10 research outputs found
Quantization effects in the polyphase N-path IIR structure
Polyphase IIR structures have recently proven themselves very attractive for very high performance filters that can be designed using very few coefficients. This, combined with their low sensitivity to coefficient quantization in comparison to standard FIR and IIR structures, makes them very applicable for very fast filtering when implemented in fixed-point arithmetic. However, although the mathematical description is very simple, there exist a number of ways to implement such filters. In this paper, we take four of these different implementation structures, analyze the rounding noise originating from the limited arithmetic wordlength of the mathematical operators, and check the internal data growth within the structure. These analyses need to be done to ensure that the performance of the implementation matches the performance of the theoretical design. The theoretical approach that we present has been proven by the results of the fixed-point simulation done in Simulink and verified by an equivalent bit-true implementation in VHDL
Virtual classroom
This paper presents the results of the "Virtual Classroom" project sponsored by the University of Westminster, Educational Initiative Centre (EIC) for delivering lectures on-line. The ultimate aint was to provide a portable hardware and easy to use software toolset as well as easy to follow guidelines on how to propel the lectures from the conventional dull chalk and talk environment to the realm of all interactive computer assisted web based electronic classroom, The additional goal was to minimise the number of staff required to give the lectures and allow them to use their valuable time,for other academic duties