Patent ID: 7209885

Claim:
A method that is used for compressing information, the method comprising: receiving a sound signal, an image signal or a data signal; converting the sound signal, the image signal or the data signal into a binary code bit string {y}; obtaining first and second bit strings {y} 1 and {y} 2 respectively from the binary code bit string {y}; defining a quantized initial value Y(0) by giving a binary weight to the first bit string {y} 1 ; obtaining an internal status x(0) using the quantized initial value Y(0) and n in a right-hand side of an inverse transform of isomorphic transform and quantization expression, x (0)={sin π Y n (0)/2 n+1 } 2 (where n is a quantized resolution of the first bit string); substituting the obtained internal status x(0) in a right-hand side of an inverse calculation expression of a logistic map, x ( t− 1)=(1±(1− x ( t ) 1/2 )/2 (where t is a discrete time), and selecting a sign of positive or negative in the right-hand side of the inverse calculation expression according to a binary value of the second bit string {y} 2 , thereby obtaining a past retroactive internal status, the substituting and selecting steps sequentially executed by the number of bits of the second strings {y} 2 ; generating a compressed code Y(−τ) by using a resultant internal status x(−τ) and m in a right-hand side of an isomorphic transform and quantization expression, Y (−τ)=2/π×arcsin( x (−τ)) 1/2 ×2 m (where m is a newly defined quantized resolution of the second bit string, and τ is a discrete time newly defined for the above t); and outputting the compressed code Y(−τ), wherein a length of the compressed code Y(−τ) is less than a length of the bit string {y}.