FSK signal receiver

Details FSK signal receiver FSK signal receiver

1995-11-01

1998-07-14

Tse, Young T.

Pulse or digital communications

Receivers

Angle modulation

375225, 375324, 375345, 329300, H04L 2714

Patent

active

057815887

ABSTRACT:
An FSK signal receiver includes an amplifier which amplifies a first FSK signal at an adjustable gain. A frequency converter converts an output signal from the amplifier into a second FSK signal having a frequency lower than a frequency of the first FSK signal. A demodulator demodulates the second FSK signal into a baseband signal. A bit-state detector detects a bit state from the baseband signal in response to a threshold. A calculator calculates a number of times of occurrence of a fact that the baseband signal moves across the threshold during a given time. The gain of the amplifier is adjusted in response to the number of times which is calculated by the calculator.

REFERENCES:
patent: 4328587 (1982-05-01), Mizuno et al.
patent: 4897857 (1990-01-01), Wakatsuki et al.
patent: 5208835 (1993-05-01), Weeks
patent: 5311554 (1994-05-01), Morera et al.
patent: 5323425 (1994-06-01), Colamonico
patent: 5455536 (1995-10-01), Kono et al.
patent: 5561673 (1996-10-01), Takai et al.
patent: 5621767 (1997-04-01), Brandt et al.

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