CN110266287A - Cochlear implant fractional delay filter building method, storage medium and cochlear implant - Google Patents
Cochlear implant fractional delay filter building method, storage medium and cochlear implant Download PDFInfo
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- 239000007943 implant Substances 0.000 title claims abstract description 73
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- 238000004364 calculation method Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 2
- 210000003477 cochlea Anatomy 0.000 claims 2
- 238000004590 computer program Methods 0.000 description 12
- 230000006870 function Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
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- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- H—ELECTRICITY
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- H03H17/0018—Realizing a fractional delay
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention belongs to cochlear implant technical field more particularly to a kind of cochlear implant fractional delay filter building method, device, computer readable storage medium and cochlear implants.The method determines the frequency band of the fractional delay filter group of cochlear implant；Each subband is marked off from the frequency band of the fractional delay filter group；Determine the preference score delay filter of each subband respectively, the preference score delay filter of i-th of subband is the fractional delay filter so that when i-th of subband obtains minimal error, and 1≤i≤n, n are number of sub-bands；The preference score delay filter of each subband is combined, the fractional delay filter group of the cochlear implant is constructed.Through the embodiment of the present invention, determine the smallest fractional delay filter of error for each subband respectively first, and then the respective fractional delay filter of these subbands is combined into the fractional delay filter group of Whole frequency band, so that error is minimum on the whole for the fractional delay filter group.
Description
Technical field
The invention belongs to cochlear implant technical field more particularly to a kind of cochlear implant fractional delay filter construction sides
Method, device, computer readable storage medium and cochlear implant.
Background technique
Microphone array technology is derived from sensor array technology, and the array technique of early stage is mainly the thunder for being used in military field
Up to in sonar field, such as aerial array, radar navigation, the application such as underwater sonar.Later sensor array technology is gradually answered
Used in acoustics and voice field and form microphone array technology.In recent years, microphone array technology is vehicle-mounted to exempt from video conference
Phone is mentioned, hearing aid etc. has biggish application；It is begun to appear in cochlear implant front-end collection systematic research recently, uses wheat
Gram wind array speech enhancement technique, carries out enhancing processing to the voice signal of cochlear implant front end.
Microphone array technological core is delay Beamforming Method, and this method is spatially to place multiple Mike's hearsay
Sensor, acquires the voice signal of multichannel, and the delay and weight parameter that the signal for giving corresponding channel is certain, finally combines defeated
(weighting summation or weighted subtraction) out, the output have direction characteristic, there is different responses to the signal of different direction.Prolong
The core parameter of slow Beamforming Method is delay parameter, and the spacing of cochlear implant small volume, front end microphone array cannot
Too big, general spacing is set as 1 centimetre, will lead to fractional delay problem of delay parameter in the case where digital sample in this way,
Conventional fractional delay method precision is not high, or only high in low frequency band precision.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of cochlear implant fractional delay filter building methods, device, meter
Calculation machine readable storage medium storing program for executing and cochlear implant, it is not high to solve existing fractional delay method precision, or only in low frequency frequency
Section problem with high accuracy.
The first aspect of the embodiment of the present invention provides a kind of cochlear implant fractional delay filter building method, can wrap
It includes:
Determine the frequency band of the fractional delay filter group of cochlear implant；
Each subband is marked off from the frequency band of the fractional delay filter group；
The preference score delay filter of each subband is determined respectively, wherein the preference score delay filtering of i-th of subband
Device is the fractional delay filter so that when i-th subband obtains minimal error, and 1≤i≤n, n are to filter from the fractional delay
The number of sub-bands marked off in the frequency band of wave device group；
The preference score delay filter of each subband is combined, the fractional delay filter of the cochlear implant is constructed
Wave device group.
Further, the preference score delay filter for determining each subband respectively includes:
The undetermined coefficient of each subband is calculated separately, the undetermined coefficient is the unit impact of preference score delay filter
Each coefficient in response；
Determine the unit impact of the preference score delay filter of each subband respectively according to the undetermined coefficient of each subband
Response.
Further, the undetermined coefficient for calculating separately each subband includes:
The undetermined coefficient of each subband is calculated separately according to the following formula:
Wherein, τ is delay parameter, and fs is sample rate, ωcen-iFor the center angular frequency of i-th of subband, k is coefficient index,
0≤k≤N, N are the order of fractional delay filter, βk-iFor k-th of the undetermined coefficient namely i-th subband of i-th subband
K-th of coefficient of the unit impact response of preference score delay filter.
