Creating auralisation in Odeon, binaural, surround sound etc.
A: The 32 bit IEEE float is a professional format. When using this format you avoid introducing quantization noise. When using a PCM format such as the 16 bit integer format, samples are rounded into 16 bit integer data. By rounding the sample data, a difference between the original data (floating point data) and the data saved in the PCM file may (or rather will) occur - it is the difference between these two signals which is the quantization noise. Quantization noise is exactly that: Noise! and as such it is undesired. Further this type of noise may sound quite nasty (include harmonics). When creating multi source auralisation, many auralisation files are mixed together and this will accumulate noise - including the quantization noise in PCM files. If mixing two files with an equal level of noise - then the level of noise is doubled (+3dB), if mixing 10 files then the noise level increases by 10 dB and if mixing 100 files then the noise level increases by 20 dB. By using the float format at least the quantization noise is avoided.
A: Windows XP does by default not have a codec installed for this format, however there is a free codec package 'DC-DSP' available on the web. When this was written it could be found at
http://www.codecsdownload.com/DC_DSP_Filter_download.htm and had the version number 1.03. When this package is installed, all wave file formats that can be generated by ODEON are supported for playback (except the 32 bit PCM format). If you have installed programs such as 'Adobe Audition', then codex for these formats should already be installed.
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A: The difference in strength appears at high frequencies due to the head functioning as a sound barrier when the head is between one ear and the source. A HRTF-example of this is shown in the figure. |
A: Odeon can produce loudspeaker mapped wave files in the WaveFormatExtensible format. This is fully compatible with Windows media player version /10/11 - thus you may use features in this application such as play lists - be aware the wave files can become quite large (3 times normal stereo waves for a 5.1 Surround Sound set files)
A: You describe a loudspeaker configuration and its loudspeaker positions in the Auralisation setup *(e.g. a 5.1 Surround Sound set). If this setup do not fully mach the physical one, then windows will try its best to remap the signals to whatever speaker layout is available to Windows - best results are of cause achieved if the layout entered in Odeon matches the one in windows (defined in the soundcards speaker setup for a sound blaster card) as well as the actual speaker connected to the soundcard.