VLSI IMPLEMENTATION OF TONE ENCODING AND DECODING FUNCTION SPECIFIED IN THE NEW ALE PROTOCOL TO ENHANCE MF AND HF RADIO INTEROPERABILITY

THE OBJECTIVE OF THE PHASE I WORK PRESENTED IN THIS PROPOSAL IS TO GENERATE A PERFORMANCE AND FUNCTIONAL SPECIFICATION AND BLOCK DIAGRAM DESIGN OF A SINGLE VLSI CHIP IMPLEMENTING THE AUDIO TONE ENCODER AND DECODER FUNCTIONS OF A DIGITAL MODEM. THE TONE ENCODER/DECODER CHIP, WHEN COMBINED WITH AN OFF-THE-SHELF AD/CONVERTER, WILL PROVIDE A COMPLETE TWO-CHIP IMPLEMENTATION OF THE DIGITAL MODEM REQUIRED BY THE NEW GOVERNMENT MANDATED AUTOMATIC LINK ESTABLISHMENT ("ALE") PROTOCOL. THE PROTOCOL IS SPECIFIED IN BOTH MIL-STD-188-141A AND FED-STD-1045. THE ALE PROTOCOL IS REQUIRED IN ALL GOVERNMENT (MILITARY AND GOVERNMENT AGENCY) MF AND HF RADIOS INCORPORATING AN ALE CAPABILITY TO IMPROVE RADIO INTEROPERABILITY.