Wave transmission lines and networks – Transmission line inductive or radiation interference...
Patent
1990-09-10
1991-09-10
Gensler, Paul
Wave transmission lines and networks
Transmission line inductive or radiation interference...
333 171, 381 71, H04B 728, H03B 2900
Patent
active
050477366
ABSTRACT:
Devices and methods for selectively reducing an electromagnetic or acoustic interference present in a transmission line by an active adaptive means, are described. For the electromagnetic interference, the transmission line may include a waveguide carrying a desired signal along with an undesired interference, the objective of the invention being to reduce the interference selectively at the output of the transmission line without affecting the desired signal substantially. Similarly, for an acoustic interference, the transmission line may include an exhaust pipe of an auto or Diesel engine carrying an undesired acoustic interference or noise, the objective of the invention being to reduce this noise at the output of the pipe. The selective interference reduction in this invention is achieved by sampling the interference almost exclusively from the transmission line, and automatically synthesizing a cancelling interference which, when summed with the interference present in the transmission line, cancels or substantially reduces the interference at the transmission line output. A closed-loop control is used to reverse the polarity and to adjust the amplitude and phase of the cancelling interference until the sum of the synthesized cancelling interference, and that to be reduced in the transmission line, becomes a minimum.
REFERENCES:
patent: 4128848 (1978-12-01), Nakagawa
patent: 4473906 (1984-09-01), Warnaka et al.
Gensler Paul
Ghose Rabindra N.
Technology Research International, Inc.
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