A remote keyless entry (RKE) transponder has a noise alarm timer having a time interval used for determining whether a received signal meets a predefined condition within a time interval. If the received signal meets the predefined condition within the time interval, the noise alarm timer is disabled...http://www.google.de/patents/US7209030?utm_source=gb-gplus-sharePatent US7209030 - Noise alarm timer function for three-axis low frequency transponder
