CN105989848A - Noise reduction device and medical apparatus - Google Patents
Noise reduction device and medical apparatus Download PDFInfo
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- CN105989848A CN105989848A CN201510051258.9A CN201510051258A CN105989848A CN 105989848 A CN105989848 A CN 105989848A CN 201510051258 A CN201510051258 A CN 201510051258A CN 105989848 A CN105989848 A CN 105989848A
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Abstract
The invention discloses a noise reduction device and a medical apparatus. The noise reduction device is used for suppressing noise in an audio input, and the audio input has a silent period and a speech period. The noise reduction device comprises a reference noise spectrum database, a Fourier converter, a judgment unit and a Fourier inverse transformer, and further comprises a noise suppression unit and/or a noise elimination unit. The judgment unit judges whether the audio input is in the silent period or in the speech period. When the audio input is in the silent period, the noise suppression unit is started. When the audio input is in the speech period, the noise elimination unit is started. The noise suppression unit reduces the amplitude of a frequency-domain signal. The noise elimination unit subtracts a proportion of reference noise spectrum from the frequency-domain signal. The Fourier inverse transformer transforms the output of the noise suppression unit and/or the noise elimination unit into a time-domain signal.
Description
Technical field
The present invention relates to noise processed, particularly the noise suppression of medical apparatus and instruments.
Background technology
When doing CT examination, the doctor in operating room and the patient in inspection chamber need to link up, and this is made by the doctors and patients of CT machine
Communication system realizes.But the air-conditioning of inspection chamber, CT machine rotating disk and fan can produce certain noise, and this just makes doctor
There is noise clearly during the patient's voice heard from the speaker controlling box, affect doctor and judge the real needs of sufferer.
Summary of the invention
In view of this, the present invention proposes a kind of denoising device and medical apparatus and instruments.
According to the first aspect of the invention, it is provided that a kind of denoising device, the noise in suppression one audio frequency input, described audio frequency
Input has quiet period and speech period, and described denoising device includes a reference noise modal data storehouse, a Fourier transformer, one sentences
Disconnected unit and an inverse Fourier transform device, also include a noise suppression unit and/or a noise reduction unit；Described reference noise is composed
Data base provides a reference noise spectrum NRF (), wherein f is frequency；Described audio frequency Input transformation is by described Fourier transformer
One frequency-region signal S (f)；Described judging unit its compose N according to described frequency-region signal S (f) and described reference noiseRF () judges institute
State audio frequency input and be in quiet period or speech period；When the input of described audio frequency is in quiet period, start described noise suppression unit；
When the input of described audio frequency is in speech period, start described noise reduction unit；Described noise suppression unit reduces described frequency domain letter
The amplitude of number S (f), obtainsDescribed noise reduction unit deducts described reference noise spectrum from described frequency-region signal S (f)
NRF one ratio of (), obtainsDescribed inverse Fourier transform device, it is by described noise suppression unit and/or described noise
The output of reduction unitIt is transformed to a time-domain signal.
In one embodiment, in described noise suppression unit,Decay factor cdIt is one less than 1 just
Number.
In one embodiment, in described noise reduction unit,K is a positive number,
W (f) is the normalized weighing factors of a dependent Frequency.
In one embodiment, described judging unit its compose N according to described frequency-region signal S (f) and described reference noiseRBetween (f)
Distance Dist and one first predetermined threshold Threshhold1Judge that the input of described audio frequency is in quiet period or speech period, whereinThreshhold1Being a positive number, W is the maximum of f；If
Dist≤Threshhold1, described judging unit judges that the input of described audio frequency is in quiet period；Otherwise, described judging unit judges
The input of described audio frequency is in speech period.
In one embodiment, Threshhold1=5dB.
In one embodiment, also include a reference noise spectrum updating block, when described judging unit judges that the input of described audio frequency is in
During quiet period, described reference noise spectrum updating block updates reference noise spectrum NR(f)。
In one embodiment, described reference noise spectrum updating block updates reference noise spectrum N with following formulaR(f):
NR(f)=w1(t)*NR(f)+w2(t) * S (f), wherein weight coefficient w1(t) and w2T () is positive number, and w1(t)+w2(t)=1,
Wherein t is the time.
In one embodiment,Wherein LSLength for a upper speech period.
In one embodiment, 2≤K≤3.
In one embodiment, described noise reduction unit also includes a residual noise processing unit, described residual noise processing unit
Judge in N continuous frame audio signalContinuous frame number M, if M≤threshhod2, thenWherein min () is for going minimum value function, N >=2, i=-(N-1) ,-(N-2) ..., 0,With-i frame before Fen BieweiingAnd NR(f), 1≤threshhod2≤N。
According to the second aspect of the invention, it is provided that a kind of medical apparatus and instruments, including a denoising device as described above.
