Digital Room Correction

I just realised that I wasnt actually subscribed to this list... Anyone 
wants to know anything about my setup (Brutefir+DRC for correction, 
Mythtv for audio and video playback, ie all in one box) then have a look 
on the http://www.duffroomcorrection.com page here:

http://www.duffroomcorrection.com/wiki/User:Ed_Wildgoose

Good luck all!

Ed W

Hello Markus,

At 13.03 04/10/2005 +0200, markus.mb.beck@... wrote:
>I tried the AXCO and it started playing immediately and without trouble !!
>Then I tried to update from DRC2.4.2 which is delivered in the download to
>DRC2.6. Unfortunately, this did not work. Although DRC does read the target

AFAIK the ACXO development has stopped, and the available version miss many 
importan parameters availabe into the latest DRC versions. Making it 
working with 2.6.0 is mainly a matter of hackery.

>curve input, the target response curve is not taken into accout - its
>correcting to a linear frequency response - and it has an frequency error
>around 17 kHz. I spend more than one hour on a one to one translation from
>the old DRC-input file to the DRC2.6 input file, but I could not get rid of
>these problems. Does anyone have an idea ??

At first sight the DRC file supplied has no mistake in it. Does DRC provide 
some error while processing it?

Bye,
--
	Denis Sbragion
	InfoTecna
	Tel: +39 0362 805396, Fax: +39 0362 805404
	URL: http://www.infotecna.it

Hello alltogether,

I tried the AXCO and it started playing immediately and without trouble !!
Then I tried to update from DRC2.4.2 which is delivered in the download to
DRC2.6. Unfortunately, this did not work. Although DRC does read the target
curve input, the target response curve is not taken into accout - its
correcting to a linear frequency response - and it has an frequency error
around 17 kHz. I spend more than one hour on a one to one translation from
the old DRC-input file to the DRC2.6 input file, but I could not get rid of
these problems. Does anyone have an idea ??

:with best whishes -
Markus

DRC-input file::


# Normal correction settings

# Normal prefiltering windows (500 ms at 20 Hz, 0.50 ms at 22 Khz)
# Normal peak limiting (6.02 dB Max)
# Minimum phase excess phase allpass recovering to reduce pre-echo
# Normal pre-echo truncation
# Minimum phase postfiltering to reduce I/O latency
# Normal ringing truncation

# BC = Base Configuration
BCInFile = dx32bit.pcm           # hier wird der Name aktualisiert
BCSampleRate = 44100
BCInFileType = F
BCImpulseCenterMode = A
BCImpulseCenter = 0
BCInitWindow = 131072
BCPreWindowLen = 192
BCPreWindowGap = 32
BCNormFactor = 0.0
BCNormType = E

# HD = Homomorphic Deconvolution
HDMultExponent = 1            # wird  auf 1 zurueckgesetzt

HDMPNormFactor = 1.0
HDMPNormType = E
# HDMPOutFile = rmp.pcm
# HDMPOutFileType = F

HDEPNormFactor = 1.0
HDEPNormType = E
# HDEPOutFile = rep.pcm
# HDEPOutFileType = F

# MP = Minimum phase band windowing stage
MPPrefilterType = s
MPPrefilterFctn = B
MPWindowGap = 44
MPLowerWindow = 44100 # 500 ms
MPUpperWindow = 44 # 0.5 ms - wird auf 40 zurueckgesetzt
MPStartFreq = 20
MPEndFreq = 21000
MPFilterLen = 16384           # wird auf 4096 gesetzt
MPFSharpness = 0.25        # wird auf 0.2 gesetzt
MPBandSplit = 3
MPWindowExponent = 1.0
MPHDRecover = Y
MPEPPreserve = Y
MPHDMultExponent = 3    # wird auf 1 gesetzt
MPPFFinalWindow = 44100     #von 0 angepasst
MPPFNormFactor = 0.0
MPPFNormType = E
# MPPFOutFile = rmppf.pcm
# MPPFOutFileType = F

# DL = Dip limiting stage
DLType = M              # geaendert von L
DLMinGain = 0.1 # -20.00 dB Min
DLStartFreq = 20
DLEndFreq = 20000
DLStart = 0.70
DLMultExponent = 3                  # wird auf 1 gesetzt

# EP = Excess fase phase band windowing stage
EPPrefilterType = s
EPPrefilterFctn = B
EPWindowGap = 44
EPLowerWindow = 44100               # 500 ms
EPUpperWindow = 44                  # 0.5 ms
EPStartFreq = 20
EPEndFreq = 21000
EPFilterLen = 16384                 # wird auf 4096 gesetzt
EPFSharpness = 0.25                 # wird auf 0.2 gesetzt
EPBandSplit = 3
EPWindowExponent = 1.0
EPPFFlatGain = 1.0
EPPFOGainFactor = 0.0
EPPFFlatType = D
EPPFFGMultExponent = 3                # wird auf 1 gesetzt
EPPFFinalWindow = 44100                   # wird auf 44100 gesetzt
EPPFNormFactor = 0.0
EPPFNormType = E
# EPPFOutFile = reppf.pcm
# EPPFOutFileType = F

