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Adjustable echo eliminating apparatus for all duplex communication systems

A technology for echo cancellation and communication systems, applied in transmission systems, wired transmission systems, electrical components, etc., can solve problems such as signal distortion

Active Publication Date: 2005-08-17
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the operating voltage of the integrated circuit is reduced to a certain extent, the MOS transistor in the equivalent current source Ic (that is, the known echo cancellation circuit 110) may not work in the saturation region (SaturationRegion) in the known technology. situation, thereby causing the influence of signal distortion

Method used

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  • Adjustable echo eliminating apparatus for all duplex communication systems
  • Adjustable echo eliminating apparatus for all duplex communication systems
  • Adjustable echo eliminating apparatus for all duplex communication systems

Examples

Experimental program
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Embodiment Construction

[0036] please refer again image 3 . The present invention takes into consideration the unavoidable parasitic capacitance effect during actual circuit implementation, so the equivalent output impedance Zo is modified to be composed of the load resistance Re (composed of the matching resistance Rm and the equivalent resistance Rc of the channel) and the parasitic capacitance Ce Parallel connection (Zo=Re / / Ce). In the present invention, the size of the equivalent output impedance Zo is shown in the following equation:

[0037] Zo = Re sReCe + 1 - - - ( 4 )

[0038] Substituting equation (4) into equation (3), the following equation can be obtained:

[0039] Ic = - Re Rp + ...

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PUM

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Abstract

This invention relates to full duplex communication system echo cancellation device, wherein the system comprises one sending end to send one near end signal and one receiving end to receive one remote signal. The echo cancellation device comprises the following parts: one wave filter to output one filter signal according to the near end signal; one echo cancellation circuit coupled on the filter to output one echo cancellation signal according to the filter signals; at least one echo cancellation resistance coupled to the sending end, receiving end and the echo cancellation circuit, wherein the circuit comprises one lifting current source to lift the direct current level.

Description

technical field [0001] The invention relates to an echo canceling device, in particular to an echo canceling device used in a full-duplex (Full Duplex) communication system. Background technique [0002] Due to the advancement of technology, the application of the Internet has become more and more extensive. In view of the increasing requirement on the bandwidth of the network, the transmission speed of the data packet of the commonly used Ethernet (Ethernet) has also been increased from the previous 10 / 100 Mbps to more than 1 Gbps. As is well known in the industry, in a 1Gbps Fast Ethernet device, each connection port (Port) has four channels (Channel), and each channel has a transceiver. [0003] Please refer to Figure 1. FIG. 1 is a simplified schematic diagram of a known transceiver (Transceiver) 100 used in a channel of a Fast Ethernet device. Generally speaking, the transceiver 100 is coupled to a twisted pair (Twist Lines) 118 through a line interface (Line Interfa...

Claims

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Application Information

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IPC IPC(8): H04B3/23
Inventor 黄祯治陈慕蓉
Owner REALTEK SEMICON CORP
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