发明名称 |
METHOD AND SYSTEM FOR ANALYTICALLY COMPUTING AND USING AN ANSPCM SIGNAL |
摘要 |
A method and system for analytically and dynamically generating a repeatable digital probing signal representing an answer tone. The probing signal may conveniently be used by a modem to determine whether characteristics of the communication path between the modem and another end are sufficiently similar to these of a previous communication path, such that a shortened training sequence can be employed between two ends. When the modem initiates communication, the modem applies a predefined algorithm to dynamically generate a sequence of samples representing an answer tone signal. Next, the modem encodes the generated sequence of samples into a sequence of codewords and sends it to a second modem via a transmission path. When the second modem receives each codeword of the sequence, the second modem dynamically generates a respective codeword and compares it to the received codeword. Using the received sequence of codewords and the dynamically generated sequence of codewords, the second modem may determine whether a shortened training sequence may be employed.
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申请公布号 |
WO0137503(A9) |
申请公布日期 |
2002.07.25 |
申请号 |
WO2000US31808 |
申请日期 |
2000.11.17 |
申请人 |
3COM CORPORATION |
发明人 |
MUELLER, A., JOSEPH;ROSENLOF, JOHN |
分类号 |
H04M1/24;H04L1/00;H04L1/24;H04L5/14;H04L25/49;H04M11/00;(IPC1-7):H04L5/14 |
主分类号 |
H04M1/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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