How Does Quadrupling Playback Speed Affect the Mach Number in Film Effects?

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SUMMARY

The discussion centers on the impact of quadrupling playback speed on the Mach number in film effects, specifically in a boat chase scene. The Mach number is calculated using the formula Mach # = velocity of boat / speed of sound, where the speed of sound is determined by the equation 331 + 0.60*T, with T representing temperature. It is concluded that quadrupling playback speed will distort the perceived sound frequency, leading to inaccuracies in the sound effects relative to the actual speed of the boats during filming.

PREREQUISITES
  • Understanding of Mach number calculations
  • Knowledge of the speed of sound formula
  • Familiarity with the effects of playback speed on audio
  • Basic principles of sound frequency and perception
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  • Explore advanced concepts in sound design for film
  • Learn about the physics of sound propagation in different mediums
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Filmmakers, sound designers, physics students, and anyone involved in creating realistic audio-visual effects in cinema.

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Speed of Sound and Mach

Homework Statement


You are hired as the physics consultant for a large movie studio. The producer is way over budget and wants to perform some special effects that will save him money. He decides to shoot the dramatic action boat chase scene with the boats going at 1/4 the speed of what will be seen on film. He quadruples the speed of playback. Explain why or why not this will work.


Homework Equations



Mach # = velocity of boat/ speed of sound
Speed of sound = 331 + 0.60*T
T = temperature


The Attempt at a Solution



I don't even know where to begin. I don't think it will work, but maybe if someone could point me in the right direction?
 
Last edited:
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I think the idea is that the sound won't be right. What happens to the frequency of the sounds heard when playback is quadrupled?
 

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