H - Electricity – 04 – B
Patent
H - Electricity
04
B
179/2
H04B 1/66 (2006.01) H03G 7/08 (2006.01)
Patent
CA 1207241
ABSTRACT A signal processing system for processing dynamically varying intelligence-carrying signals represented by different frequencies by transferring these signals within a pass band narrower than the range of the frequencies. The system makes use of a compressor circuit for compressing only signals within a predefined pass band. Active filter circuits shape the compressed signals into a predetermined power envelope having fundamental frequency signal components and harmonically related constituents of the fundamental frequencies. Another compressor circuit is used for further compressing signal constituents of the power envelope. A negative feedback arrangement provides dynamic limiting of compression by the first compressor circuit as a function of increase of compression by the second compressor circuit. A linear combiner is used to recombine the harmonically related constituents delivered by the second compressor circuit, and thus retrieve the dynamically varying intelligence-carrying signals. The system involves a new method of signal processing involving first defining a range of original signal constituents to be processed including signal fundamentals and harmonically- related components of said fundamentals and then primarily dynamically compressing the range of original signal constituents. Signal component amplitudes of the dynamically compressed signal are selectively controlled to define a power envelope which is further dynamically compressed to provide processed signal constituents, but while providing time-delayed limiting of com- pressing of the original signal constituents. The processed signal constituents are linearly recombined to reproduce the intelligence-carrying signals, recovering original frequencies quite beyond the pass band.
436597
Meredith & Finlayson
Metme Communications A. Partnership
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