Further, the undetermined coefficient according to each subband determines the preference score delay filtering of each subband respectively
The unit impact response of device includes:
Determine the unit impact response of the preference score delay filter of each subband respectively according to the following formula:
hi(n)=[β0-i,β1-i,β2-i,…,βN-i]
Wherein, hiIt (n) is the unit impact response of the preference score delay filter of i-th of subband.
The second aspect of the embodiment of the present invention provides a kind of cochlear implant fractional delay filter constructing apparatus, can wrap
It includes:
Band determination module, the frequency band of the fractional delay filter group for determining cochlear implant；
Sub-band division module, for marking off each subband from the frequency band of the fractional delay filter group；
Filter determining module, for determining the preference score delay filter of each subband respectively, wherein i-th of son
The preference score delay filter of band is the fractional delay filter so that when i-th subband obtains minimal error, 1≤i≤n, n
For the number of sub-bands marked off from the frequency band of the fractional delay filter group；
Filter group constructing module constructs institute for the preference score delay filter of each subband to be combined
State the fractional delay filter group of cochlear implant.
Further, the filter determining module may include:
Coefficient calculation unit, for calculating separately the undetermined coefficient of each subband, the undetermined coefficient is prolonged for preference score
Each coefficient in the unit impact response of slow filter；
Unit impact response determination unit, for determining the preferred of each subband respectively according to the undetermined coefficient of each subband
The unit impact response of fractional delay filter.
Further, the coefficient calculation unit is specifically used for calculating separately the undetermined coefficient of each subband according to the following formula:
Wherein, τ is delay parameter, and fs is sample rate, ωcen-iFor the center angular frequency of i-th of subband, k is coefficient index,
0≤k≤N, N are the order of fractional delay filter, βk-iFor k-th of the undetermined coefficient namely i-th subband of i-th subband
K-th of coefficient of the unit impact response of preference score delay filter.
Further, the unit impact response determination unit is specifically used for determining the excellent of each subband respectively according to the following formula
Select the unit impact response of fractional delay filter:
hi(n)=[β0-i,β1-i,β2-i,…,βN-i]
Wherein, hiIt (n) is the unit impact response of the preference score delay filter of i-th of subband.
The third aspect of the embodiment of the present invention provides a kind of computer readable storage medium, the computer-readable storage
Media storage has computer-readable instruction, and the computer-readable instruction realizes any of the above-described kind of electronic ear when being executed by processor
The step of snail fractional delay filter building method.
The fourth aspect of the embodiment of the present invention provides a kind of cochlear implant, including memory, processor and is stored in
In the memory and the computer-readable instruction that can run on the processor, the processor executes the computer can
The step of any of the above-described kind of cochlear implant fractional delay filter building method is realized when reading instruction.
Existing beneficial effect is the embodiment of the present invention compared with prior art: the embodiment of the present invention determines cochlear implant
The frequency band of fractional delay filter group；Each subband is marked off from the frequency band of the fractional delay filter group；It determines respectively
The preference score delay filter of each subband, wherein the preference score delay filter of i-th of subband is so that i-th of son
Fractional delay filter when with acquirement minimal error, 1≤i≤n, n are to draw from the frequency band of the fractional delay filter group
The number of sub-bands separated；The preference score delay filter of each subband is combined, point of the cochlear implant is constructed
Number delay filter group.Through the embodiment of the present invention, determine that the smallest score of error prolongs for each subband respectively first
Slow filter, and then the respective fractional delay filter of these subbands is combined into the fractional delay filter group of Whole frequency band, make
Obtaining the fractional delay filter group, error is minimum on the whole.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of one embodiment process of cochlear implant fractional delay filter building method in the embodiment of the present invention
Figure；
Fig. 2 is the schematic diagram of a specific example；
Fig. 3 is a kind of one embodiment structure of cochlear implant fractional delay filter constructing apparatus in the embodiment of the present invention
Figure；
Fig. 4 is a kind of schematic block diagram of cochlear implant in the embodiment of the present invention.
