CMI-8738 データシートの表示（PDF） - C-Media Electronics

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CMI-8738

C3DX PCI-Based HRTF 3D Extension Positional Audio Chip

C-Media Electronics 

Ver. 1.2

CMI-8738/PCI-SX AUDIO Specification

HRTF 3D Positional Audio Technology White-Paper

C3D HRTF Positional Audio Technology

C3D technology uses an audio filter called Head Related Transfer Functions (HRTFs), which

is licensed from CRL®(Central Research Lab). The basic concept of C3D is: since we can

hear sound three dimensionally in the real world using our two ears, it must be possible to

regenerate the same sound effect from two loud speakers.

What is HRTF ?

HRTF (Head Related Transfer Functions) is a set of audio filters which can vary locations of

sound effects (spatial hearing cues) in three-dimension measured from the listener's

eardrum.

People can use this technology and special digital signal processing to re-create spatial

hearing cues, so as to makes the ears hear a realistic and three-dimensional sounds coming

from a pairs of loud speakers or headphones.

There are several listening cues which allow people to hear

sounds three-dimensionally :

(I). Spatial Hearing : Primary 3D-cues

1. IAD

The head shadowing effect creates differences in the amplitudes of the sound signals

arriving at each ear from the source. The effects of diffraction are most noticeable in

the range between about 700 Hz to 8 KHz, where the A and S functions periodically

converge and diverge gently. This Inter-aural Amplitude difference (IAD) is one of the

primary 3D sound cues.

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