Hi Sero,
Although there are times that processing A format may be be useful
in compositional terms (see Jo Anderson's work) it isn't necessary to
change to A format for applying general effects like delay, eq or
gain, even if it involves phase shifts - so long as there are no
differences between channels in the B Format. So, if all channels have
the same delay, no matter what it is. It is entirely possible to
provide a B format feedback path via delays which incorporate
rotations to increase the complexity of the final soundfield. Dylan
Menzies incorporated this in his LAmb software
(http://www.tech.dmu.ac.uk/~dylan/z/dylan/project/holog/index.html).
The same applies to pretty well any effect - if you apply a boost of,
say, +2.65dB at 5kHz to the W channel, you must apply an identical
boost of+2.65dB at 5kHz to all the other channels.
Dave
On 3 June 2012 19:53, SERO SERO <bassi...@gmail.com> wrote:
> Hello list,
>
> This is my first post here so please be patient if I am doing something
> wrong with the replies.
>
> I am working on a patch in MAX 6 for Ambisonics reproduction for a jazz
> band and I am looking in creating a series of FX that can be encoded in 3rd
> order.
>
> My main understanding is that for a delay FX type (and any other fx that
> affects the phase of the signal) I need to convert the B-format signal to
> A-format, then apply the fx I want and then reconvert to B-format.
>
> Does anyone can point me to any resource I can use to understand both
> conversions?
> Also can you share a patch u have done in Max (if anyone use it) I can use
> as a reference?
>
> I use the ICST tools in Max 6 for all the ambisonics processing.
>
> I am already using the trick of applying delay FX to a mono source before
> enconding and then use rotation of the sound field to create ping pong like
> fx but I would like to do something more creative.
>
> Thank you very much
>
> Regards,
> Sero
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--
These are my own views and may or may not be shared by my employer
Dave Malham
Music Research Centre
Department of Music
The University of York
Heslington
York YO10 5DD
UK
Phone 01904 322448
Fax 01904 322450
'Ambisonics - Component Imaging for Audio'
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