From such scheme it can be seen that the denoising device of the present invention and medical apparatus and instruments can judge quiet period that audio frequency inputs and
Speech period, and suppress noise and/or the noise mixed in speech period abatement voice in quiet period, thus it is comfortable to improve audition
Degree and/or speech intelligibility.In one embodiment, moreover it is possible to reduce time-varying noise.If denoising device by existing hardware with
Firmware or software realize, and the present invention also has the feature of economy.
Accompanying drawing explanation
The preferred embodiments of the present invention will be described in detail by referring to accompanying drawing below, and make those of ordinary skill in the art more clear
The above and other feature and advantage of the Chu present invention, in accompanying drawing:
Figure 1A is the schematic diagram of the CT equipment according to the first embodiment of the present invention.
Figure 1B is the schematic diagram of the denoising device shown in Figure 1A.
Fig. 2 is the schematic diagram of the CT equipment according to the second embodiment of the present invention.
In above-mentioned accompanying drawing, the reference used is as follows:
100；200 CT equipment 126；226 denoising devices
102；202 frames 128；228 inspection chambers
104；204 frame stationary part controllers 130；230 operating rooms
205 computer 132 reference noise modal data storehouses
106；206 cooling fan 133 data decoder
108；208 rotate driving 134 Fourier transformers
110；210 detected object 136 judging units
112；212 first speaker 138 reference noise spectrum updating blocks
114；214 first audio collection device 140 noise suppression unit
116；216 control station 142 noise reduction unit
118；218 second speaker 144 residual noise processing units
120；220 second audio collection device 146 inverse Fourier transform devices
122；222 operator 148 data encoders
124；224 phone systems
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, the most detailed to the present invention by the following examples
Explanation.
Figure 1A is the schematic diagram of the CT equipment 100 according to the first embodiment of the present invention.As shown in Figure 1A, CT equipment
100 include frame 102 and a control station 116.Frame 102 and control station 116 lay respectively at an inspection chamber 128 and
In operating room 130, the operator 122 in operating room 130 may utilize CT equipment 100 and is subject to the one of inspection chamber 128
Inspection object 110 makees image check.In checking process, detected object 110 and operator 122 utilize a phone system 124
Link up.Phone system 124 includes one first speaker 112,1 first audio collection device 114,1 second speaker 118
With one second audio collection device 120.First speaker 112 and the first audio collection device 114 are arranged in frame 102,
Second speaker 118 and the second audio collection device 120 are arranged on control station 116.
In frame 102, having a cooling fan 106 and to rotate driving 108, they are main in inspection chamber 128
Noise source.For improving the quality of voice that hear from the second speaker 118, that transmitted by the first audio collection device 114,
CT equipment 100 can farther include a denoising device 126.In the present embodiment, denoising device 126 is arranged at a frame
Stationary part controller 104, is realized by firmware, so can change or add the hardware of CT equipment 100.Frame
Stationary part controller 104 is positioned in frame 102, and Figure 1A is for clarity sake and by frame stationary part controller 104
It is plotted in outside frame 102.First speaker the 112, first audio collection device the 114, second speaker 118 and the second audio frequency are adopted
Storage 120 is respectively connecting to denoising device 126.
Figure 1B is the schematic diagram of the denoising device 126 shown in Figure 1A.Denoising device 126 includes a reference noise modal data
Storehouse 132, one Fourier transformer 134, judging unit 136, noise suppression unit 140, noise reduction unit
142 and an inverse Fourier transform device 146.If the first audio collection device 114 is output as communication data packets, denoising device
126 also include a data decoder 133, and it receives the output of the first audio collection device 114 and resolves from communication data packets
Go out the audio digital signal audio frequency input as Fourier transformer 134.The input of this audio frequency has quiet period and speech period.
So-called speech period refers to that the time period that detected object 110 is spoken, so-called quiet period refer to when detected object 110 is dumb
Between section.
Reference noise modal data storehouse 132 provides a reference noise spectrum NRF (), wherein f is frequency.Reference noise spectrum NRF () can
Obtain in advance, noise condition when reflection detected object 110 is silent.Audio frequency Input transformation is by Fourier transformer 134
One frequency-region signal S (f).Judging unit 136 composes N according to frequency-region signal S (f) and reference noiseRF () judges that audio frequency input is in
Quiet period or speech period.When audio frequency input is in quiet period, start noise suppression unit 140.When audio frequency input is in voice
During the phase, start noise reduction unit 142.Judging unit 136 can compose N according to frequency-region signal S (f) and reference noiseRBetween (f)
Distance Dist and one first predetermined threshold Threshhold1Judge that audio frequency input is in quiet period or speech period, whereinThreshhold1Being a positive number, such as 5dB, W is the maximum of f
Value.If Dist≤Threshhold1, it is judged that unit 136 judges that audio frequency input is in quiet period.Otherwise, it is judged that unit 136 is sentenced
Staccato frequency input is in speech period.
