Hello All, thank you very much for your responses, very much appreciated.
Dave - Thank you for the links and the ideas regarding the application of delay effect to the B-foramt signal; one thing is not clear to me yet is the following and I would be very grateful if you can expand further for me: I have a mono source that is encoded in B-format and already include the rotational information in the encoder (current ICST encoder is an encoder from mono to B-format + panner) so if I apply delay to the B-format signal I am assuming I will already have the system responding to source rotation when I rotate my source without further panning the fx soundfield. Am I correct or I do need to rotate the delay fx soundfield as well according to the source rotation? Both solution are possible as I will use a typical send/return fx path (%wet) for the fx. Gus - Thank you for the link, Cannot check now in the office but will have a look one evening. I am definitely up for sharing ideas and patches. Please feel free to write on my sursound email for any personal communication. Very grateful for all the help from the list. Thankyou Sero > > Message: 3 > Date: Sun, 3 Jun 2012 21:33:58 +0100 > From: Dave Malham <dave.mal...@york.ac.uk> > Subject: Re: [Sursound] B- Format to A-format conversion for an > ambisonics fx > To: Surround Sound discussion group <sursound@music.vt.edu> > Message-ID: > <capw+1zrn0w_5hdrbxpss60oy_z7_pgrwjlez_ogyjmpmzxp...@mail.gmail.com > > > Content-Type: text/plain; charset=UTF-8 > > 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 > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20120603/5b53fa16/attachment.html > > > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > -- > > 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' > > > ------------------------------ > > Message: 4 > Date: Sun, 3 Jun 2012 21:55:37 +0100 > From: Augustine Leudar <augustineleu...@gmail.com> > Subject: Re: [Sursound] B- Format to A-format conversion for an > ambisonics fx > To: Surround Sound discussion group <sursound@music.vt.edu> > Message-ID: > <cabx2jupne7q3zozrbybfe4vio+_k6i_-9ymdyxm5w4b1ndk...@mail.gmail.com > > > Content-Type: text/plain; charset=ISO-8859-1 > > Hi Sero, > I use ICST quite a lot as well - I do as you say and just apply the > effects to the signals before sending them into ambipanning~ > I'm not sure why converting to from B - format A - format will > necessarily allow you more creative possibilities - I'm not really > sure why you would do that, A - format as I understand it is just the > raw recordings that come out of a microphone ? > You can see a patch Ive made here for spatialising audio in 3d with a > wii controller (an electroacoustic granular magic wand): > > http://www.youtube.com/watch?v=7cmodvSM5jE > > Id be happy to share knowledge patches etc , > cheers, > Gus > > > > > -------------- next part -------------- An HTML attachment was scrubbed... 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