Yamaha Y-S3 Y-S3 V3.1 Manual - Page 19

Atmospheric Condition, Precision, Phase Consideration, Sound Source for Calculation, Graph Overall

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Yamaha Sound System Simulator Y-S3 Owner's Manual V3.1 Atmospheric Condition Enter "Humidity" and "Temperature". These parameters affect the speed of sound and the air absorption coefficient. The default settings are 50% for humidity and 20°C for temperature. Check the "Air Absorption" checkbox to take attenuation of high frequency components due air absorption into account in calculations. Precision Select the degree of precision used in the SPL calculation and contour calculation respectively. When a lower precision is selected, Y-S3 uses an interpolation for faster processing. You may use a lower precision in the design stage for faster processing and the highest precision in the final stage for checking the detailed results. Phase Consideration Check the "Interference Sum" checkbox to take phase interference into account when calculating the frequency characteristics and sound pressure distribution. Energy summing calculations are performed if you do NOT check this box. Sound Source for Calculation Select "Swept Band Noise" or "Full Band Noise" for use as the sound source in the calculation. When "Swept Band Noise" is selected, band pass noise assumed to be used. The bandwidth corresponds to the frequency selected in Aspect View. In this mode, the overall level in Graph is the average energy of each band response. When "Full Band Noise" is selected, full band noise is assumed to be used. The overall level in Graph is the summation of each band response. The "Swept Band Noise" mode is convenient when you want to see the frequency characteristic while referring to the required SPL. You may easily deduce the overall SPL by averaging the SPL results at several frequencies in this "Swept Band Noise" mode. The "Full Band Noise" mode is more reasonable for a comparison of the calculated SPL with the value measured by using full band pink noise and real time spectrum analysis. Fig: Level difference between "Sound Source for Calculation" settings Swept Band Noise Average Full Band Noise Summation SPL SPL Frequency Frequency Graph Overall Select the frequency range of overall level displayed in Graph. The default range is 20 Hz to 20 kHz. For "Swept Band Nose" (cf. previous section), the overall level denotes the average level of the response in the selected range. For "Full Band Noise", the overall level equals the summation of the response in the selected range. Check "A Weighted" checkbox to process the sound in a similar manner to that of the human ear, using "A" characteristics. The Overall figures in Graph are displayed in dBA units. 19

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Yamaha Sound System Simulator Y-S
3
Owner’s Manual V3.1
19
Atmospheric Condition
Enter “Humidity” and “Temperature”. These parameters affect the speed of sound and the air absorption coefficient.
The default settings are 50% for humidity and 20°C for temperature. Check the “Air Absorption” checkbox to take
attenuation of high frequency components due air absorption into account in calculations.
Precision
Select the degree of precision used in the SPL calculation and contour calculation respectively. When a lower
precision is selected, Y-S3 uses an interpolation for faster processing. You may use a lower precision in the design
stage for faster processing and the highest precision in the final stage for checking the detailed results.
Phase Consideration
Check the “Interference Sum” checkbox to take phase interference into account when calculating the frequency
characteristics and sound pressure distribution. Energy summing calculations are performed if you do NOT check
this box.
Sound Source for Calculation
Select “Swept Band Noise” or “Full Band Noise” for use as the sound source in the calculation. When “Swept Band
Noise” is selected, band pass noise assumed to be used. The bandwidth corresponds to the frequency selected in
Aspect View. In this mode, the overall level in Graph is the average energy of each band response. When “Full Band
Noise” is selected, full band noise is assumed to be used. The overall level in Graph is the summation of each band
response. The “Swept Band Noise” mode is convenient when you want to see the frequency characteristic while
referring to the required SPL. You may easily deduce the overall SPL by averaging the SPL results at several
frequencies in this “Swept Band Noise” mode. The “Full Band Noise” mode is more reasonable for a comparison of
the calculated SPL with the value measured by using full band pink noise and real time spectrum analysis.
Fig: Level difference between “Sound Source for Calculation” settings
Swept Band Noise
Full Band Noise
Graph Overall
Select the frequency range of overall level displayed in Graph. The default range is 20 Hz to 20 kHz. For “Swept Band
Nose” (cf. previous section), the overall level denotes the average level of the response in the selected range. For “Full
Band Noise”, the overall level equals the summation of the response in the selected range. Check “A Weighted”
checkbox to process the sound in a similar manner to that of the human ear, using “A” characteristics. The Overall
figures in Graph are displayed in dBA units.
Frequency
SPL
Average
Frequency
SPL
Summation