Dual-microphone noise reduction method and device for medical acoustic signals

A dual-microphone, acoustic signal technology, applied in the field of digital signal processing of medical equipment, can solve problems such as interference

Inactive Publication Date: 2015-04-29
BEIJING YIMAI MEDICAL TECH CO LTD
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  • Description
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Problems solved by technology

[0013] The technical problem to be solved by the present invention is: aiming at the interference of environmental noise in the medical

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  • Dual-microphone noise reduction method and device for medical acoustic signals
  • Dual-microphone noise reduction method and device for medical acoustic signals
  • Dual-microphone noise reduction method and device for medical acoustic signals

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Embodiment Construction

[0034] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] Such as figure 1 As shown, the dual-microphone denoising method provided by the present invention includes four parts: peripheral analysis, feature extraction, masking separation and signal reconstruction.

[0036] Wherein, the peripheral analysis obtains noisy medical acoustic signal data and environmental noise data, and processes the two sets of data respectively, and the obtained result is a time-frequency unit, which is used for feature extraction and signal reconstruction;

[0037] The feature extraction is to calculate a feature value for the time-frequency unit for masking separation;

[0038] In the masking separation, a masking value is generated accordi...

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Abstract

The invention discloses a dual-microphone noise reduction method and device applied to medical acoustic signals such as heart and lung sounds, fetal heart sounds and the like. The dual-microphone noise reduction method for the medical acoustic signals comprises steps as follows: acquiring medical acoustic signal data with noises and ambient noise data, and processing the medical acoustic signal data and the ambient noise data respectively to obtain a time-frequency unit; calculating a characteristic value for the time-frequency unit; generating a masking value according to the relation between the characteristic value and a masking threshold, and marking a part, which mainly comprises the medical acoustic signals, of the time-frequency unit; masking the time-frequency unit of the medical acoustic signal data with the noises according to the generated masking value, reserving the part which mainly comprises the medical acoustic signals, and reconstructing the masked data to obtain a noise reduction result. According to the noise reduction method, the medical acoustic signals with the noises and ambient noises are acquired respectively by the aid of dual microphones, and the medical acoustic signals and the ambient noises are effectively separated.

Description

technical field [0001] The invention relates to the field of digital signal processing of medical equipment, in particular to a dual-microphone noise elimination method and device for medical sound signals. Background technique [0002] Cardiovascular diseases and respiratory diseases are common and frequently-occurring diseases that endanger human health. With the enhancement of people's awareness of health care, there is a need for cardiopulmonary health monitoring. [0003] Common diagnostic methods for heart disease include electrocardiography, echocardiography, and auscultation. The electrocardiogram reflects the electrical activity characteristics of the heart and can be used to identify arrhythmias and atrial and ventricular functional defects. However, the electrocardiogram is not accurately related to the contraction and relaxation of the ventricle, and it cannot be completely concluded that the heart is functioning normally from a normal electrocardiogram. Echoca...

Claims

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Application Information

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IPC IPC(8): H04R3/00H04R1/08
Inventor 杨闻笛姜汉钧杨开李冬梅张春王志华
Owner BEIJING YIMAI MEDICAL TECH CO LTD
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