Log and antilog functions for video baseband processing

Details Log and antilog functions for video baseband processing Log and antilog functions for video baseband processing

1984-12-24

1986-09-30

Roskoski, Bernard

Communications: electrical

Audible indication

Percussion-type sound producer

H03M 500

Patent

active

046149350

ABSTRACT:
The log encoder includes means for determining a number r corresponding to the position of the most significant one in the respective input samples, and generating an equivalent binary value. To the binary value is added a predetermined value when the input samples are non-zero to generate m-bit binary values representing the m most significant bits of the output samples in the log domain. The log encoder further includes means for generating l-bit binary values corresponding to the bits to the right of the most significant one in the input samples. The m-bit binary values are concatenated with the l-bit binary values as the most and least significant bits, which concatenated values represent the output samples in the log domain. The process is essentially reversed to convert the binary values in the log domain back into the non-log domain.

REFERENCES:
patent: 3877026 (1975-04-01), Wintz et al.
patent: 3905028 (1975-09-01), Wintz et al.
patent: 4555768 (1985-11-01), Lewis, Jr. et al.
T. A. Brubaker et al., Multiplication Using Logarithms Implemented with Read-Only Memory, pp. 761-765.
J. N. Mitchell, Computer Multiplication and Division Using Binary Logarithms, pp. 512-517.
G. G. Apple et al., Log-Linear Companding-A Digital Companding Technique, pp. 1776-1777.
U.S. patent application Ser. No. 502,014 of Lewis, Jr. et al., Digital Signal Processing System Employing Logarithms to Multiply and Divide.

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