发明名称 |
Ringing signal generator |
摘要 |
A telephone ringing signal generator which sequentially produces a plurality of ringing signals each of a different frequency. Each of a plurality of tone ringers connected to the generator will ring only in response to it's particular frequency. A programmable oscillator generates the required frequencies under control of a time slot generator which defines the time slot during which each frequency is to be generated.
|
申请公布号 |
US4282410(A) |
申请公布日期 |
1981.08.04 |
申请号 |
US19790028622 |
申请日期 |
1979.04.09 |
申请人 |
GTE AUTOMATIC ELECTRIC LABS INC. |
发明人 |
GAUTHIER, JOHN A.;SHAVER, DAVID M. |
分类号 |
H04M19/02;H04Q5/10;(IPC1-7):H04M5/00 |
主分类号 |
H04M19/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|