Patent ID: 6326907
Filing Date: 2001-12-04
Classification: H03M

Abstract:
A coding device comprising:a first data memory unit which stores a desired N samples of digital data comprising desired M bits;a maximum value detection unit which detects a maximum value MAX from the N samples of data;a maximum value memory unit which stores the maximum value MAX detected by said maximum value detection unit;a maximum value reading unit which reads out the maximum value MAX from said maximum value memory unit;a minimum value detection unit which detects a minimum value MIN from the N samples of data;a minimum value memory unit which stores the minimum value MIN detected by said minimum value detection unit;a minimum value reading unit which reads out the minimum value MIN from said minimum value memory unit;a data reading unit which reads out a desired data value Yn stored in said first data memory unit;an orthogonal conversion computation unit which calculates a value Xn based on the desired data value Yn and the difference of the maximum value MAX and the minimum value MIN; anda coding unit for coding the calculated value Xn obtained by said orthogonal conversion computation unit into desired K bits.