Noise suppression unit 140 reduces the amplitude of frequency-region signal S (f), obtainscdIt is one less than 1 just
Number.So, when quiet period, background noise will be attenuated factor cdSuppression.Decay factor cdValue can be determined by experiment.
Noise reduction unit 142 deducts reference noise spectrum N from frequency-region signal S (f)RF one ratio of (), obtainsK is a positive number, and w (f) is the normalized weighing factors of a dependent Frequency.Due to
Voice signal occupies the major part of frequency spectrum in low-frequency range, and therefore, w (f) can have relatively low value at low frequency.CT turntable rotation
Or the acceleration or deceleration stage that fan rotates, noise spectrum is time-varying, and therefore K can be used for the noise spectrum that regulation is cut down
Global level, in the present embodiment, 2≤K≤3.By increasing or reducing K, the noise spectrum of estimation will be accommodated, to subtract
Gently by the voice distortion of the noise spectrum estimation noise of mistake.
Inverse Fourier transform device 146 is by noise suppression unit and the output of described noise reduction unitIt is transformed to a time domain letter
Number.This time-domain signal will send to data encoder 148, data encoder 148 be packaged as communication data packets and be sent to the
Two speakers 118.
Denoising device 126 may also include a reference noise spectrum updating block 138, when judging unit 136 judges that audio frequency input is in
During quiet period, reference noise spectrum updating block 138 updates reference noise spectrum NR(f).For example, it is possible to update with reference to making an uproar with following formula
Sound spectrum NR(f): NR(f)=w1(t)*NR(f)+w2(t) * S (f), wherein weight coefficient w1(t) and w2T () is positive number, and
w1(t)+w2T ()=1, wherein t is the time.Owing to noise can be affected by voice and w2(t) long-time voice occur during with
Time successively decreases, therefore, in the present embodiment,Wherein LSLength for a upper speech period.
Subtracting, in order to eliminate spectrum, the music noise brought, noise reduction unit 142 may also include a residual noise processing unit 144.
Residual noise processing unit 144 utilizes voice to have successional characteristic, using nearest N continuous frame audio signal as a window
Mouthful, it is judged that whereinContinuous frame number M, if M≤threshhod2, then it is assumed that S (f) is a noise,
Even if S (f) deducts reference noise spectrum NRAfter one ratio of (f),It is still that noise, wherein N >=2,
I=-(N-1) ,-(N-2) ..., 0,With-i frame before Fen BieweiingAnd NR(f),
1≤threshhod2≤N.Then, for smooth noise, can be byIt is set as in above-mentioned windowMinima, i.e.Wherein min () is for going minimum value function.If M > threshhod2, then it is assumed thatIt is voice, in
It is to maintainConstant.
Noise suppression unit 140 and noise reduction unit 142 are respectively used to suppress noise and the noise of speech period of quiet period.
In other embodiments, during denoising device 126 can only include noise suppression unit 140 and noise reduction unit 142
Individual.
Fig. 2 is the schematic diagram of the CT equipment 200 according to the second embodiment of the present invention.As in figure 2 it is shown, CT equipment 200
Including frame 202 and a control station 216.Frame 202 and control station 216 lay respectively at inspection chamber 228 and a behaviour
Making in room 230, the operator 222 in operating room 230 may utilize CT equipment 200 and examined the one of inspection chamber 228
Object 210 makees image check.In checking process, detected object 210 and operator 222 utilize a phone system 224
Link up.Phone system 224 includes one first speaker 212,1 first audio collection device 214,1 second speaker 218
With one second audio collection device 220.First speaker 212 and the first audio collection device 214 are arranged in frame 202,
Second speaker 218 and the second audio collection device 220 are arranged on control station 216.
In frame 202, having a cooling fan 206 and to rotate driving 208, they are main in inspection chamber 228
Noise source.For improving the quality of voice that hear from the second speaker 218, that transmitted by the first audio collection device 214,
CT equipment 200 can farther include a denoising device 226.In the present embodiment, denoising device 226 is arranged at a calculating
On machine 205, realized by software, so can change or add the hardware of CT equipment 200.Frame stationary part
Controller 204 is positioned in frame 202, and for controlling parts static in frame 202, Fig. 2 is for clarity sake and by machine
Frame stationary part controller 204 is plotted in outside frame 202.First speaker the 212, first audio collection device 214, second raise
Sound device 218 and the second audio collection device 220 are respectively connecting to denoising device 226.
