Download e-book for kindle: Adaptive Signal Processing: Applications to Real-World by Jacob Benesty, Yiteng Huang

By Jacob Benesty, Yiteng Huang

ISBN-10: 3642055079

ISBN-13: 9783642055072

ISBN-10: 3662110288

ISBN-13: 9783662110287

By adaptive sign processing, we suggest, in most cases, adaptive ?ltering.In- recognized environments the place we have to version, establish, or song time-varying channels, adaptive ?ltering has been confirmed to be an e?ective and robust instrument. for this reason, this software is now in use in lots of di?erent ?elds. because the invention, by way of Widrow and Ho? in 1959, of 1 of the ?rst advert- tive ?lters, the so-called least-mean-square, many functions looked as if it would have the capability to take advantage of this primary idea. whereas the variety of - plications (using adaptive algorithms) has been (and retains) ?ourishing with time, due to numerous successes, the necessity for extra subtle adaptive algorithms grew to become visible as real-world difficulties are extra complicated and extra not easy. even supposing the idea of adaptive ?ltering is already a well-established subject in sign processing, new and more desirable techniques are came across each year via researchers. a few of these contemporary methods are mentioned during this publication. The objective of this e-book is to supply, for the ?rst time, a connection with the most popular real-world functions the place adaptive ?ltering strategies play a huge function. to take action, we invited best researchers in di?erent ?elds to c- tribute chapters addressing their speci?c subject of research. hundreds of thousands of pages wouldprobablynotbe enoughto describeallthe practicalapplicationsutil- ing adaptive algorithms. hence, we restricted the themes to a few very important purposes in acoustics, speech, instant, and networking, the place learn remains to be very lively and open.

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Step 0 is performed at initialization, while steps 1-3 are performed for each block of data. Step 1 of the algorithm provides a clamp on the norm of the adaptive filter coefficient vector to prevent excessive vector growth and the associated coloration and stability problems. Step 2 reduces the hearingaid gain to provide a further margin of stability if needed. The gain reduction in step 2 of the algorithm is intentionally left vague because the amount of gain reduction will depend on the hearing-aid compressor behavior and the audibility of the gain fluctuations introduced by the algorithm.

7, pp. 174–176, July 1998. 2 Adaptive Feedback Cancellation in Hearing Aids James M. com Abstract. In feedback cancellation in hearing aids, an adaptive filter is used to model the feedback path. The output of the adaptive filter is subtracted from the microphone signal to cancel the acoustic and mechanical feedback picked up by the microphone, thus allowing more gain in the hearing aid. In general, the feedback cancellation filter adapts on the hearing-aid input signal, and signal cancellation and coloration artifacts can occur for a narrowband input.

Feedback path magnitude frequency response for a telephone handset removed (dashed line) and placed near the ear (solid line) for a behind-the-ear (BTE) hearing aid connected to a vented earmold on a dummy head. amount of space available for the circuitry and the required battery life. 5 cm2 . 5 mA. These size and power considerations lead to a small digital signal processing (DSP) chip operating a low clock rate. Typical specifications for the DSP in a commercial digital hearing aid are a Harvard architecture with a processing speed of 2 to 4 million instructions per second (MIPS), approximately 1024 words of program memory, and 1024 words each of x- and y-data memory.

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