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US 4,233,685 AGranted
Radio for receiving and reproducing information broadcast on the intermediate frequency
AssigneeFord Motor Company
InventorStephen C. Taylor
Life of this patent
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Abstract
A superheterodyne radio receiver which is simultaneously tuned to receive both signals selectively tuned within the general AM broadcast spectrum and signals transmitted at the intermediate frequency, as defined in the receiver. The receiver responds to predetermined coded signals on the broadcast intermediate frequency signal to inhibit the local oscillator in preference to subsequent information broadcast on the intermediate frequency.
Claims3
A radio receiver comprising:
- an antenna;
- a radio frequency amplifier for amplifying antenna received radio frequency signals of a selected frequency;
- a local oscillator for producing an oscillator signal of a frequency differing from the frequency of the selected radio frequency signals by a predetermined amount;
- a mixer for mixing the oscillator signal with the radio frequency signal to produce a radio frequency amplifier derived intermediate frequency signal;
- an intermediate frequency amplifier for amplifying the signal from the mixer;
- a detector producing audio frequency signals from the amplified signal from the mixer;
- wherein the intermediate frequency amplifier is also connected to amplify antenna received radio frequency signals at the intermediate frequency, and said receiver includes means for stopping and starting the production of radio frequency amplifier derived intermediate frequency signals to the intermediate frequency amplifier in response to predetermined signals transmitted at the intermediate frequency.
4 more elements
Dependencies are inferred from the claim text.