Automatic equalization system in FM communication circuit

Details Automatic equalization system in FM communication circuit Automatic equalization system in FM communication circuit

1979-10-26

1981-11-03

Swann, III, Glen R.

Pulse or digital communications

Repeaters

Testing

375 14, H09B 1500

Patent

active

042989833

ABSTRACT:
An automatic amplitude and phase equalization system in an FM communication circuit, in which a pilot signal included in a baseband signal of a transmitted FM signal demodulated by an FM demodulator is extracted and frequency-multiplied, a high harmonic wave of the pilot signal generated in the baseband signal is phase-detected using the frequency-multiplied output as a reference signal, an amplitude equalizer provided before the FM demodulator is driven by a component included in the phase detected output and of the same phase as the reference signal, and a phase equalizer provided before the FM demodulator is driven by a component included in the phase detected output and orthogonal to the reference signal, whereby amplitude and phase characteristics of a transmission path of the FM signal are automatically equalized.

REFERENCES:
patent: 3434056 (1969-03-01), Becker
patent: 3670269 (1972-06-01), Starr et al.
patent: 3763359 (1973-10-01), Cho et al.
patent: 3921072 (1975-11-01), Sato
patent: 4125899 (1978-11-01), Kawai et al.
patent: 4146838 (1979-03-01), Takada

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