CN103340718A - Method and system for processing signal of channel self-adaptation dynamic peak artificial cochlea - Google Patents
Method and system for processing signal of channel self-adaptation dynamic peak artificial cochlea Download PDFInfo
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Abstract
The invention discloses a method and system for processing a signal of a channel self-adaptation dynamic peak artificial cochlea. The method comprises the following steps frequency division processing is carried out on a transmitted sound signal, and the signal is decomposed into A frequency bands; the A frequency bands are combined into N channels according to the number N of usable electrodes, and envelope energy of each channel is stored at the same time; the target dynamic range of each channel is calculated, and the envelope energy of each channel is adjusted to be in the target dynamic range; the N channels are ranked according to the size of the envelope energy of the adjusted channels, and M channels with the largest energy are selected; sound-electric stimulus compression is carried out on the envelope energy of the M channels, and the channel needing to be stimulated among the M channels is determined, and the stimulus information and energy of the channel needing to be stimulated are transmitted. Therefore, by means of the method and system, the effect of background noise on recognition can be effectively reduced, and a normal audition environment effect can be guaranteed.
Description
Technical field
The present invention relates to the nerve stimulation field, refer to a kind of channel adaptive dynamic peak value artificial cochlea signal processing method and system especially.
Background technology
People's cochlear hair cell is the sensory cell that receives sound.When cochlear hair cell injury was serious, serious hearing impairment will appear.The artificial cochlea substitutes damaged feather cell, regains a kind of electronic installation of acoustical signal by the electricity irritation auditory nerve.It is made up of device in an external device and the implantable body usually.Device outside is called the speech processor, and device is called implant in the body.Artificial cochlear implant is embedded in subcutaneous location behind patient's the ear by operation, the electrod-array in the implant is inserted in operation in the tympanic canal of patient's cochlea, acts on mutually with patient's acoustic nerve.Fig. 1 provides typical modern artificial cochlea's structural representation.
Speech processor major function is by the mike pick-up of acoustic signals, after the signal processing unit device is handled acoustical signal and encoded, will stimulate required signal to be transmitted into body wirelessly by transmission coil and be implanted into device.Implant is made up of receiving coil, stimulator and electrod-array.Implant receives stimulus encoding signal and the various control signal from the speech processor, produces power supply simultaneously for the circuit working of stimulator.In the process of signal decoding, the Digital Logic of implant chip part checks the data of decoding and confirms, guarantees that every stimulus parameter is all within normal and safe scope.After decoding successfully, the stimulation generative circuit that implants generates two-way electric stimulation pulse according to amplitude, pulse width and the SR of appointment, and sends on the electrode channel of appointment.Except the stimulation of forward direction, implant returns the various status informations of chip and the physiological signal of electrode collection to external speech processor for systematic analysis and processing by transmission coil.
For normal good hearing person, the loudness tolerance range of sound is 120dB, and for artificial cochlea implantation person, the dynamic range of electricity irritation only has about 10-20dB, depends on user electroshock threshold (T value) and comfortable threshold value (C value).An input dynamic range that important indicator is acoustical signal of design language processing device for artificial cochlea, this has determined acoustical signal compressing mapping with how many dynamic ranges between the T value and C value of user.Modern artificial cochlea generally is limited to 40-70dB with input dynamic range, can adjust according to implantation person's personal considerations or the difference of signal processing strategy.
Generally, at each frame signal (4ms), artificial cochlea's outer body need send corresponding stimulus information to implant, comprises stimulation amplitude, pulse width, stimulation rates etc.; In addition, in view of implant itself does not have power supply, in order to keep the operate as normal of part in the body, also need in body, to transmit certain energy, suppose that each frame sound has M electrode to produce and stimulates, the external information that sends in the body and energy as shown in Figure 2, artificial cochlea's power consumption is mainly derived from this.
Under quiet environment, the speech processor generally provides a smaller stimulation (being no more than T value usually), only in order to keep the connection of inside and outside.Though this moment implantation person and asonant perception, energy loss is still little with normal audition situation difference.And when the environment of certain background noise was arranged, especially under the fixed background noise, though implantation person has perception of sound, extraneous noise can bring the impression of making us unhappy.
Summary of the invention
In view of this, the objective of the invention is to propose a kind of channel adaptive dynamic peak value artificial cochlea signal processing method and system, can improve artificial cochlea's utilization rate.
