Wave transmission lines and networks – Amplitude compression and expansion systems
Patent
1985-02-25
1987-03-03
Gensler, Paul
Wave transmission lines and networks
Amplitude compression and expansion systems
330280, 381106, H04B 164
Patent
active
046478760
ABSTRACT:
A noise reduction system compresses an input signal at a constant ratio in response to a control signal derived from the compressed signal. Added to the derived control signal is a counterfeit control signal which causes the compressor to mistrack when the compressed signal falls below a preselected threshold level. Thus, low level compressor output signals are increasingly deemphasized. A constant counterfeit control signal produces a logarithmic decrease in compressor output signal levels below the threshold point. The resulting compressed signal is used in two ways to enhance system noise reduction. First, the compressed signal is expanded at a constant ratio over all signal levels so that low level mistracked signals are further deemphasized and the system noise floor is lowered. Second, the expanded signal is fed to a filter having a variable bandwidth controlled by a signal derived from the compressed signal and responsive to compressed signal frequency and amplitude so that the filter is desensitized to input signal amplitude changes. A multistage filter control signal arrangement may be employed to provide variable cutoffs in more than one bandwidth.
REFERENCES:
patent: 3769612 (1973-10-01), Yamazaki
patent: 4182993 (1980-01-01), Tyler
patent: 4398158 (1983-08-01), Rodgers
patent: 4538297 (1985-08-01), Waller, Jr.
Catalano Frank John
Gensler Paul
LandOfFree
Extended response dynamic noise reduction system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Extended response dynamic noise reduction system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extended response dynamic noise reduction system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1019300