CN110266287B - Method for constructing fractional delay filter of electronic cochlea, storage medium and electronic cochlea - Google Patents

Method for constructing fractional delay filter of electronic cochlea, storage medium and electronic cochlea Download PDF

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CN110266287B
CN110266287B CN201910368253.7A CN201910368253A CN110266287B CN 110266287 B CN110266287 B CN 110266287B CN 201910368253 A CN201910368253 A CN 201910368253A CN 110266287 B CN110266287 B CN 110266287B
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陈又圣
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Abstract

The invention belongs to the technical field of electronic cochlea, and particularly relates to a method and a device for constructing a fractional delay filter of an electronic cochlea, a computer-readable storage medium and the electronic cochlea. The method determines a frequency band of a fractional delay filter bank of the electronic cochlea; dividing each sub-band from the frequency band of the fractional delay filter bank; determining the preferred fractional delay filter of each sub-band, wherein the preferred fractional delay filter of the ith sub-band is the fractional delay filter when the ith sub-band obtains the minimum error, i is more than or equal to 1 and less than or equal to n, and n is the number of sub-bands; and combining the preferred fractional delay filters of the sub-bands to construct the fractional delay filter bank of the electronic cochlea. According to the embodiment of the invention, the fractional delay filter with the minimum error for each sub-band is firstly determined respectively, and then the respective fractional delay filters of the sub-bands are combined into the fractional delay filter group of the full frequency band, so that the error of the fractional delay filter group is minimum in the whole.

Description

Method for constructing fractional delay filter of electronic cochlea, storage medium and electronic cochlea
Technical Field
The invention belongs to the technical field of electronic cochlea, and particularly relates to a method and a device for constructing a fractional delay filter of an electronic cochlea, a computer-readable storage medium and the electronic cochlea.
Background
Microphone array technology is derived from sensor array technology, and early array technology is mainly used in the radar and sonar fields of military fields, such as antenna arrays, radar navigation, underwater sonar and other applications. Sensor array technology is increasingly being applied in the acoustic and speech fields and forms microphone array technology. In recent years, microphone array technology has been widely used in video conferences, car hands-free telephones, hearing aids, and the like; recently, in the research of the electronic cochlea front-end acquisition system, a microphone array voice enhancement technology is used for enhancing a voice signal at the front end of the electronic cochlea.
The core of the microphone array technology is a delay beam forming method, which is to place a plurality of microphone sensors in space, collect the sound signals of multiple channels, give certain delay and weight parameters to the signals of the corresponding channels, and finally combine the outputs (weighted addition or weighted subtraction), wherein the outputs have directivity characteristics and have different responses to the signals of different directions. The core parameter of the delay beam forming method is a delay parameter, the volume of an electronic cochlea is smaller, the distance between front-end microphone arrays cannot be too large, and the distance is generally set to be 1 cm, so that the problem of fractional delay of the delay parameter under the condition of digital sampling can be caused, and the conventional fractional delay method is low in precision or high in precision only in a low-frequency band.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a method and apparatus for constructing a fractional delay filter of an electronic cochlea, a computer readable storage medium, and an electronic cochlea, so as to solve the problem that the existing fractional delay method is not high in precision or is high in precision only in a low-frequency band.
A first aspect of an embodiment of the present invention provides a method for constructing a fractional delay filter of an electronic cochlea, which may include:
determining a frequency band of a fractional delay filter bank of the electronic cochlea;
dividing each sub-band from the frequency band of the fractional delay filter bank;
determining a preferred fractional delay filter of each sub-band, wherein the preferred fractional delay filter of the ith sub-band is a fractional delay filter when the ith sub-band obtains the minimum error, i is more than or equal to 1 and less than or equal to n, and n is the number of sub-bands divided from the frequency band of the fractional delay filter bank;
and combining the preferred fractional delay filters of the sub-bands to construct the fractional delay filter bank of the electronic cochlea.
Further, the determining the preferred fractional delay filter for each subband separately includes:
calculating undetermined coefficients of all sub-bands respectively, wherein the undetermined coefficients are all coefficients in unit impulse response of a preferential fractional delay filter;
the unit impulse response of the preferred fractional delay filter for each sub-band is determined based on the undetermined coefficients for each sub-band.
