Displaying 20 results from an estimated 2000 matches similar to: "Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off""
2010 Jan 13
2
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
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2010 Jan 13
1
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
<body bgcolor="#ffffff" background="https://img.web.de/v/p.gif" class="bgRepeatYes" style="background-repeat: repeat; background-color: rgb(255, 255, 255); color: rgb(0, 0, 0); font-size: 9pt; padding-left: 0px;" ><p>Hi Jean-Marc,</p>
<p> </p>
<p>yes, I tested with floating point. It is only a fixed point
2010 Jan 14
2
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi Jean-Marc,
yes, problem exists in narrowband-mode, too.
I already twiddled with max_gain, but did not have real success. I changed line 337 of ltp.c (function pitch_gain_search_3tap_vq)
if (sum>best_sum && gain_sum<=max_gain) {
to
if (sum>best_sum && gain_sum<max_gain) {
-- that stabilizes speex for 2000 Hz and 2200 Hz input on quality setting 7 (23800
2010 Jan 04
0
Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi Jean-Marc, all,
I didn't get any response to my issue up to now and would like to now if anyone can reproduce this behaviour and if there is some idea what happens. I am willing to fix this issue, but because I do not know the internals of speex, I need some advice on how to proceed...
best regards,
Frank
Frank Lorenz <Frank_wtal at web.de> hat am 21. Dezember 2009 um 10:49
2010 Jan 13
0
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi Frank,
Sorry, I *do* care about the problem and just happen to be overworked at
the moment. What I suspect is that the pitch gain gets close enough to
unity that the loss makes it bust. Did you test with the floating-point
code?
Jean-Marc
On 2010-01-13 03:45, Frank Lorenz wrote:
> Hi,
>
> is no one willing to spent some effort on this topic? At least it would
> be good
>
2010 Feb 01
1
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi Jean-Marc,
my answers: see below. Any good ideas how I should proceed?
Jean-Marc Valin <jean-marc.valin at usherbrooke.ca> hat am 1. Februar 2010 um 13:09 geschrieben:
> Hi Frank,
>
> On 2010-02-01 05:56, Frank Lorenz wrote:
> > I get really strange results when comparing floating and fixed point
> > versions of interal variables of the ltp, so either something is
2010 Jan 14
0
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
What happens if you change that line:
if (cumul_gain > 262144)
to use a smaller value? What value works OK (if any)?
One more thing, when things go wrong, do they eventually go back to
normal or does the codec never recover? It's unavoidable that the audio
goes bad for a short period of time because of the long-term predictor.
Jean-Marc
On 2010-01-14 05:57, Frank Lorenz wrote:
>
2010 Feb 02
1
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi Jean-Marc,
I'm currently trying to analyze the LPC synthesis filter. For this, can you please tell me the exact format of the LPC coeffs (in variable interp_qlpc), please?
cheers,
Frank
-----Urspr?ngliche Nachricht-----
Von: "Frank Lorenz" <Frank_wtal at web.de>
Gesendet: 02.02.10 11:00:16
An: jean-marc.valin at usherbrooke.ca
CC: speex-dev at xiph.org
Betreff: Re:
2010 Feb 04
1
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
O.k., some more info:
I just tested bandwidth widening to fix this. But I need to go to gamma values below 0.9 to become stable -- clearly too much widening, I think.
I looked inside the Levinson-Durbin algorithm next. The lines
#ifdef FIXED_POINT
r = DIV32_16(rr+PSHR32(error,1),ADD16(error,8));
#else
r = rr/(error+.003*ac[0]);
#endif
look interesting. While for floating point,
2009 Dec 21
0
Fwd: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
An update:
I found that the "ADD32: output is not int:" messages are caused by the enhancer. When I turn the enhancer off, the messages vanish, but the "freak out" of the codec is still there - so the problem seems not to be related to the overflow messages.
best regards,
Frank
---------- Urspr?ngliche Nachricht ----------
Von: Frank Lorenz <Frank_wtal at web.de>
An:
2010 Jan 20
1
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi Jean-Marc,
do you have any other ideas what to look for? Or do you currently debug yourself? As I already wrote, I'm out of ideas...
best regards,
Frank
Frank Lorenz <Frank_wtal at web.de> hat am 18. Januar 2010 um 16:39 geschrieben:
> Yes, I did.
