Method and device for discriminating difference frequency of two

Details Method and device for discriminating difference frequency of two Method and device for discriminating difference frequency of two

1979-01-29

1981-08-25

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307525, H03K 526

Patent

active

042862205

ABSTRACT:
In a method for discriminating the frequency difference of two pulse trains, the pulses of one train are separated into odd and even pulses, while in the second train every second pulse is separated. Then, every second pulse is checked for coincidence with even or odd pulses and, once such a coincidence occurs, the next check is for coincidence with, respectively, odd or even pulses, the frequency of such coincidences being representative of the frequency difference. In a device for discriminating the frequency difference of two pulse trains, a circuit for comparing one train with the other includes a separator of even and odd pulses, whose input serves as one of the inputs of the device. The circuit also includes two AND gates having their first inputs connected to the outputs of the separator, an OR gate having its inputs coupled to the outputs of the two AND gates, an additional AND gate whose output serves as an output of the device and whose first input is connected to the OR gate, a two-to-one pulse frequency divider whose input serves as the other input of the device and whose output is connected to the second input of the AND gate, and a flip-flop connected to the output of the additional AND gate and having its outputs connected to the second inputs of the first two AND gates, the outputs of the flip-flop serving as the other outputs of the device.

REFERENCES:
patent: 3526841 (1970-09-01), Holmboe et al.
patent: 3588710 (1971-06-01), Masters
patent: 3961203 (1976-06-01), Hutch

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