Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1988-09-13
1989-07-25
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
341168, H03M 118
Patent
active
048518433
ABSTRACT:
Apparatus including an analogue-to-digital converter 26 having a given number of digits, includes a variable gain amplifier (23) for the input (VA) to the converter (26). If any one instantaneous value (21A) of the input (VA) is less than is necessary to saturate the converter (26), i.e. to use all the digits of the converter (26), the gain of the amplifier (23) is automatically set to amplify the instantaneous input (21A) to the extent necessary to saturate the converter (26). By such selective amplication of different outputs (VA), each instantaneous value (21A) is digitized by the full number of digits of the converter (26) and the resolution of the apparatus is the same for all inputs (VA) regardless of their magnitude. On the other hand the converter is not over-saturated such as could be the case if the different inputs (VA) were amplified by a common gain.
REFERENCES:
patent: 3754240 (1973-08-01), Milton
patent: 4375636 (1983-03-01), Stack et al.
International Zurich Seminar on Digital Communications, 12-15, Mar. 1974, Zurich/Switzerland.
Messen Steuern Regeln, vol. 18, No. 6, Jun. 1975 (Berlin, DD), P. Ernst: "Floating Point Analog/Digital Convectors".
Hoff Marc S.
Renishaw plc
Shoop Jr. William M.
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