Based on the dynamic peak value artificial cochlea of above-mentioned purpose channel adaptive provided by the invention signal processing method, may further comprise the steps:
The acoustical signal that transmits being carried out frequency division handle, is signal decomposition A frequency range;
According to the number N of avaivable electrode, A frequency range merged into N passage, the envelope energy of preserving each passage simultaneously;
Calculate the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope;
Size according to the envelope energy of each passage after adjusting sorts M passage of selection energy maximum to N passage;
The envelope energy of each passage of M passage is carried out sound-electricity irritation compression, stimulus information and the energy determining to need the passage that stimulates in M the passage and transmit this stimulation channels.
Alternatively, before the frequency division that carries out acoustical signal is handled, earlier by the sampling module of automatic gain control, the acoustical signal of accurate undistorted collection 30-100dB dynamic range.
Alternatively, calculating the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope, is by adding up and storing first L frame envelope energy value, as the passage average energy of first time period; Add up afterwards
Frame to the
Frame envelope energy value is as the passage average energy of second time period; Relatively two energy values are preserved less energy value; By that analogy, finally preserved the minima of average energy in a period of time internal channel;
If the dynamic range of the acoustical signal of passage input is [Amin, Amax], press passage average energy minima, be divided into following 4 kinds of situations and adjust the passage dynamic range to target dynamic scope [A'min, A'max]:
If NL＜Dmin, input dynamic range is adjusted into [Amin-X, Amax], and namely target dynamic scope [A'min, A'max] is [Amin-X, Amax]; This moment, background noise was little, was in quiet situation, and the lower limit of dynamic range is reduced XdB;
If Dmin＜NL＜Dmid, input dynamic range is [Amin, Amax], and namely target dynamic scope [A'min, A'max] is [Amin, Amax], does not adjust input dynamic range;
If Dmid＜NL＜Dmax, input dynamic range is adjusted into [Dmax-C, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-C, Amax]; This moment, background noise was bigger, and the lower limit of dynamic range is improved CdB;
If NL〉Dmax, input dynamic range is adjusted into [Dmax-F, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-F, Amax]; This moment, background noise was the maximum noise of accepting, and the lower limit of dynamic range is improved FdB;
Wherein, NL is passage average energy minima, and Dmin is minimum background noise thresholding, and Dmid is the intermediate value of background noise, and Dmax is the maximum of background noise.
Further, when the envelope energy of each passage of M passage being carried out sound-electricity irritation compression, be in M passage, the energy of i passage is made as A
i, i≤M; Be converted to current amplitude E as follows
iPerhaps be designated as not stimulation channels:
A then
iDuring＜A'min, E
i=0, be designated as not stimulation channels;
A'min＜A then
iDuring＜A'max, E
i=Emin+ (Emax-Emin) * k;
A then
iDuring A'max, E
i=Emax;
Wherein, k=[(A
i-A'min)/(A'max-A'min)] ^p;
The span of p is 0.2-0.5, and Emin and Emax correspond respectively to the electricity irritation threshold of perception current of implantation person's electrode and the parameter of comfortable threshold value; The A'min of each passage and A'max correspond respectively to least energy and the ceiling capacity of adjusting the acoustical signal that transmits the back.
Further, the envelope energy of each passage of M passage is carried out after sound-electricity irritation compression, determine that the stimulus information that needs the passage that stimulates in M the passage and transmit this stimulation channels and energy are that to establish accumulative total stimulation channels number be Z, accumulative total not stimulation channels number is M-Z; According to the different requirements of inside and outside system, when the stimulation channels number when a certain number of, the external energy that transmits in the body will be not enough to maintain the operate as normal in the body, remember that this minimal stimulation port number is Y, 2≤Y≤M;
As Z during less than Y, need generation of forced stimulus information and the energy of Y passage at least; To inirritative electrode, do not transmit stimulus information and energy;
As Z during greater than Y, then directly produce stimulus information and the energy of Z passage; Transmit stimulus information and the energy of Z passage counter electrode; To inirritative electrode, do not transmit stimulus information and energy.
Further, as Z during less than Y, in M passage, the compression of the acoustic-electric of preceding Y passage of energy ordering maximum is by following processing: A
iDuring＜A'min, E
i=Emin; Then, transmit stimulus information and the energy of this Y passage counter electrode.
Based on above-mentioned purpose, the present invention also provides the dynamic peak value artificial cochlea of channel adaptive signal processing system, comprising:
The frequency division processing unit carries out frequency division to the acoustical signal that transmits and handles, and is signal decomposition A frequency range; According to the number N of avaivable electrode, A frequency range merged into N passage, the envelope energy of preserving each passage simultaneously;
Adjustment unit links to each other with the frequency division processing unit, calculates the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope;
Peak value is chosen the unit, links to each other with adjustment unit, and the size according to the envelope energy of each passage after adjusting sorts M passage of selection energy maximum to N passage;
The compression stimulating unit is chosen the unit with peak value and is linked to each other, the envelope energy of each passage of M passage is carried out sound-electricity irritation compress stimulus information and the energy determining to need the passage that stimulates in M the passage and transmit this stimulation channels.
