Vehicle event data recorder including validation of output

Abstract

An event recorder ( ) mounted in a vehicle ( ) includes sensors, including image sensor ( ), sound sensor ( ), location sensor ( ), and vehicle performance sensors, and a capture circuit for storing sensed data signals around a triggering event. A CPU and program memory ( ) are programmed to perform a validation function, such as a one-way hash function, on the captured sensor signal while transferring it to persistent memory device ( ) so as to derive a validation value which is also stored in persistent memory device ( ). To later verify that the data have not be tampered with, the stored data are operated on by the same validation function so as to derive an audit validation value, the audit validation value is compared with the validation value for equality and the outcome of the comparison is indicated.