Self-test method for a vehicular telematics unit
First Claim
1. A method of testing for satisfactory operation of a telematics unit, comprising the steps of:
- placing a phone call from the telematics unit to a remote call center or phone simulator via a communication network;
supplying a test tone from the remote call center or phone simulator to the telematics unit via the communication network;
reproducing the supplied test tone via an audio output of the telematics unit;
receiving the reproduced test tone at an audio input of the telematics unit;
conducting an analysis the received test tone using a signal processor of the telematics unit to determine if the telematics unit is operating satisfactorily; and
outputting a result of the analysis.
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Abstract
A self-test methodology verifies the satisfactory operation of an installed vehicular telematics unit using a signal processor of the telematics unit. The test can be initiated at any time by a vehicle occupant or a remote call center. When testing is initiated, the telematics unit places a cellular call to the call center or a phone simulator, which generates a test tone that is reproduced in the vehicle cabin through the audio output and loudspeaker of the telematics unit. The telematics unit uses its microphone input to sample the reproduced tone, and a signal processor within the telematics unit analyzes the sampled tone by performing a SINAD or equivalent calculation. The test evaluates the sound quality of the telematics unit and verifies operability of the antenna, phone, audio and microphone components.
21 Citations
10 Claims
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1. A method of testing for satisfactory operation of a telematics unit, comprising the steps of:
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placing a phone call from the telematics unit to a remote call center or phone simulator via a communication network; supplying a test tone from the remote call center or phone simulator to the telematics unit via the communication network; reproducing the supplied test tone via an audio output of the telematics unit; receiving the reproduced test tone at an audio input of the telematics unit; conducting an analysis the received test tone using a signal processor of the telematics unit to determine if the telematics unit is operating satisfactorily; and outputting a result of the analysis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification