedback noise reduction earphone in a physical way.

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] see Figure 1-Figure 2 , figure 1 It is a schematic cross-sectional structure diagram of an active noise reduction earphone according to a specific embodiment of the present invention; figure 2 for figure 1 Schematic diagram of A-A cross-section in middle.

[0028] ...

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Abstract

The invention discloses an active noise reduction earphone, which comprises a casing, the front end of the casing has a sound hole, and a feedback microphone for picking up ambient sound, a low-frequency speaker unit, a mid-high frequency speaker unit and a noise reduction circuit are arranged in the casing. The microphone is only electrically connected to the low frequency speaker unit through the noise reduction circuit. Applying the active noise reduction earphone provided by the present invention, the feedback microphone collects the environmental noise inside the earphone and outputs a signal with the same amplitude and opposite phase as the environmental noise to the low-frequency speaker unit through the processing of the noise reduction circuit. Low, high-frequency cut-off frequency is low, so the high-frequency anti-phase sound waves emitted by the low-frequency speaker unit are attenuated, and the high-frequency amplitude is physically reduced while achieving noise reduction. There is no need to adjust the filter to reduce the high-frequency amplitude, and the high-frequency howling is avoided in a physical way.

Description

technical field [0001] The invention relates to the technical field of earphones, and more specifically, relates to an active noise reduction earphone. Background technique [0002] In recent years, active noise-canceling headphones have been highly praised to meet people's needs for listening to music quietly. The noise reduction methods of active noise reduction headphones can usually be divided into analog noise reduction and digital noise reduction. Through the design of the filter, a signal with equal amplitude and opposite phase to the external noise is generated to achieve the noise reduction effect. Common types of noise reduction include feed-forward noise reduction, feedback noise reduction and hybrid noise reduction, which are widely used in headsets, earbuds, and in-ear headphones. However, the design of the filter is restrained by the phase and the amplitude, and it is easy to cause high-frequency howling in the feedback noise reduction, which affects the use. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R1/10
CPCH04R1/1083H04R2201/10
Inventor 铁广朋郭在康
Owner GEER TECH CO LTD
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