发明名称 |
FREQUENCY SHIFT MODULATOR |
摘要 |
The frequency shift modulator comprises an operational amplifier connected so as to form an integrating circuit and followed by a bistable circuit having trigger hysteresis for producing a two-level voltage which is applied to one end of a first resistor whose other end is coupled to an input of the operational amplifier. Logic means are provided for applying a voltage equal or complementary to the said two-level voltage, depending upon the level of the data signal, to one end of a second resistor whose other end is joined with the said other end of the first resistor. Further logic means are provided for applying a voltage equal or complementary to the said two-level voltage, depending on whether the desired modulated signal has either the one or the other central frequency, to one end of a third resistor whose other end is joined with the joined ends of the first and second resistors. Finally, a common resistor is connected between the joined ends of the three above-mentioned resistors and the input of the operational amplifier. |
申请公布号 |
DE3061310(D1) |
申请公布日期 |
1983.01.20 |
申请号 |
DE19803061310 |
申请日期 |
1980.03.31 |
申请人 |
TELECOMMUNICATIONS RADIOELECTRIQUES ET TELEPHONIQUES T. R. T. |
发明人 |
BOUDAULT, ROBERT;POUZOULLIC, GERARD SOCIETE CIVILE S.P.I.D. |
分类号 |
H04L27/12;(IPC1-7):H04L27/12 |
主分类号 |
H04L27/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|