Further, the calculating the undetermined coefficients of the respective sub-bands includes:
the undetermined coefficients of the respective subbands are calculated according to the following formula:
Figure GDA0002134958940000021
where τ is the delay parameter, fs is the sampling rate, ω cen-i For the center angular frequency of the ith sub-band, k is a coefficient number, k is more than or equal to 0 and less than or equal to N, N is the order of the fractional delay filter, and beta k-i The kth coefficient of the ith subband, i.e., the kth coefficient of the unit impulse response of the preferred fractional delay filter of the ith subband.
Further, the determining the unit impulse response of the preferred fractional delay filter of each sub-band according to the undetermined coefficients of each sub-band comprises:
the unit impulse response of the preferred fractional delay filter for each subband is determined separately according to:
h i (n)＝[β 0-i ,β 1-i ,β 2-i ,…,β N-i ]
wherein h is i (n) is the unit impulse response of the preferred fractional delay filter for the ith subband.
A second aspect of an embodiment of the present invention provides an electronic cochlear fractional delay filter construction apparatus, which may include:
the frequency band determining module is used for determining the frequency band of the fractional delay filter bank of the electronic cochlea;
a sub-band dividing module, configured to divide each sub-band from the frequency band of the fractional delay filter bank;
a filter determining module, configured to determine preferred fractional delay filters of respective sub-bands, where the preferred fractional delay filter of the i-th sub-band is a fractional delay filter when the i-th sub-band obtains a minimum error, i is greater than or equal to 1 and less than or equal to n, and n is a number of sub-bands divided from a frequency band of the fractional delay filter bank;
and the filter bank construction module is used for combining the preferential fractional delay filters of the sub-bands to construct the fractional delay filter bank of the electronic cochlea.
Further, the filter determining module may include:
a coefficient calculation unit for calculating the undetermined coefficients of the sub-bands respectively, wherein the undetermined coefficients are the coefficients in unit impulse response of the preferential fractional delay filter;
and the unit impulse response determining unit is used for determining unit impulse responses of the preferential fractional delay filters of the sub-bands according to the undetermined coefficients of the sub-bands.
Further, the coefficient calculating unit is specifically configured to calculate the undetermined coefficients of the respective subbands according to the following formulas:
Figure GDA0002134958940000041
where τ is the delay parameter, fs is the sampling rate, ω cen-i For the center angular frequency of the ith sub-band, k is a coefficient number, k is more than or equal to 0 and less than or equal to N, N is the order of the fractional delay filter, and beta k-i The kth coefficient of the ith subband, i.e., the kth coefficient of the unit impulse response of the preferred fractional delay filter of the ith subband.
Further, the unit impulse response determining unit is specifically configured to determine unit impulse responses of the preferred fractional delay filters of the respective sub-bands according to the following equation:
h i (n)＝[β 0-i ,β 1-i ,β 2-i ,…,β N-i ]
wherein h is i (n) is the unit impulse response of the preferred fractional delay filter for the ith subband.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium storing computer-readable instructions that, when executed by a processor, implement the steps of any one of the above-described cochlear fractional delay filter construction methods.
