发明名称 |
Ringing signal generator for a subscriber telephone set |
摘要 |
A ringing signal generator for a subscriber telephone set comprising a switch switching the input signal, followed by a phase shifter and two symmetrical amplifiers having a very high output impedance at rest. The lines are driven through isolating capacitors.
|
申请公布号 |
US4595797(A) |
申请公布日期 |
1986.06.17 |
申请号 |
US19840632464 |
申请日期 |
1984.07.19 |
申请人 |
THOMSON-CSF TELEPHONE |
发明人 |
GILLES, BERNARD;ROUX, RAPHAEL;PAULET, JOSE |
分类号 |
H04M19/04;(IPC1-7):H04M3/22 |
主分类号 |
H04M19/04 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|