Pulse or digital communications – Receivers – Automatic gain control
Patent
1995-07-21
1997-12-02
Tse, Young T.
Pulse or digital communications
Receivers
Automatic gain control
375355, 330278, 34031004, 34031008, 4552342, H04L 2706, H04M 1104
Patent
active
056944365
ABSTRACT:
This invention relates to a gain control system for handling periodic noises to facilitate receiving of data signals in a noisy environment such as a powerline. The gain control system includes a period detector for detecting periods of the periodic noises and generating a SYNC signal for each detected period; a signal converter for digitizing the input signals; signal analyzing means for analyzing the digitized input signals received between two SYNC signals and generating a gain control table for flattening the periodic noises contained between two SYNC signals; a gain controller for amplifying the input signals; and a control signal generator for generating a sequence of gain control signals according to the gain control table after each SYNC signal to control the gain controller whereby the periodic noises contained between each pair of SYNC signals are flattened by the gain controller. The gain control system of the present invention can effectively catch and amplify those periodic noises without using real time monitoring and real time feed back techniques and thus can greatly reduce the implementation and operational costs of a traditional digital gain control system used in the same environment.
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Hsueh Yu-Heng
Huang Shih-Wei
Chaw Khong Co., Ltd.
Tse Young T.
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