# PC = Prefiltering completion stage
PCOutWindow = 65536
PCNormFactor = 32768                 # , norm an AXCO angepasst
PCNormType = E
# PCOutFile = rpc.pcm
# PCOutFileType = F

# IS = Inversion stage
ISType = T
ISPETType = s
ISPrefilterFctn = B
ISPELowerWindow = 128             # 25 ms - wird auf 128 gesetzt
ISPEUpperWindow = 16                  # 0.5 ms - wird auf 16 gesetzt
ISPEStartFreq = 20
ISPEEndFreq = 21000
ISPEFilterLen = 1024                        # wird auf 1024 gesetzt
ISPEFSharpness = 0.50
ISPEBandSplit = 3
ISPEWindowExponent = 0.85             # wird auf 0.8 gesetzt
ISSMPMultExponent = 4                    # wird auf 2 gestezt
ISOutWindow = 65536
ISNormFactor = 0.0
ISNormType = E
# ISOutFile = ris.pcm
# ISOutFileType = F

# PL = Peak limiting stage
PLType = M
PLMaxGain = 2.2 # 6.85 dB Max
PLStart = 0.80
PLStartFreq = 20
PLEndFreq = 20000
PLMultExponent = 3                          # wird auf 1 gesetzt
PLOutWindow = 65536                    # von 0 angepasst
PLNormFactor = 1.0                     # 1.0 von 0.0 angepasst
PLNormType = E
PLOutFile = dxf.pcm
PLOutFileType = F

# RT = Ringing truncation stage
RTType = s
RTPrefilterFctn = B
RTWindowGap = 44
RTLowerWindow = 44100 # 500 ms
RTUpperWindow = 44 # 0.5 ms
RTStartFreq = 20
RTEndFreq = 21000
RTFilterLen = 1024
RTFSharpness = 0.25
RTBandSplit = 3
RTWindowExponent = 1.0
RTOutWindow = 0
RTNormFactor = 0.0
RTNormType = E
# RTOutFile = rrt.pcm
# RTOutFileType = F

# PS = Target respose stage
PSFilterType = T
PSInterpolationType = G
PSMultExponent = 3                   # wird auf 1 gesetzt
PSFilterLen = 65535
PSNumPoints = 0
PSPointsFile = bk-2.txt               #von bk-3 angepasst-wird auf
targetdrc1.txt
PSMagType = D
PSOutWindow = 0                       # 0, von 65535 angepasst
PSNormFactor = 0.0                 # 0.0 von 1.0 angepasst
PSNormType = E
# PSOutFile = rps.pcm
# PSOutFileType = F

# MC = Mic compensation stage
MCFilterType = T
MCInterpolationType = G
MCMultExponent = 3
MCFilterLen = 65535
MCNumPoints = 0
MCPointsFile = wm-61a.txt
MCMagType = D
MCOutWindow = 65536
MCNormFactor = 0.0                     # 0.0 von 1.0 angepasst
MCNormType = E
MCOutFile = rmc.pcm
MCOutFileType = F

# Minimum phase filter extraction stage
MSMultExponent = 3
MSOutWindow = 65536
MSNormFactor = 1.0
MSNormType = E
# MSOutFile = rms.pcm
# MSOutFileType = F

# Test convolution stage
TCNormFactor = 32768.0           # 32768.0 von 1.0 angepasst
TCNormType = M
TCOutFile = dxtc.pcm         # von rtc.pcm angepasst
TCOutFileType = F

Hi Uli,
It’s very kind to propose to write an utility ;)

Let’s imagine a command like “filter.exe filter.txt
filter.pcm” and “filter.ini”

Filter.ini:
FilterType = L (or M ? what is best ?)
FilterLen = 65535
OutWindow = 32768

Filter.txt:
   0.000   0.000
  20.000   0.000
2000.000   0.000
2100.000   0.000
2200.000   0.000
2300.000   0.000
2499.197  -0.001
2499.870  -0.001
2500.543  -0.001
2501.216  -0.002
….
19995.59  -3.617
19996.27  -3.620
19996.94  -3.624
19997.61  -3.627
19998.28  -3.631
19998.96  -3.634
19999.63  -3.638
21500.00  -3.638
22050.00  -3.638

filter.pcm will be a mono 44.1k 32bits float impulse
ready to be merged with sox in a stereo wav used in
foobar .
Best regards and many thanks
François



		
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