Re: [ecasound] reverbs

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Subject: Re: [ecasound] reverbs
From: Jeremy Hall ( )
Date: Sat Sep 11 1999 - 02:26:41 EEST

Hi Kai,

Kai Vehmanen said:
> On Wed, 8 Sep 1999, Jeremy Hall wrote:
> > Does the band filter (efb) work correctly?
> Well, it's not perfect, but does the job most of the time.
I don't think so, at least it behaves in no way like the efs filter.

> > Some of the other band filters produce squealing noises. You'd think that
> > the combination
> [...]
> > -efs:440,6000 -efr:440,6000
> > and
> > -efb:440,6000 -efr:440,6000
> It seems that the band-reject filter "-efr" isn't working.
> On the other hand, the above combintion might still not work,
> as you've used a freq-range of -2560Hz->3440Hz (440Hz being
> the center-freq).

ecasound -i /tmp/in.raw -o /tmp/out.raw -efs:1000,500 -efr:1000,500 -c

sounds similar to a 56K audio stream and is a bit quieter. In contrast,

-efr:50,14 -efr:100,14 -efr:150,14 results in a signal that will clip and
must therefore be -eas:96


as noted before, -ev can produce some strange results, do we wrap

The statistics table is hard to understand.

-ea and -eas: work as advertised

the compressers seem to work as advertised

enm: I think I am not setting it up right.

(audiofx) Mono noise gate enabled; threshold level 75.0000%, threshold
time 40.0000 ms, attack 80.0000 ms, hold 75.0000 ms and release 75.0000

-ep: works as advertised, but decreases volume

-ezx: not tested

-etd and -etr: work fine

oh dear

[jhall@pongo jhall]$ ecasound -i /tmp/in.raw -eft:80
* ecasound v1.5.9r5 (C) 1997-1999 Kai Vehmanen

- [ Chainsetup/Adding a new chain operator ]
Segmentation fault (core dumped)
[jhall@pongo jhall]$

-etf: doesn't make a signifficant diff on a stereo signal and that is whta
I am testing with now

-ef1: produces a high squeal

-ef3: appears to work as advertised

-efb: produces strange results no matter what its options are

-efh and -efl

they seem to do something that is sortta right, but I am hearing pitches
around 400 to 500hz when I set -efh of 1000 but they may be overtones I'll
test with a sine wave later.

gotta go, will continue the evaluation later, but a friend is here.

> Btw; to everybody, if you think some effect is behaving weirdly,
> notify me about it! I've had to do some big changes to the effect
> class-design and haven't yet had the time to test all effects.
> Usually these problems are caused by uninitialized class members
> or something similar. I rarely have to touch the actual
> effect algorithms so these are easy to fix.
> > would produce silence. They don't. I seem to misunderstand the cutoff
> > filters, because I seem to hear pitches in the red zone but distant--am I
> > hearing harmonics in the green zone?
> Well, simple filters like these don't have a very sharp cutoff.
> What parameteres did you use?
> --
> Kai Vehmanen <> -------- CS, University of Turku, Finland
> . - linux audio processing
> . - ambient-idm-rock-... mp3/ra/wav

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