On 14 Jan 2011, at 17:00, sursound-requ...@music.vt.edu wrote:
> 
> Message: 7
> Date: Fri, 14 Jan 2011 08:52:17 +0000
> From: Dave Malham <d...@york.ac.uk>
> Subject: Re: [Sursound] Available UHJ encoders?
> To: Surround Sound discussion group <sursound@music.vt.edu>
> Message-ID: <4d300ec1.7080...@york.ac.uk>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> 
> 
> On 14/01/2011 01:54, J?rn Nettingsmeier wrote:
>> 
>> under linux, you can run jconvolver with the uhjenc plugin, sounds very 
>> good, but introduces 2048 
>> samples of latency.
>> and fons has recently added an IIR-based uhj encoder to the AMB plugin set 
>> (with zero latency but 
>> likely some compromises in sound quality), i haven't had the chance to test 
>> it carefully, but a 
>> quick run-through showed it does the job, although i prefer the sound of the 
>> convolution one.
> 
> D*mn, I'm just finishing off a (VST/AU) encoder myself using an IIR filter 
> set based on the analogue 
> all pass filters in the original Calrec unit (as designed by Geoffrey)- 

Nice to know something I did 30 years ago is still worth ripping off :-)

These are probably ok at 96 or 192, but at 44.1/48 I think they will wander off 
at high frequencies due to warping.
A better approach is to look for a solution which is symmetrical about fs/4. 
That version is only about 20 years old :-)
Used with backwards dubbing gives partitioned convolution a run for its money.

rgds,
Geoffrey
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