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1.发明公开FLOATING POINT TYPE DIGITAL SIGNAL REVERSIBLE ENCODING METHOD, DECODING METHOD, DEVICES FOR THEM, AND PROGRAMS FOR THEM 审中-公开DIGITAL SIGNALUMKEHRBARES苍蝇逗号型的编码方法，解码方法，装置体和PROGRAMS THEREFOR
公开(公告)号：EP1622275A4
公开(公告)日：2007-03-14
申请号：EP04729713
申请日：2004-04-27
发明人： MORIYA TAKEHIRO , YANG DAI , JIN AKIO , IKEDA KAZUNAGA
CPC分类号： H03M7/30 , G10L19/0017 , H03M7/24
摘要： Digital signal samples X in a floating-point format, each of which is composed of 1 bit of sign, 8 bits of exponent E and 23 bits of mantissa M, are converted through rounding by an integer formatting part 12 into digital signal samples Y in an integer format, the sequence of the digital signal samples Y is losslessly compression-coded by a compressing part 13 into a code sequence Ca, and the code sequence Ca is output. The digital signal samples Y are converted by a floating point formatting part 15 into digital signal samples X' in the floating-point format, a difference signal ”X indicating the difference between the digital signal sample X' and the digital signal sample X is determined by a subtraction part 16, the difference signal ”X is losslessly coded, and the resulting code sequence Cb is output.
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2.发明公开FLOATING POINT SIGNAL REVERSIBLE ENCODING METHOD, DECODING METHOD, DEVICE THEREOF, PROGRAM, AND RECORDING MEDIUM THEREOF 有权SIGNALREVERSIBLES浮点编码方法，解码方法及其装置，程序和记录介质THEREFOR
公开(公告)号：EP1662667A4
公开(公告)日：2007-05-02
申请号：EP04772602
申请日：2004-09-01
发明人： MORIYA TAKEHIRO , YANG DAI , HARADA NOBORU
IPC分类号： H03M7/30 , G06F5/00 , H03M7/24 , H03M7/36 , H04N7/24 , H04N19/00 , H04N19/12 , H04N19/146 , H04N19/196 , H04N19/60 , H04N19/70 , H04N19/91
CPC分类号： H03M7/24 , G10L19/0017 , H03M7/30
摘要： 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 part 12 converts the sequence X into a signal sample sequence Y in a 16-bit integer format by truncation, a compressing part 13 codes the sequence Y to output a code sequence Ca, a difference producing part 14 produces 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 part 17 performs 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 part 121. A code Cd, which indicates which coding is selected, is output.
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3.发明公开FLOATING-POINT TYPE DIGITAL SIGNAL REVERSIBLE ENCODING METHOD, DECODING METHOD, APPARATUSES THEREFOR, AND PROGRAMS THEREFOR 有权FOR DIGITAL可逆编码方法用信号GLEIT TYPE，解码方法，装置体和PROGRAMS THEREFOR
公开(公告)号：EP1638209A4
公开(公告)日：2006-08-16
申请号：EP04746195
申请日：2004-06-21
发明人： MORIYA TAKEHIRO , YANG DAI
CPC分类号： H03M7/24
摘要： 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 part 12 into signal samples Y in a 24-bit integer format, the integer-value signal samples Y are coded by a compressing part 13 into 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 part 14 extracts 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 part 17 performs 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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