CN207869248U - Recording can noise reduction law-enforcing recorder - Google Patents
Recording can noise reduction law-enforcing recorder Download PDFInfo
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- CN207869248U CN207869248U CN201721816284.7U CN201721816284U CN207869248U CN 207869248 U CN207869248 U CN 207869248U CN 201721816284 U CN201721816284 U CN 201721816284U CN 207869248 U CN207869248 U CN 207869248U
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Abstract
The utility model disclose a kind of recording can noise reduction law-enforcing recorder, including crime scene investigation device shell, microphone, audio processing chip, main control chip and memory, microphone, audio processing chip, main control chip and memory are placed in crime scene investigation device shell, the input terminal of microphone is in contact with the surface of crime scene investigation device shell, the output end of microphone is electrically connected with the input terminal of audio processing chip, the output end of audio processing chip is connected with the input terminal of main control chip, and the output end of main control chip is connected with memory；Audio processing chip includes analog-to-digital conversion unit and noise suppression unit, the audio input end of analog-to-digital conversion unit is connected with the output end of microphone, the data output end of analog-to-digital conversion unit is connected with the data input pin of noise suppression unit, and the data output end of noise suppression unit is connected with the input terminal of main control chip.It is prodigious convenient that the utility model can provide for the law enforcement recording process of law-enforcing recorder, improves the working efficiency of law enfrocement official.
Description
Technical field
The utility model is related to the technical field of crime scene investigation device more particularly to a kind of recording can noise reduction law-enforcing recorder.
Background technology
Law-enforcing recorder is also known as police law-enforcing recorder or on-site law-enforcing recorder.Collect digital vedio recording, recording, digital photograph
Phase, intercommunication transmitter function, can in enforcing law into Mobile state, static field condition digitized record, just
It enforces the law in various environment use in public security cadres and police.Law-enforcing recorder currently on the market is during recording, camera shooting to audio
The processing of signal encodes typically by acquisition, storage and etc..However, inevitably can be by each during audio collection
The interference of kind noise, under some stronger background noises, only by simple acquisition, without doing some processing to audio.Afterwards, this
People will necessarily be greatly affected to the accuracy of people's speech recognition for the audio that sample collects, this will be largely effected on
The high efficiency of law enfrocement official's work.
It is " CN206698401U " in Chinese utility model patent notification number, patent name is a kind of " realization diamylose gram drop
A kind of earphone for realizing diamylose gram noise reduction is disclosed in the patent document of the earphone made an uproar ", the earphone includes headset main body, and
The control device being electrically connected with the headset main body, the headset main body front end have receiver, the built-in call of the control device
Microphone, the call microphone include the first sound collection unit and speech activity detection unit；The headset main body rear end
A cavity, noise reduction microphone built in the cavity are formed, the noise reduction microphone includes second sound collecting unit, noise parameter
Computing unit and noise suppression unit.A kind of earphone for realizing diamylose gram noise reduction that the utility model provides, in active noise reduction
On the basis of inhibited by assisting Mike to acquire noise converse main Mike of ambient noise, effective inhibition stationary noise
Meanwhile the nonstationary noise in filtering environmental.If noise suppression unit applies in law-enforcing recorder, it will be law enforcement information
Acquisition provide great convenience.
Utility model content
Shortcoming present in view of the above technology, the utility model provide a kind of recording of effective acquisition audio-frequency information
Can noise reduction law-enforcing recorder.
In order to achieve the above object, a kind of recording of the utility model can noise reduction law-enforcing recorder, including crime scene investigation device shell,
Microphone, audio processing chip, main control chip and memory, the microphone, audio processing chip, main control chip and are deposited
Reservoir is placed in crime scene investigation device shell, and the input terminal of the microphone is in contact with the surface of crime scene investigation device shell, the Mike
The output end of wind is electrically connected with the input terminal of audio processing chip, the output end of the audio processing chip and main control chip it is defeated
Enter end to be connected, the output end of the main control chip is connected with memory；The audio processing chip include analog-to-digital conversion unit with
And noise suppression unit, the audio input end of the analog-to-digital conversion unit are connected with the output end of microphone, the analog-to-digital conversion
The data output end of unit is connected with the data input pin of noise suppression unit, the data output end of the noise suppression unit with
The input terminal of main control chip is connected.
Wherein, the audio processing chip further includes that wind is made an uproar attentuating filter, the wind make an uproar attentuating filter data it is defeated
Enter end with the data output end of analog-to-digital conversion unit to be connected, the wind is made an uproar data output end and the noise suppressed list of attentuating filter
Member electrical connection.
Wherein, the audio processing chip further includes stereo separation filter, the number of the stereo separation filter
Be connected according to the make an uproar data output end of attentuating filter of input terminal and wind, the data output end of the stereo separation filter with make an uproar
Sound inhibits unit electrical connection.