Alternatively, described adjustment unit calculates the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope, is by adding up and storing first L frame envelope energy value, as the passage average energy of first time period; Add up afterwards
Frame to the
Frame envelope energy value is as the passage average energy of second time period; Relatively two energy values are preserved less energy value; By that analogy, finally preserved the minima of average energy in a period of time internal channel;
If the dynamic range of the acoustical signal of passage input is [Amin, Amax], press passage average energy minima, be divided into following 4 kinds of situations and adjust the passage dynamic range to target dynamic scope [A'min, A'max]:
If NL＜Dmin, input dynamic range is adjusted into [Amin-X, Amax], and namely target dynamic scope [A'min, A'max] is [Amin-X, Amax]; This moment, background noise was little, was in quiet situation, and the lower limit of dynamic range is reduced XdB;
If Dmin＜NL＜Dmid, input dynamic range is [Amin, Amax], and namely target dynamic scope [A'min, A'max] is [Amin, Amax], does not adjust input dynamic range;
If Dmid＜NL＜Dmax, input dynamic range is adjusted into [Dmax-C, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-C, Amax]; This moment, background noise was bigger, and the lower limit of dynamic range is improved CdB;
If NL〉Dmax, input dynamic range is adjusted into [Dmax-F, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-F, Amax]; This moment, background noise was the maximum noise of accepting, and the lower limit of dynamic range is improved FdB;
Wherein, NL is passage average energy minima, and Dmin is minimum background noise thresholding, and Dmid is the intermediate value of background noise, and Dmax is the maximum of background noise.
Further, described compression stimulating unit is in M passage when the envelope energy of each passage of M passage being carried out sound-electricity irritation compression, and the energy of i passage is made as A
i, i≤M; Be converted to current amplitude E as follows
iPerhaps be designated as not stimulation channels:
A then
iDuring＜A'min, E
i=0, be designated as not stimulation channels;
A'min＜A then
iDuring＜A'max, E
i=Emin+ (Emax-Emin) * k;
A then
iDuring A'max, E
i=Emax;
Wherein, k=[(A
i-A'min)/(A'max-A'min)] ^p;
The span of p is 0.2-0.5, and Emin and Emax correspond respectively to the electricity irritation threshold of perception current of implantation person's electrode and the parameter of comfortable threshold value; The A'min of each passage and A'max correspond respectively to least energy and the ceiling capacity of adjusting the acoustical signal that transmits the back;
The envelope energy of each passage of M passage is carried out after sound-electricity irritation compression, determine that the stimulus information that needs the passage that stimulates in M the passage and transmit this stimulation channels and energy are that to establish accumulative total stimulation channels number be Z, totally the stimulation channels number is not M-Z; According to the different requirements of inside and outside system, when the stimulation channels number when a certain number of, the external energy that transmits in the body will be not enough to maintain the operate as normal in the body, remember that this minimal stimulation port number is Y, 2≤Y≤M;
As Z during less than Y, need generation of forced stimulus information and the energy of Y passage at least; To inirritative electrode, do not transmit stimulus information and energy;
As Z during greater than Y, then directly produce stimulus information and the energy of Z passage; Transmit stimulus information and the energy of Z passage counter electrode; To inirritative electrode, do not transmit stimulus information and energy.
Further, described compression stimulating unit is as Z during less than Y, and in M passage, the compression of the acoustic-electric of preceding Y passage of energy ordering maximum is by following processing: A
iDuring＜A'min, E
i=Emin; Then, transmit stimulus information and the energy of this Y passage counter electrode.
From above as can be seen, channel adaptive provided by the invention dynamic peak value artificial cochlea signal processing method and system, by calculating the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope, effectively reduce background noise to the influence of identification, guarantee normal acoustic surrounding effect.Simultaneously, the envelope energy of each passage after adjusting is carried out sound-electricity irritation compression, stimulus information and the energy determining to need the passage that stimulates in M the passage and transmit this stimulation channels have reduced the consumption of the energy.