A fourth aspect of the embodiment of the present invention provides an electronic cochlea including a memory, a processor, and computer readable instructions stored in the memory and executable on the processor, the processor implementing the steps of any one of the above-described methods for constructing a fractional delay filter of the electronic cochlea when executing the computer readable instructions.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: the embodiment of the invention determines the frequency band of the fractional delay filter bank of the electronic cochlea; dividing each sub-band from the frequency band of the fractional delay filter bank; determining a preferred fractional delay filter of each sub-band, wherein the preferred fractional delay filter of the ith sub-band is a fractional delay filter when the ith sub-band obtains the minimum error, i is more than or equal to 1 and less than or equal to n, and n is the number of sub-bands divided from the frequency band of the fractional delay filter bank; and combining the preferred fractional delay filters of the sub-bands to construct the fractional delay filter bank of the electronic cochlea. According to the embodiment of the invention, the fractional delay filter with the minimum error for each sub-band is firstly determined respectively, and then the respective fractional delay filters of the sub-bands are combined into the fractional delay filter group of the full frequency band, so that the error of the fractional delay filter group is minimum in the whole.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an embodiment of a method for constructing a fractional delay filter of an electronic cochlea according to an embodiment of the invention;
FIG. 2 is a schematic diagram of one embodiment;
FIG. 3 is a block diagram of an embodiment of a device for constructing a fractional delay filter of an electronic cochlea according to the embodiment of the invention;
fig. 4 is a schematic block diagram of an electronic cochlea according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of a method for constructing a fractional delay filter of an electronic cochlea according to an embodiment of the present invention may include:
step S101, determining a frequency band of a fractional delay filter bank of the electronic cochlea.
The frequency band of the fractional delay filter bank may be set according to practical situations, which is not particularly limited in this embodiment. For example, it may be set to [152 7769], i.e., the frequency band ranges from 152Hz to 7769Hz.
Step S102, dividing each sub-band from the frequency band of the fractional delay filter bank.
The specific sub-band division manner may be set according to practical situations, which is not specifically limited in this embodiment.
For example, if the frequency band of the fractional delay filter bank is [152 7769], and the frequency bands are divided according to 24 sub-bands, the sub-bands may be respectively: [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, determining a preferred fractional delay filter for each subband.
Wherein the preferred fractional delay filter of the ith sub-band is the fractional delay filter that makes the ith sub-band get the minimum error, 1.ltoreq.i.ltoreq.n, n being the number of sub-bands divided from the frequency band of the fractional delay filter bank.
The original signal received by the electronic cochlea can be decomposed into the sum of subband signals of each subband, and the sum is shown as the following formula:
Figure GDA0002134958940000061
wherein x (n) is the original signal, x i (n) is a subband signal of the ith subband.
Considering that there may be a delay in practical application, the relationship between the original signal and the subband signals of each subband may be further expressed as:
Figure GDA0002134958940000062
wherein τ is a delay parameter, fs is a sampling rate, τf s Namely the delay sampling point number corresponding to the delay parameter.
For the parameters of practical application, the delay sampling point number tau f s Not necessarily an integer, it can be split into an integer delay D i And a fractional delay D d The following formula is shown:
τf s ＝D i +D d (0≤D d ≤1)
when D is d At 0, delay τf s The implementation of the delay, reduced to integer points, is simple, just a shift of the digital signal. And when D d If not 0, delay τf s Essentially interpolation is performed between the individual sample points of the known signal x (n).
Because the speech processing strategy of the electronic cochlea has already been frequency band divided, each sub-band is a narrow-band signal, the frequency bands are different, and the coefficients of the corresponding fractional delay filters are also different.
In this embodiment, the undetermined coefficients of the respective subbands may be first calculated according to the following equations:
Figure GDA0002134958940000071
wherein the predetermined coefficients are each coefficient, ω, in the unit impulse response of the preferential fractional delay filter cen-i For the center angular frequency of the ith sub-band, k is a coefficient number, k is more than or equal to 0 and less than or equal to N, N is the order of the fractional delay filter, and beta k-i The kth coefficient of the ith subband, i.e., the kth coefficient of the unit impulse response of the preferred fractional delay filter of the ith subband.
The unit impulse response of the preferred fractional delay filter for each subband may then be determined from the undetermined coefficients for each subband, respectively, namely:
h i (n)＝[β 0-i ,β 1-i ,β 2-i ,…,β N-i ]
wherein h is i (n) is the unit impulse response of the preferred fractional delay filter for the ith subband.
For the delay parameter required in the practical application of the electronic cochlea, the delay value tau and the center angular frequency omega of the corresponding frequency band can be substituted cen-i To calculate the required coefficient of the N-order fractional delay filter with an error of Gao Jiexiao o (Δω N ) Meanwhile, after the frequency bands of the electronic cochlea are divided, each frequency band is a narrow-band signal, and the delta omega value is smaller, so that the fractional delay error of each sub-band is smaller.