Specific embodiment
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, a kind of implementation of cochlear implant fractional delay filter building method in the embodiment of the present invention
Example may include:
Step S101, the frequency band of the fractional delay filter group of cochlear implant is determined.
The frequency band of the fractional delay filter group can be configured according to the actual situation, and the present embodiment does not make this to have
Body limits.For example, [152 7769] can be set to, i.e., frequency range is from 152Hz to 7769Hz.
Step S102, each subband is marked off from the frequency band of the fractional delay filter group.
Specific sub-band division mode can be configured according to the actual situation, and the present embodiment is not especially limited this.
For example, being divided according to 24 sub- bands, then if the frequency band of the fractional delay filter group is [152 7769]
These subbands can be respectively as follows: [152 274], [274 396], [396 517], [517 639], [639 761], [761
883]、[883 1005]、[1005 1127]、[1127 1249]、[1249 1432]、[1432 1614]、 [1614 1797]、
[1797 2041]、[2041 2346]、[2346 2650]、[2650 2955]、[2955 3321]、 [3321 3747]、
[3747 4235]、[4235 4783]、[4783 5392]、[5392 6124]、[6214 6916]、 [6916 7769]。
Step S103, the preference score delay filter of each subband is determined respectively.
Wherein, the preference score delay filter of i-th of subband is the score so that when i-th subband obtains minimal error
Delay filter, 1≤i≤n, n are the number of sub-bands marked off from the frequency band of the fractional delay filter group.
The original signal that the cochlear implant receives can be decomposed into the sum of the subband signal of each subband, such as following formula institute
Show:
Wherein, x (n) is the original signal, xiIt (n) is the subband signal of i-th of subband.
It, then can be further by the subband of the original signal and each subband in view of that can have delay in practical application
The relationship of signal is expressed as:
Wherein, τ is delay parameter, and fs is sample rate, τ fsThe as corresponding delay sampling points of delay parameter.
For the parameter of practical application, delay sampling points τ fsNot necessarily integer, it can be split as one it is whole
Number delay DiWith a fractional delays Dd, it is shown below:
τfs=Di+Dd(0≤Dd≤1)
Work as DdWhen being 0, postpone τ fsIt is reduced to the delay of integral point, realization is simple, the only shifting of digital signal
Position.And work as DdWhen not being 0, postpone τ fsEssence is to carry out interpolation between each sampled point of known signal x (n).
It being divided since frequency band has been carried out in the language processing strategy of cochlear implant itself, each subband is narrow band signal,
Frequency band is different, and the coefficient of corresponding fractional delay filter is also different.
In the present embodiment, the undetermined coefficient of each subband can be calculated separately according to the following formula first:
Wherein, the undetermined coefficient is each coefficient in the unit impact response of preference score delay filter, ωcen-i
For the center angular frequency of i-th of subband, k is coefficient index, and 0≤k≤N, N are the order of fractional delay filter, βk-iIt is i-th
K-th of the unit impact response of the preference score delay filter of k-th of undetermined coefficient of a subband namely i-th of subband
Coefficient.
It is then possible to determine the preference score delay filter of each subband respectively according to the undetermined coefficient of each subband
Unit impact response, it may be assumed that
hi(n)=[β0-i,β1-i,β2-i,…,βN-i]
Wherein, hiIt (n) is the unit impact response of the preference score delay filter of i-th of subband.
It, can be by substituting into delay values ri and corresponding frequency band for required delay parameter in cochlear implant practical application
Center angular frequency ωcen-iCome the coefficient of N rank fractional delay filter required for calculating, error is a small amount of o (Δs of high-order
ωN), while after the division of cochlear implant frequency band, each frequency band is narrow band signal, and Δ ω value is smaller, therefore the score of each subband
Delay error is smaller.
Step S104, the preference score delay filter of each subband is combined, constructs the cochlear implant
Fractional delay filter group.
For the cochlear implant of different port numbers (each subband is a channel), the width of fractional delay filter
Frequency response curve is also different, still by taking the cochlear implant in above-mentioned 24 channel as an example, the centre frequency in 24 channels is respectively as follows: 213,
335、456.5、578、700、822、944、1066、1188、1340.5、 1523、1705.5、1919、2193.5、2498、
2802.5,3138,3534,3991,4509,5087.5,5758,6520,7342.5 (the above unit is Hz), if setting fs
=22.05, and τ fs=0.7, then the amplitude-frequency response of its 3 rank fractional delay filter can be calculated such as according to the above method
Shown in Fig. 2.
