公开(公告)号：WO0143415A3

公开(公告)日：2002-02-14

申请号：PCT/US0041071

申请日：2000-10-04

Applicant: 3COM CORP ,  MURPHY TIM ,  SARSOZA LLOYD ,  STASZAK MARTIN

Inventor： MURPHY TIM ,  SARSOZA LLOYD ,  STASZAK MARTIN

IPC: H04L27/26 ,  H04M3/18 ,  H04M3/30 ,  H04M11/06 ,  H04J1/12 ,  H04L1/00 ,  H04M3/22

CPC classification number: H04M11/062 ,  H04L27/2602 ,  H04M3/18 ,  H04M3/30

Abstract: A method for reducing audible noise in a telephone from a splitterless asymmetric digital subscriber line modem. The modem examines the shape of the power spectrum of fast retrain signals both when the telephone is on-hook and off-hook. By comparing the spectra, in particular the slopes of the spectra, the modem may determine the quality of the telephone that shares the telephone loop with the modem. The modem cuts back its transmitted power depending on the quality of the telephone by an amount that suppresses the audible noise in the telephone. In this manner, a customer may simultaneously use the telephone and the modem on the same telephone loop.

Abstract translation: 一种用于从无分路器非对称数字用户线调制解调器降低电话中的可听噪声的方法。 调制解调器检查电话挂机和摘机时快速重新训练信号功率谱的形状。 通过比较光谱，特别是光谱的斜率，调制解调器可以确定与调制解调器共享电话回路的电话的质量。 调制解调器根据电话机的质量将其发射功率减少一定量，从而抑制电话中的可听见的噪音。 以这种方式，客户可以在相同的电话回路上同时使用电话和调制解调器。