CN109862470A - To method, earphone and its computer readable storage medium of otopathy patient broadcast - Google Patents
To method, earphone and its computer readable storage medium of otopathy patient broadcast Download PDFInfo
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- CN109862470A CN109862470A CN201811603189.8A CN201811603189A CN109862470A CN 109862470 A CN109862470 A CN 109862470A CN 201811603189 A CN201811603189 A CN 201811603189A CN 109862470 A CN109862470 A CN 109862470A
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Abstract
The present invention relates to speaker technology fields, in particular to a kind of earphone, earphone is equipped with sequentially connected microphone, processor and loudspeaker, computer readable storage medium is stored in earphone, computer program in the computer readable storage medium realizes a kind of couple of otopathy patient broadcast method when being run by the processor, this method can compress the insensitive frequency range of audio middle ear patient or eliminate, to show the audio of other frequency ranges, so otopathy patient can be enable more clearly to listen to audio, otopathy patient is avoided to feel in audio there is " blank spot " because of insensitive band interference, therefore the audition experience of otopathy patient can be improved.
Description
Technical field
The present invention relates to speaker technology field, in particular to a kind of earphone has computer readable storage medium, Jie thereon
Matter is stored with computer program, which realizes the method that a kind of couple of otopathy patient broadcasts when being run by the processor in earphone.
Background technique
The workers with long time of part work post is currently, there are by its working environment noise effect, hearing gradually declines, and becomes ear
Patient (also known as hearing inconvenience crowd), such otopathy patient can often encounter the syllable for being difficult to not hear, feel sound in audition
There is " blank spot " in frequency, audition experience is bad, whereby, to research and develop a kind of side to broadcast specifically for otopathy patient
Method looks after the demand of the group to improve the audition experience of such specific group.
Summary of the invention
It is an object of the invention to improve the experience of the audition of otopathy patient, audio can be clearly listened to.
Applicant it has been investigated that: why otopathy patient can encounter the syllable for being difficult to not hear in audition, be due to it
For a long time working environment noise it is noisy under, ear becomes insensitive to the audio of frequency range where working environment noise, such as long-term
The person of mining for coal can be insensitive to generated noise frequency range of mining, therefore such otopathy patient is in audition, it tends to be difficult to not hear it not
The audio of sensitive frequency range, in the case that, if at a time when will lead to when the energy of the insensitive frequency range occupies major part in total frequency range
Otopathy patient is difficult to not hear the syllable at the moment, and applicant expects the method for a kind of couple of otopathy patient broadcast whereby, including to sound
The broadcast step that frequency plays out；It further include the band shifting step executed before the step that broadcasts, wherein band shifting step
It compresses or eliminates for the insensitive frequency range to audio middle ear patient.
Wherein, band shifting step system compresses the insensitive frequency range in audio.
Wherein, the mode of the compression is to reduce the audio total amount of the insensitive frequency range in a frequency domain.
Wherein, the insensitive frequency range is known as original frequency range, numberical range fil~fiu；It is described to subtract in a frequency domain
The mode of few audio total amount is original frequency range fil~fiuIn audio compression to target frequency bands fol~fouIn the middle, wherein fil≤
fol< fou≤fiu。
Wherein, the filWith folIt is equal, the fiuFor infinity；Original frequency range fil~fiuIn audio compression arrive
Target frequency bands fol~fouDuring, give up frequency range fou~fiuBetween audio.
Wherein, according toCarry out the compression, formula
In, filFor the lower-frequency limit that need to convert original frequency range；folFor the lower-frequency limit of target frequency bands after transformation；fouFor target after transformation
The upper frequency limit of frequency range；P is variation coefficient.
Wherein, according to p=(fiu-fil)/(fou-fol) obtain the variation coefficient p, in formula, folFor target frequency after transformation
The lower-frequency limit of section.
Wherein, before audio being transformed to frequency domain, windowing process first is carried out to audio.
Wherein, further include audio obtaining step, external audio is picked up by the microphone of earphone；In the step that broadcasts, institute
Stating to the concrete mode that audio plays out is played out with the loudspeaker of earphone.
It also proposes a kind of computer readable storage medium, is stored with computer program, when which is run by processor
Realize above-mentioned method.
A kind of earphone, including sequentially connected microphone, processor and loudspeaker are also provided, further include above-mentioned computer
Readable storage medium storing program for executing, the computer program in the computer readable storage medium are run by the processor.
Beneficial effects of the present invention:
Earphone of the invention is equipped with sequentially connected microphone, processor and loudspeaker, and being stored with computer in earphone can
Reading storage medium can be audio middle ear when the computer program in the computer readable storage medium is run by the processor
The insensitive frequency range compression of patient eliminates, and to show the audio of other frequency ranges, so can enable otopathy patient more
Audio is clearly listened to, avoids otopathy patient from feeling in audio there is " blank spot " because of insensitive band interference, therefore can mention
The audition of high otopathy patient is experienced.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings, but the embodiment in attached drawing is not constituted to any limit of the invention
System, for those of ordinary skill in the art, without creative efforts, can also obtain according to the following drawings
Other attached drawings.