The frequency band in the channel 1~24 in Fig. 2 is sequentially increased, wherein the centre frequency in channel 1 is 213Hz, in channel 24
Frequency of heart is 7342.5Hz.Ideal fractional delay filter is the all-pass system with linear phase, system amplitude-frequency response
Perseverance is 1, and therefore, for the system amplitude-frequency response of the fractional delay filter constructed closer to 1, accuracy is higher.From figure
The shape of the amplitude-frequency response of the fractional delay filter of 24 frequency bands can see, and when frequency is lower, amplitude-frequency response is bent
Line approaches 1 in low frequency position, and when frequency is gradually increased, the position that amplitude-frequency response approaches 1 is gradually by low frequency variations
Intermediate frequency and the position for further tending to high frequency.It is above-mentioned since each frequency band of cochlear implant is containing only the narrow band signal of corresponding frequency band
Designed fractional delay filter then realizes the amplitude-frequency response on corresponding frequency band and approaches ideal fractional delay filter
The characteristic of device, and filter deviates the fractional delay that 1 does not influence place frequency range then in the system amplitude-frequency response value of other positions
Precision.
Since each subband in cochlear implant filter group is narrow band signal, the system amplitude-frequency of fractional delay filter
The part curve of frequency band where the live part of response curve is only limitted to.
In conclusion the embodiment of the present invention determines the frequency band of the fractional delay filter group of cochlear implant；From the score
Each subband is marked off in the frequency band of delay filter group；The preference score delay filter of each subband is determined respectively, wherein
The preference score delay filter of i-th of subband is the fractional delay filter so that when i-th subband obtains minimal error, 1
≤ i≤n, n are the number of sub-bands marked off from the frequency band of the fractional delay filter group；By the preference score of each subband
Delay filter is combined, and constructs the fractional delay filter group of the cochlear implant.Through the embodiment of the present invention, first
Determine the smallest fractional delay filter of error for each subband respectively, and then by the respective fractional delay of these subbands
Filter bank at Whole frequency band fractional delay filter group so that error is minimum on the whole for the fractional delay filter group.
It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process
Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present invention constitutes any limit
It is fixed.
Corresponding to a kind of cochlear implant fractional delay filter building method described in foregoing embodiments, Fig. 3 shows this
A kind of one embodiment structure chart for cochlear implant fractional delay filter constructing apparatus that inventive embodiments provide.
In the present embodiment, a kind of cochlear implant fractional delay filter constructing apparatus may include:
Band determination module 301, the frequency band of the fractional delay filter group for determining cochlear implant；
Sub-band division module 302, for marking off each subband from the frequency band of the fractional delay filter group；
Filter determining module 303, for determining the preference score delay filter of each subband respectively, wherein i-th
The preference score delay filter of subband is the fractional delay filter so that when i-th subband obtains minimal error, 1≤i≤
N, n are the number of sub-bands marked off from the frequency band of the fractional delay filter group；
Filter group constructing module 304 is constructed for the preference score delay filter of each subband to be combined
The fractional delay filter group of the cochlear implant.
Further, above-mentioned filter determining module may include:
Coefficient calculation unit, for calculating separately the undetermined coefficient of each subband, the undetermined coefficient is prolonged for preference score
Each coefficient in the unit impact response of slow filter；
Unit impact response determination unit, for determining the preferred of each subband respectively according to the undetermined coefficient of each subband
The unit impact response of fractional delay filter.
Further, the coefficient calculation unit is specifically used for calculating separately the undetermined coefficient of each subband according to the following formula:
Wherein, τ is delay parameter, and fs is sample rate, ωcen-iFor the center angular frequency of i-th of subband, k is coefficient index,
0≤k≤N, N are the order of fractional delay filter, βk-iFor k-th of the undetermined coefficient namely i-th subband of i-th subband
K-th of coefficient of the unit impact response of preference score delay filter.
Further, the unit impact response determination unit is specifically used for determining the excellent of each subband respectively according to the following formula
Select the unit impact response of fractional delay filter:
hi(n)=[β0-i,β1-i,β2-i,…,βN-i]
Wherein, hiIt (n) is the unit impact response of the preference score delay filter of i-th of subband.
