Coded data generation or conversion – Digital code to digital code converters – To or from mixed base codes
Reexamination Certificate
2007-06-12
2007-06-12
Young, Brian (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from mixed base codes
C341S051000
Reexamination Certificate
active
10554739
ABSTRACT:
Signal samples X in a floating-point format, each of which is composed of 1 bit of sign S, 8 bits of exponent E and 23 bits of mantissa M, are converted through truncation by an integer formatting part12into signal samples Y in a 24-bit integer format, the integer-value signal samples Y are coded by a compressing part13into a code sequence Ca, and the code sequence Ca is output. According to the number of digits n following the most significant “1” in the integer-value signal sample Y, a difference producing part14extracts the least significant (23−n) bits from the mantissa M of the input signal sample X to form a difference signal Z, and a compressing part17performs entropy coding of the difference signal Z to produce a code sequence Cb and outputs the code sequence Cb. Alternatively, the difference signal Z may be output as it is, rather than being compressed.
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Moriya Takehiro
Yang Dai
Nippon Telegraph and Telephone Corporation
Young Brian
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