Wherein, the audio processing chip further includes band equalizer, the data input pin of the band equalizer with it is vertical
The data output end of body sound separation filter is connected, the data output end of the band equalizer and the data of noise suppression unit
Input terminal is electrically connected.
Wherein, the audio processing chip further includes gain control unit, the data input pin of the gain control unit
It is connected with the data output end of noise suppression unit, the data output end of the gain control unit and the input terminal of main control chip
It is connected.
Wherein, the crime scene investigation device shell is equipped with camera, the display screen for showing information and the control of record law enforcement field
Button processed, is additionally provided with power supply unit in the crime scene investigation device shell, the side wall of the crime scene investigation device shell be equipped with convenient for memory into
The opening of row information transmission.
The utility model has the beneficial effects that：
Compared with prior art, the utility model recording can noise reduction law-enforcing recorder, by law-enforcing recorder
Audio processing chip is added, the analog signal that microphone is passed to is carried out sampling conversion by the analog-to-digital conversion unit being internally integrated
At raw digital signal, raw digital signal inhibits the final removal noise signal life of the analysis of unit, processing through internal noise again
At the digital signal of denoising.The decrease of noise functions of the utility model is easily achieved, and can be the law enforcement recording process of law-enforcing recorder
It is prodigious convenient to provide, and improves the working efficiency of law enfrocement official.
Description of the drawings
Fig. 1 be the utility model recording can noise reduction law-enforcing recorder structure chart；
Fig. 2 be the utility model recording can noise reduction law-enforcing recorder structure diagram.
Main element symbol description is as follows：
1, crime scene investigation device shell 2, microphone
3, audio processing chip 4, main control chip
5, memory
11, camera 12, display screen
13, control button
31, analog-to-digital conversion unit 32, noise suppression unit
33, wind is made an uproar attentuating filter 34, stereo separation filter
35, band equalizer 36, gain control unit.
Specific implementation mode
In order to more clearly state the utility model, the utility model is further described below in conjunction with the accompanying drawings.
Refering to fig. 1-2, a kind of recording of the utility model can noise reduction law-enforcing recorder, including crime scene investigation device shell 1, microphone
2, audio processing chip 3, main control chip 4 and memory 5, microphone 2, audio processing chip 3, main control chip 4 and storage
Device 5 is placed in crime scene investigation device shell 1, and the input terminal of microphone 2 is in contact with the surface of crime scene investigation device shell 1, microphone 2 it is defeated
Outlet is electrically connected with the input terminal of audio processing chip 3, the output end of audio processing chip 3 and the input terminal phase of main control chip 4
Even, the output end of main control chip 4 is connected with memory 5；Audio processing chip 3 includes analog-to-digital conversion unit 31 and noise suppressed
The audio input end of unit 32, analog-to-digital conversion unit 31 is connected with the output end of microphone 2, and the data of analog-to-digital conversion unit 31 are defeated
Outlet is connected with the data input pin of noise suppression unit 32, data output end and the main control chip 4 of noise suppression unit 32
Input terminal is connected.
Compared to the prior art, the utility model recording can noise reduction law-enforcing recorder, by law-enforcing recorder
Audio processing chip 3 is added, the analog signal that microphone 2 is passed to is sampled by the analog-to-digital conversion unit 31 being internally integrated
It is converted to raw digital signal, raw digital signal inhibits the final removal noise of the analysis of unit 32, processing through internal noise again
Signal generates the digital signal of denoising.The decrease of noise functions of the utility model is easily achieved, and can be that the law enforcement of law-enforcing recorder is remembered
It is prodigious convenient that record process provides, and improves the working efficiency of law enfrocement official.
Microphone 2：For acquiring audio signal, audio signal is converted to the electric signal of simulation.
Audio processing chip 3：The analog signal that microphone 2 is passed to is carried out by the analog-to-digital conversion unit 31 being internally integrated
Sampling is converted to raw digital signal.Raw digital signal is gone through internal analysis, the final removal noise signal generation of processing again
The digital signal made an uproar.
Main control chip 4：Pass through professional audio interface（I2S）The denoising digital signal that audio processing chip 3 generates is received, it is right
The digital signal of reception carries out coded treatment in inside, then sends the signal encoded to storage device.
Storage device：Store audio data and other data.
In the present embodiment, audio processing chip 3 further includes that wind is made an uproar attentuating filter 33, and wind is made an uproar the number of attentuating filter 33
It is connected with the data output end of analog-to-digital conversion unit 31 according to input terminal, make an uproar data output end and the noise of attentuating filter 33 of wind presses down
Unit 32 processed is electrically connected.Wind attentuating filter 33 of making an uproar detection wind can make an uproar automatically, detect that the make an uproar wind that will decay automatically of wind is made an uproar, and move
Adjust level of attenuation to state.
