Re: [LAD] [ANN] DRC 3.0.1

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To: <linux-audio-dev@...>
Date: Friday, December 5, 2008 - 10:06 am

Hello Julien,

On Thu, December 4, 2008 22:28, Julien Claassen wrote:


with BruteFIR it is even overkill, unless you need really low convolution
latency. In this situation consider Jconv, which uses a differenta algorithm
and provides lower latency without increasing the CPU usage too much.

My current convolver is an obsolete Celeron 800 MHz, which is slow even when
compared to other Celeron CPUs of the same class because it uses some old
notebook chipset on the MB. With BruteFIR it runs six 44.1 KHz 65536 taps
filters consuming about 40% of the CPU power. With a simple stereo filter set
the CPU usage was around 15%. The latency is set at 8192 samples though, it
may be unacceptable for certain situations. Jconv should be able to achieve
latencies down to the soundcard minimum acceptable value with little higher
CPU usage, thanks to its non uniform partitioning algorithm

The key issue is the mic. You need an omnidirectional microphone with a flat
response to get accurate results. The cheapest option is the Behringer
ECM8000, which is already enough to get pretty good results. There are other
cheap calibrated mics on the market (IBF Akustik for example) providing even
better results, optimal for most common situations, for just few more bucks. A
true measurement microphone (B&K, ACO, EAW and so on) costing on the thousands
is most of the times an overkill for this task.

As usual, a good starting point is this one:


Denis Sbragion
Tel: +39 0362 805396, Fax: +39 0362 805404

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Messages in current thread:
[LAD] [ANN] DRC 3.0.1, Denis Sbragion, (Wed Dec 3, 1:25 pm)
Re: [LAD] [ANN] DRC 3.0.1, Julien Claassen, (Thu Dec 4, 9:28 pm)
Re: [LAD] [ANN] DRC 3.0.1, Denis Sbragion, (Fri Dec 5, 10:06 am)
Re: [LAD] [ANN] DRC 3.0.1, Julien Claassen, (Fri Dec 5, 11:16 am)
Re: [LAD] [ANN] DRC 3.0.1, Denis Sbragion, (Fri Dec 5, 11:33 am)
Re: [LAD] [ANN] DRC 3.0.1, Fons Adriaensen, (Fri Dec 5, 12:56 pm)
Re: [LAD] [ANN] DRC 3.0.1, Denis Sbragion, (Fri Dec 5, 1:28 pm)
Re: [LAD] [ANN] DRC 3.0.1, Julien Claassen, (Fri Dec 5, 1:09 pm)
Re: [LAD] [ANN] DRC 3.0.1, Loki Davison, (Thu Dec 4, 11:17 pm)
Re: [LAD] [ANN] DRC 3.0.1, Denis Sbragion, (Fri Dec 5, 10:23 am)
Re: [LAD] [ANN] DRC 3.0.1, Joern Nettingsmeier, (Thu Dec 4, 9:12 pm)