Level regulator of the digital type

Details Level regulator of the digital type Level regulator of the digital type

1975-10-06

1977-02-22

Stewart, David L.

179 15FD, 325405, H04J 116

Patent

active

040093506

ABSTRACT:
The invention concerns a level regulator for a frequency division multiplex group, having a variable gain network controlled basically by the observing of the amplitude of a pilot wave contained in the multiplex group, comprising a digital filter preceded by a sampling device and an analog-digital converter for extracting the pilot wave from the multiplex group downstream from the variable gain network, a calculation circuit connected to the digital filter for determining a number which is a function of the level, over a predetermined interval of time, of the pilot wave at the output of the filter, and a digital comparison element which compares that number with a reference value with a view to generating a control signal for the said network. In a particular embodiment of the invention, the multiplex group is transposed towards the low frequencies before being digitally processed.

REFERENCES:
patent: 3223783 (1965-12-01), Yamrmoto
patent: 3449525 (1969-06-01), Berry
patent: 3470480 (1969-09-01), Smart
patent: 3863030 (1975-01-01), Mills
patent: 3882283 (1975-05-01), Provofoot
patent: 3937899 (1976-02-01), Denenberg

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