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Psychoacoustics

Psychoacoustics. Digging deeper into how we hear. What is Psychoacoustics?. It is the SUBJECTIVE HUMAN PERCEPTION of sounds As we learned, we all hear differently than what might be scientifically measured. Sensory and Perception.

uriel-middleton
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Psychoacoustics

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  1. Psychoacoustics Digging deeper into how we hear

  2. What is Psychoacoustics? • It is the SUBJECTIVE HUMAN PERCEPTION of sounds • As we learned, we all hear differently than what might be scientifically measured

  3. Sensory and Perception • Our ears are able to separate certain elements of sound, but not others • This causes compressed sound (Like MP3’s) to sound similar to uncompressed

  4. More on Format Compression • Software can use the ‘Psychoacoustic Model’ to do audio compression • Understanding how our ears are sometimes unable to discern differences can be an advantage • An MP3 is as much as 1/10 the file size of an uncompressed file

  5. Side effects of our ears • INTERMODULATION: • Sometimes our perception causes us to hear distortion or other effects that aren’t actually there • Like when tones interfere with one another

  6. Beat Frequency • One example is a ‘beating’ effect when two TONES are very close to one another

  7. Phantom Fundamentals • Remember: A FUNDAMENTAL is the lowest pitch in any given sound • If we hear a fundamental that isn’t actually there, it is a ‘Phantom’ • Some products take advantage of this

  8. Masking • When one sound is being covered by another sound, usually louder • For example: A loud bus driving by during a conversation

  9. Temporal Masking • When our ear’s ‘Acoustic Reflex’ causes us to not near sounds in time • This is usually the sounds directly around a much louder sound in time • Our ears take time to react

  10. Spectral Masking • This is when two sounds are sharing the same frequency ranges • It causes one to be covered up • This is the biggest concern in mixing

  11. Understanding our Perception • Remember that sound is as much psychological as it is physical! • We all hear in a non-linear way, which changes everyone’s perception

  12. UNIT 2: Auditory Perception • Now, we’ll listening to examples of how our perception causes these side-effects • We’ll hear MASKING and Intermodulation effects

  13. Unit 3: Analyzing Sound • More details on Masking • We’ll hear spectral and temporal masking

  14. Unit 4: Non-Linearities • How our ears actually generate distortion • Again, how we don’t hear perfectly like in nature

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