| 发明名称 |
Call progress detection circuitry and method |
| 摘要 |
There is disclosed a method and system for determining the progress of a calling connection. The system measures the peak voltage of the signals on the line and derives a ratio of these peak signals to the average value of the signal. From this ratio a determination is made as to the calling condition of the line.
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| 申请公布号 |
US5311588(A) |
申请公布日期 |
1994.05.10 |
| 申请号 |
US19930091467 |
申请日期 |
1993.07.13 |
| 申请人 |
INTERVOICE, INC. |
发明人 |
POLCYN, MICHAEL J.;CAVE, ELLIS K.;BARNETT, HOWARD S. |
| 分类号 |
H04M1/82;H04Q1/444;(IPC1-7):H04M1/00 |
主分类号 |
H04M1/82 |
| 代理机构 |
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