Why is there a delay of about 10 milliseconds of vocals in L or R?

  1. Why is there a delay of about 10 milliseconds of vocals in one of the stereo outputs?

    I heard, this is supposed to give you a sense of space. But our ears are just less than 1 foot apart, and it takes sound about 1 millisecond to travel 1 feet in air. Since our ears are not 10 feet apart, we never perceive the same sound in one ear more than 1 millisecond later than the other. So, what's the point in putting so long delays?
  2. jcsd
  3. Borek

    Staff: Mentor

    You mean SciFi vocals, or Fantasy vocals?
  4. Oh, sorry. I thought this category is for ''SciFi & fantasy movies, TV, books, comics, art, games and culture!'' So I thought I might put question on music as well. Now I get that even the ''TV, books, comics, art, games and culture'' questions have to be based on sci-fi and fantasy stuff.

    Is there a way I can move this thread in a different category?
  5. Pythagorean

    Pythagorean 4,483
    Gold Member

    I would think 1 foot apart only works if you're wearing headphones. If it's designed for speakers, it's really more of a guess. And they're also assuming you're directly in the middle of the speakers, probably.
    1 person likes this.
  6. Borek

    Staff: Mentor

    Honestly, no idea what category it is going to fit. Mostly because I have no idea what the question is about. I mean - I have never heard about the delay being added. But if it is, it just moves perceived source of the sound.
  7. Pythagorean

    Pythagorean 4,483
    Gold Member

    It's a technique to make sound more real by simulating it as it would be in 3D. There's a demo that uses the algorithm with a clip of someone cutting your hair and it sounds/feels like the scissors are actually moving around your head.
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  8. Pythagorean

    Pythagorean 4,483
    Gold Member

    Without using headphones though, I don't think it works near as well, you can't guess the position of everyone in the room or their distance from the speaker, making the geometry rather undefined. The haircut one I listened to with headphones was unsettling. I was scared my ear was going to get snipped.
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  9. jtbell

    Staff: Mentor

    I've moved this to the general "Computing & Technology" forum, because we sometimes have questions about audio/video systems and technology there.
    1 person likes this.
  10. AlephZero

    AlephZero 7,248
    Science Advisor
    Homework Helper

    1 person likes this.
  11. Thank you very much. Yes, I didn't think about speakers actually. But the same sound reaching one ear, even when you're listening to music with speakers, at a delay of about 10-30 ms never happens in reality.

    Somebody told me that it's intended to make the sounds sound ''thicker'' or ''wider'' or whatever. And another said, it helps the ''imperfect'' sounds sound less so.

    Thank you very much for the correction.

    Thank you very much. That link was very helpful.
    Last edited by a moderator: Dec 18, 2013
  12. 1 person likes this.
  13. Thank you very much. Those links were very helpful.
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