It is apparent to those skilled in the art that for convenience and simplicity of description, the device of foregoing description,
The specific work process of module and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
The schematic block diagram that Fig. 4 shows a kind of cochlear implant provided in an embodiment of the present invention is only shown for ease of description
Part related to the embodiment of the present invention.
As shown in figure 4, the cochlear implant 4 of the embodiment includes: processor 40, memory 41 and is stored in the storage
In device 41 and the computer program 42 that can be run on the processor 40.The processor 40 executes the computer program 42
Step in the above-mentioned each cochlear implant fractional delay filter building method embodiment of Shi Shixian, such as step shown in FIG. 1
S101 to step S104.Alternatively, the processor 40 is realized when executing the computer program 42 in above-mentioned each Installation practice
The function of each module/unit, such as module 301 shown in Fig. 3 is to the function of module 304.
Illustratively, the computer program 42 can be divided into one or more module/units, it is one or
Multiple module/units are stored in the memory 41, and are executed by the processor 40, to complete the present invention.Described one
A or multiple module/units can be the series of computation machine program instruction section that can complete specific function, which is used for
Implementation procedure of the computer program 42 in the cochlear implant 4 is described.
It will be understood by those skilled in the art that Fig. 4 is only the example of cochlear implant 4, do not constitute to cochlear implant 4
It limits, may include perhaps combining certain components or different components, such as described than illustrating more or fewer components
Cochlear implant 4 can also include input-output equipment, network access equipment, bus etc..
The processor 40 can be central processing unit (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor
Deng.
The memory 41 can be the internal storage unit of the cochlear implant 4, for example, cochlear implant 4 hard disk or
Memory.The memory 41 is also possible to the External memory equipment of the cochlear implant 4, such as is equipped on the cochlear implant 4
Plug-in type hard disk, intelligent memory card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card,
Flash card (Flash Card) etc..Further, the memory 41 can also both include the storage inside of the cochlear implant 4
Unit also includes External memory equipment.The memory 41 is for storing 4 institute of the computer program and the cochlear implant
The other programs and data needed.The memory 41 can be also used for temporarily storing the number that has exported or will export
According to.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function
Can unit, module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device is divided into different functional unit or module, more than completing
The all or part of function of description.Each functional unit in embodiment, module can integrate in one processing unit, can also
To be that each unit physically exists alone, can also be integrated in one unit with two or more units, it is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.In addition, each function list
Member, the specific name of module are also only for convenience of distinguishing each other, the protection scope being not intended to limit this application.Above system
The specific work process of middle unit, module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed device/cochlear implant and method, it can be with
It realizes by another way.For example, device described above/cochlear implant embodiment is only schematical, for example, institute
The division of module or unit is stated, only a kind of logical function partition, there may be another division manner in actual implementation, such as
Multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.Separately
A bit, shown or discussed mutual coupling or direct-coupling or communication connection can be through some interfaces, device
Or the INDIRECT COUPLING or communication connection of unit, it can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated module/unit be realized in the form of SFU software functional unit and as independent product sale or
In use, can store in a computer readable storage medium.Based on this understanding, the present invention realizes above-mentioned implementation
All or part of the process in example method, can also instruct relevant hardware to complete, the meter by computer program
Calculation machine program can be stored in a computer readable storage medium, the computer program when being executed by processor, it can be achieved that on
The step of stating each embodiment of the method.Wherein, the computer program includes computer program code, the computer program generation
Code can be source code form, object identification code form, executable file or certain intermediate forms etc..The computer-readable medium
It may include: any entity or device, recording medium, USB flash disk, mobile hard disk, magnetic that can carry the computer program code
Dish, CD, computer storage, read-only memory (ROM, Read-Only Memory), random access memory (RAM,
Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It should be noted that described
The content that computer-readable medium includes can carry out increasing appropriate according to the requirement made laws in jurisdiction with patent practice
Subtract, such as does not include electric carrier signal and electricity according to legislation and patent practice, computer-readable medium in certain jurisdictions
Believe signal.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of cochlear implant fractional delay filter building method characterized by comprising
Determine the frequency band of the fractional delay filter group of cochlear implant；
Each subband is marked off from the frequency band of the fractional delay filter group；
The preference score delay filter of each subband is determined respectively, wherein the preference score delay filter of i-th of subband is
So that fractional delay filter when i-th of subband acquirement minimal error, 1≤i≤n, n are from the fractional delay filter group
Frequency band in the number of sub-bands that marks off；
The preference score delay filter of each subband is combined, the fractional delay filter of the cochlear implant is constructed
Group.
