Seismic playback system

Details Seismic playback system Seismic playback system

1974-05-29

1981-07-14

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

042789648

ABSTRACT:
Hereinafter disclosed is methodology and apparatus for converting wide dynamic amplitude range digital data recorded in floating point digital word form, comprising a binary coded mantissa and a binary coded exponent, to an analog signal, or oscillogram, of selectively compressed and/or amplified dynamic amplitude range. The digital word, occupying a number of binary bit positions, is, in algebraic form, .+-.AG.sup.E ; where A represents the mantissa, or argument, G represents the base, or radix, of the number system used and E represents the exponent. Since the base G is constant, for example at 8, the only binary bits that need to be recorded are those representing the mantissa A and the exponent E. In reconverting the digital data to analog form for making an oscillogram, or wiggle trace, it is desired to selectively amplify and/or compress the dynamic range and, yet, at the same time avoid introducing serious distortion. The methodology employed to accomplish such reconversion is to change either, or both, the mantissa A and base, or radix, G in such a way that the dynamic range is compressed and, yet, any distortion thereby introduced is minimal. Apparatus for performing the aforesaid changes, among other things, is disclosed.

REFERENCES:
patent: 3239833 (1966-03-01), Gray
patent: 3303489 (1967-02-01), Krucoff
patent: 3396380 (1968-08-01), Ohashi
patent: 3573795 (1971-04-01), Bowers

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