Multiplex communications – Wide area network – Packet switching
Patent
1979-05-21
1981-07-28
Stewart, David L.
Multiplex communications
Wide area network
Packet switching
370 74, H04J 105
Patent
active
042814081
ABSTRACT:
Level control arrangement for frequency-division multiplex signals, comprising an amplifying device having a variable gain factor, a circuit for transposing the frequency of the multiplex signal at the output of said arrangement in order to bring the frequency of the pilot signal to a low frequency; a low-pass filter for limiting the spectrum of the transposed signal; and analog-to-digital converter in the form of a uniform delta modulator, the input whereof is connected to the output of the low-pass filter. In a code converter this delta modulation signal is converted into either a PCM signal, or a DPCM signal, and the signal thus obtained is applied to a digital filter for selecting a signal which is characteristic of said pilot signal. The filtered signal is applied to a detector for detecting the peak values. The peak values obtained are applied to a comparison device for generating an error signal which sets the value of the gain factor of the amplifying device.
REFERENCES:
patent: 4009350 (1977-02-01), Cabet
patent: 4103110 (1978-07-01), Picquendar
Briody Thomas A.
Stewart David L.
Streeter William J.
U.S. Philips Corporation
Wright Laurence A.
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