It may sound like a contradiction, but adjusting the time delays of a similar signal not only adjusts the time of that signal in space, it adjusts the stereo sound field when it reaches the ears. This ‘bending’ of sound is a direct result of the HAAS, dummy head mic and ORTF and NOS techniques and IAD (interaural amplitude difference) and ITD (interaural time difference) theorums. Although we are using one signal to create a 3D effect and these techniques use near coincedent mic placement, the same result (or very similar. I’m of the mind that if you want a stereo spatial effect use two mics.) should theoretically be achiveable.
So, let’s have a look. Each sound has a left and right channel. First I delayed the left channel by 34 ms while keeping them both panned centre. The delayed sound naturally sounded quieter so I didn’t roll off any tops. There are two distinct sounds in this part. The next three are single sounds. Next I tried an Interference Pan. I pitch shifted the left channel down by half a semitone. This sounds more ‘filtered’, kind of more comb filtered sounding. The third sound is a Forward Sound version. This had the right channel fader lowered 3dB to make the sound go more to the left and finally the Stereoised version used two methods. I panned them both at 3 and 9 o’clock respectively, deleayed the right channel by 34 ms and also cut its dominant frequency at 3k.
So, let’s have a look. Each sound has a left and right channel. First I delayed the left channel by 34 ms while keeping them both panned centre. The delayed sound naturally sounded quieter so I didn’t roll off any tops. There are two distinct sounds in this part. The next three are single sounds. Next I tried an Interference Pan. I pitch shifted the left channel down by half a semitone. This sounds more ‘filtered’, kind of more comb filtered sounding. The third sound is a Forward Sound version. This had the right channel fader lowered 3dB to make the sound go more to the left and finally the Stereoised version used two methods. I panned them both at 3 and 9 o’clock respectively, deleayed the right channel by 34 ms and also cut its dominant frequency at 3k.
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Audio
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Haines, Christian. 2007. “AA1-Spacialisation” Seminar presented at the University of Adelaide, 25th October.
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