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Can I record the sound of a passing car and determine the frequencies of approaching and leaving car by matching with musical notes (which equal frequencies) and then just calculate the speed of the car on paper?
To calculate the speed exactly, you also needto know the path that the car is taking, relative to you. Doppler will tell you only the rate of change of distance FROM YOU. you need to include the geometry of the situation. The max Doppler effect will be when the car goes directly past (through) you. At a large distance from the road there is less effect. Because there is a limit to how far away the car can actually heard, you need to take this into account.Perfectly doable but the sums still have to be done.
I notice the car was sticking to the speed limit!
...Can I record the sound of a passing car and determine the frequencies of approaching and leaving car ... and then just calculate the speed of the car on paper?
I also need to know which note equals which frequency.
Quote from: Karsten on 06/08/2009 02:08:46 I also need to know which note equals which frequency. Frequencies of notes based on treble A as 440Hz (concert pitch) are:-C 261.6C sharp 277.2D 293.7D sharp 311.1E 329.6F 349.2F sharp 370.0G 392.0G sharp 415.3A 440.0A sharp 466.2B 493.9C 523.2 (next octave)I'm not much of a musician, I just happen to have a book with the info in, (Open University, "Science Data Book")