| 摘要 |
PURPOSE:To reduce the loss of a dynamic range when the number of bit of an inputted digital signal is converted into a small number of bits and to reduce the degradation of the resolution when the level of an inputted signal is large (it is near to full bits). CONSTITUTION:The loss of a dynamic range is reduced and the degradation of the resolution when an inputted signal level is large (it is near to full bits) can be reduced by providing a bit conversion circuit 2 capable of switching the bit shift conversion by a fixed point system and the conversion by a floating point system, detecting the level of an inputted signal in a maximum bit detection circuit 3 when the number of bit of the inputted digital signal is converted into a small number of bits and switching the bit conversion circuit 2 by determining the conversion by a fixed point system or the conversion by a floating point system by a fixed/floating point switching circuit 4 according to this detection signal. |
