| 摘要 |
PCT No. PCT/US82/00102 Sec. 371 Date Jan. 26, 1982 Sec. 102(e) Date Jan. 26, 1982 PCT Filed Jan. 26, 1982 PCT Pub. No. WO83/02700 PCT Pub. Date Aug. 4, 1983.A signal processing system is disclosed 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, although not a compressor or compandor 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 combiner is used to recombine the harmonically related constituents delivered by the second compressor circuit, and thus retrieve the dynamically varying intelligence-carrying signals. Thus, 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 compressing of the original signal constituents to permit dynamic variation of the processed signal constituents. The processed signal constituents are recombined to reproduce the intelligence-carrying signals, recovering original frequencies quite beyond the pass band. |
