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Abstract

A receiver for receiving an amplitude modulated signal with upper and lower sidebands, comprising: an independent sideband decoder for providing demodulated upper and lower sideband audio signals, a combiner for differentially combining the upper and lower sideband audio signals to provide a noise signal, a quality detector apparatus for providing upper and lower quality signals representative of undesired noise in the upper and lower sideband audio signals respectively, and a selector responsive to the quality signals for processing the upper and lower sideband audio signals to provide an output audio signal with reduced noise. The quality detector includes a correlator for correlating the noise and audio signal in the associated sideband to provide the quality signals. In another aspect of the invention, the receiver also comprises a plurality of band-pass filters for selectively transmitting spectral components of the upper and lower sideband audio signals in contiguous frequency bands, a corresponding plurality of said combiners, and a summer for summing the output audio signals provided by said selectors. The quality detectors and the selectors are associated with a respective band pass filter.

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First Claim