How do I crate a holophonic beep?

Question

I am working on a simple video game. I want to incorporate 3d sound, but only through headphones. There's this type of recording called holophonic sound. I did research and found out that a special extra signal gets added to a sound to make it seem to come from a certain place. Since this signal is different for different angles, but not different when you record multiple times from the same angle, then there must be some sort of algorithm in making the added signal. Does anyone know how do i make this stignal or what exactly makes this signal?

I am working on a simple video game. I want to incorporate 3d sound, but only through headphones. There's this type of recording called holophonic sound. I did research and found out that a special extra signal gets added to a sound to make it seem to come from a certain place. Since this signal is different for different angles, but not different when you record multiple times from the same angle, then there must be some sort of algorithm in making the added signal. Does anyone know how do i make this signal or what exactly makes this signal?

Answer 1

Stereophonic hearing (the ability to perceive the direction of a sound) happens because the sound arrives at our ears at slightly different times. If a sound comes from straight ahead, it arrives at each ear at the same time. If it comes from the right, it arrives at the right ear a bit less than a millisecond before it reaches the left ear. This 'time correlation' takes place in our brains and gives us the sense of direction of the sound.

To make the sound 'seem to' come from the left, simply delay the sound to the right headphone by about a millisecond. Since sound travels at about 1080 ft.sec. and the average distance between most people ears is about 10 to 12 inches, using a delay of about
770 µsec*cos(Θ) (where Θ is the angle from the 'straight ahead' axis) should give you the desired effect.


Doug

Answer 2

Get a crate and put the holphonic beep inside it.