METHOD AND DEVICE FOR HIGH SPEED SCALE CONVERSION

摘要

A method and a device for high-speed scale conversion wherein a value N within a range of N1 and N2 is converted into a small value M within a range of M1 and M2. The method 5 includes the step of obtaining an approximate value of M by loading the value (N-N1+2) into a multi-bit shift register and right-shifting p bits. A binary search process is then used to determine the error value between the actual value of M and the approximate value of M. By avoiding actual multiplication processes, the conversion can be carried out using low-cost electronic hardware such as a microprocessor or a PROM to carry out the binary search process, a shift (10) register to obtain the approximate value of M, a multiplexer to receive an analog input data N and an A/D converter to convert the analog input data N into a digital data N.