An approximation method is described for the design of lowpass filters where the input stage has a frequency-dependent gain characteristic. These filters are used in speech processing systems. The proposed method, being closed-form solution, is more reliable and requires much less C. P. U. time compared to the previously used methods. The developed algorithm can be incorporated into any suitable general synthesis program.

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Conference Proc IEEE Int Symp Circuits Syst
Nakhla, M.S. (1978). APPROXIMATION OF LOWPASS FILTERS WITH FREQUENCY-DEPENDENT INPUT GAIN CHARACTERISTIC. Proceedings - IEEE International Symposium on Circuits and Systems, 66–70.