Why a sound seems to be different when played at an increased speed such as 2x?
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M$3 Answers
Increasing the speed of he medium upon which the sound is recorded increases the speed at which the sound is picked up and broadcast (played back). If the play back is faster than the initial recording, then the player will emit higher frequencies and the sound you hear will then have a higher pitch. Playing the same information in a shorter time (faster) yields higher frequency.
NOTE: This same effect is also noticed when a moving sound maker (train, race car) moves toward or away from you. The object is not producing different sounds, but the speed with you you hear it changes because every second it is closer (compressing the wave form) or farther (stretching the wave form) such the same information is heard faster or slower (higher or lower pitch). This is called "doppler" (after the person who first mathematically characterized it). Weather radars use the same effect to discern the speed of clouds/wind.
Hope this helps, SBIRcenter (sbir.us)
I'm an engineer who has studied and employed acoustics for many years.
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M$
The source below goes into a great deal more detail.
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M$
the audio encoded is in a different track.
for example a movie is normally played with these attributes.
Video: MPEG4 Video (H264) 1280x528 23.98fps Video
Audio: AAC 48000Hz 6ch Audio
when u press the 2x speed, the frames of the video are skipped to keep it at pace.
similarly the audio playback rate is also increased to the extent of matching it with the source video.
the voice or songs in the channel gets a frequency boost.
which results in a strange type of sounds.
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M$