Description of drawings
Fig. 1 is artificial cochlea's of the prior art structural representation;
Fig. 2 is information and the energy diagram that sends in the export-oriented body of each frame of artificial cochlea in the prior art;
Fig. 3 is the schematic flow sheet of the dynamic peak value artificial cochlea of embodiment of the invention channel adaptive signal processing method;
Fig. 4 is the structural representation of the dynamic peak value artificial cochlea of embodiment of the invention channel adaptive signal processing system.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Consult shown in Figure 3ly, for the schematic flow sheet of the dynamic peak value artificial cochlea of embodiment of the invention channel adaptive signal processing method, as embodiments of the invention, the dynamic peak value artificial cochlea of described channel adaptive signal processing method may further comprise the steps:
Step 301 is carried out frequency division to the acoustical signal that transmits and is handled, and is signal decomposition A frequency range.In one embodiment of the invention, concrete implementation procedure is as follows:
The acoustical signal that transmits is carried out frequency division handle, can utilize digital signal processing chip (DSP) that the acoustical signal that collects is carried out frequency division and handle.Preferably, digital signal processing chip (DSP) can carry out preemphasis to the acoustical signal that collects earlier to be handled, and is to carry out preemphasis according to following table to handle in one embodiment of the invention:
| <500Hz | 500‐4kHz | >4kHz |
| ‐10dB | ‐6.7dB | 0dB |
Adopt 8 rank butterworth bank of filters to carry out frequency division to the signal after the preemphasis then and handle, be signal decomposition A frequency range, the span of A is 32-128.
Preferably, in an embodiment of the present invention before the frequency division that carries out acoustical signal is handled, earlier by the sampling module of automatic gain control, the acoustical signal of accurate undistorted collection 30-100dB dynamic range, acquisition rate is 16K.
Step 302 according to the number N of avaivable electrode, is merged into N passage, the envelope energy of preserving each passage simultaneously with A frequency range.The specific implementation process is as follows:
According to the number N of cochlear implant system avaivable electrode, can utilize the Greenwood formula that A frequency range merged into N passage, the envelope energy of preserving each passage simultaneously.Wherein, the span of N is 2-24.
In one embodiment of the invention, the avaivable electrode number is 24, presses the greenwood formula, and acoustical signal is divided into 24 passages in the 100-8kHz scope.To the subband signal of 24 passages, can carry out low-pass filtering (by frequency 500Hz) by 6 rank butterworth wave filter, obtain the envelope energy value of 24 passages.
Step 303 is calculated the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope, and the specific implementation process is as follows:
Add up and store first L frame envelope energy value, as the passage average energy of first time period; Add up afterwards
Frame to the
Frame envelope energy value is as the passage average energy of second time period; Relatively two energy values are preserved less energy value; By that analogy, finally preserved the minima of average energy in a period of time internal channel;
If the dynamic range of the acoustical signal of passage input is [Amin, Amax], press passage average energy minima, be divided into following 4 kinds of situations and adjust the passage dynamic range to target dynamic scope [A'min, A'max]:
If NL＜Dmin, input dynamic range is adjusted into [Amin-X, Amax], and namely target dynamic scope [A'min, A'max] is [Amin-X, Amax].This moment, background noise was little, was in quiet situation, and the lower limit of dynamic range is reduced XdB, can allow implantation person hear how smaller sound.Wherein, the span of X is 5dB-10dB, and preferably, X is 5dB in embodiments of the present invention.
If Dmin＜NL＜Dmid, input dynamic range is [Amin, Amax], and namely target dynamic scope [A'min, A'max] is [Amin, Amax].Handle as general acoustic surrounding in the case, do not adjust input dynamic range;
If Dmid＜NL＜Dmax, input dynamic range is adjusted into [Dmax-C, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-C, Amax].This moment, background noise was bigger, and the lower limit of dynamic range is improved CdB, was exactly that background noise is got rid of outside dynamic range as far as possible.Wherein, the span of C is 5dB-10dB, and preferably, C is 10dB in embodiments of the present invention.
If NL〉Dmax, input dynamic range is adjusted into [Dmax-F, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-F, Amax].This moment, background noise was the maximum noise of accepting, and the lower limit of dynamic range is improved FdB, was exactly that background noise is got rid of outside dynamic range as far as possible.Wherein, C is less than F.Wherein, the span of F is 10dB-15dB, and preferably, F is 15dB in embodiments of the present invention.
Wherein, NL is passage average energy minima, and Dmin is minimum background noise thresholding, and Dmid is the intermediate value of background noise, and Dmax is the maximum of background noise.
In one embodiment of the invention, will sort from big to small according to energy in 24 passages, select wherein 8 channel energies of energy maximum, be assumed to be 1,5,6,8 passages and 10,12,13,24 passages.
