CN106344064B

CN106344064B - Audio signal acquisition device and acquisition method

Info

Publication number: CN106344064B
Application number: CN201610855334.6A
Authority: CN
Inventors: 陈志�; 龚政; 邹太奇
Original assignee: Zhuhai Aikesuo Mobile Medical Technology Co ltd
Current assignee: Zhuhai Aiwei Medical Equipment Co ltd
Priority date: 2016-09-26
Filing date: 2016-09-26
Publication date: 2020-08-18
Anticipated expiration: 2036-09-26
Also published as: WO2018053993A1; CN106344064A

Abstract

The invention discloses an audio signal acquisition device and an audio signal acquisition method, which comprise a stethoscope main body and a vibrating diaphragm arranged on the stethoscope main body, wherein a first audio acquisition module for acquiring vibration audio generated by the vibrating diaphragm, a second audio acquisition module for acquiring environmental noise and a main control processing module are arranged in the stethoscope main body, the main control processing module receives audio data from the first audio acquisition module and the second audio acquisition module, and the audio signals are subjected to noise reduction processing, wherein the noise reduction processing generates an acoustic reversed-phase spectrum to offset a noise spectrum through the function processing of a DSP (digital signal processor) so as to acquire the audio signals after noise reduction, and the integral trimming is carried out on an algorithm so as to reduce the interference of the environmental noise by more than 93 percent, thereby ensuring that the acquisition of the data is not distorted, and further enabling the audio of an electronic stethoscope to be clearer and more reliable.

Description

Audio signal acquisition device and acquisition method

Technical Field

The invention relates to the technical field of stethoscopes, in particular to an audio signal acquisition device and an audio signal acquisition method.

Background

Traditional medical stethoscope of physics is through the external sound that acquires human internal organs activity, adopt inclosed pipeline and human cochlea to wear the back together and form an airtight cavity, utilize resonance principle to absorb cardiopulmonary vibration energy through gathering the vibrating diaphragm, gather the air in the vibrating diaphragm and the cardiopulmonary compression airtight pipeline after producing synchronous vibrations with the eardrum of cochlea department of this vibration conduction, make it produce corresponding synchronous vibration signal, thereby let the user can hear cardiopulmonary sound, the frequency conversion physics stethoscope of some high-ends, can be through the chamber way of switching different bores, realize audio signal amplification to a certain extent. However, the conventional stethoscope has the disadvantages of discomfort of external auditory meatus, easiness in disturbing tone quality and the like caused by the problem of pressure of the pressure tube, meanwhile, signal amplification is carried out only by switching the meatuses with different calibers, the amplification factor is extremely limited, and background noise can be synchronously amplified when audio amplification is carried out in a physical mode. So that the doctor can not make a diagnosis in time, and the diagnosis basis is mainly according to the experience of the doctor, and the accuracy is poor. On the other hand, the sensitivity of human ears to sound is a combined effect of sound intensity and frequency, so that some pathological features are difficult to capture. It is necessary to design a novel stethoscope to perform quantitative and accurate analysis of auscultation sounds.

The medical electronic stethoscope is generally formed by connecting a sound probe provided with a miniature sound pick-up, an earplug which can convert an electric signal into an acoustic signal and an amplifier consisting of electronic elements in series, can detect the visceral organ sounds of a human body in real time, and can amplify the detected visceral organ sounds through an audio signal amplifying circuit, so that slight physiological and pathological sounds are stronger than the sounds of the traditional physical stethoscope, and the sounds can be stored and played back for clinical diagnosis analysis and medical record data storage. However, the existing medical electronic stethoscope collects sounds by using a single sound pick-up, so that the noise is high, and the volume is increased only by amplifying signals, so that the interference noise is also amplified while the target heart sound is amplified, so that some pathological features are difficult to capture and even misdiagnosis is caused under certain conditions, and sometimes the reliability of the existing medical electronic stethoscope is not as good as that of the traditional physical stethoscope.

Disclosure of Invention

In order to solve the technical defects of the existing stethoscope, the invention provides an audio signal acquisition device and an audio signal acquisition method.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides an audio signal collection system, includes the stethoscope main part and sets up the vibrating diaphragm in the stethoscope main part, the stethoscope main part embeds there is the first audio acquisition module that is used for gathering the vibration audio frequency that the vibrating diaphragm produced, the second audio acquisition module that is used for gathering the ambient noise to and with main control processing module, main control processing module receives and comes from first audio acquisition module and second audio acquisition module's audio data, main control processing module embeds there is the processing circuit that makes an uproar that falls that is used for handling audio data.

