Coded data generation or conversion – Digital code to digital code converters – Adaptive coding
Reexamination Certificate
2007-04-24
2007-04-24
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
Adaptive coding
C704S229000
Reexamination Certificate
active
10558710
ABSTRACT:
The average amplitude of the samples in a signal sample sequence X in a floating-point format is determined for each frame. If the average amplitude is greater than a predetermined value, an integer formatting part12converts the sequence X into a signal sample sequence Y in a 16-bit integer format by truncation, a compressing part13codes the sequence Y to output a code sequence Ca, a difference producing part14produces a difference signal Z that corresponds to the difference between the signal sample sequence X and a sequence Y′ in the floating-point format converted from the sequence Y, and a compressing part17performs entropy coding on the least significant (23−n) bits of a mantissa M of the difference signal Z, which is determined by the number of bits n following the most significant “1” in each sample in the sequence Y, and outputs a code sequence Cb. If the average amplitude is not greater than the predetermined value, the sequence X is directly losslessly coded by a compressing part121.A code Cd, which indicates which coding is selected, is output.
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Harada Noboru
Moriya Takehiro
Yang Dai
Barnie Rexford
Lauture Joseph
Nippon Telegraph and Telephone Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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