Denoising device 226 can have the structure identical with denoising device 126.
Denoising device 226 and denoising device 126 can also be realized by hardware.
Many medical apparatus and instruments have the audio collection device for obtaining voice and corresponding speaker, for mixing in suppression voice
Noise and/or voice interval noise, above-mentioned denoising device 126 and denoising device 226 can also be used for beyond CT equipment
Medical apparatus and instruments.
The denoising device of the present invention and medical apparatus and instruments can judge quiet period and the speech period that audio frequency inputs, and suppress in quiet period
Noise and/or the noise mixed in speech period abatement voice, thus improve audition comfort level and/or speech intelligibility.One
In embodiment, moreover it is possible to reduce time-varying noise.If denoising device is realized with firmware or software by existing hardware, the present invention
Also there is the feature of economy.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention
Within principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (11)
1. a denoising device, the noise in suppression one audio frequency input, the input of described audio frequency has quiet period and speech period,
Described denoising device includes a reference noise modal data storehouse (132), a Fourier transformer (134), a judging unit (136)
With an inverse Fourier transform device (146), also include a noise suppression unit (140) and/or a noise reduction unit (142)；
Described reference noise modal data storehouse (132) provides a reference noise spectrum NRF (), wherein f is frequency；
Described audio frequency Input transformation is frequency-region signal S (f) by described Fourier transformer (134)；
Described judging unit (136) its compose N according to described frequency-region signal S (f) and described reference noiseRF () judges described audio frequency
Input is in quiet period or speech period；When the input of described audio frequency is in quiet period, start described noise suppression unit (140)；
When the input of described audio frequency is in speech period, start described noise reduction unit (142)；
Described noise suppression unit (140) reduces the amplitude of described frequency-region signal S (f), obtains
Described noise reduction unit (142) deducts described reference noise spectrum N from described frequency-region signal S (f)ROne ratio of (f),
Obtain
Described inverse Fourier transform device (146), it is by described noise suppression unit (140) and/or described noise reduction unit (142)
OutputIt is transformed to a time-domain signal.
2. denoising device as claimed in claim 1, is characterized in that, in described noise suppression unit (140),Decay factor cdIt it is a positive number less than 1.
3. denoising device as claimed in claim 1, is characterized in that, in described noise reduction unit (142),K is a positive number, and w (f) is the normalized weighing factors of a dependent Frequency.
4. denoising device as claimed in claim 1, is characterized in that, described judging unit (136) its believe according to described frequency domain
Number S (f) and described reference noise compose NRDistance Dist between (f) and one first predetermined threshold Threshhold1Judge described sound
Frequency input is in quiet period or speech period, whereinThreshhold1For
One positive number, W is the maximum of f；
If Dist≤Threshhold1, described judging unit (136) judges that the input of described audio frequency is in quiet period；Otherwise, described
Judging unit (136) judges that the input of described audio frequency is in speech period.
5. denoising device as claimed in claim 4, is characterized in that, Threshhold1=5dB.
6. denoising device as claimed in claim 1, is characterized in that, also includes reference noise spectrum updating block (138), when
Described judging unit (136) judges that when the input of described audio frequency is in quiet period, described reference noise spectrum updating block (138) is more
New reference noise spectrum NR(f)。
7. denoising device as claimed in claim 5, is characterized in that, described reference noise spectrum updating block (138) is with following formula
Update reference noise spectrum NR(f): NR(f)=w1(t)*NR(f)+w2(t) * S (f), wherein weight coefficient w1(t) and w2(t) be
Positive number, and w1(t)+w2T ()=1, wherein t is the time.
8. denoising device as claimed in claim 7, is characterized in that,Wherein LSLength for a upper speech period.
9. denoising device as claimed in claim 1, is characterized in that, 2≤K≤3.
10. denoising device as claimed in claim 1, is characterized in that, described noise reduction unit (142) also includes that one is remaining
Noise processed unit (144), described residual noise processing unit (144) judges in N continuous frame audio signal
Continuous frame number M, if M≤threshhod2, thenWherein min () is for going minimum value function, N >=2,
I=-(N-1) ,-(N-2) ..., 0,With-i frame before Fen BieweiingAnd NR(f),
1≤threshhod2≤N。
11. 1 kinds of medical apparatus and instruments, is characterized in that, including the denoising device (126) according to any one of claim 1 to 10.
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