Coded data generation or conversion – Digital code to digital code converters
Patent
1996-04-26
1997-12-30
Gaffin, Jeffrey A.
Coded data generation or conversion
Digital code to digital code converters
341 67, 348398, H03M 700
Patent
active
057035792
ABSTRACT:
In an encoder for decoding compression data obtained by conducting a compression encoding for digital data through subband division, logarithmic compression, and variable-bit-length quantization, an exponent of an exponent operation is separated into an integer part and a fraction part to obtain an operation formula such that an operation related to the fraction part is executed through a multiplication and an operation associated with the integer part is accomplished through a shift operation. In addition, using a correlation between results of the calculations, the number of calculation steps is reduced. Moreover, one type of information data is written in an area in which another type of information data is beforehand written so as to minimize the necessary memory capacity.
REFERENCES:
patent: 5511094 (1996-04-01), Lee et al.
patent: 5588029 (1996-12-01), Maturi et al.
Naoe Toshiyuki
Nishimura Toshihiko
Nonaka Tsutomu
Sato Hirofumi
Suzuki Naohisa
Gaffin Jeffrey A.
Jean-Pierre Peguy
Nippon Steel Corporation
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