Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1979-03-13
1980-05-27
Grimm, Siegfried H.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
328 14, 328150, 330 10, 332 23R, 332 44, 332 48, 370 7, H03C 152, H03C 300, H03F 338, H03K 13175
Patent
active
042052416
ABSTRACT:
A system for modulation of the amplitude of a d-c voltage, the amplitude of an a-c carrier, or the frequency of an a-c carrier by signal, in which the signal amplitude is continuously compared against a predetermined series of equally-spaced d-c voltages, and coincidence-sensing and switching means associated with each d-c voltage connects a corresponding d-c voltage to the output circuit in the case of an instantaneous compressor, an instantaneous expandor or a signal amplifier, connects a carrier of corresponding amplitude to the output circuit in the case of an amplitude modulator, and connects a carrier of corresponding frequency to the output circuit in the case of an angle modulator.
REFERENCES:
patent: 3365623 (1968-01-01), Stacey
patent: 3430151 (1969-02-01), Badessa
patent: 3585631 (1971-06-01), McCown
patent: 4153882 (1979-05-01), Fisher et al.
H. S. Black, "Modulation Theory", New York, 1953, pp. 37, 41, 56, 57.
S. Prigozy, "Zero-Crossing Detector Provides Fast Sync Pulses", Electronics, Apr. 19, 1965, p. 91.
"Transmission Systems for Communications", Bell Telephone Laboratories, 1971, pp. 102, 120-122, 127, 128, 571-583.
Fisher Charles B.
Fisher Sidney T.
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