Automatic frequency control for local oscillator used with an AM
Automatic IF tangent lock control circuit
Automatic LFE audio signal derivation system
Automatic mode detection in digital audio receivers
Automatic multi-system AM stereo receiver using existing single-
Automatic stereophonic manipulation system and apparatus for ima
Automatic stereophonic manipulation system and apparatus for ima
Automatic telephone switch for hearing aid
Automobile audiovisual system
Automotive audio reproducing apparatus
Automotive surround sound circuit background of the invention