Gain control system for handling periodic noises
First Claim
1. A gain control system for handling periodic noises contained within input signals comprising:
- (1) synchronization means for sensing periods of the periodic noises and generating SYNC signals which are synchronous with the periodic noises;
(2) a signal converter for digitizing the input signals;
(3) signal analyzing means for analyzing the digitized input signals received after a plurality of SYNC signals and generating a gain control table for flattening the periodic noises contained between two SYNC signals;
(4) a gain controller for amplifying the input signals;
(5) a control signal generator for generating 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.
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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.
58 Citations
18 Claims
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1. A gain control system for handling periodic noises contained within input signals comprising:
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(1) synchronization means for sensing periods of the periodic noises and generating SYNC signals which are synchronous with the periodic noises; (2) a signal converter for digitizing the input signals; (3) signal analyzing means for analyzing the digitized input signals received after a plurality of SYNC signals and generating a gain control table for flattening the periodic noises contained between two SYNC signals; (4) a gain controller for amplifying the input signals; (5) a control signal generator for generating 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A gain control method for handling periodic noises contained within input signals, the gain control method comprising the steps of:
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(1) detecting periods of the periodic noises and generating a plurality of SYNC signals which are synchronous with the periodic noises; (2) digitizing the input signals; (3) analyzing the digitized input signals received after a plurality of SYNC signals and generating a gain control table for flattening the periodic noises contained between two SYNC signals; (4) generating a sequence of gain control signals according to the gain control table after each SYNC signal to control a gain controller which is used for amplifying the input signals whereby the periodic noises contained between two SYNC signals are flattened by the gain controller. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A gain control system for handling periodic noises contained within input signals comprising:
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(1) synchronization means for sensing periods of the periodic noises and generating SYNC signals which are synchronous with the periodic noises; (2) a signal converter for converting the input signals; (3) signal analyzing means for analyzing the converted input signals received after a plurality of SYNC signals and generating a gain control table for flattening the periodic noises contained between two SYNC signals; (4) a gain controller for amplifying the input signals; (5) a control signal generator for generating 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.
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Specification