Composers Desktop Project Forum

My impression is that this issue is know to the CDP team and that they are preparing a new release. Not sure about the time frame though, but all of their efforts are always very appreciated, let's not forget this is a GPL project, and everyone could contribute to the code.

Trying to find the quickest CDP command line way to compress dynamics (amplitude).

The only approach I have found so far is to extract the envelope from a time-domain sound
  ENVEL EXTRACT
and modify this envelope using
ENVEL WARP COMPRESS
possibly post-processing it if necessary and imposing it on the original file,

It seems like a lot of steps necessary, is there a simpler/quicker way?

Thanks!
P

Thanks!

Does anyone else have a take at these artifacts?
Much appreciated!

P

Thanks!

Now here
https://framadrop.org/r/YhMF5xUfNZ#OmoQKr3R06Zrd0P0oEb6nz1IJmkQfFhZKVoAY73aUww=
is a sine sweep in its original form and then processed with
hilite trace 1 sweep.ana sweepTrace.ana
after having been pvoc analyzed using the default parameters of 1024 window size.

What is interesting is that if I set the window size to 2048 the artifacts happen at different times during the sweep.

How did you create that spectrogram by the way?

Stupid me, it is
  spec gain infile.ana outfile.ana gainfactor
sorry for the noise.

Thanks Joe,
great, indeed it does and on Unix I can parse it like
  sndinfo infile.wav | grep "max possible gain" | cut -d " " -f 4
which leaves only the question how to raise gain in the spectral domain.

Hi,
using 7.1 on Linux I do get audible artifacts with hilite trace, which do sound a bit like bit noise or aliasing.
I am attaching a file via
https://framadrop.org/r/lNSvFSYs3t#FzODUss6BYJ9NZHQ4xCXSl50bEL1Gl47oyqv6fViYkM=

which I created with
  hilite trace 3 infile.ana outfile.ana 18 3000
thus leaving only the 18 loudest partials below 3kHz.

This has puzzled me since a long time and happens in all sort of different calls to hilite trace.

Would be great to get any idea and finally make this beautiful algorithm usable again!

BUT...

i am wondering if I can save computation time by
1. pvoc synthesizing an .ana file to .wav
2. running only a peak level analysis (HOW?)
3. and changing the gain of the original .ana file in the spectral domain
avoiding another pvoc anal run.

Any ideas? Thanks!

I am replying to myself here as I found an older post by Richard explaining the intricacies in
http://unstablesound.net/cdpforum/index.php?topic=102.msg422#msg422
which answers my question.

Hi all,

i sometimes find myself in the situation where I'd like to normalize an .ana audiofile in the spectral domain to its maximum level. Is this somehow possible without having to convert it to a .wav time domain file?

Thanks for all ideas!

Who would be the person to address with this wish?
best, P

Hi,
The documentation for CD release 7.0 for SPECNU mention the functions RAND and SQUEEZE, but the 7.1 Linux release on unstablesound.net seems to contain the 6.1.0 version without these functions. Also specnu.c contains a line referring to cdp_version 6.1.0.

I am confused, is this a mistake or have these functions moved somewhere else?

Thanks for all hints!
P

Quote from: Wishart on June 30, 2015, 01:33:43 PM
(A) Any file called "temp" can be overwritten.

Is this specific to soundloom Trevor? Because on my linux box here it doesn't seem to work.

$ cdp_modify loudness 3 lapaloma.wav temp
ERROR: INVALID DATA
ERROR: Cannot open output file temp

Quote from: rwdobson on June 29, 2015, 11:28:18 AM
However, there is indeed an environment variable CDP_OVERWRITE_FILE which can be used to nominate one filename which can be overwritten.

This does not seem to work on my Linux box:

$ CDP_OVERWRITE_FILE=lapalomaNorm.wav; cdp_modify loudness 3 lapaloma.wav lapalomaNorm.wav
ERROR: INVALID DATA
ERROR: Cannot open output file lapalomaNorm.wav

Thanks Richard!
I thought someone must have had had a use for this in the past decades as so many parameters depend on infile length.
cheers, P