Fig. 1 is the flow chart of audio playback method.
Fig. 2 is that echo is uttered long and high-pitched sounds the flow chart of removal process.
Fig. 3 is the flow chart of noise suppressed step.
Fig. 4 is the flow chart that frequency remolds step.
Fig. 5 is the schematic diagram of spectral contrast before and after frequency transformation.
Specific embodiment
The invention will be further described with the following Examples.
See Fig. 1, in the earphone of the present embodiment, microphone picks up external audio signal, and the audio signal picked up is premenstrual
It sets after power amplifier amplifies and force down useless noise signal, amplified audio signal is made of high pass and low-pass filter anti-
Aliasing pre-filtering processing reduces influence of the noise to efficient voice signal, then use to filter out the noise other than designated frequency range
A/D conversion module, which changes into after digital quantity, to be sent into processor (can be ARM, DSP or other MCU), processor with it is computer-readable
Storage medium connects, and computer program is stored in the medium, and program can be run by processor.Handle when processor runs the program
Audio signal carry out playback process, audio signal that treated after D/A is converted, through audio signal signal output module export to
Loudspeaker, to broadcast to otopathy patient.Wherein, the audio signal back method that processor operation program is realized is specific as follows
The step of text is recorded.
S1. echo is uttered long and high-pitched sounds removal process
Some leakage, reaches microphone, becomes input signal, if do not filtered out, just in the audio of loudspeaker output
It will form and utter long and high-pitched sounds.See Fig. 2, writes algorithm filter with Normalized LMS Algorithm, so that establishing filtering estimates feedback path w (n),
The audio signal u (n) that previous moment is exported to loudspeaker estimates feedback path w (n) phase convolution with filtering, obtains making a whistling sound to echo
It makes the filtering simulated estimate feedback signal v (n), the feedback microphone signal of v (n) from current time then is estimated into filtering
Removal in d (n) obtains echo and utters long and high-pitched sounds the signal e (n) after eliminating.
S2. noise suppressed step
See Fig. 3, echo is uttered long and high-pitched sounds after elimination, reduces the noise jamming in signal e (n) by this step, improves band and makes an uproar letter
The signal-to-noise ratio of number e (n) and can identification.Noise estimation is carried out to signals with noise e (n) first, i.e., e (n) is split into x (n), s
(n) two parts obtain following formula (1).
E (n)=x (n)+s (n) is (1)
In formula, e (n) is noisy speech；
X (n) is the target voice in noisy speech；
S (n) is the noise in noisy speech.
There to be E (ω)=X (ω)+S (ω) after formula (1) Fourier transformation, wherein noise S (ω) is between speech pause
E (ω), S (ω) are then substituted into following formula (2) by gap or the audio that microphone is picked up in no voice respectively, thus
Signal X (ω) after obtaining noise suppressed, and then obtain x (n).
In formula, eiφ(ω)For the phase spectrum of noisy speech e (n).
S3. loudness compensation step
This step is used to carry out loudness adjustment to x (n) specifically to can be Linear Amplifer, to the signal of different sound pressure levels
Carry out same degree amplification；Nonlinear amplification can also be used, the signal of low sound pressure levels is largely amplified, to height
The signal of sound pressure level carries out lesser degree of amplification, does not amplify or inhibit.
S4. frequency remolds step
Since otopathy patient can be insensitive to the frequency range where common noise in its working environment, the person that for a long time do not mine for coal such as is to adopting
Noise frequency range caused by coal is insensitive, therefore the insensitive frequency range of audio middle ear patient need to be compressed even by this step
It eliminates, to show the audio of other frequency ranges, so otopathy patient can be enable more clearly to listen to audio, otopathy is avoided to suffer from
Person feels in audio there is " blank spot " because of insensitive band interference.Herein it should be noted that, 1, otopathy patient it is unwise
Sense frequency range is different because of work, living environment difference；2, the audio that human ear is heard is by multiband audio frequency component common combination
It forms, therefore compression even is eliminated part of frequency range and audio can't be made to disappear, can only change its tone color.
This step specific implementation process is as shown in Figure 4, comprising:
S4-1. parameter setting step
Its insensitive frequency range is determined according to otopathy patient, and for convenience of stating, insensitive frequency range is hereafter known as original frequency range,
Numerical value is fil~fiu.It sets the compressed target frequency bands of original frequency range as fol~fou, variation coefficient p, range-adjusting coefficient
For k, wherein p, k can be a constant constant, be also possible to the variable of one group of variation；Typically, p=(f can be setiu-
fil)/(fou-fol)。
S4-2. adding window step
Due to needing to carry out Fast Fourier Transform (FFT) (FFT) to x (n), the analysis spectrum of digital signal is obtained, in order to reduce
Spectrum leakage, need to be to converting again after signal adding window.Specifically, x (n) is carried out windowing process, is formed adding window voice signal Sw (n)
=x (n) * w (n), wherein window function w (n) can be peaceful (Hanning) window or other of rectangular window, Hamming (Hamming) window, the Chinese
Suitable window type.