In the present embodiment, audio processing chip 3 further includes stereo separation filter 34, stereo separation filter 34
The make an uproar data output end of attentuating filter 33 of data input pin and wind be connected, the data output end of stereo separation filter 34
It is electrically connected with noise suppression unit 32.Stereo separation filter 34 is used for 2 recording data of stereophony microphone and playback
Data separating can effectively avoid echo.
In the present embodiment, audio processing chip 3 further includes band equalizer 35, the data input pin of band equalizer 35
It is connected with the data output end of stereo separation filter 34, data output end and the noise suppression unit 32 of band equalizer 35
Data input pin electrical connection.Band equalizer 35 has the function of various filters, for the preliminary place to each frequency band of audio
Reason.
In the present embodiment, audio processing chip 3 further includes gain control unit 36, and the data of gain control unit 36 are defeated
Enter end with the data output end of noise suppression unit 32 to be connected, data output end and the main control chip 4 of gain control unit 36
Input terminal is connected.It with automatic gain control function, can make the sound of output in suitable range, ensure the sound of output not
It can be too small or excessive.
In the present embodiment, crime scene investigation device shell 1 is equipped with the camera 11 of record law enforcement field, shows the display screen of information
12 and control button 13, power supply unit is additionally provided in crime scene investigation device shell 1, and the side wall of crime scene investigation device shell 1 is equipped with convenient for storage
The opening that device 5 is transmitted into row information.
Disclosed above is only several specific embodiments of the utility model, but the utility model is not limited to this,
The changes that any person skilled in the art can think of should all fall into the scope of protection of the utility model.
Claims (6)
1. a kind of recording can noise reduction law-enforcing recorder, which is characterized in that including crime scene investigation device shell, microphone, audio frequency process core
Piece, main control chip and memory, the microphone, audio processing chip, main control chip and memory are placed in law enforcement
In instrument shell, the input terminal of the microphone is in contact with the surface of crime scene investigation device shell, the output end and audio of the microphone
The input terminal of processing chip is electrically connected, and the output end of the audio processing chip is connected with the input terminal of main control chip, the master
The output end of control chip is connected with memory；The audio processing chip includes analog-to-digital conversion unit and noise suppression unit,
The audio input end of the analog-to-digital conversion unit is connected with the output end of microphone, the data output end of the analog-to-digital conversion unit
It is connected with the data input pin of noise suppression unit, the data output end of the noise suppression unit and the input terminal of main control chip
It is connected.
2. recording according to claim 1 can noise reduction law-enforcing recorder, which is characterized in that the audio processing chip is also
It makes an uproar attentuating filter including wind, the wind is made an uproar the data input pin of attentuating filter and the data output end phase of analog-to-digital conversion unit
Even, the make an uproar data output end of attentuating filter of the wind is electrically connected with noise suppression unit.
3. recording according to claim 2 can noise reduction law-enforcing recorder, which is characterized in that the audio processing chip is also
Including stereo separation filter, data input pin and the wind of the stereo separation filter make an uproar attentuating filter data it is defeated
Outlet is connected, and the data output end of the stereo separation filter is electrically connected with noise suppression unit.
4. recording according to claim 3 can noise reduction law-enforcing recorder, which is characterized in that the audio processing chip is also
Including band equalizer, the data input pin of the band equalizer is connected with the data output end of stereo separation filter,
The data output end of the band equalizer is electrically connected with the data input pin of noise suppression unit.
5. recording according to claim 1 can noise reduction law-enforcing recorder, which is characterized in that the audio processing chip is also
Including gain control unit, the data input pin of the gain control unit is connected with the data output end of noise suppression unit,
The data output end of the gain control unit is connected with the input terminal of main control chip.
6. recording according to claim 1 can noise reduction law-enforcing recorder, which is characterized in that set on the crime scene investigation device shell
There is the camera of record law enforcement field, show the display screen and control button of information, electricity is additionally provided in the crime scene investigation device shell
Source unit, the side wall of the crime scene investigation device shell are equipped with the opening transmitted into row information convenient for memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721816284.7U CN207869248U (en) | 2017-12-22 | 2017-12-22 | Recording can noise reduction law-enforcing recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721816284.7U CN207869248U (en) | 2017-12-22 | 2017-12-22 | Recording can noise reduction law-enforcing recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207869248U true CN207869248U (en) | 2018-09-14 |
Family
ID=63465915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721816284.7U Active CN207869248U (en) | 2017-12-22 | 2017-12-22 | Recording can noise reduction law-enforcing recorder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207869248U (en) |
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2017
- 2017-12-22 CN CN201721816284.7U patent/CN207869248U/en active Active
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