21st December 2003
Basic Study - Page 11 - Actual Output Locations
The complete horn's output will also be studied.
It is known that the acoustical energy output out of the mouth is irregular, not only the frequency response is different, but at various angle of output is also very different.
This is Inside Middle
Then Middle out 5 cm - It looks like further away, but is actually frontal further, not side way further.
Close end 5 cm - This time can actually see it is out / side wards
Finally Far end 10 cm
These results are not 100% reliable type. Because they include interference from the nearby environment, or the complete room even. However it's results serve an extremely good demonstration of horn's directional differences.
A proper anechoic chamber is required. Else time windowing the measurement is critical. However they are not carried out. In order to apply time window technique a cleaner / less obstructive environment is required.
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