Implementation of modified wave digital filters using digital signal processors

This paper describes the implementation of multirate modified lattice wave digital filters using digital signal processors. A cascaded interpolator, based on bireciprocal modified lattice wave digital filters, for interpolation of high quality audio signals is presented. The interpolator is implemented in an ADSP-21065L digital signal processor. The methodology for this and the results are presented. The frequency response of the cascaded interpolator realized with the ADSP-21065L processor is analyzed for an interpolation ratio R=8. This interpolator achieves a signal-to-noise and distortion ratio S/sub INAD/ near to 90 dB and a passband ripple of /spl delta//sub p//spl ap/8.10/sup -6/ dB.