S4-3. Fourier transformation step
FFT variation is carried out to adding window voice signal Sw (n), signal is transformed into frequency domain from time domain, is obtained frequency spectrum X (f).
S4-4. band shifting step
New frequency spectrum X ' (f) is converted to obtain according to following formula (3), wherein formula (3) is as follows.
In formula, filFor the lower-frequency limit that need to convert original frequency range；
fiuFor the upper frequency limit that need to convert original frequency range；
folFor the lower-frequency limit of target frequency bands after transformation；
fouFor the upper frequency limit of target frequency bands after transformation；
P is variation coefficient.
The meaning of formula (3) is to see Fig. 5, if output frequency < f of audiool, then output spectrum and input, do not do and become
It changes；If the output frequency of audio is in fol-fouBetween, frequency spectrum is converted by formula, its significance lies in that by fol-fouBetween audio pressure
Contracting rear left moves to and 0-folBetween audio linking；If output frequency > f of audioou, then directly eliminated.
S4-5. gain step
This step is not preferred step, for carrying out amplitude gain to compressed audio.
S4-6. Fourier inversion step
IFFT change is carried out to X ' (f), frequency-region signal is transformed into time-domain audio signal, and then after acquisition frequency remodeling
x(n)。
S5. gain rate-determining steps
This step is used to detect the intensity of audio data section, and automatically to being determined as that the big data segment of intensity cuts down,
To being determined as that the small data segment of intensity enhances, specifically, a frame number strong point is obtained by certain length, calculates the frame amplitude
Characteristic value A is set amplitude characteristic value limit L (limit L can be divided into bound or multiple gears according to actual needs), then will
Amplitude characteristic value A is compared with each setting limit L, gain coefficient G=f (A, L), then by the frame primary data and gain
Coefficient G is multiplied, and obtains final audio signal to be output.
It should be noted that step mentioned by the above S1-S5, can carry out multinomial merging, its sequence also can be changed, also visually
Actual demand is increased and decreased.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of range is protected, although explaining in detail referring to preferred embodiment to the present invention, those skilled in the art are answered
Work as understanding, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the reality of technical solution of the present invention
Matter and range.
Claims (10)
1. the method for pair otopathy patient broadcast, including broadcast step, play out audio；It is characterized in that further including broadcasting
The band shifting step executed before step, compresses or eliminates to the insensitive frequency range of audio middle ear patient.
2. as described in claim 1 to the method for otopathy patient broadcast, it is characterized in that: band shifting step system is in audio
The insensitive frequency range is compressed.
3. as claimed in claim 2 to the method for otopathy patient broadcast, it is characterized in that: the mode of the compression is in a frequency domain
Reduce the audio total amount of the insensitive frequency range.
4. as claimed in claim 3 to the method for otopathy patient broadcast, it is characterized in that: the insensitive frequency range is referred to as original
Frequency range, numberical range fil~fiu；The mode for reducing audio total amount in a frequency domain is original frequency range fil~fiuIn
Audio compression is to target frequency bands fol~fouIn the middle, wherein fil≤fol< fou≤fiu。
5. as claimed in claim 4 to the method for otopathy patient broadcast, it is characterized in that: the filWith folIt is equal, the fiuFor
It is infinitely great；Original frequency range fil~fiuIn audio compression to target frequency bands fol~fouDuring, give up frequency range fou~
fiuBetween audio.
6. as claimed in claim 5 to the method for otopathy patient broadcast, it is characterized in that:
According toCarry out the compression, in formula, filTo need to become
Change the lower-frequency limit of original frequency range；folFor the lower-frequency limit of target frequency bands after transformation；fouIn frequency for target frequency bands after transformation
Limit；P is variation coefficient.
7. as claimed in claim 6 to the method for otopathy patient broadcast, it is characterized in that: according to p=(fiu-fil)/(fou-fol)
Obtain the variation coefficient p, in formula, folFor the lower-frequency limit of target frequency bands after transformation.
8., it is characterized in that: further including audio obtaining step, leading to as described in claim 1 to the method for otopathy patient broadcast
The microphone for crossing earphone picks up external audio；In the step that broadcasts, the concrete mode earphone that audio is played out
Loudspeaker plays out.
9. computer readable storage medium is stored with computer program, realized such as when which is run by processor
Method according to any one of claims 1 to 8 to otopathy patient broadcast.
10. earphone, including sequentially connected microphone, processor and loudspeaker, it is characterized in that further including as claimed in claim 9
Computer readable storage medium, the computer program in the computer readable storage medium run by the processor.
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