By Saeed V. Vaseghi
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Extra info for Advanced Signal Processing and Noise Reduction, 2nd Edition (Electrical Engineering & Applied Signal Processing Series)
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The encoder and decoder must be well matched and cancel out each other in order to avoid processing distortion. Dolby has developed a number of noise reduction systems designated Dolby A, Dolby B and Dolby C. These differ mainly in the number of bands and the pre-emphasis strategy that that they employ. Dolby A, developed for professional use, divides the signal spectrum into four frequency bands: band 1 is low-pass and covers 0 Hz to 80 Hz; band 2 is band-pass and covers 80 Hz to 3 kHz; band 3 is high-pass and covers above 3 kHz; and band 4 is also high-pass and covers above 9 kHz.
The received noise is time-dispersed and shaped by the channel, and can be considered as the channel impulse response. In general, the characteristics of a communication channel may be linear or non-linear, stationary or time varying. Furthermore, many communication systems, in response to a largeamplitude impulse, exhibit a non-linear characteristic. 4 Time and frequency sketches of: (a) an ideal impulse, (b) and (c) shortduration pulses. 5 Illustration of variations of the impulse response of a non-linear system with the increasing amplitude of the impulse.