Step S104, the preferred fractional delay filters of the sub-bands are combined to construct the fractional delay filter bank of the electronic cochlea.
For the cochlea with different channel numbers (each sub-band is one channel), the amplitude-frequency response curves of the fractional delay filters are also different, and the 24-channel cochlea is taken as an example, and the center frequencies of the 24 channels are respectively: 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 (all in Hz) if fs=22.05 is set, and τf s =0.7, the amplitude-frequency response of the 3 rd order fractional delay filter can be calculated according to the method described above as shown in fig. 2.
The frequency bands of channels 1-24 in fig. 2 increase in sequence, with channel 1 having a center frequency of 213Hz and channel 24 having a center frequency of 7342.5Hz. The ideal fractional delay filter is an all-pass system with linear phase, and the system amplitude-frequency response is constant to be 1, so that the closer the system amplitude-frequency response of the constructed fractional delay filter is to be 1, the higher the accuracy is. As can be seen from the shape of the amplitude-frequency response curve of the fractional delay filter of 24 frequency bands in the figure, when the frequency is low, the amplitude-frequency response curve approaches 1 at a low frequency position, and when the frequency is gradually increased, the position where the amplitude-frequency response curve approaches 1 gradually changes from a low frequency to an intermediate frequency and further toward a high frequency position. Because each frequency band of the electronic cochlea only contains the narrow-band signal of the corresponding frequency band, the designed fractional delay filter realizes the characteristic that the amplitude-frequency response curve on the corresponding frequency band approaches to the ideal fractional delay filter, and the system amplitude-frequency response value of the filter at other positions deviates from 1, so that the accuracy of the fractional delay of the frequency band is not affected.
Since each sub-band in the cochlear implant filter bank is a narrowband signal, the effective portion of the system amplitude-frequency response curve of the fractional delay filter is limited to only that portion of the curve of the frequency band in which it is located.
In summary, the embodiment of the invention determines the frequency band of the fractional delay filter bank of the electronic cochlea; dividing each sub-band from the frequency band of the fractional delay filter bank; determining a preferred fractional delay filter of each sub-band, wherein the preferred fractional delay filter of the ith sub-band is a fractional delay filter when the ith sub-band obtains the minimum error, i is more than or equal to 1 and less than or equal to n, and n is the number of sub-bands divided from the frequency band of the fractional delay filter bank; and combining the preferred fractional delay filters of the sub-bands to construct the fractional delay filter bank of the electronic cochlea. According to the embodiment of the invention, the fractional delay filter with the minimum error for each sub-band is firstly determined respectively, and then the respective fractional delay filters of the sub-bands are combined into the fractional delay filter group of the full frequency band, so that the error of the fractional delay filter group is minimum in the whole.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
Corresponding to the method for constructing the electronic cochlear fractional delay filter in the above embodiment, fig. 3 shows a block diagram of an embodiment of an electronic cochlear fractional delay filter construction device according to an embodiment of the present invention.
In this embodiment, an electronic cochlear fractional delay filter construction apparatus may include:
a frequency band determining module 301, configured to determine a frequency band of a fractional delay filter bank of the electronic cochlea;
a subband dividing module 302, configured to divide each subband from the frequency band of the fractional delay filter bank;
a filter determining module 303, configured to determine preferred fractional delay filters of each subband, where the preferred fractional delay filter of the ith subband is a fractional delay filter when the ith subband achieves a minimum error, i is greater than or equal to 1 and less than or equal to n, and n is a number of subbands divided from a frequency band of the fractional delay filter bank;
the filter group construction module 304 is configured to combine the preferred fractional delay filters of the respective sub-bands to construct a fractional delay filter group of the cochlear implant.
Further, the filter determining module may include:
a coefficient calculation unit for calculating the undetermined coefficients of the sub-bands respectively, wherein the undetermined coefficients are the coefficients in unit impulse response of the preferential fractional delay filter;
and the unit impulse response determining unit is used for determining unit impulse responses of the preferential fractional delay filters of the sub-bands according to the undetermined coefficients of the sub-bands.
Further, the coefficient calculating unit is specifically configured to calculate the undetermined coefficients of the respective subbands according to the following formulas:
Figure GDA0002134958940000101
where τ is the delay parameter, fs is the sampling rate, ω cen-i For the center angular frequency of the ith sub-band, k is a coefficient number, k is more than or equal to 0 and less than or equal to N, N is the order of the fractional delay filter, and beta k-i The kth coefficient of the ith subband, i.e., the kth coefficient of the unit impulse response of the preferred fractional delay filter of the ith subband.
Further, the unit impulse response determining unit is specifically configured to determine unit impulse responses of the preferred fractional delay filters of the respective sub-bands according to the following equation:
h i (n)＝[β 0-i ,β 1-i ,β 2-i ,…,β N-i ]
wherein h is i (n) is the unit impulse response of the preferred fractional delay filter for the ith subband.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described apparatus, modules and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Fig. 4 shows a schematic block diagram of an electronic cochlea provided by an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown.
As shown in fig. 4, the electronic cochlea 4 of this embodiment includes: a processor 40, a memory 41 and a computer program 42 stored in the memory 41 and executable on the processor 40. The steps in the above embodiments of the method for constructing the fractional delay filter of the electronic cochlea are implemented when the processor 40 executes the computer program 42, for example, the steps S101 to S104 shown in fig. 1. Alternatively, the processor 40 may perform the functions of the modules/units of the apparatus embodiments described above, such as the functions of the modules 301 to 304 shown in fig. 3, when executing the computer program 42.
Illustratively, the computer program 42 may be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions to describe the execution of the computer program 42 in the cochlear implant 4.
It will be appreciated by those skilled in the art that fig. 4 is merely an example of cochlear implant 4, and is not intended to be limiting of cochlear implant 4, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., cochlear implant 4 may also include input and output devices, network access devices, buses, etc.
The processor 40 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSPs), application specific integrated circuits (Application Specific Integrated Circuit, ASICs), field programmable gate arrays (Field-Programmable Gate Array, FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the electronic cochlea 4, for example, a hard disk or a memory of the electronic cochlea 4. The memory 41 may also be an external storage device of the electronic cochlea 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the electronic cochlea 4. Further, the memory 41 may further include both an internal storage unit and an external storage device of the electronic cochlea 4. The memory 41 is used for storing the computer program and other programs and data required for the cochlear implant 4. The memory 41 may also be used for temporarily storing data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/cochlear implant and method may be implemented in other ways. For example, the above-described apparatus/cochlear implant embodiments are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims (8)

1. The method for constructing the electronic cochlea fractional delay filter is characterized by comprising the following steps of:
determining a frequency band of a fractional delay filter bank of the electronic cochlea;
dividing each sub-band from the frequency band of the fractional delay filter bank;
determining the preferred fractional delay filter for each subband separately comprises: calculating undetermined coefficients of all sub-bands respectively, wherein the undetermined coefficients are all coefficients in unit impulse response of a preferential fractional delay filter; determining unit impulse response of a preferred fractional delay filter of each sub-band according to undetermined coefficients of each sub-band, wherein the preferred fractional delay filter of the i-th sub-band is a fractional delay filter when the i-th sub-band obtains minimum error, i is more than or equal to 1 and less than or equal to n, and n is the number of sub-bands divided from the frequency band of the fractional delay filter group; each sub-band is a narrow-band signal, and coefficients of fractional delay filters corresponding to each sub-band are different;
and combining the preferred fractional delay filters of the sub-bands to construct the fractional delay filter bank of the electronic cochlea.
2. The method for constructing a fractional delay filter of an electronic cochlea according to claim 1, wherein said calculating the undetermined coefficients of the respective sub-bands respectively comprises:
the undetermined coefficients of the respective subbands are calculated according to the following formula:
Figure FDA0004072513480000011
where τ is the delay parameter, fs is the sampling rate, ω cen-i For the center angular frequency of the ith sub-band, k is a coefficient number, k is more than or equal to 0 and less than or equal to N, N is the order of the fractional delay filter, and beta k-i The kth coefficient of the ith subband, i.e., the kth coefficient of the unit impulse response of the preferred fractional delay filter of the ith subband.
