发明名称 |
MULTIPLEX MULTIFREQUENCY SIGNAL RECEIVER |
摘要 |
In a multifrequency signal receiver the presence of each of n possible input signal frequencies is tested, sequentially, for a time proportional to the period associated with the frequency. Testing is effected by sequentially changing the resistive magnitude n times in the feedback path of an active R-C filter. The signal filter thus performs the function of n conventional filters.
|
申请公布号 |
US3692953(A) |
申请公布日期 |
1972.09.19 |
申请号 |
USD3692953 |
申请日期 |
1970.12.18 |
申请人 |
BELL TELEPHONE LAB. INC. |
发明人 |
RALPH WILLIAM WYNDRUM JR. |
分类号 |
H04L27/30;H04Q1/453;(IPC1-7):H04M1/50;H04Q9/12 |
主分类号 |
H04L27/30 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|