Step 305 is carried out sound-electricity irritation compression, stimulus information and the energy determining to need the passage that stimulates in M the passage and transmit this stimulation channels to the envelope energy of each passage of M passage.In one embodiment of the invention, concrete implementation procedure is as follows:
1) in M passage, the energy of i passage is made as A
i, wherein, i≤M.Be converted to current amplitude E as follows
iPerhaps be designated as not stimulation channels:
A then
iDuring＜A'min, E
i=0, be designated as not stimulation channels;
A'min＜A then
iDuring＜A'max, E
i=Emin+ (Emax-Emin) * k;
A then
iDuring A'max, E
i=Emax;
Wherein, k=[(A
i-A'min)/(A'max-A'min)] ^p;
The span of p is 0.2-0.5, and preferably, p is 0.2 in embodiments of the present invention; Emin and Emax correspond respectively to the electricity irritation threshold of perception current of implantation person's electrode and the parameter of comfortable threshold value.
The A'min of each passage and A'max correspond respectively to least energy and the ceiling capacity that step 203 is adjusted the acoustical signal that transmits the back, and namely [A'min, A'max] is the acoustical signal amplitude range that each passage is imported in step 205.
2) stimulus information and the energy of determining to need the passage that stimulates in M the passage and transmitting this stimulation channels: establishing accumulative total stimulation channels number is Z, and accumulative total not stimulation channels number is M-Z.According to the different requirements of inside and outside system, when the stimulation channels number when a certain number of, the external energy that transmits in the body will be not enough to maintain the operate as normal in the body, remember that this minimal stimulation port number is Y, wherein 2≤Y≤M.
As Z during less than Y, need generation of forced stimulus information and the energy of Y passage at least.As an embodiment, in M passage, the compression of the acoustic-electric of preceding Y passage of energy ordering maximum is by following processing: A
iDuring＜A'min, E
i=Emin.Then, transmit stimulus information and the energy of this Y passage counter electrode.
As Z during greater than Y, then directly produce stimulus information and the energy of Z passage.Transmit stimulus information and the energy of Z passage counter electrode; To inirritative electrode, do not transmit stimulus information and energy.
Consult shown in Figure 4ly, be the structural representation of the dynamic peak value artificial cochlea of embodiment of the invention channel adaptive signal processing system, the dynamic peak value artificial cochlea of described channel adaptive signal processing system comprises:
Frequency division processing unit 401, major function comprises:
1) acoustical signal that transmits being carried out frequency division and handle, is signal decomposition A frequency range.
In one embodiment of the invention, the acoustical signal that transmits is carried out frequency division handle, can utilize digital signal processing chip (DSP) that the acoustical signal that collects is carried out frequency division and handle.Preferably, digital signal processing chip (DSP) can carry out preemphasis to the acoustical signal that collects earlier to be handled, and is to carry out preemphasis according to following table to handle in one embodiment of the invention:
| <500Hz | 500‐4kHz | >4kHz |
| ‐10dB | ‐6.7dB | 0dB |
Adopt 8 rank butterworth bank of filters to carry out frequency division to the signal after the preemphasis then and handle, be signal decomposition A frequency range, the span of A is 32-128.
Preferably, in an embodiment of the present invention before the frequency division that carries out acoustical signal is handled, earlier by the sampling module of automatic gain control, the acoustical signal of accurate undistorted collection 30-100dB dynamic range, acquisition rate is 16K.
2) according to the number N of avaivable electrode, A frequency range merged into N passage, the envelope energy of preserving each passage simultaneously.Wherein, the span of N is 2-24.
In one embodiment of the invention, according to the number N of cochlear implant system avaivable electrode, can utilize the Greenwood formula that A frequency range merged into N passage, the envelope energy of preserving each passage simultaneously.In one embodiment of the invention, the avaivable electrode number is 24, presses the greenwood formula, and acoustical signal is divided into 24 passages in the 100-8kHz scope.To the subband signal of 24 passages, can carry out low-pass filtering (by frequency 500Hz) by 6 rank butterworth wave filter, obtain the envelope energy value of 24 passages.
Adjustment unit 402 links to each other with frequency division processing unit 401.Calculate the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope.Major function comprises:
Add up and store first L frame envelope energy value, as the passage average energy of first time period; Add up afterwards
Frame to the
Frame envelope energy value is as the passage average energy of second time period; Relatively two energy values are preserved less energy value; By that analogy, finally preserved the minima of average energy in a period of time internal channel;
If the dynamic range of the acoustical signal of passage input is [Amin, Amax], press passage average energy minima, be divided into following 4 kinds of situations and adjust the passage dynamic range to target dynamic scope [A'min, A'max]:
If NL＜Dmin, input dynamic range is adjusted into [Amin-X, Amax], and namely target dynamic scope [A'min, A'max] is [Amin-X, Amax].This moment, background noise was little, was in quiet situation, and the lower limit of dynamic range is reduced XdB, can allow implantation person hear how smaller sound.Wherein, the span of X is 5dB-10dB, and preferably, X is 5dB in embodiments of the present invention.
