Filter circuit for noise reduction headset

Abstract

A filter circuit for a noise reduction headset is characterized in that, a noise reduction microphone circuit is connected on one end of the filter circuit of the noise reduction headset; a first current node is arranged on a circuit in which one end of the noise reduction microphone circuit is connected with one end of a resistor R0; the other end of the noise reduction microphone circuit is grounded; the other end of the resistor R0 is connected to a high level; a lead-out line of the first current node is connected to an input end of a high-pass circuit; an output end of the high-pass circuit is connected with an input end of a gain amplifying circuit; an output end of the gain amplifying circuit is connected with an input end of a trap circuit; an output end of the trap circuit is connected with an input end of a gain feedback amplifying circuit through a resistor R7; an output end of the gain feedback amplifying circuit is connected with a positive pole of a loudspeaker circuit; the loudspeaker circuit is grounded; and in this way, on the basis of combination with a headset noise reduction chip, a wide noise reduction frequency range is achieved, the overall headphone noise reduction effect is improved, and high quality experience is brought to users.

Description

technical field [0001] The invention belongs to the technical field of earphone equipment, and in particular relates to a filter circuit of a noise reduction earphone. Background technique [0002] At present, in order to actively eliminate noise, people have invented the technology of "active noise reduction". Its principle is: all sounds are composed of a certain spectrum, if you can find a sound whose spectrum is exactly the same as the noise to be eliminated, but the phase is just opposite (180° difference), you can completely cancel the noise . The key is how to get that noise-cancelling sound. The actual method is to start from the noise source itself and try to reverse the phase of the original noise through the electronic circuit. [0003] Nowadays, more and more headphones use active noise reduction technology. Active noise reduction technology is divided into two types: digital noise reduction and analog noise reduction. For analog active noise reduction techno...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a filter circuit for noise-canceling earphones, aiming to solve the problem that the noise-canceling circuit of the feed-forward noise-canceling earphones in the prior art uses the above-mentioned discrete components or uses a dedicated noise-canceling chip to cooperate with an external circuit to achieve noise reduction. way, there is a situation where the overall noise reduction bandwidth is narrow, and the noise reduction bandwidth is about 100HZ to 500HZ, which cannot achieve noise reduction in a wider frequency range, the noise reduction effect is not ideal, and the fitting degree of the frequency response curve is not good. high problem

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