Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1974-10-25
1976-11-02
Stellar, George G.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
325 65, 328163, 333 17R, H04B 1500
Patent
active
039898970
ABSTRACT:
Unwanted background noise in audio signals, and particularly in musical material, is significantly reduced by a multiple band dynamic filtering system operated in response to the fundamental and harmonic content and degree of correlation or nonrandomness of the audio signal. A plurality of voltage controlled band-pass gates or filters are established in the audio signal path for individually and selectively passing frequency content of the audio signal falling within each frequency band. The fundamental and harmonic content of the signal, typically a musical composition, is detected by a corresponding plurality of band-pass signal detectors, the outputs of which are connected to and for operating associated band-pass gates. Normally the band-pass gates are closed blocking any background noise present on the incoming signal. The band-pass detectors sense the presence of any fundamental or harmonic signal content and cause the appropriate band-pass gates to open and pass the full frequency content of the musical signal. The degree of correlation or nonrandomness of the audio signal is automatically monitored and the threshold detection of the presence of signal content in any one of the given frequency bands is varied in accordance with the degree of signal correlation.
REFERENCES:
patent: 3180936 (1965-04-01), Schroeder
patent: 3403224 (1968-09-01), Schroeder
patent: 3747703 (1973-07-01), Knowd et al.
patent: 3803357 (1974-04-01), Sacks
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