Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1990-12-13
1992-12-29
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
4552491, 4552511, H04B 116
Patent
active
051758822
ABSTRACT:
In order to effectively demodulate an incoming RF signal which takes the form of bursts in a satellite communications system using a Single Channel Per Carrier Demand Assigned Multiple Access (SCPC-DAMA) technique, a controller is provided which is operatively coupled to a down-converter and a demodulating section. In the event that the RF signal is a continuous signal, the controller routes an AGC signal, which is outputted from the demodulating section, to a first variable attenuator provided in the down-converter and applies a constant potential to a second variable attenuator within the demodulating section. On the other hand, in the event that the RF signal assumes the burst format, the controller retains a value of the AGC signal at the time when the RF signal undergoes the continuous-burst change and applies the retained value of the AGC signal to the first variable attenuator. The controller further allows the AGC signal to be applied to the variable attenuator while the RF signal takes the form of the bursts.
REFERENCES:
patent: 4330859 (1982-05-01), Takada
patent: 4553105 (1985-11-01), Sasaki
Eisenzopf Reinhard J.
NEC Corporation
Pham Chi H.
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