Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1974-09-13
1976-10-26
Claffy, Kathleen H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 8, 179 1555R, G10L 102
Patent
active
039885461
ABSTRACT:
According to the present invention, a system for audibly recognizing a received signal which is aurally unclassifiable because it is too short or too long in its duration and/or its frequency band is too wide or too narrow, such as occurs in sensor systems, for example, infiltration radars, comprises a signal-storage device such as a magnetic tape recorder/reproducer and motor means for driving the tape at one speed during recording or storage of a received signal and at a different speed, for example a lower speed, during reproducing or retrieval of the signal therefrom. The storage device has means for storing the signal therein as received and means for retrieving the signal from the storage device at a time-rate different from the storing rate, for example a slower rate. Coupled to the tape unit are a plurality of narrow band-pass filters collectively spanning the frequency band of the signal retrieved from the storage device, a plurality of tone generators of audibly distinguishable frequencies, and means responsive to the amplitude of the signal ouput of each of the filters for individually adjusting the amplitude of the signal output of a corresponding one of the tone generators, thus deriving from the signal retrieved from the tape unit a plurality of signals each of a duration and frequency band within the range of audible recognition. The system further includes an output circuit, such as a sound transducer, coupled collectively to the tone generators.
REFERENCES:
patent: 3030450 (1962-04-01), Schroeder
patent: 3127476 (1964-03-01), David
patent: 3409743 (1968-11-01), Greefkes
patent: 3431356 (1969-03-01), Copel
patent: 3510590 (1970-05-01), Golla
patent: 3584158 (1971-06-01), Jefferies
patent: 3643028 (1972-02-01), Cleveland
patent: 3855424 (1974-12-01), Tharmaratnam
Claffy Kathleen H.
Dobbs Laurence B.
General Signal Corporation
Kemeny E. S.
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