Test Method (A. At least [four] measurements shall be made at every speed specified in paragraph 4. 3.1. The emitted sound shall be recorded during each passage of the vehicle between AA’ and BB’ for each microphone position. A correction for the Doppler effect may be applied, if needed. From each measurement sample a segment of +/- 1 second around the maximum sound level shall be cut out for further analysis. (Signal to Noise ratio analysis)
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Sources: Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles, Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles
Test Method (A. At least [four] four measurements shall be made at every speed specified in paragraph 4.
3.1. .. The emitted sound shall be recorded during each passage of the vehicle between AA’ ' and BB’ ' for each microphone position. A correction for the Doppler effect may be applied, if needed. From each measurement sample a segment of +/- 1 second around the maximum sound level taken from AA until -1 meter before PP' shall be cut out for further analysis. (Signal to Noise ratio analysis).
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