Doppler Cents Puzzler

[robert.scott at tunelab-world.com]

Yesterday I corrected Vladan saying that the cents offset due to the Doppler 
effect was the same coming as going.  After some careful reconsideration, 
Vladan was right after all.  The Hz difference is the same coming as going, the 
cents offset is different.

However the conclusion that the bicyclist slowed down after passing the ice 
cream truck cannot be made unless you know that the ice cream truck was right 
on pitch.  The differences between coming and going as so small in this case 
that they are overshadowed by the uncertainty of the speed of sound at those 
particular conditions.

Robert Scott
Real-Time Specialties