File list (Check if you may need any files):
PWS_DSP
.......\AFD_BUTT.M
.......\AFD_CHB1.M
.......\AFD_CHB2.M
.......\AFD_ELIP.M
.......\BLACKMAN.M
.......\CAS2DIR.M
.......\CASFILTR.M
.......\CHEB1HPF.M
.......\CIRCEVOD.M
.......\CIRCONVT.M
.......\CIRSHFTT.M
.......\CONTENTS.M
.......\CONV_M.M
.......\CONV_TP.M
.......\CPLXCOMP.M
.......\DB2DELTA.M
.......\DELTA2DB.M
.......\DFS.M
.......\DFT.M
.......\DIR2CAS.M
.......\DIR2FS.M
.......\DIR2LADR.M
.......\DIR2LATC.M
.......\DIR2PAR.M
.......\EVENODD.M
.......\FREQS_M.M
.......\FREQZ_M.M
.......\HR_TYPE1.M
.......\HR_TYPE2.M
.......\HR_TYPE3.M
.......\HR_TYPE4.M
.......\HSOLPSAV.M
.......\IDEAL_LP.M
.......\IDFS.M
.......\IDFT.M
.......\IMPSEQ.M
.......\IMP_INVR.M
.......\LADR2DIR.M
.......\LADRFILT.M
.......\LATC2DIR.M
.......\LATCFILT.M
.......\LMS.M
.......\MOD.M
.......\MULAW_C.M
.......\MULAW_E.M
.......\OVRLPSAV.M
.......\PAR2DIR.M
.......\PARFILTR.M
.......\PFE2RFZ.M
.......\QUANTIZE.M
.......\RF2PFEZ.M
.......\SDIR2CAS.M
.......\SIGADD.M
.......\SIGFOLD.M
.......\SIGMULT.M
.......\SIGSHIFT.M
.......\STEPSEQ.M
.......\U_BUTTAP.M
.......\U_CHB1AP.M
.......\U_CHB2AP.M
.......\U_ELIPAP.M
.......\ZMAPPING.M