TIME DOMAIN ACCESSORY RECOGNITION SCHEME UTILIZING OPTICAL INTERCONNECT
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-21
Presently, accessory recognition is accomplished via the interconnection of an electrical lime or lines. This scheme allows the radio to recognize an accessory and select an external option class (external speaker, exter- nal microphone, external RE .) by sensing the frequency that a light source, such as an LED, is being strobed at by a multivibrator contained in the accessory. Thus, the accessory recognition is achieved via an optical inter- connect and not an electrical interconnect.