Pulse or digital communications – Repeaters – Testing
Patent
1980-08-18
1982-11-30
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
329110, 329122, 333 17R, 375 81, 375 86, H03D 306, H04L 2722
Patent
active
043618944
ABSTRACT:
A band-pass filter circuit comprising a band-pass filter for removing noise modulation components from an input signal comprising a carrier sine wave, a phase detector for detecting a phase difference between input and output signals of the band-pass filter, a loop filter supplied with the output from the phase detector, and automatic control means for effecting control by the output from the loop filter so that a difference between the frequency of the input sine wave and the center frequency of the band-pass filter is reduced to zero. For carrier recovery in a burst mode, the loop filter is selected for each particular case so that high-speed pulling-in is possible even if a narrow-band filter is employed as the band-pass filter for the removal of noise components. Also, high-speed and high-precision pulling-in is achieved when many bursts of different frequencies are applied in one frame period. Further, when common and individual frequency variations occur at the same time, high-speed pulling-in is also achieved for each burst.
REFERENCES:
patent: 2339633 (1944-01-01), Gilman
patent: 2976408 (1961-03-01), Colaguori
patent: 3217259 (1965-11-01), Kotzebue et al.
patent: 3278685 (1966-10-01), Harper
patent: 3281534 (1966-10-01), Dersch
patent: 3588752 (1971-06-01), Hirshfield
patent: 3718909 (1973-02-01), Greatbatch
patent: 4103244 (1978-07-01), Tan
patent: 4135164 (1979-01-01), Kurata
Katoh Tadayoshi
Kurihara Hiroshi
Fujitsu Limited
Safourek Benedict V.
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