Pilot signal transmission system

Details Pilot signal transmission system Pilot signal transmission system

1972-09-18

1976-05-25

Safourek, Benedict V.

325 49, H04B 168

Patent

active

039597261

ABSTRACT:
A pilot signal transmission system is disclosed for the transmission of a digital signal in the form of a multilevel amplitude signal. A synchronizing pilot signal, whose frequency is an integral fraction of the Nyquist frequency of a base band signal or equal to the carrier frequency of an amplitude modulated signal, is transmitted while being coupled in in-phase relation with composite vectors of those components of the digital signal lying in the neighborhood of the frequency of the pilot signal. The transmitted signal is applied to a receiver, wherein the components neighboring the pilot signal frequency are extracted substantially symmetrically with respect to the pilot signal frequency to reproduce the pilot signal and the level of the pilot signal at the time of multilevel decoding is cancelled by a signal of a waveform having a constant amplitude for a certain period of time such as a rectangular, trapezoidal or like wave of a period corresponding to that of the pilot signal.

REFERENCES:
patent: 2835889 (1958-05-01), Dyer et al.
patent: 3147437 (1964-09-01), Crafts et al.
patent: 3196352 (1965-07-01), Hopner et al.
patent: 3229209 (1966-01-01), Critchlow et al.
patent: 3289082 (1966-11-01), Shumate
patent: 3312901 (1967-04-01), Becker et al.
patent: 3588702 (1971-06-01), Tisi

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