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

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Journal IEEE Transactions on Circuits and Systems
Nakhla, M.S. (1979). Approximation of Low-Pass Filters with Frequency-Dependent Input Gain Characteristic. IEEE Transactions on Circuits and Systems, 26(3), 198–202. doi:10.1109/TCS.1979.1084626