KVR Audio

sergiofrias · Post by **sergiofrias** » Fri Oct 24, 2014 8:55 pm

Hello Sean,
I just recently found this :

based on your knowledge is this the real concert Hall algorithm used on the 224 or a original algorithm created by Datorro?

thank you

Sérgio

valhallasound · Post by **valhallasound** » Sat Oct 25, 2014 12:08 am

This is the Concert Hall algorithm from the 224XL. The sampling rate (34.125 kHz) and the position of the damping filters in the loop is the giveaway.

I haven't verified that the algorithm will work as drown. It looks like there is a difference in the damping filter for the left and right "branches," and I don't know if this is a typo or an accurate reflection of the plugin.

Based on a conversation I had at an otherwise completely boring embedded systems conference in the mid 2000s, I can confirm that Ensoniq reverse engineered Lexicon hardware when creating the DP/4 and other hardware that uses the ESP chips. I had heard that they had worked with a 224, but the diagram suggests it was a 224XL (the 224 had a 20 kHz sampling rate).

The lengthy comments (http://www.convexoptimization.com/wikim ... verberator) associated with this web page are from me, btw.

Sean Costello

sergiofrias · Post by **sergiofrias** » Sat Oct 25, 2014 4:33 pm

Thank you Sean

yes that's right i've noticed the sampling rate "34.125 kHz" that gives a bandwidth of 15 khz,i'ved but really love the original bandwidth of 8 khz from the 224,it just makes the sound so much "dreamy" and "lush" instant Vangelis

i don't like that extra "hiss"

there is a direct port from that Datorro concert hall in freeverb 3,i will compare it against some impulse responses of the 224 to see how much closer can it get .
Sean are you going in the same direction? in your opinion wich of the VVV algos are closer to the 224 ,including the 8 khz bandwith?

thank you

Sérgio

valhallasound · Post by **valhallasound** » Sat Oct 25, 2014 4:48 pm

sergiofrias wrote: Sean are you going in the same direction? in your opinion wich of the VVV algos are closer to the 224 ,including the 8 khz bandwith?

Dirty Hall, 1970s mode (in the beta version of VVV), is a pretty close match to the Concert Hall B from the 224. I didn't have a 224 available when dialing in Dirty Hall - it was based around a 224XL. However, the 1970s mode has the 8 kHz bandwidth, as well as the weird fixed point artifacts that I heard in the 224XL Concert Hall.

Sean Costello

sergiofrias · Post by **sergiofrias** » Sat Oct 25, 2014 11:14 pm

great news ,can't wait to see the final release...

Lexicon 224 concert hall algorithm...