System for audibly recognizing an aurally unclassifiable signal

Details System for audibly recognizing an aurally unclassifiable signal System for audibly recognizing an aurally unclassifiable signal

1975-04-30

1976-05-04

Claffy, Kathleen H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 60, 343 8, 340384E, 340258A, G10L 100, G01D 2104

Patent

active

039550508

ABSTRACT:
This invention relates to a system for audibly recognizing a received signal aurally unclassifiable because of its improper (not clearly bearable) time duration and/or the frequency band occupied thereby. The received signal may be a carrier wave, modulated in amplitude and phase in accordance with the amplitude and phase of a signal to be recognized. In such case, the system includes modulator means for deriving quadrature base-band signal components. The system also includes a signal-storage device, such as a signal recorder movable at one speed during storage of a received signal thereon and at a different speed during retrieval of the signal therefrom, and means for storing the quadrature signal components in the storage device as received. The detected signal is thus translated in frequency on readout, then further processed to derive two control signals: one to vary a VCO whose audible output is representative of the original signal; the other control signal to amplitude-modulate the output of the Voltage-Controlled Oscillator.

REFERENCES:
patent: 3021479 (1962-02-01), DiToro
patent: 3369228 (1968-02-01), Foster
patent: 3388398 (1968-06-01), Kratzer
patent: 3798644 (1975-03-01), Constant
patent: 3882495 (1975-05-01), Bolger
patent: 3887896 (1975-06-01), Ramstedt

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