TH23480A - Combined AM and FM stereo receivers - Google Patents

Abstract

An improved combined AM and FM stereo receiver (100) is provided with a single processor (155) for eliminating arctangent distortion in FM and in AM processing the phase values from the arctangent (chemical formula) to determine (chemical formula). In addition, the radio contains a single discriminator circuit (161, 137, 139) in which, in FM, the discriminator tank circuit (137, 139) is used to convert frequency deviations into fundamental band noise, and in AM, the discriminator tank circuit is used as the frequency determination component for the intermediate band to fundamental band circuit.

Claims (6)

1. A radio for receiving FM stereo and AM stereo signals, with tools for arranging the FM fundamental band signal and tools for arranging the phase signal of the AM stereo fundamental band. It also has a single processor for eliminating arctangent distortion in both FM and AM modes, and processes the phase value from the arctangent (chemical formula) to determine (chemical formula). 2. A radio of claimant 1 with additional switching mechanism for controlling such radio. 3. The Radio of Claim 2, which has the aforementioned single processor, has first-rate gain in FM and second-rate gain in AM. 4. The radio of claim 3, in which the aforementioned single processor is further arranged to compensate for the gain slope, the first rate is tuned to compensate for the arctangent of the FM discriminator circuit. 5. The radio of claim 4, in which the aforementioned single processor is further arranged so that the slope of the second gain rate is tuned to compensate for the arc tangent in the received AM signal. 6. Radio of claim 2, in which such single processor contains a tangent generator in a manner consistent with the ''''Tangent Generator for AM Stereo'''' of Cherales J. Marik, U.S. Patent No. 4,278,839, issued 14 July 1981 (6 claims, 1 page, 1 image).