Approximation of low-pass filters with frequency-dependent input gain characteristic
Michel S. Nakhla · IEEE Transactions on Circuits and Systems · 1979
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.