Common use of Signal Processing Clause in Contracts

Signal Processing. For each recorded sample the average auto power spectrum shall be determined, using a ▇▇▇▇▇▇▇ window and at least 66.6% overlap averages. The frequency resolution shall be chosen to be sufficiently narrow as to allow a separation of the frequency shift per target condition. The reported speed per sample segment is the average vehicle speed over the time of the sample segment rounded to the first decimal place. In case of test method (A) the frequency that is intended to be changed with the speed shall be determined per sample segment. The reported frequency per target condition fspeed shall be the mathematical average of the frequencies determined per measurement sample and rounded to the nearest integer. The reported speed per target condition shall be the mathematical average of the four sample segments. Table 4 Target speed Test run per target condition Reported speed (average per sample segment) Determined frequency of interest (fj, speed) Reported Speed per target condition (average of the reported speeds) Reported frequency of interest per target condition (fspeed) For all other test methods the derived frequency spectrum shall directly be used for the further calculation. 4.5.1. Data compilation and reported results The frequency intended to be shifted shall be used for the further calculation. The frequency of the lowest reported test speed rounded to the nearest integer is taken as the reference frequency fref. For the other vehicle speeds, the corresponding shifted frequencies fspeed rounded to the nearest integer shall be taken from the spectra analysis. Calculate del f, the frequency shift of the signal according to equation (1): del f = {[(fspeed - fref)/(vtest – vref)]/fref} · 100 equation (1) where fspeed is the frequency at a given speed value; fref is the frequency at the reference speed of 5 km/h or the lowest reported speed; vtest is the vehicle speed, actual or simulated, corresponding to the frequency fspeed; vref is the vehicle speed, actual or simulated, corresponding to the frequency fref; The results shall be reported using the following table: Table 05 Reported Speed km/h Frequency, fspeed, Left Side Hz Frequency, fspeed, Right Side Hz Frequency Shift, Left Side % n.a. Frequency Shift, Right Side % n.a. Figures 1a and 1b

Signal Processing. For each recorded sample the average auto power spectrum shall be determined, using a ▇▇▇▇▇▇▇ window and at least 66.6% 66.6 per cent overlap averages. The frequency resolution shall be chosen to be sufficiently narrow as to allow a separation of the frequency shift per target condition. The reported speed per sample segment is the average vehicle speed over the time of the sample segment rounded to the first decimal place. In case of test method (A) the frequency that is intended to be changed with the speed shall be determined per sample segment. The reported frequency per target condition fspeed shall be the mathematical average of the frequencies determined per measurement sample and rounded to the nearest integer. The reported speed per target condition shall be the mathematical average of the four sample segments. Table 4 Target speed Test run per target condition Reported speed (average per sample segment) Determined frequency of interest (fj, speed) Reported Speed per target condition (average of the reported speeds) Reported frequency of interest per target condition (fspeed) For all other test methods the derived frequency spectrum shall directly be used for the further calculation. 4.5.1. Data compilation and reported results The frequency intended to be shifted shall be used for the further calculation. The frequency of the lowest reported test speed rounded to the nearest integer is taken as the reference frequency fref. For the other vehicle speeds, the corresponding shifted frequencies fspeed rounded to the nearest integer shall be taken from the spectra analysis. Calculate del f, the frequency shift of the signal according to equation (1): del f = {[(fspeed - fref)/(vtest – vref)]/fref} · 100 equation (1) where fspeed is the frequency at a given speed value; fref is the frequency at the reference speed of 5 km/h or the lowest reported speed; vtest is the vehicle speed, actual or simulated, corresponding to the frequency fspeed; vref is the vehicle speed, actual or simulated, corresponding to the frequency fref; The results shall be reported using the following table: Table 05 Reported Speed km/h Frequency, fspeed, Left Side Hz Frequency, fspeed, Right Side Hz Frequency Shift, Left Side % n.a. Frequency Shift, Right Side % n.a. Figures 1a and 1b

Signal Processing. For each recorded sample the average auto power spectrum shall be determined, using a Hanning wind▇▇▇▇▇ ▇▇▇ window and at least 66.6% 66.6 per cent overlap averages. The frequency resolution shall be chosen to be sufficiently narrow as to allow a separation of the frequency shift per target condition. The reported speed per sample segment is the average vehicle speed over the time of the sample segment rounded to the first decimal place. In case of test method (A) the frequency that is intended to be changed with the speed shall be determined per sample segment. The reported frequency per target condition fspeed shall be the mathematical average of the frequencies determined per measurement sample and rounded to the nearest integer. The reported speed per target condition shall be the mathematical average of the four sample segments. 1 Note by the secretariat: as an aid for measurement of frequency shift see flowchart in Figure 7a, 7b or 7c of the Appendix to this annex. Table 4 Analysis of the shifted frequency per target condition per side Target speed Test run per target condition Reported speed (average per sample segment) Determined frequency of interest (fj, speed) Reported Speed per target condition (average of the reported speeds) Reported frequency of interest per target condition (fspeed) km/h No km/h Hz km/h Hz 5 1 4 10 1 2 3 2 4 20 1 For all other test methods the derived frequency spectrum shall directly be used for the further calculation. 4.5.1. Data compilation and reported results The frequency intended to be shifted shall be used for the further calculation. The frequency of the lowest reported test speed rounded to the nearest integer is taken as the reference frequency fref. For the other vehicle speeds, the corresponding shifted frequencies fspeed rounded to the nearest integer shall be taken from the spectra analysis. Calculate del f, the frequency shift of the signal according to equation (1): del f = {[(fspeed - fref)/(vtest – vref)]/fref} · 100 equation (1) where fspeed is the frequency at a given speed value; fref is the frequency at the reference speed of 5 km/h or the lowest reported speed; vtest is the vehicle speed, actual or simulated, corresponding to the frequency fspeed; vref is the vehicle speed, actual or simulated, corresponding to the frequency fref; The results shall be reported using the following table: Table 05 5 Report table, to be completed for each frequency analysed Test Results at Target Speeds 5 km/h (Reference) 10 km/h 15 km/h 20 km/h Reported Speed km/h Frequency, fspeed, Left Side Hz Frequency, fspeed, Right Side Hz Frequency Shift, Left Side % n.a. Frequency Shift, Right Side % n.a. Figures 1a and 1b.