Preferably, an audio conversion circuit for restoring the audio signal to the vibration signal is further disposed in the main control processing module.

Preferably, a wireless communication module is further arranged in the stethoscope main body, and the master control processing module sends the audio signal to the wireless terminal through the wireless communication module.

Preferably, the noise reduction processing circuit is an ANC noise reduction circuit.

Preferably, the stethoscope main body is further provided with a single-lead electrocardiogram acquisition module and a contact connected with the single-lead electrocardiogram acquisition module.

An audio signal collecting method based on the audio signal collecting device comprises the following steps:

the heart and lung organ vibration audio and the environmental noise generated at the vibrating diaphragm are synchronously acquired by the audio acquisition modules at two different point positions, and the acoustic reversed-phase spectrum is generated through the function processing of the DSP to offset the noise spectrum so as to acquire the audio signal after noise reduction.

Further, the audio signal after noise reduction is processed by the CODEC and the DSP to form a digital audio signal.

After the steps are completed, the method also comprises the following steps:

and performing function conversion on the audio signal, converting the speed and frequency of the sound wave propagating in the air density into the speed and frequency of the sound wave propagating in the human body density, converting the speed and frequency of the sound wave propagating in the human body density into a waveform signal, and generating a vibration signal by taking the frequency of the waveform signal as the vibration frequency.

Furthermore, the audio signal or the vibration signal is sent to the wireless terminal in a wireless mode or uploaded to a cloud sharing device.

The invention has the beneficial effects that: the audio signal collection system adopts the audio acquisition module of two different position points to collect heart lung viscera vibration audio frequency and the background environment noise that vibrating diaphragm department produced in step, audio signal is through falling the noise treatment, wherein, the function processing that falls the noise treatment process through DSP produces the reverse wave spectrum of acoustics and offsets the noise wave spectrum, in order to obtain the audio signal after falling the noise, carry out the integration on the algorithm and repair about reaching the interference that reduces the environmental noise more than 93%, the collection undistorted of having guaranteed data, thereby make the audio frequency of electron stethoscope clearer, it is more reliable.

Drawings

The following further describes embodiments of the present invention with reference to the drawings.

FIG. 1 is a schematic perspective view of an audio signal acquisition device according to the present invention;

FIG. 2 is a block diagram of the operation of the audio signal acquisition device of the present invention;

FIG. 3 is a flowchart illustrating steps of an embodiment of the present invention.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 1 and 2, an audio signal collecting device includes a stethoscope main body 1 and a diaphragm 11 disposed on the stethoscope main body 1, the stethoscope main body 1 is provided with a first audio collecting module 3 for collecting vibration audio generated by the diaphragm 11, a second audio collecting module 4 for collecting environmental noise, and a main control processing module 2, the main control processing module 2 receives audio data from the first audio collecting module 3 and the second audio collecting module 4, and the main control processing module 2 is provided with a noise reduction processing circuit 21 for processing the audio data. After the audio signal is subjected to noise reduction processing, the data acquisition is guaranteed not to be distorted, so that the audio of the electronic stethoscope is clearer and more reliable.

Referring to fig. 2, in the embodiment, an audio conversion circuit 22 for restoring the audio signal to the vibration signal is further disposed in the main control processing module 2, and the collected vibration audio is converted from the digitized signal to the clearer vibration signal through the audio conversion circuit 22, so that the user can obtain the vibration effect closest to the feeling of the traditional physical medical stethoscope.

Referring to fig. 2, in the embodiment, a wireless communication module 5 is further disposed in the stethoscope main body 1, and the main control processing module 2 sends an audio signal to the wireless terminal through the wireless communication module 5. Wireless communication module 5 that adopts in this embodiment is bluetooth module and WIFI module, and audio signal can adopt audio playback or vibration reduction form to restore out, also is convenient for preserve, can playback, enlarge and reproduce, for example: the diagnosis can be remotely carried out by sending the diagnosis to a cardiologist through e-mail, APP or remote interactive software, and the diagnosis result is confirmed.