>
> As mentioned earlier, only the enhancer inside the docoder produces a lot of overflow messages (it points to lines 68
2010 Jan 14
1
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi again,
I tested lower cumul_gain limit values. In fact, I reduced the value to 240000, 230000, 220000, ..., 20000, 10000, 5000, 2000, 1000, 500. (quality 7, complexity 2)
For input signal 2000 Hz, the values 190000, 130000, 60000, and 1000 look o.k., all others don't. For 500, the (zoomed out) waveform shows some kind of amplitude ripple -- i think, this value is definetely too low.
I
2010 Jan 15
0
FW: Re: Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Did not send this to speex-dev mailing list by error...
-----Urspr?ngliche Nachricht-----
Von: "Frank Lorenz" <Frank_wtal at web.de>
Gesendet: 14.01.10 14:03:22
An: Jean-Marc Valin <jean-marc.valin at usherbrooke.ca>
Betreff: Re: [Speex-dev] Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi Jean-Marc,
The codec mostly
2010 Jan 18
0
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Yes, I did.
As mentioned earlier, only the enhancer inside the docoder produces a lot of overflow messages (it points to lines 68 and 69 inside ltp.c). When I turn the enhancer of (via SPEEX_SET_ENH control), the codec runs without any messages from the FIXED_DEBUG thing, regardless if the output signal is o.k. or not.
best regards,
Frank
Jean-Marc Valin <jean-marc.valin at
2010 Feb 05
0
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi Jean-Marc,
I did what you proposed. I changed the levinson durbin algorithm to:
{
int i, j;
spx_word16_t r;
spx_word16_t error = ac[0];
for (i = 0; i < p; i++)
lpc[i] = 0;
if (ac[0] == 0)
{
//for (i = 0; i < p; i++)
// lpc[i] = 0;
return 0;
}
for (i = 0; i < p; i++) {
/* Sum up this iteration's reflection coefficient
2009 Dec 18
0
Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Hi,
I'm quite sure we found a bug inside the codec (1.2rc1, wideband mode). It only
occurs when speex is compiled with the FIXED_POINT flag.
I feed in a 2000 Hz sine wave (-15 dBFS). When I simulate a single frame loss
(i.e. pass a null pointer to speex_decode_int as second parameter for just one frame), the decoder
starts to freak out a second later: It produces horrible noise with 0 dBFS.
2010 Feb 02
1
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Jean-Marc Valin <Jean-Marc.Valin at USherbrooke.ca> hat am 1. Februar 2010 um 17:29 geschrieben:
> Can you look at the residual signal? i.e. what it looks like after the pitch is
> removed. Any significant difference there? Also, the pitch gain can be
> informative.
>
I catched the "orignal" residual (st->exc from line 400 inside nb_celp.c) plus the
2010 Feb 02
0
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
Just had a look and the fixed-point residual *does* look odd. That's worth
investigating (though I don't think it's related to LPC stability).
Jean-Marc
Quoting Frank Lorenz <Frank_wtal at web.de>:
> Jean-Marc Valin <Jean-Marc.Valin at USherbrooke.ca> hat am 1. Februar 2010 um
> 17:29 geschrieben:
>
> > Can you look at the residual signal? i.e. what it
2010 Feb 03
1
Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
You mean the "real" (not the synthesized) residual? What is odd in your opinion? These glitches I mentioned or something else?
I replaced the interpolated lpc (variable "interp_lpc") with the original lpc (variable lpc) for residual generation. This makes the situation worse, so lpc interpolation seems to "smooth" the error and reduces it. I will check the
2009 Jun 25
3
xen-create-image: command not found?
Hello,
after I fixed one problem, the next one raised up. I am trying to create a guest domain. I specified the configurations in /etc/xen-tools/xen-tools.conf and I ran
$sudo xen-create-image --hostname=virtualrouter1 --role=udev
the output is: sudo: xen-create-image: command not found
I searched all directories for a file with this name but couldn''t find any. Is this possible? I am