Noise reduction circuit and method

Details Noise reduction circuit and method Noise reduction circuit and method

H - Electricity

04

B

179/2, 340/72

H04B 15/00 (2006.01) H03G 9/02 (2006.01) H04B 1/64 (2006.01)

Patent

CA 1218721

- 35 - ABSTRACT OF THE INVENTION There is disclosed an analog signal processing circuit (compandor) and a method for overcoming noise in a transmission medium by means of a composite compressor and composite expander. The composite compressor splits the frequency spectrum of the analog signal into two or more frequency components, compresses all of the frequency components in parallel with the same 3:1 integer compression ratio, combines the compressed frequency components to produce a compressed analog signal, and transmits the compressed analog signal on the transmission medium. The composite expander reconstructs the original analog signal by means of feedback loop which extracts one of the compressed frequency components from the compressed analog signal, expands that extracted compressed frequency component to produce an expanded frequency component, derives the other expanded frequency components from the first expanded frequency component, compresses the derived expanded frequency components which are used to extract the first compressed frequency component, and a combining circuit which combines the expanded frequency components to reconstruct the original analog signal.

457233

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