Well I listened to it and the goose flies through my
head neither in front or behind. I tried reversing my
headphones and the goose still flies through my head.
Phil
--- Scott Fraser <> wrote:
> <<In the mp3 clip
> http://homepages.uc.edu/~pelikas/goose.mp3 you'll
> hear a Canada Goose flying from right to left. To
> me, when I
> listen to the recording with headphones, it sounds
> like the goose is
> flying behind me (rather than in front of me ---
> where it might be
> seen, for example). Am I nuts in this perception?
> or arbitrary? Can
> anyone agree/disagree with the effect?>>
>
> It not only appears behind me (in Sennheiser HD280
> Pro headphones) it
> also appears below the horizon. This is with the
> built-in audio
> (middle of the road 24bit converter) & headphone
> driver (also middle
> of the road, neither great nor lousy) provided in a
> Mac G4 PowerBook.
> A high end headphone amp MIGHT reveal better
> directional cues &
> detail, but this IS an MP3 so I wouldn't think much
> real improvement
> is available.
>
> <<When I reverse the channels (switch the headphones
> around left for
> right) it STILL sounds like the goose passes behind
> me. So it seems
> that switching left for right is a "flip" in a
> vertical mirror rather
> than a "rotation". >>
>
> Correct. Switching headphones around is NOT
> equivalent to turning
> around & facing backwards. It merely changes left
> for right with the
> same forward orientation.
>
> <<What kind of information conveys/creates the
> "front/back" effect?>>
>
> With binaural recording, artificial pinnae & a
> head-sized baffle
> shape the sound prior to to it reaching the mics,
> recreating the
> directional cues (HRTF, or
> Head-Related-Transfer-Function) provided
> by our own ears & head. With headphone playback,
> binaural recordings
> have a high degree of front-back realism. Other mic
> techniques are
> weak in the rendering of accurate realistic
> front-back directional
> cues, however, much of binaural's front-back realism
> is lost over
> loudspeakers.
>
> <<Finally, or to be less theoretical: When the
> recording was made, the
> goose flew in front of me. What could I have done
> wrong?.>>
>
> I would say the loss of data in the MP3 encoding
> process has degraded
> the available directional information.
>
> Scott Fraser
>
>
>
> [Non-text portions of this message have been
> removed]
>
>
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