发明名称 |
DC SUPPRESSION FOR PCM MODEMS |
摘要 |
An improved DC compensation method for use in conjunction with telephony signalling. The method includes defining a frame that includes at least two n-bit codewords. An unsigned codeword is then identified within the frame by applying a rule to the codewords in the defined frame. Next, a sign bit is appended to the unsigned codeword, thereby producing a DC compensating codeword. The sign bit is selected based upon a weighting function of the linear values associated with previously transmitted codewords. The remaining unsigned codewords in the frame are assigned sign bits from user data.
|
申请公布号 |
CA2425421(A1) |
申请公布日期 |
1998.12.17 |
申请号 |
CA19982425421 |
申请日期 |
1998.06.05 |
申请人 |
3COM CORPORATION |
发明人 |
LERY, SCOTT A.;PARIZHSKY, VLADIMIR G.;WALDRON, MARK A.;NORRELL, ANDREW L. |
分类号 |
H03M1/10;H03M7/00;H04B3/00;H04L25/49;(IPC1-7):H04M11/06;H03K7/00 |
主分类号 |
H03M1/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|