Digital induction logging tool including a floating point A/D

Details Digital induction logging tool including a floating point A/D Digital induction logging tool including a floating point A/D

1981-06-08

1983-10-25

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, 367 65, 367 66, 367 67, H03

Patent

active

044122071

ABSTRACT:
A floating point analog-to-digital converter for use in a digital induction logging tool is disclosed. Floating point samples of phase quadrature components of the receiver signal are obtained. Each sample contains a digital word representing the exponent of a floating point number and digital word representing its magnitude. A voltage-to-frequency converter produces an output frequency proportional to the magnitude of the component signal. The resulting frequency signal is counted over a predetermined time inverval. At the completion of each time interval, the count is shifted until a predetermined magnitude is reached. The number of shift pulses required to reach this magnitude represents the exponent. The resulting shifted count represents its magnitude.

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Harrison, Logarithmic Digital to Analog Converter, IBM Technical Disclosure, Bulletin, vol. 5, No. 5, 10/1962, pp. 30 & 31.

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