Coded data generation or conversion – Digital code to digital code converters
Reexamination Certificate
2005-10-14
2008-08-05
Nguyen, Khai M (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
C341S051000
Reexamination Certificate
active
07408481
ABSTRACT:
An information encoding method in which a common multiplier A of the input signal samples x(i) in each frame is estimated. Each sample x(i) is divided by A, the quotient is rounded to the number of significant digits, and the rounded quotient y(i) is encoded. The y(i) is multiplied by A and the product is subtracted from x(i) to obtain an error signal z(i), which is encoded. The A is encoded and the codes of y(i), z(i), and A are combined together and outputted. To estimate A, each numeric value is divided by a determined representative value. Irreducible fractions between the maximum positive error and the maximum negative error are obtained by dividing each numeric value by a correct representative value using rational approximation. Among the obtained irreducible fractions, the one having the smallest common denominator of the numeric values is obtained, which is corrected using the representative value to obtain A.
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Harada Noboru
Moriya Takehiro
Sekigawa Hiroshi
Shirayanagi Kiyoshi
Nguyen Khai M
Nippon Telegraph and Telephone Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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