00357nam a2200133Ia 450000100040000000500170000400800410002102000150006208200190007710000270009624500390012326000140016265000470017664520261006003452.0120911s9999    xx            000 0 und d  a0830644318  a621.381532 ROR  aRorabaugh, C. Britton   aDigital filter designer's handbook  aTab Books  aSystems engineering       Switching theory