System for crosstalk noise reduction on twisted pair, ethernet, polyphase and shielded wire systems
First Claim
1. An crosstalk noise reduction system comprising:
- a first stage, comprising passive crosstalk noise reduction circuits operating on signals from a transmission media;
a second stage, comprising active crosstalk noise reduction circuits and multiple feedback loops; and
a third stage, comprising a digital signal processor.
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Abstract
The present invention is an electronic circuit that reduces crosstalk in communications systems employing twisted pair, Ethernet, polyphase or shielded wire transmission media. The present invention includes three stages of crosstalk noise reduction. Stage 1 filters common mode noise from the transmission media and balances the resistive and reactive parasitic electrical characteristics of the transmission media that couple each line to the local ground over the operating frequency band. The second Stage performs differential crosstalk noise reduction in real time using multiple feedback loops. It can dynamically locate and set optimal system operating conditions for minimal differential crosstalk coupling for the specific environmental and interfering channel utilization conditions. The third Stage utilizes digital signal processing techniques to further reduce any residual crosstalk after analog-to-digital conversion. The third Stage also functions as a digital controller for the entire system as well as portions of subsystems including the feedback loops of Stage 2.
28 Citations
10 Claims
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1. An crosstalk noise reduction system comprising:
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a first stage, comprising passive crosstalk noise reduction circuits operating on signals from a transmission media;
a second stage, comprising active crosstalk noise reduction circuits and multiple feedback loops; and
a third stage, comprising a digital signal processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification