# US 8,787,844 B2 · Signal transceiving method, signal transceiver utilizing the signal transceiving method, network connection method and network device utilizing the network connection method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,844 B2 - Document ID: US8787844B2 - Status: Granted - Kind: B2 - Application number: 13/609,246 - Filed: 2012-09-10 - Published: 2013-03-21 - Granted: 2014-07-22 - Earliest claimed: 2011-09-16 - Assignees: Realtek Semiconductor Corp. - Applicants: Yuan-Jih Chu; Liang-Wei Huang; Ching-Yao Su; Ming-Feng Hsu - Inventors: Yuan-Jih Chu; Liang-Wei Huang; Ching-Yao Su; Ming-Feng Hsu - Web page: https://patentgrep.com/patent/US8787844B2 ## CPC - H04B 1/38: Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving - H04B 3/20: Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other - H04B 15/00: Suppression or limitation of noise or interference (by means associated with receiver H04B1/10) - H04B: TRANSMISSION ## Abstract A signal transceiving method, applied to a signal transceiver, includes: adjusting to approximate a value of a clock frequency of a signal to be transmitted from the signal transceiver to a value of a clock frequency of a received signal; performing an echo cancellation operation; computing a distance between a first certification code transmitted by the signal transceiver and a second certification code received by the signal transceiver; and stopping the echo cancellation operation when the distance is smaller than a threshold value. ## Claims ### Claim 1 A signal transceiving method applied to a signal transceiver, comprising: adjusting to approximate a value of a clock frequency of a signal to be transmitted from the signal transceiver to a value of a clock frequency of a received signal; performing an echo cancellation operation; computing a distance between a first certification code transmitted by the signal transceiver and a second certification code received by the signal transceiver; and stopping the echo cancellation operation when the distance is smaller than a threshold value. ### Claim 2 (depends on 1) The signal transceiving method of claim 1, further comprising: making the signal transceiver start a convergence operation; and stopping the echo cancellation operation and performing the convergence operation again when the convergence operation fails or the distance is smaller than the threshold value. ### Claim 3 (depends on 1) The signal transceiving method of claim 1, further comprising: before the step of adjusting to approximate the value of the clock frequency of the signal to be transmitted from the signal transceiver to the value of the clock frequency of the received signal is performed, using a timing recovery circuit of the signal transceiver to lock a value of a clock frequency of a transmitting signal of a target signal transceiver. ### Claim 4 (depends on 1) The signal transceiving method of claim 1, wherein each of the first certification code and the second certification code is a seed. ### Claim 5 A network connecting method applied to a network device, comprising: adjusting to approximate a value of a clock frequency of a signal to be transmitted from the network device to a value of a clock frequency of a received signal; performing an echo cancellation operation; computing a distance between a first certification code transmitted by the network device and a second certification code received by the network device; and stopping the echo cancellation operation when the distance is smaller than a threshold value. ### Claim 6 (depends on 5) The network connection method of claim 5, further comprising: making the network device and a target network device start a connecting operation; and stopping the echo cancellation operation and performing the connection operation again when the cancellation operation fails or the distance is smaller than the threshold value. ### Claim 7 (depends on 5) The network connection method of claim 5, further comprising: before the step of adjusting to approximate the value of the clock frequency of the signal to be transmitted from the network device to the value of the clock frequency of the received signal is performed, using a timing recovery circuit of the network device to lock a value of a clock frequency of a transmitting signal of a target network device. ### Claim 8 (depends on 5) The network connection method of claim 5, wherein each of the first certification code and the second certification code is a seed. ### Claim 9 A signal transceiver, comprising: a transmitting frequency-tracking circuit, arranged for adjusting to approximate a value of a clock frequency of a signal to be transmitted from the signal transceiver to a value of a clock frequency of a received signal; an echo canceller, arranged for performing an echo cancellation operation; a comparator, arranged for computing a distance between a first certification code transmitted by the network device and a second certification code received by the network device; and a control unit, arranged for stopping the echo cancellation operation when the distance is smaller than a threshold value. ### Claim 10 (depends on 9) The signal transceiver of claim 9, wherein a convergence operation is performed, where the echo cancellation operation is stopped and the convergence operation is performed again when the convergence operation fails or the distance is smaller than the threshold value. ### Claim 11 (depends on 9) The signal transceiver of claim 9, further comprising: a timing recovery circuit, arranged for locking a value of a clock frequency of a transmitting signal of a target transceiver before the transmitting frequency-tracking circuit adjusts to approximate the value of the clock frequency of the signal to be transmitted from the signal transceiver to the value of the clock frequency of the received signal. ### Claim 12 (depends on 9) The signal transceiver of claim 9, wherein each of the first certification code and the second certification code is a seed. ### Claim 13 A network device, comprises: a transmitting frequency-tracking circuit, arranged for adjusting to approximate a value of a clock frequency of a signal to be transmitted from the network device to a value of a clock frequency of a received signal; an echo canceller, arranged for performing an echo cancellation operation; a comparator, arranged for computing a distance between a first certification code transmitted by the network device and a second certification code received by the network device; and a control unit, arranged for making the echo canceller stop the echo cancellation operation when the distance is smaller than a threshold value. ### Claim 14 (depends on 13) The network device of claim 13, wherein a connecting operation is performed, where the control unit makes the echo canceller stop the echo cancellation operation and the network device perform the connecting operation again when the connecting operation fails or the distance is smaller than the threshold value. ### Claim 15 (depends on 13) The network device of claim 13, further comprising: a timing recovery circuit, arranged for locking a value of a clock frequency of a transmitting signal of a target transceiver before the transmitting frequency-tracking circuit adjusts to approximate the value of the clock frequency of the signal to be transmitted from the network device to the value of the clock frequency of the received signal. ### Claim 16 (depends on 13) The network device of claim 13, wherein each of the first certification code and the second certification code is a seed.