If Dmin＜NL＜Dmid, input dynamic range is [Amin, Amax], and namely target dynamic scope [A'min, A'max] is [Amin, Amax].Namely handle as general acoustic surrounding in the case, do not adjust input dynamic range;
If Dmid＜NL＜Dmax, input dynamic range is adjusted into [Dmax-C, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-C, Amax].This moment, background noise was bigger, and the lower limit of dynamic range is improved CdB, was exactly that background noise is got rid of outside dynamic range as far as possible.Wherein, the span of C is 5dB-10dB, and preferably, C is 10dB in embodiments of the present invention.
If NL〉Dmax, input dynamic range is adjusted into [Dmax-F, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-F, Amax].This moment, background noise was the maximum noise of accepting, and the lower limit of dynamic range is improved FdB, was exactly that background noise is got rid of outside dynamic range as far as possible.Wherein, C is less than F.Wherein, the span of F is 10dB-15dB, and preferably, F is 15dB in embodiments of the present invention.
Wherein, NL is passage average energy minima, and Dmin is minimum background noise thresholding, and Dmid is the intermediate value of background noise, and Dmax is the maximum of background noise.
Peak value is chosen unit 403, links to each other with adjustment unit 402.Major function comprises:
Size according to the envelope energy of each passage after adjusting sorts to N passage, M passage of selection energy maximum, and wherein M is less than N.
In one embodiment of the invention, will sort from big to small according to energy in 24 passages, select wherein 8 channel energies of energy maximum, be assumed to be 1,5,6,8 passages and 10,12,13,24 passages.
Compression stimulating unit 404 is chosen unit 403 with peak value and is linked to each other.The envelope energy of each passage of M passage is carried out sound-electricity irritation compression, stimulus information and the energy determining to need the passage that stimulates in M the passage and transmit this stimulation channels.Major function comprises:
1) in M passage, the energy of i passage is made as A
i, wherein, i≤M.Be converted to current amplitude E as follows
iPerhaps be designated as not stimulation channels:
A then
iDuring＜A'min, E
i=0, be designated as not stimulation channels;
A'min＜A then
iDuring＜A'max, E
i=Emin+ (Emax-Emin) * k;
A then
iDuring A'max, E
i=Emax;
Wherein, k=[(A
i-A'min)/(A'max-A'min)] ^p;
The span of p is 0.2-0.5, and preferably, p is 0.2 in embodiments of the present invention; Emin and Emax correspond respectively to the electricity irritation threshold of perception current of implantation person's electrode and the parameter of comfortable threshold value.
The A'min of each passage and A'max correspond respectively to least energy and the ceiling capacity that adjustment unit 402 is adjusted the acoustical signal that transmits the back, and namely [A'min, A'max] is the acoustical signal amplitude range of each passage input in compression stimulating unit 404.
2) stimulus information and the energy of determining to need the passage that stimulates in M the passage and transmitting this stimulation channels: establishing accumulative total stimulation channels number is Z, and accumulative total not stimulation channels number is M-Z.According to the different requirements of inside and outside system, when the stimulation channels number when a certain number of, the external energy that transmits in the body will be not enough to maintain the operate as normal in the body, remember that this minimal stimulation port number is Y, wherein 2≤Y≤M.
As Z during less than Y, need generation of forced stimulus information and the energy of Y passage at least.As an embodiment, in M passage, the compression of the acoustic-electric of preceding Y passage of energy ordering maximum is by following processing: A
iDuring＜Amin, E
i=Emin.Then, transmit stimulus information and the energy of this Y passage counter electrode.
As Z during greater than Y, then directly produce stimulus information and the energy of X passage.Transmit stimulus information and the energy of Z passage counter electrode; To inirritative electrode, do not transmit stimulus information and energy.
From top description as can be seen, channel adaptive of the present invention dynamic peak value artificial cochlea signal processing method and system, the creationary target dynamic scope that has proposed to calculate each passage, and the envelope energy of each passage is adjusted in the target dynamic scope, has reduced the influence of background noise to hearing effect very effectively; Simultaneously, convert electric current to carrying out acoustic-electric compression, and when conversion, work as A
iDuring＜Amin, E
i=0, be designated as not stimulation channels, reduced the consumption of artificial cochlea's energy to a great extent; And, under the prerequisite of not damaging implant user's hearing effect, improved artificial cochlea's efficient; Battery for artificial cochlea implantation person uses has prolonged its life-span, and utilization rate is improved; Meanwhile, under situation about cutting down the consumption of energy, in order to guarantee that the artificial cochlea inside and outside keeps being communicated with, creatively designed judgement and the processing of stimulation channels at least; At last, whole channel adaptive dynamic peak value artificial cochlea signal processing method and system implement simple and easy to do.
