发明名称 |
DISTINGUISHING RECEIVED A-LAW AND mu -LAW SIGNALS IN A PCM MODEM |
摘要 |
A method in a modem having a frame having a plurality of slots, for determining whether incoming DIL sequence information contains A-law or mu-law is provided. From the DIL sequence information, an ordered table of levels for each slot is generated. The levels of all non-robbed-bit slots are averaged, and average levels are subjected to an A-law/mu-law separation function. The separation function F1(n1,n2)=sum from i=n1 to i=n2 {L(i) - 2* [L(i-16]} effectively compares values of a first plurality of levels L(i) to twice the values of a second plurality of levels sixteen levels removed from the first plurality of levels (420). The sum is compared to a threshold (430), as the sum will be small for A-law values and large for mu-law values.
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申请公布号 |
WO0045525(A1) |
申请公布日期 |
2000.08.03 |
申请号 |
WO2000US01142 |
申请日期 |
2000.01.18 |
申请人 |
PCTEL, INC. |
发明人 |
OKUNEV, YURI;DRUCKER, VITALY;WANG, QIN;GOLDSTEIN, YURI |
分类号 |
H03M7/50;H04B14/04;H04J3/12;H04L25/49;(IPC1-7):H04B1/38;H04L23/00;H04L23/02;H04L27/04;H04L27/10;H04L27/20;H04L27/36 |
主分类号 |
H03M7/50 |
代理机构 |
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主权项 |
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地址 |
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