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| Methods and arrangements in a radio communications system |
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| Efficient handling of connections in a mobile communications network |
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| Telecommunications network broadcasting of service capabilities |
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| Implicit resource allocation in a communication system |
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Seismic playback system
| Details |
Inventors: Armistead, Fontaine C.;
Assignee: Texaco Development Corporation (New York, NY)
Primary Examiner: Miller; Charles D.
Assistant Examiner:
Attorney, Agent or Firm: Whaley; T. H., Ries; C. G., Gillespie; Ronald G.
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 compressed dynamic amplitude range. The digital word, occupying a number of binary bit positions, is, in algebraic form, .+-.AG.sup..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 at 8, for example, 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 proposed to compress the dynamic range and, yet, at the same time avoid introducing serious distortion. Apparatus for performing the aforesaid changes, among other things, is disclosed. |
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DETAILED DESCRIPTION One object of the present invention is to convert data from a digital form to an analog form.
Another object of the present invention is to provide new and useful methodology for converting data from digital form to analog form.
Another object of the present invention is to provide new and useful apparatus for converting data from digital form to analog form.
Another object of the present invention is to convert wide dynamic amplitude range digital data, e.
g.
, seismic data, to analog form oscillograms, or wiggle traces.
Another object of the present invention is to convert wide dynamic amplitude range digital data to analog form data, such as oscillograms, which oscillograms are attenuated reproductions of wide dynamic amplitude range analog signals extant prior to their conversion to said digital data.
Another object of the present invention is to convert wide dynamic amplitude range digital form data to analog form data having attenuated amplitudes without introducing serious distortion.
Briefly, in accordance with the invention a recorded floating point digital word, occupying a number of binary bit positions, and having the general algebraic form .
+-.
AG.
sup.
-.
sup.
E (equation 1) is converted to a different algebraic form in order to produce corresponding analog signals having a range of amplitudes which are attenuated.
Other objects as well as the various features and advantages of the invention will become apparent from the following description when considered in connection with the accompanying drawings which form a part of this specification.
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