Those of ordinary skill in the field are to be understood that: the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the dynamic peak value artificial cochlea of a channel adaptive signal processing method is characterized in that, may further comprise the steps:
The acoustical signal that transmits being carried out frequency division handle, is signal decomposition A frequency range;
According to the number N of avaivable electrode, A frequency range merged into N passage, the envelope energy of preserving each passage simultaneously;
Calculate the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope;
Size according to the envelope energy of each passage after adjusting sorts M passage of selection energy maximum to N passage;
The envelope energy of each passage of M passage is carried out sound-electricity irritation compression, stimulus information and the energy determining to need the passage that stimulates in M the passage and transmit this stimulation channels.
2. method according to claim 1 is characterized in that, before the frequency division that carries out acoustical signal is handled, and earlier by the sampling module of automatic gain control, the acoustical signal of accurate undistorted collection 30-100dB dynamic range.
3. method according to claim 1, it is characterized in that, calculate the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope, be by adding up and storing first L frame envelope energy value, as the passage average energy of first time period; Add up afterwards
Frame to the
Frame envelope energy value is as the passage average energy of second time period; Relatively two energy values are preserved less energy value; By that analogy, finally preserved the minima of average energy in a period of time internal channel;
If the dynamic range of the acoustical signal of passage input is [Amin, Amax], press passage average energy minima, be divided into following 4 kinds of situations and adjust the passage dynamic range to target dynamic scope [A'min, A'max]:
If NL＜Dmin, input dynamic range is adjusted into [Amin-X, Amax], and namely target dynamic scope [A'min, A'max] is [Amin-X, Amax]; This moment, background noise was little, was in quiet situation, and the lower limit of dynamic range is reduced XdB;
If Dmin＜NL＜Dmid, input dynamic range is [Amin, Amax], and namely target dynamic scope [A'min, A'max] is [Amin, Amax], does not adjust input dynamic range;
If Dmid＜NL＜Dmax, input dynamic range is adjusted into [Dmax-C, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-C, Amax]; This moment, background noise was bigger, and the lower limit of dynamic range is improved CdB;
If NL〉Dmax, input dynamic range is adjusted into [Dmax-F, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-F, Amax]; This moment, background noise was the maximum noise of accepting, and the lower limit of dynamic range is improved FdB;
Wherein, NL is passage average energy minima, and Dmin is minimum background noise thresholding, and Dmid is the intermediate value of background noise, and Dmax is the maximum of background noise.
4. method according to claim 3 is characterized in that, when the envelope energy of each passage of M passage being carried out sound-electricity irritation compression, is in M passage, and the energy of i passage is made as A
i, i≤M; Be converted to current amplitude E as follows
iPerhaps be designated as not stimulation channels:
A then
iDuring＜A'min, E
i=0, be designated as not stimulation channels;
A'min＜A then
iDuring＜A'max, E
i=Emin+ (Emax-Emin) * k;
A then
iDuring A'max, E
i=Emax;
Wherein, k=[(A
i-A'min)/(A'max-A'min)] ^p;
The span of p is 0.2-0.5, and Emin and Emax correspond respectively to the electricity irritation threshold of perception current of implantation person's electrode and the parameter of comfortable threshold value; The A'min of each passage and A'max correspond respectively to least energy and the ceiling capacity of adjusting the acoustical signal that transmits the back.
5. method according to claim 4, it is characterized in that, the envelope energy of each passage of M passage is carried out after sound-electricity irritation compression, determine that the stimulus information that needs the passage that stimulates in M the passage and transmit this stimulation channels and energy are that to establish accumulative total stimulation channels number be Z, accumulative total not stimulation channels number is M-Z; According to the different requirements of inside and outside system, when the stimulation channels number when a certain number of, the external energy that transmits in the body will be not enough to maintain the operate as normal in the body, remember that this minimal stimulation port number is Y, 2≤Y≤M;
As Z during less than Y, need generation of forced stimulus information and the energy of Y passage at least; To inirritative electrode, do not transmit stimulus information and energy;
As Z during greater than Y, then directly produce stimulus information and the energy of Z passage; Transmit stimulus information and the energy of Z passage counter electrode; To inirritative electrode, do not transmit stimulus information and energy.
6. method according to claim 5 is characterized in that, as Z during less than Y, in M passage, the compression of the acoustic-electric of preceding Y passage of energy ordering maximum is by following processing: A
iDuring＜A'min, E
i=Emin; Then, transmit stimulus information and the energy of this Y passage counter electrode.
7. the dynamic peak value artificial cochlea of a channel adaptive signal processing system is characterized in that, comprising:
The frequency division processing unit carries out frequency division to the acoustical signal that transmits and handles, and is signal decomposition A frequency range; According to the number N of avaivable electrode, A frequency range merged into N passage, the envelope energy of preserving each passage simultaneously;
Adjustment unit links to each other with the frequency division processing unit, calculates the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope;
Peak value is chosen the unit, links to each other with adjustment unit, and the size according to the envelope energy of each passage after adjusting sorts M passage of selection energy maximum to N passage;
The compression stimulating unit is chosen the unit with peak value and is linked to each other, the envelope energy of each passage of M passage is carried out sound-electricity irritation compress stimulus information and the energy determining to need the passage that stimulates in M the passage and transmit this stimulation channels.
8. system according to claim 7, it is characterized in that, described adjustment unit calculates the target dynamic scope of each passage, and the envelope energy of each passage is adjusted in the target dynamic scope, be by adding up and storing first L frame envelope energy value, as the passage average energy of first time period; Add up afterwards
Frame to the
Frame envelope energy value is as the passage average energy of second time period; Relatively two energy values are preserved less energy value; By that analogy, finally preserved the minima of average energy in a period of time internal channel;
If the dynamic range of the acoustical signal of passage input is [Amin, Amax], press passage average energy minima, be divided into following 4 kinds of situations and adjust the passage dynamic range to target dynamic scope [A'min, A'max]:
If NL＜Dmin, input dynamic range is adjusted into [Amin-X, Amax], and namely target dynamic scope [A'min, A'max] is [Amin-X, Amax]; This moment, background noise was little, was in quiet situation, and the lower limit of dynamic range is reduced XdB;
If Dmin＜NL＜Dmid, input dynamic range is [Amin, Amax], and namely target dynamic scope [A'min, A'max] is [Amin, Amax], does not adjust input dynamic range;
If Dmid＜NL＜Dmax, input dynamic range is adjusted into [Dmax-C, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-C, Amax]; This moment, background noise was bigger, and the lower limit of dynamic range is improved CdB;
If NL〉Dmax, input dynamic range is adjusted into [Dmax-F, Amax], and namely target dynamic scope [A'min, A'max] is [Dmax-F, Amax]; This moment, background noise was the maximum noise of accepting, and the lower limit of dynamic range is improved FdB;
Wherein, NL is passage average energy minima, and Dmin is minimum background noise thresholding, and Dmid is the intermediate value of background noise, and Dmax is the maximum of background noise.
9. system according to claim 8 is characterized in that, described compression stimulating unit is in M passage when the envelope energy of each passage of M passage being carried out sound-electricity irritation compression, and the energy of i passage is made as A
i, i≤M; Be converted to current amplitude E as follows
iPerhaps be designated as not stimulation channels:
A then
iDuring＜A'min, E
i=0, be designated as not stimulation channels;
A'min＜A then
iDuring＜A'max, E
i=Emin+ (Emax-Emin) * k;
A then
iDuring A'max, E
i=Emax;
Wherein, k=[(A
i-A'min)/(A'max-A'min)] ^p;
The span of p is 0.2-0.5, and Emin and Emax correspond respectively to the electricity irritation threshold of perception current of implantation person's electrode and the parameter of comfortable threshold value; The A'min of each passage and A'max correspond respectively to least energy and the ceiling capacity of adjusting the acoustical signal that transmits the back;
The envelope energy of each passage of M passage is carried out after sound-electricity irritation compression, determine that the stimulus information that needs the passage that stimulates in M the passage and transmit this stimulation channels and energy are that to establish accumulative total stimulation channels number be Z, totally the stimulation channels number is not M-Z; According to the different requirements of inside and outside system, when the stimulation channels number when a certain number of, the external energy that transmits in the body will be not enough to maintain the operate as normal in the body, remember that this minimal stimulation port number is Y, 2≤Y≤M;
As Z during less than Y, need generation of forced stimulus information and the energy of Y passage at least; To inirritative electrode, do not transmit stimulus information and energy;
As Z during greater than Y, then directly produce stimulus information and the energy of Z passage; Transmit stimulus information and the energy of Z passage counter electrode; To inirritative electrode, do not transmit stimulus information and energy.
10. system according to claim 9 is characterized in that, described compression stimulating unit is as Z during less than Y, and in M passage, the compression of the acoustic-electric of preceding Y passage of energy ordering maximum is by following processing: A
iDuring＜A'min, E
i=Emin; Then, transmit stimulus information and the energy of this Y passage counter electrode.
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| CN105814911A (en) * | 2013-12-11 | 2016-07-27 | Med-El电气医疗器械有限公司 | Multi-layer laminate with high internal damping |
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