ECHO CANCELLATION DEVICE FOR FULL DUPLEX COMMUNICATION SYSTEMS
First Claim
1. An echo cancellation device for use in a full duplex communication system, wherein the full duplex communication system comprises a transmitter for transmitting a transmit signal and a receiver for receiving a receive signal, the echo cancellation device comprising:
- a filter for outputting a filtering signal according to the transmit signal;
an echo cancellation circuit electrically coupled to the filter for outputting an echo cancellation signal according to the filtering signal; and
at least an echo cancellation resistor electrically coupled to the transmitter, the receiver, and the echo cancellation circuit.
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Accused Products
Abstract
An echo cancellation device for a full duplex communications system is provided. The full duplex communication system has a transmitter for transmitting a transmit signal and a receiver for receiving a receive signal. The echo cancellation device has a filter for outputting a filter signal according to the transmit signal, an echo cancellation circuit connected to the filter for outputting an echo cancellation signal according to the filter signal, at least one echo cancellation resistor connected to the transmitter, the receiver, and the echo cancellation circuit, and an echo cancellation detection circuit for outputting a control signal according to an echo residue at the receiver to control the filter.
15 Citations
22 Claims
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1. An echo cancellation device for use in a full duplex communication system, wherein the full duplex communication system comprises a transmitter for transmitting a transmit signal and a receiver for receiving a receive signal, the echo cancellation device comprising:
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a filter for outputting a filtering signal according to the transmit signal;
an echo cancellation circuit electrically coupled to the filter for outputting an echo cancellation signal according to the filtering signal; and
at least an echo cancellation resistor electrically coupled to the transmitter, the receiver, and the echo cancellation circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An echo cancellation device for use in a full duplex communication system, wherein the full duplex communication system comprises a transmitter for transmitting a transmit signal and a receiver for receiving a receive signal, the echo cancellation device comprising:
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a filter for outputting a filtering signal according to the transmit signal;
an echo cancellation circuit electrically coupled to the filter for outputting an echo cancellation signal according to the filtering signal;
at least an echo cancellation resistor electrically coupled to the transmitter, the receiver, and the echo cancellation circuit; and
an echo residue detection circuit for outputting a control signal to adjust the filter according to an echo residue received by the receiver. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification