Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Patent
1984-09-28
1986-08-19
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
455214, 455260, 455263, 455265, 381 13, 331 11, H04B 126, H04H 500
Patent
active
046073930
ABSTRACT:
An FM receiver for demodulating an RF carrier signal containing a pilot frequency signal is provided. The receiver includes first and second frequency control loops. The first frequency control loop selects the local oscillator signal frequency. The reference signal oscillator in the first frequency control loop forms a part of a second frequency control loop. The second frequency control loop locks the phase of the reference signal oscillator with a detected pilot signal. In this way, the tuning signal of the local oscillator is kept phase locked to the detected pilot signal. Additional provisions are provided for changing the divisor of the second phase lock loop such that the time for establishing phase lock is reduced.
REFERENCES:
patent: 3622913 (1971-11-01), Shipley
patent: 4273958 (1981-06-01), Hirata
patent: 4370520 (1983-01-01), Malchow
patent: 4387470 (1983-06-01), Maurer et al.
patent: 4451930 (1984-05-01), Chapman et al.
patent: 4454607 (1984-06-01), Ogita
patent: 4539707 (1985-09-01), Jacobs et al.
"Grundig Technische Informationen", No. 12, 1980.
"Logische Grundschaltungen".
Jansen Winfried
Nolde Wolfgang
Ng Jin F.
Streeter William J.
U.S. Philips Corporation
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