Bose Corporation

Richard A Kirkpatrick

Robert Preston Parker

William R Short

Amar G Bose

A noise reducing AM receiver has a receiving stage for receiving an AM signal of carrier frequency separated from that in an adjacent channel by a predetermined spacing and that may have a noise component. A detecting stage is coupled to the receiving stage for detecting at least a first portion of the received AM signal. A filter is coupled to the detecting stage for extracting a spectral component from at least a first portion of the received AM signal. A noise detector is coupled to the filter for detecting the presence of a predetermined amount of noise in the spectral component and for providing a blanking control signal in the presence of at least the predetermined amount of noise. A first noise blanker is responsive to the blanking control signal to process at least one portion of the received signal in response to the control signal to reduce the audibility of the noise component.

Noise reducing

A vehicle radio receiver circuit includes two antennas for mounting on the vehicle. The antennas are significantly less than one quarter of a wavelength in length at the desired frequency of operation, and the outputs of the antenna elements are coupled to two inputs of an FM circuit and two inputs of an AM circuit, which includes summing circuitry. The FM circuit has an FM output for providing a received FM signal, and the AM circuit has an output for providing an AM signal that includes a sum of signals derived from the outputs of the antennas.

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Lynnfield, MA, United States of America

Richard A Kirkpatrick