H - Electricity – 03 – K
Patent
H - Electricity
03
K
332/32
H03K 7/06 (2006.01) H04L 27/12 (2006.01)
Patent
CA 1112308
PHF 79520 15 21.3.80 ABSTRACT: Frequency shift modulator. The frequency shift modulator comprises an operational amplifier connected so as to form an inte- grating circuit and followed by a bistable circuit hav- ing 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 am- plifier. 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 join- ed with the said other end of the first resistor. Fur- ther logic means are provided for applying a voltage equal or complementary to the said two-level voltage, deoending 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. Final- ly, a common resistor is connected between the joined ends of the three above-mentioned resistors and the in- put of the operational amplifier. Application: data transmission. Reference: Fig. 1.
349153
Boudault Robert
Pouzoullic Gerard
Telecommunications Radioelectriques Et Telephoniques T.r.t.
Van Steinburg C.e.
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