A new dynamic decimation filter using polyphase MACs for medical ultrasound imaging

Medical ultrasound scanners require a decimation filter capable of changing its length and coefficient vales dynamically. For hardware implementation it is important to design such a dynamic decimation filter with a fixed number of multipliers in such a way that the number of multiplications per unit time should be minimized. A simple data path structure for feeding the filter must also be taken into account. The propose of this work is to propose an efficient DFF architecture which is particularly useful when 2-fold interpolation is employed prior to dynamic decimation for controlling decimation ratio finely.