3. The method for constructing a fractional delay filter of an electronic cochlea according to claim 2, wherein said determining the unit impulse response of the preferred fractional delay filter of each subband according to the undetermined coefficients of each subband, respectively, comprises:
the unit impulse response of the preferred fractional delay filter for each subband is determined separately according to:
h i (n)＝[β 0-i ,β 1-i ,β 2-i ,…,β N-i ]
wherein h is i (n) is the unit impulse response of the preferred fractional delay filter for the ith subband.
4. An electronic cochlear fractional delay filter construction apparatus, comprising:
the frequency band determining module is used for determining the frequency band of the fractional delay filter bank of the electronic cochlea;
a sub-band dividing module, configured to divide each sub-band from the frequency band of the fractional delay filter bank;
a filter determining module, configured to determine preferred fractional delay filters of respective sub-bands, where the preferred fractional delay filter of the i-th sub-band is a fractional delay filter when the i-th sub-band obtains a minimum error, i is greater than or equal to 1 and less than or equal to n, and n is a number of sub-bands divided from a frequency band of the fractional delay filter bank; the filter determination module may include: a coefficient calculation unit for calculating the undetermined coefficients of the sub-bands respectively, wherein the undetermined coefficients are the coefficients in unit impulse response of the preferential fractional delay filter; a unit impulse response determining unit for determining unit impulse responses of the preferred fractional delay filters of the respective sub-bands according to the undetermined coefficients of the respective sub-bands, respectively; each sub-band is a narrow-band signal, and coefficients of fractional delay filters corresponding to each sub-band are different;
and the filter bank construction module is used for combining the preferential fractional delay filters of the sub-bands to construct the fractional delay filter bank of the electronic cochlea.
5. The apparatus according to claim 4, wherein the coefficient calculating unit is specifically configured to calculate the undetermined coefficients of the respective subbands according to the following equation:
Figure FDA0004072513480000031
where τ is the delay parameter, fs is the sampling rate, ω cen-i For the center angular frequency of the ith sub-band, k is a coefficient number, k is more than or equal to 0 and less than or equal to N, N is the order of the fractional delay filter, and beta k-i The kth coefficient of the ith subband, i.e., the kth coefficient of the unit impulse response of the preferred fractional delay filter of the ith subband.
6. The apparatus according to claim 5, wherein the unit impulse response determining unit is specifically configured to determine the unit impulse response of the preferred fractional delay filter of each subband according to the following equation:
h i (n)＝[β 0-i ,β 1-i ,β 2-i ,…,β N-i ]
wherein h is i (n) is the unit impulse response of the preferred fractional delay filter for the ith subband.
7. A computer readable storage medium storing computer readable instructions which, when executed by a processor, implement the steps of the cochlea fractional delay filter construction method according to any one of claims 1 to 3.
8. An electronic cochlea including a memory, a processor, and computer readable instructions stored in the memory and executable on the processor, wherein execution of the computer readable instructions by the processor implements the steps of the method of constructing a fractional delay filter of an electronic cochlea as claimed in any one of claims 1 to 3.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107342750A (en) * 2017-07-04 2017-11-10 电子科技大学 Fractional delay optimization method suitable for more Nyquist areas and its realize structure

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US8170226B2 (en) * 2008-06-20 2012-05-01 Microsoft Corporation Acoustic echo cancellation and adaptive filters
EP2365630B1 (en) * 2010-03-02 2016-06-08 Harman Becker Automotive Systems GmbH Efficient sub-band adaptive fir-filtering
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EP2530840B1 (en) * 2011-05-30 2014-09-03 Harman Becker Automotive Systems GmbH Efficient sub-band adaptive FIR-filtering
US8664994B1 (en) * 2012-10-10 2014-03-04 Department of Electronics and Information Technology System to generate a predetermined fractional period time delay
EP3183853B1 (en) * 2014-09-05 2018-06-20 Huawei Technologies Co. Ltd. A communication receiver for compensating a group delay of a communication signal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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