2. cochlear implant fractional delay filter building method according to claim 1, which is characterized in that the difference is true
The preference score delay filter of each subband includes: calmly
The undetermined coefficient of each subband is calculated separately, the undetermined coefficient is the unit impact response of preference score delay filter
In each coefficient；
Determine the unit impact response of the preference score delay filter of each subband respectively according to the undetermined coefficient of each subband.
3. cochlear implant fractional delay filter building method according to claim 2, which is characterized in that described to count respectively
The undetermined coefficient for calculating each subband includes:
The undetermined coefficient of each subband is calculated separately according to the following formula:
Wherein, τ is delay parameter, and fs is sample rate, ωcen-iFor the center angular frequency of i-th of subband, k is coefficient index, 0≤k
≤ N, N are the order of fractional delay filter, βk-iFor i-th subband k-th of undetermined coefficient namely i-th subband it is preferred
K-th of coefficient of the unit impact response of fractional delay filter.
4. cochlear implant fractional delay filter building method according to claim 3, which is characterized in that the basis is each
The undetermined coefficient of a subband determines that the unit impact response of the preference score delay filter of each subband includes: respectively
Determine the unit impact response of the preference score delay filter of each subband respectively according to the following formula:
hi(n)=[β0-i,β1-i,β2-i,…,βN-i]
Wherein, hiIt (n) is the unit impact response of the preference score delay filter of i-th of subband.
5. a kind of cochlear implant fractional delay filter constructing apparatus characterized by comprising
Band determination module, the frequency band of the fractional delay filter group for determining cochlear implant；
Sub-band division module, for marking off each subband from the frequency band of the fractional delay filter group；
Filter determining module, for determining the preference score delay filter of each subband respectively, wherein i-th subband
Preference score delay filter is the fractional delay filter so that when i-th subband obtains minimal error, 1≤i≤n, n be from
The number of sub-bands marked off in the frequency band of the fractional delay filter group；
Filter group constructing module constructs the electricity for the preference score delay filter of each subband to be combined
The fractional delay filter group of sub- cochlea.
6. device according to claim 5, which is characterized in that the filter determining module may include:
Coefficient calculation unit, for calculating separately the undetermined coefficient of each subband, the undetermined coefficient is preference score delay filter
Each coefficient in the unit impact response of wave device；
Unit impact response determination unit, for determining the preference score of each subband respectively according to the undetermined coefficient of each subband
The unit impact response of delay filter.
7. device according to claim 6, which is characterized in that the coefficient calculation unit is specifically used for distinguishing according to the following formula
Calculate the undetermined coefficient of each subband:
Wherein, τ is delay parameter, and fs is sample rate, ωcen-iFor the center angular frequency of i-th of subband, k is coefficient index, 0≤k
≤ N, N are the order of fractional delay filter, βk-iFor i-th subband k-th of undetermined coefficient namely i-th subband it is preferred
K-th of coefficient of the unit impact response of fractional delay filter.
8. device according to claim 7, which is characterized in that the unit impact response determination unit is specifically used for basis
Following formula determines the unit impact response of the preference score delay filter of each subband respectively:
hi(n)=[β0-i,β1-i,β2-i,…,βN-i]
Wherein, hiIt (n) is the unit impact response of the preference score delay filter of i-th of subband.
9. a kind of computer readable storage medium, the computer-readable recording medium storage has computer-readable instruction, special
Sign is, the electronics as described in any one of claim 1 to 4 is realized when the computer-readable instruction is executed by processor
The step of cochlea fractional delay filter building method.
10. a kind of cochlear implant, including memory, processor and storage are in the memory and can be on the processor
The computer-readable instruction of operation, which is characterized in that the processor realizes such as right when executing the computer-readable instruction
It is required that described in any one of 1 to 4 the step of cochlear implant fractional delay filter building method.
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