Pickup, pickup equipment and method for eliminating noise

A sound pickup device and technology for pickups, which are applied in the field of pickups, pickup equipment and noise elimination, can solve problems such as the impact of ambient noise on pickup equipment, and achieve the effects of improving pickup accuracy and stability and eliminating ambient noise.

Pending Publication Date: 2018-09-25
GEER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Various aspects of the present application provide a sound pickup, a sound pickup device and a method for eliminating noise, so as to solve the problem that the existing sound pickup device is affected by environmental noise

Method used

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  • Pickup, pickup equipment and method for eliminating noise
  • Pickup, pickup equipment and method for eliminating noise
  • Pickup, pickup equipment and method for eliminating noise

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Experimental program
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Embodiment approach

[0058] Optionally, an implementation manner of performing noise reduction processing on the mixed signal collected by the first microphone 4 by using the environmental noise signal collected by the second microphone 5 to obtain a useful sound signal includes:

[0059] a, the environmental noise signal collected by the second microphone 5 and the mixed signal collected by the first microphone 4 are used as input parameters to input the LMS adaptive filter;

[0060] b, in the LMS adaptive filter, the environmental noise signal collected by the second microphone 5 is multiplied by the adaptive coefficient to approach the noise signal in the mixed signal collected by the first microphone 4, and the mixed signal collected by the first microphone 4 is obtained and The difference of the ambient noise signal multiplied by the adaptive coefficient is taken as the useful sound signal.

[0061] Such as Figure 4 As shown, the specific steps of using LMS filter to obtain useful sound sig...

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Abstract

The embodiment of the invention provides a pickup, pickup equipment and a method for eliminating noise. In the embodiment of the invention, a mixed signal acquired by a first microphone is encoded anddecoded by an audio encoding and decoding chip and then is input into a processor chip; an environmental noise signal acquired by a second microphone is encoded and decoded by the audio encoding anddecoding chip and then is input into the processor chip; and the processor chip reduces the noise of the mixed signal processed by the audio encoding and decoding chip by using the environmental noisesignal processed by the audio encoding and decoding chip, so as to output an available sound signal. The environmental noise signal and the noise signal in the mixed signal acquired by the first microphone are counteracted, so as to acquire the available sound signal; and therefore, an aim of eliminating the environmental noise is fulfilled, and the measurement precision and the stability of thepickup equipment are improved.

Description

technical field [0001] The invention relates to the field of electronic products, in particular to a sound pickup, a sound pickup device and a method for eliminating noise. Background technique [0002] Sphygmomanometers are medical instruments used to measure blood pressure, and electronic sphygmomanometers occupy most of the household sphygmomanometer market due to their easy operation. The electronic sphygmomanometer that is most used in daily life provides pulse and blood pressure display, and is easy to operate especially for the elderly. [0003] The measurement method of most sphygmomanometers is to simulate the traditional listening method. During the test process, it is necessary to record the Keshi sound of the heartbeat, and find the pressure value corresponding to the first heartbeat and the last heartbeat in the recording, as the test result, which is unavoidable. Affected by environmental noise, and what is finally presented to the user is only a blood pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/08H04R3/04
CPCH04R1/08H04R3/04H04R2430/00
Inventor 栾浩杰
Owner GEER TECH CO LTD
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