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US 4,054,840 AGranted
FM demodulator using multiplier to which delayed and undelayed input signals are applied
AssigneeSony Corporation
InventorTeruo Sato
Life of this patent
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Abstract
An FM signal demodulator including a multiplier having a pair of input terminals and an output terminal. A signal coupling circuit is connected between a circuit input terminal and one of the input terminals of the multiplier to couple an FM signal to the multiplier, and a delay line and a phase shifter are connected in cascade between the signal input terminal and the other input terminal of the multiplier. A low pass filter is connected to the output terminal of the multiplier to allow the demodulated signal to reach the circuit output terminal.
Claims7
An FM demodulator comprising:
- a. a signal input terminal supplied with a frequency modulated signal;
- b. a multiplier having a pair of input terminals and an output terminal;
- c. a low pass filter connected to the output terminal of said multiplier to filter the output signal of the multiplier;
- d. coupling means for coupling said signal input terminal to one of said input terminals of said multiplier;
- and
- e. a series circuit comprising a delay line and a phase shifter connected between said signal input terminal and the other of the input terminals of said multiplier.
3 more elements
Dependencies are inferred from the claim text.