Control arrangements for digital radio receivers

Details Control arrangements for digital radio receivers Control arrangements for digital radio receivers

1994-10-18

1997-09-02

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

375316, 4551822, 4551922, H04L 2706

Patent

active

056639899

ABSTRACT:
In a frequency modulated digital radio transmission system, frequency differences between transmitter and receiver which give rise to DC offsets at the output of the demodulator are countered for any one data transmission by establishing a frequency controlling or DC level controlling signal during a preamble sequence having a known constant DC component, such as the sequence 10101 - - - used for clock or data synchronization, and retaining that controlling signal substantially unaltered for use during the remainder of that data transmission.

REFERENCES:
patent: 4544894 (1985-10-01), Yoshida
patent: 4817195 (1989-03-01), Kubo et al.
patent: 4873702 (1989-10-01), Chiu
patent: 5109544 (1992-04-01), Mittel et al.
patent: 5335354 (1994-08-01), Koike
Patent Abstracts of Japan, Unexamined Applications, E Section, vol. 15, No. 506, Dec. 20, 1991, The Patent Office Japanese Government, p. 26, E 1148; & JP-A-03 220 823, Japan Radio.

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