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US 4,393,274 AGranted
AM Stereo receiver
AssigneeTrio Kabushiki Kaisha
InventorYukihiko Miyamoto
Life of this patent
Estimating the term…
Abstract
An AM stereo receiver for receiving AM stereo broadcasting of an AM-PM or AM-FM system. Between an IF AM signal amplifier and an limiter is interposed a 5 or more frequency multiplier so that the frequency of a spurious signal radiated from the limiter may lie outside of the frequency range handled by the RF tuner.
Claims2
An AM stereo receiver comprising:
- an RF AM tuner for selecting and converting an RF AM stereo signal of an AM-PM or AM-FM system into an IF AM stereo signal;
- an IF AM signal amplifier for amplifying the IF AM stereo signal from the RF AM tuner;
- a frequency multiplier for frequency multiplying the IF AM stereo signal from the IF AM signal amplifier to obtain a frequency-multiplied IF AM stereo signal having a frequency higher than the maximum frequency of a signal handled by the RF AM tuner;
- A limiter for amplitude limiting the frequency-multiplied IF AM stereo signal from the frequency multiplier to obtain a frequency-multiplied IF PM or FM difference signal;
- a PM or FM demodulator for phase or frequency modulating the frequency-multiplied IF PM or FM difference signal from the limiter to obtain a difference signal;
- an AM demodulator for amplitude demodulating the IF AM stereo signal from the IF AM signal amplifier to obtain a sum signal;
- and
- a matrix circuit for deriving a right signal and a left signal from the difference signal from the PM or FM demodulator and the sum signal from the AM demodulator.
5 more elements
Dependencies are inferred from the claim text.