Getting technical..

[doodoo]

For me NOT. http://www.sysopt.com/forum/smile.gif
Need technical info.
HRTF is.. Other then providing reverbs for all 4 channels.. what is it?
I don't even know what it stands for. Visiting Creative's site, I noticed the powered sub-woofer specs of the FPS2000 and Soundworks Digital look different. When they should be all at 22watts. What is THD - being also mentioned there??
Thanks!! Really need help here - everyhting would be greatly appreciated.

[richamies]

HRTF - Not a clue, I thought it was something Females used when they got older http://www.sysopt.com/forum/smile.gif

THD - Total Harmonic Distortion. It is normally only quoted on Amplifiers. It should be WELL under 1% for a semi-decent amp. Mine is quoted at 0.07%@95% peak power. Basically its the amount of distortion in the sound, produced by the amplifier.

[jad1097]

Hope this is what you are looking for.
http://www-engr.sjsu.edu/%7Eduda/Duda.R.B.8.html

The Physical Basis:
Head-Related Transfer Functions

Rayleigh's spherical-head model gives a first-order picture of how the diffraction of a plane wave by the head results in a frequency-dependent variation in the sound pressure developed at the ears. For a more accurate picture, we need to know the effects of diffraction by the torso and the pinnae as well.

All of these effects are captured in the so-called head-related transfer function (HRTF) or, equivalently, the head-related impulse response (HRIR). The HRTF relates the transmitted source sound pressure to pressure developed at the ear drum. It varies with frequency, azimuth, elevation and range, and reveals the physical cues for sound localization.

The complexity of the geometry destroys all hope of solving for the HRTF analytically, and the wide range of wavelengths involved (17m at 20 Hz to 17mm at 20 kHz) discourages numerical solutions. Thus, most of what we know about the HRTF has come from direct experimental measurements (e.g., see Kistler and Wightman or Moller et al.).

Fig. 3: The head-related impulse response in the horizontal plane


Fig. 4: The head-related impulse response in the median plane

http://www.sensaura.co.uk/wse/tech/tech.html


[This message has been edited by jad1097 (edited 01-08-2000).]