Source: http://www.google.com/patents/US7937157?dq=5,381,459
Timestamp: 2017-01-23 11:33:21
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Matched Legal Cases: ['Application No. 07075655', 'Application No. 07075655', 'Application No. 07075655', 'Application No. 07075655', 'Application No. 07075655', 'Application No. 07075655', 'Application No. 07075655']

Patent US7937157 - Electrical nerve stimulation based on channel specific sequences - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA method of activating at least two electrodes in a multichannel electrode array using channel specific sampling sequences is presented. A channel specific sampling sequence is defined for each electrode, the sequence having a particular duration, pulse amplitude distribution, and number of pulses. A...http://www.google.com/patents/US7937157?utm_source=gb-gplus-sharePatent US7937157 - Electrical nerve stimulation based on channel specific sequencesAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7937157 B2Publication typeGrantApplication numberUS 11/685,887Publication dateMay 3, 2011Filing dateMar 14, 2007Priority dateAug 26, 1999Fee statusPaidAlso published asCA2382964A1, CA2382964C, DE60036875D1, DE60036875T2, EP1207938A1, EP1207938B1, EP1854504A2, EP1854504A3, EP1854504B1, EP2208507A1, EP2208507B1, US6594525, US7209789, US8798758, US20030105504, US20070156202, US20110230934, US20140324122, WO2001013991A1Publication number11685887, 685887, US 7937157 B2, US 7937157B2, US-B2-7937157, US7937157 B2, US7937157B2InventorsClemens M. ZierhoferOriginal AssigneeMed-El Elektromedizinische Geraete GmbhExport CitationBiBTeX, EndNote, RefManPatent Citations (27), Non-Patent Citations (45), Referenced by (4), Classifications (8), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetElectrical nerve stimulation based on channel specific sequences
US 7937157 B2Abstract
12. A cochlear implant system comprising: a multi-channel electrode array including at least two electrodes spaced in the array such that their electrical fields overlap to cause spatial channel interaction; and a processor for calculating amplitudes of electrode stimulation signals associated with the at least two electrodes based, at least in part, on parameters of spatial channel interaction between the at least two electrodes, wherein the stimulator uses properties of a tri-diagonal matrix to determine the amplitudes of the electrode signals. Description
(1) splitting up of the audio frequency range into spectral bands by means of a filter bank, (2) envelope detection of each filter output signal, (3) instantaneous nonlinear compression of the envelope signal (map law). According to the tonotopic organization of the cochlea, each stimulation electrode in the scala tympani is associated with a band pass filter of the external filter bank. For stimulation, symmetrical biphasic current pulses are applied. The amplitudes of the stimulation pulses are directly obtained from the compressed envelope signals (step (3) of above). These signals are sampled sequentially, and the stimulation pulses are applied in a strictly non-overlapping sequence. Thus, as a typical CIS-feature, only one stimulation channel is active at one time. The overall stimulation rate is comparatively high. For example, assuming an overall stimulation rate of 18 kpps, and using an 12 channel filter bank, the stimulation rate per channel is 1.5 kpps. Such a stimulation rate per channel usually is sufficient for adequate temporal representation of the envelope signal.
a. derived from a sinusoid within [0 π] b. derived from a sinusoid within [0 π/2], amplitudes monotonically increasing FIG. 2 shows stimulation with channel specific sampling sequences (CSSS)
a. Band pass filter output signal (653 Hz-876 Hz) b. Half wave rectified band pass filter output c. Associated CSSS stimulation sequence FIG. 3 shows stimulation with channel specific sampling sequences (CSSS)
a. Bandpass filter output signal (3457 Hz-5500 Hz) b. Half wave rectified band pass filter output c. Associated CSSS stimulation sequence FIG. 4 shows a comparison of stimulation patterns between CSSS and CIS
a. Band pass filter output signal (653 Hz-876 Hz) b. CSSS stimulation sequence c. CIS stimulation sequence (envelope sampling with single pulses at 1.5 kpps) FIG. 5 shows a comparison of stimulation patterns between CSSS and CIS
a. Band pass filter output signal (3457 Hz-5500 Hz) b. CSSS stimulation sequence c. CIS stimulation sequence (envelope sampling with single pulses at 1.5 kpps) FIG. 6 shows estimated potential distributions in the scala tympani (λ=3.6 mm, d=2.8 mm)
a. Responses to single channel activation b. Effective Potential Distributions (asterisks for CIS, circles for CSSS) FIG. 7 shows a comparison of overall stimulation patterns between CSSS and CIS (electrode distance: d=2.8 mm, space constant: λ=3.6 mm)
a. 6-channel CSSS b. 6-channel CIS DETAILED DESCRIPTION OF THE INVENTION
c ( 1 ) = c ( 2 ) = a 2 b . With (A20), the amplitudes y′k0−1 and y′k0+L can be determined:
(1) Compute yn by multiplication of H−1 and xn. (2) Select elements yn=k<0 and set yk′=0. (3) Modify elements of H−1 according to (A21), (A22), (A23) (4) Remove all lines and rows of H−1 with indices k, and remove all elements xk. (5) Compute elements yn′, which are neighboring to zero-sequences. Example
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