Seismic playback/monitor system

Details Seismic playback/monitor system Seismic playback/monitor system

1975-09-15

1977-09-13

Morrison, Malcolm A.

Communications: electrical

Audible indication

Percussion-type sound producer

235154, 340 155GC, H03K 1303

Patent

active

040486354

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 visible display such as an oscillogram or "wiggle trace" of selectively compressed dynamic amplitude range. The digital word occupying a number of binary digit or bit positions is in algebraic form .+-. AG-E; wherein A represents the mantissa or argument; G represents the radix or base of the number system used; and, E represents an exponent. Since the radxi G is constant the only binary digits or bits that need to be recorded are those bits representing the mantissa A and the exponent E. In reconverting the aforementioned digital data to analog form data for making an oscillogram, wiggle trace or other visible display the invention involves the selective compression of the dynamic amplitude range of analog signal and at the same time avoiding the introduction of serious distortions.

REFERENCES:
patent: 3673398 (1972-06-01), Loofbourrow
patent: 3684968 (1972-08-01), Carroll
patent: 3685046 (1972-08-01), Howlett
patent: 3863058 (1975-01-01), Savit
patent: 3872465 (1975-03-01), Loofbourrow

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