Documentation Speaker Positions Examples Extensions
This is the new native format for Windows2000, the Kernel Audio services
from which have been incorporated into Windows98 Second Edition.
WAVE-EX was defined to meet a number of objectives:
The format supports both integer (WAVEFORMATPCMEX) and floating-point (WAVEFORMATIEEEFLOATEX) samples.
Full details of the specification can be read here.
A paper (Word 97 format) by Dave Rossum (Creative Labs), 'An
Integrated Approach to Multi-Channel Audio', presented at WinHEC 99,
is well worth reading, for a broad perspective on the many multi-channel
paradigms, argued from the perspective of a 'virtual' recording studio,
as might be implemented in a modern Audio Workstation. It includes a reference
Currently 18 positions are defined. The first twelve correspond to those
defined by the USB 1.0 protocol. The remainder provide a reasonably complete
set of high and overhead positions. In particular, a standard B-Format
(Ambisonic) cube speaker array can be directly represented. Future versions
of the format may define further speaker positions.
The new format is closely associated with the audio rendering subsystem
in Windows2000 and Windows98 Second Edition.
The following facilities are available to all applications, independently of the specification of the soundard(s):
Note that plain multi-channel files (WAVE and AIFF) can be played directly (e.g in Windows95, using MediaPlayer) if the soundcard's driver offers a true multi-channel 'device'. See Richard Dobson's Soundcard Attrition Page for more information.
Here are two quad soundfiles in the new format. We hope to post more
examples soon, and also that other sites will appear, as other developers
complete the software required to handle the new format. CDP
has published a free Multi-Channel
Toolkit (WIN32 console), which includes a program to play these files
using a multi-channel MME device, and a program to create the quadraphonic
pan illustrated below.
Example 1: from Microsoft
Speech idents, in LCRS surround format(44100Hz,16bit, 3.83 secs)
example 2: created using the CDP Multi-Channel Toolkit (illustrated
Drum, panned ambisonically in a circle in quad format (LF,RF,LR,RR) (22050Hz,16bit, 4.78 secs)
(also contains the PEAK chunk)
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