Pulse or digital communications – Bandwidth reduction or expansion
Reexamination Certificate
2011-04-19
2011-04-19
Ha, Dac V (Department: 2611)
Pulse or digital communications
Bandwidth reduction or expansion
C375S264000, C375S340000, C382S233000, C382S234000, C348S397100, C348S400100, C348S409100
Reexamination Certificate
active
07929600
ABSTRACT:
In difference coding, each of a first to M-th channel signals is divided into frames and independent energy of every channel signal and difference energy of difference signals between all channel signals are calculated for each frame. In ascending order of energy, if a signal corresponding to an energy value is independent signal, it is determined that independent coding should be used for the signal. If the signal is a difference signal and the type of coding for one of channel signals has been determined, it is determined that the other should be difference-coded using the former channel signal as a reference signal. If the type of coding for neither of the channel signals has been determined, it is determined that one of them should be independently coded and the other should be difference-coded using the former channel signal as a reference signal.
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Kamamoto Yutaka
Moriya Takehiro
Sagayama Shigeki
Ha Dac V
Nippon Telegraph and Telephone Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Toudai TLO, Ltd.
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