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6.4.4 Multi-Channel Based Input

Any input module configured to represent a stream of multi channel audio can be configured as a Speaker Arrangement format which would require that amount of channels, as a minimum. For example, DTU 7.1 needs 8 channels, and DTU 5.1 needs 6. Auro3D 13.1 needs 14 channels. Unfortunately things can get complicated in practice, as there are a few variations of standardised speaker layouts which have the same number of channels and seem very similar - but need disambiguation. This is important to get right, and will depend a lot on the context of your project and on changing standards in the audio industry. For example, at least four different 7.1 routing standards are to be found ‘in the wild’ and its important to know which one you are actually dealing with. Often, for example, the so-called ‘Low Frequency Effects’ channel in cinema surround formats, is not always on the same channel.

★ Try to stick to industry standard channel naming conventions throughout a cinematic surround sound project

L C R
sL   sR
surround Left   surround Right
  LFE  
  Low Frequency Effects  
sbL   sbR
surround back Left   surround back Right

Some common Speaker Channel naming abbreviations

Please refer to Appendix C for special information about handling LFE and Mono Sub Woofer routing in Channel Based applications.