Amplitude measurement of signals of different frequency

Details Amplitude measurement of signals of different frequency Amplitude measurement of signals of different frequency

1976-01-15

1977-05-17

Zazworsky, John

Registers

Coded record sensors

Particular sensor structure

23515022, 307351, 307358, 324103P, 328151, 329 50, 340 27AT, H03K 520, H03K 906

Patent

active

040244598

ABSTRACT:
The peak amplitudes of alternating components of a composite alternating signal are determined without separating the components from one another, where such components are of different frequencies but have substantially in-phase zero crossings at recurring intervals. In an instrument landing system for aircraft, 90 Hz and 150 Hz signals form the components of a composite modulating signal and the zero crossing points of both components are accurately controlled. The composite 90 and 150 Hz signal is examined by a circuit which produces a reference pulse at the zero crossing time of both component frequencies in the positive direction. The reference pulses maintain digital timing circuitry in synchronism with the 90 Hz and 150 Hz components, and the composite wave form is sampled at each frequency to synchronously detect the peak amplitude of each component in separate detector circuits.

REFERENCES:
patent: 3524994 (1970-08-01), Ritter
patent: 3789306 (1974-01-01), Hammerschlag

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