In addition, the stethoscope main body 1 is further provided with a single-lead electrocardiogram acquisition module 6 and a contact 12 connected with the single-lead electrocardiogram acquisition module 6, as shown in fig. 2, the single-lead electrocardiogram acquisition module 6 is used for acquiring ECG waveforms, and the real-time heart rate of a patient can be checked in real time.

In the embodiment, the noise reduction processing circuit 21 is an ANC noise reduction circuit, specifically, a special microphone WM-64AT for the frequency response of the soft horn is adopted, the sensitivity can reach-45 dB, and the typical frequency response is relatively stable.

the heart and lung organ vibration audio and the environmental noise generated at the vibrating diaphragm 11 are synchronously acquired by the audio acquisition modules at two different point positions, and the acoustic reversed-phase spectrum is generated through the function processing of the DSP to offset the noise spectrum so as to obtain the audio signal after noise reduction, so that the interference of the environmental noise reduced by more than 93 percent is reduced by performing integral modification on the algorithm. The reproduction efficiency of the bass target frequency is improved by using the principle of sound quality conversion of the fundamental frequency missing (missing fundamental).

The audio signal after noise reduction is processed by electrical signal processing through the CODEC and the DSP to form a digital audio signal, and the distortion degree of the audio signal is further reduced.

After the steps are completed, the method also comprises the following steps:

Furthermore, audio signal or vibration signal are sent to the wireless terminal or uploaded to the cloud sharing in a wireless mode, so that the audio playing or vibration reduction mode can be adopted for reduction, the storage is convenient, the playback, amplification and reproduction can be realized, the remote real-time cloud sharing of data can be realized through the network technology, the synchronous reproduction can be realized on a plurality of local and remote terminals, and the real-time remote diagnosis function can be realized.

Referring to fig. 3, the present invention is further illustrated by the following specific steps of the example:

step 1, synchronously collecting heart and lung organ vibration audio and environmental noise generated at a vibrating diaphragm 11 of a stethoscope by using audio acquisition modules at two different point positions, and generating an acoustic reversed-phase spectrum to offset a noise spectrum through function processing of a DSP (digital signal processor) so as to obtain an audio signal subjected to noise reduction;

step 2, the audio signal after noise reduction is subjected to electrical signal processing through a CODEC and a DSP to form a digital audio signal;

step 3, performing function conversion on the audio signal, converting the speed and frequency of sound wave propagation in the air density into the speed and frequency of sound wave propagation in the human body density, converting the speed and frequency of sound wave propagation in the human body density into a waveform signal, and generating a vibration signal by taking the frequency of the waveform signal as the vibration frequency;

and 4, sending the audio signal or the vibration signal to a wireless terminal in a wireless mode or uploading the audio signal or the vibration signal to a cloud terminal for sharing.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the structure of the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means.

Claims

1. An audio signal acquisition method based on an audio signal acquisition device is characterized in that: the method comprises the following steps:

synchronously acquiring heart and lung organ vibration audio and environmental noise generated at a vibrating diaphragm by using audio acquisition modules at two different point positions, and generating an acoustic reversed-phase spectrum to offset a noise spectrum through function processing of a DSP (digital signal processor) so as to acquire an audio signal subjected to noise reduction;

the audio signal after noise reduction is subjected to electrical signal processing through a CODEC and a DSP to form a digital audio signal;

performing function conversion on the audio signal, converting the speed and frequency of sound wave propagating in the air density into the speed and frequency of sound wave propagating in the human body density, converting the speed and frequency of sound wave propagating in the human body density into a waveform signal, and generating a vibration signal by taking the frequency of the waveform signal as vibration frequency;

the audio signal collection system comprises a stethoscope main body and a vibrating diaphragm arranged on the stethoscope main body, wherein a first audio collection module used for collecting vibration audio generated by the vibrating diaphragm, a second audio collection module used for collecting environmental noise and a master control processing module are arranged in the stethoscope main body, the master control processing module receives audio data from the first audio collection module and the second audio collection module, a noise reduction processing circuit used for processing the audio data is arranged in the master control processing module, and an audio conversion circuit used for restoring the audio signal into the vibration signal is further arranged in the master control processing module.

2. The audio signal acquisition method according to claim 1, characterized in that: and sending the audio signal or the vibration signal to a wireless terminal in a wireless mode or uploading the audio signal or the vibration signal to a cloud sharing device.