ENHANCED TIME DOMAIN OPTION RECOGNITION SCHEME
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-17
One line Recognition schemes that use a peri- odic time base to determine an option select type are presently limited in their use because ofthe need to quickly determine the option type and because of all the part tolerances involved. A typical applica- tion of this would be an astable 555 timer in the accessory that is being monitored by the radio to determine its distinct duty cycle and therefore its distinct option type. In order for the option select scheme to be useful, it is preferable that the worst option type be repeated at least six times per sec- ond, so that the microprocessor can read at least two successive duty cycles within one third second.