Patent ID: 6819911
Filing Date: 2004-11-16
Classification: H04B

Abstract:
A signal suppression system having an input and an output, a composite signal having desired and undesired signal components being applied to the input, the signal suppression system being adapted to provide an output signal at the output thereof with the undesired component suppressed therein, the signal suppression system including in combination:signal cancellation means having inverting and non-inverting inputs and an output; a first path between the input of the signal suppression system and said signal cancellation means, said first path providing said composite signal to one of said inverting and non-inverting inputs; and a second path between the input of the signal suppression system and the other of said inverting and non-inverting inputs of said signal cancellation means, said second path including a transmultiplexer means, said transmultiplexer means being adapted to respond to the undesired component to provide a cancellation signal to said other of said inverting and non-inverting inputs of said signal cancellation means so that said signal cancellation means can suppress said undesired component in the output signal thereof, wherein said transmultiplexer means includes: first demultiplexer means for separating said composite signal into channelized signals at multiple outputs thereof; undesired signal detector means adapted to sense the undesired signal component, said undesired signal detector means being coupled to said first demultiplexer means and providing a timing signal in response to the undesired signal component; switch means having input, output and control terminals, said input terminal of said switch means being coupled to said first demultiplexer means, said control terminal of said switch means being coupled to said detector means, said switch means being responsive to said timing signal to conduct said cancellation signal to said output terminal thereof; and multiplexer means coupling said output terminal of said switch means to said signal cancellation means, wherein said first demultiplexer means includes a first poly phase filter means coupled through a first Fast Fourier Transform means, said first demultiplexer means thereby being adapted to separate said input signal into a plurality of channelized signals having known center frequencies; and said multiplexer means includes a second Fast Fourier Transform means coupled through a second poly phase filter means, said multiplexer means combining said plurality of channelized signals into a single cancellation signal representing the undesired signal component.