Communications: electrical – Selective – Having electron beam device
Patent
1976-03-08
1977-06-21
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
330 29, 330 86, 330144, G01V 124
Patent
active
040315045
ABSTRACT:
The compression portion of an instantaneous companding (compressing-expanding) system includes at least two and preferably four "bi-gain" amplifiers connected in cascade. Each bi-gain amplifier normally has a low-gain state and can be switched to a discrete high-gain state. A discrete reference voltage is provided to compare with the output of each amplifier. The amplifiers are initially switched to their low-gain states and the reference voltage corresponding to the first amplifier is selected. A comparator means makes a comparison between the system's output voltage and the selected reference voltage. The control means switches the first amplifier to its high-gain state or holds it in the low-gain state depending on the result of the comparison. By utilizing a different variable reference voltage and bi-gain amplifiers with two different amplification factors, the number of amplifiers and comparisons is significantly reduced. Noise-cancelling means are also associated with each amplifier to remove undesired DC noise signals from each amplifier.
REFERENCES:
patent: 3308392 (1967-03-01), McCarter
patent: 3636463 (1972-01-01), Ongkiehong
patent: 3688250 (1972-08-01), Howlett
patent: 3813609 (1974-05-01), Wilkes et al.
patent: 3919657 (1975-11-01), Howlett et al.
patent: 3919685 (1975-11-01), Haill
patent: 3988689 (1976-10-01), Ochi et al.
Birmiel Howard A.
Knox William A.
Western Geophysical Company of America
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