| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an analog line terminal capable of correctly receiving signals from a corresponding party even when a line echo extending as much as hundreds of milliseconds occurs. <P>SOLUTION: Each signal level of plural input signals received via an analog line 20 connected to a communication network is compared with a signal level of a received signal received just before or with a history of signal levels of input signals received from a corresponding party terminal in the past by a level detection unit 13. If the former exceeds a threshold x-dB predetermined for a signal level of an input signal received just before or a second threshold y-dB predetermined for a history of signal levels of input signals received from the partner terminal in the past, the analog line terminal 1 abandons the input signal regarding the input signal as a line echo of a transmission signal transmitted by the analog line terminal 1, and causes a signal transmission reception unit 12 to perform reception processing on the signal whose signal level is within the threshold x-dB or the second threshold y-dB as proper input signals from the partner terminal. <P>COPYRIGHT: (C)2012,JPO&INPIT |
