A scaling system and technique which employs an analog-to-digital converter having at least 10-bit accuracy and a ranging circuit to compensate for abnormally large vehicle magnetic fields. The ranging circuit employs variable resistance negative feedback, which enables an electronic compass system to...http://www.google.es/patents/US5351204?utm_source=gb-gplus-sharePatente US5351204 - Scaling system and method for an electronic compass
Scaling system and method for an electronic compass
