Communication device and noise eliminating method
A technology of communication device and digital converter, which is applied in two-way sound reinforcement telephone system, line transmission parts, shaping network in transmitter/receiver, etc., can solve the problem of increasing production cost and increasing complexity of communication device design It can eliminate the components of echo and crosstalk, improve the design complexity, and reduce the dynamic range.
Active Publication Date: 2014-02-05
REALTEK SEMICON CORP
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In this way, it will cause the design complexity of the communication device to increase, leading to the problem that the production cost will increase
Method used
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[0033] Various embodiments of the communication device of the present invention will be described in detail below with reference to the accompanying drawings.
[0034] figure 2 A schematic diagram showing a communication device according to an embodiment of the present invention. The communication device 100 is applicable to figure 1 The receiving circuit Rx. The communication device 100 includes a calculator 110, a digital / analog converter 120, a level determination module 130, an analog front-end circuit (Analog Front-End) 140, an analog / digital converter (Analog to Digital Convertor, ADC) 150, and a rear end elimination module 160 .
[0035] The communication device 100 receives a reception signal SRX. In one embodiment, the received signal SRX may include the signal transmitted by the remote communication device and the noise components of echo (Echo) and crosstalk (Near-End Cross Talk, NEXT) carried by the signal.
[0036] The calculator 110 is used for subtracting ...
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The invention discloses a communication device and a noise eliminating method. The communication device comprises an electric level determining module, a digital / analog converter, an analog / digital converter and a rear end eliminating module. The electric level determining module receives estimation signals, and determines a plurality of voltage levels and a plurality of voltage strengths corresponding to the voltage levels according to the estimation signals to generate a first digital signal. The digital / analog converter receives the first digital signal, and converts the first digital signal into a pulse type analog signal according to the voltage levels and the voltage strengths. The analog / digital converter receives a first difference value signal generated through the subtraction between a receiving signal and the pulse type analog signal, and analog-to-digital conversion is conducted on the first difference value signal to generate a second digital signal. The rear end eliminating module figure outs an output disturbance response which is the same as the input disturbance response of the analog / digital converter according to the pulse type analog signal, and generates the estimation signals according to the output disturbance response and the second digital signal.
Description
[0001] This application is a divisional application of a patent application with an application date of September 1, 2010, an application number of 201010274208.4, and an invention title of "communication device and noise elimination method". technical field [0002] The invention relates to a communication device, in particular to a communication device capable of eliminating echo and crosstalk. Background technique [0003] figure 1 A schematic diagram showing a general communication device. The communication device 10 includes a transmission medium 11 , a hybrid circuit (Hybrid Circuit) 12 , a local sending circuit Tx, and a local receiving circuit Rx. Through the transmission medium 11, the communication device 10 and the remote communication device can perform signal transmission and reception. Generally, the local transmission circuit Tx includes a digital / analog converter (not shown), which converts the signal from digital to analog to generate a transmission signal...
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IPC IPC(8): H04B3/32H04M9/08H04L25/03
Inventor 黄亮维俞丁发曾达钦枋立玮
Owner REALTEK SEMICON CORP