Electronic filters, hearing aids and methods

Details Electronic filters, hearing aids and methods Electronic filters, hearing aids and methods

1988-03-23

1991-05-14

Ng, Jin F.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 682, 381 684, 381 83, 381 93, H04R 2500, H03B 2900

Patent

active

050162802

ABSTRACT:
An electronic filter for an electroacoustic system. The system has a microphone for generating an electrical output from external sounds and an electrically driven transducer for emitting sound. Some of the sound emitted by the transducer returns to the microphone means to add a feedback contribution to its electical output. The electronic filter includes a first circuit for electronic processing of the electrical output of the microphone to produce a filtered signal. An adaptive filter, interconnected with the first circuit, performs electronic processing of the filtered signal to produce an adaptive output to the first circuit to substantially offset the feedback contribution in the electrical output of the microphone, and the adaptive filter includes means for adapting only in response to polarities of signals supplied to and from the first circuit. Other electronic filters for hearing aids, public address systems and other electroacoustic systems, as well as such systems, and methods of operating them are also disclosed.

REFERENCES:
patent: 3818149 (1974-06-01), Stearns et al.
patent: 4025721 (1977-05-01), Graupe et al.
patent: 4038536 (1977-07-01), Feintuch
patent: 4053846 (1977-10-01), Acker
patent: 4099035 (1978-07-01), Yanick
patent: 4118604 (1978-10-01), Yanick
patent: 4185168 (1980-01-01), Graupe et al.
patent: 4186384 (1980-01-01), Acker
patent: 4187413 (1980-02-01), Moser
patent: 4188667 (1980-02-01), Graupe et al.
patent: 4232192 (1980-11-01), Beex
patent: 4243959 (1981-01-01), Duttweiler
patent: 4417317 (1983-11-01), White et al.
patent: 4425481 (1984-01-01), Mansgold et al.
patent: 4449237 (1984-05-01), Stepp et al.
patent: 4471171 (1984-09-01), Kopke et al.
patent: 4490841 (1984-12-01), Chaplin et al.
patent: 4493101 (1985-01-01), Muraoka et al.
patent: 4525856 (1985-06-01), Admiraal et al.
patent: 4539690 (1985-09-01), Speidel
patent: 4543453 (1985-09-01), Brander
patent: 4548082 (1985-10-01), Engebretson et al.
patent: 4621172 (1986-11-01), Kanemasa et al.
patent: 4629829 (1986-12-01), Puhl et al.
patent: 4637402 (1987-01-01), Adelman
patent: 4658426 (1987-04-01), Chabries et al.
patent: 4707824 (1987-11-01), Kanemasa
patent: 4731850 (1988-03-01), Levitt et al.
patent: 4752903 (1988-06-01), Iwata et al.
patent: 4769808 (1988-09-01), Kanemasa et al.
patent: 4783818 (1988-11-01), Graupe et al.
Hearing Instruments, "Active Filtering--A Step Toward the Programmable Hearing Aid", vol. 33, No. 10, Oct. 1982, pp. 20+.
Oppenheim et al., Digital Signal Processing (1975), pp. 136-173, 268-269, 438-444, with face sheets.
MacWilliams et al., "Pseudo-Random Sequences and Arrays", Dec. (1976), pp. 1715-1729, Proceedings of the IEEE, vol. 64.
Widrow et al., "Adaptive Noise Cancelling: Princples and Applications", (1976?), 25 pps., unnumbered.
Shichor et al., "Adaptive Linear Prediction Using a Sign Decorrelator", (1977), IEEE Trans. Acous., Speech, & Signal Proces., 6/77, pp. 262-264.
Rabiner et al., Digital Processing of Speech Signals (1978), cover, face sheets, pp. 18-31.
Schroeder, "Integrated-Impulse Method Measuring Sound Decay Without Using Impulses", J. Acoust. Soc. Am., (1979), pp. 497-500.
Meade, Introduction to VLSI Systems, Adison-Wesley Series in Computer Science, (1980), face sheets, pp. 60-80, plates 1-8, pp. 81-85, 91-114, plates 9-15, pp. 155-164.
Duttweiler, "Adaptive Filter Performance with Nonlinearities in the Correlation Multiplier", IEEE Trans. Acoust., Speech, & Signal Proces., vol. ASSP-30, #4, 8/82.
Larson, "Studies in Acoustic Feedback in Hearing Aids", Rehabilitation R&D Progress Reports, 1985, pp. 304-305.
Weaver et al., "Electronic Cancellation of Acoustic Feedback to Increase Hearing-Aid Stability", J. Acoust. Soc. Am. Suppl. 1, vol. 77, Spring 1985, p. S105.
Egolf et al., "Studies in Acoustic Feedback in Hearing Aids", Rehabiliation R&D Progress Reports, 1986, p. 315.
Xue et al., "Adaptive Equalizer Using Finite-Bit Power-of-Two Quantizer", Trans. Acoust. Speech & Signal Proces., vol. ASSP-34, #6, Dec. 1986, pp. 1603-1611.
Egolf, "Review of the Acoustic Feedback Literature from a Control Systems Point of View", (undated), pp. 94-103.
Engebretson et al., "A Wearable, Pocket-Sized Processor for Digital Hearing Aid and Other Hearing Prostheses Applications", 1986, pp. 1-4.
Morley et al., "A Multiprocessor Digital Signal Processing System for Real-Time Audio Applications", IEEE Trans. Acous., Speech & Signal Proces., vol. ASSP-34, #2, Apr. 19

Affiliated with

Also associated with

Rating

Electronic filters, hearing aids and methods does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic filters, hearing aids and methods, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic filters, hearing aids and methods will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1654570