In the case that the bit width of a high-speed internal calculation of CPU or DSP is restricted and the high-speed internal calculation is performed as a fixed-point calculation, and the bit width of the input data of CPU or DSP is different from the bit width of the high-speed internal calculation,...http://www.google.fr/patents/US5941941?utm_source=gb-gplus-shareBrevet US5941941 - Bit width controlling method
