Displaying 20 results from an estimated 23 matches for "bandpass".
2001 Feb 13
1
bandpass filters in R
Hi,
does anybody have any ideas regarding the easiest and most efficient way
of implementing a bandpass filter in R ?
any help would be truly appreciated.
cheers,
Pat Johnston
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2015 Feb 24
2
Questions regarding OPUS_APPLICATION_AUDIO vs OPUS_BANDWIDTH_NARROWBAND
I have an audio device whose 'driver' gives me Opus encoded frames using
OPUS_APPLICATION_AUDIO and max bandwidth set to OPUS_BANDWIDTH_NARROWBAND.
How does Opus encoder decide the center point of the 4K bandpass filter?
Is it done frame by frame?
--
Tony
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2015 Mar 04
2
adaptive bandwidth
...e fly.
Has anybody on the list tried this?
Kelvin Chua
On Wed, Mar 4, 2015 at 5:53 PM, Dragos Oancea <droancea at yahoo.com> wrote:
> Hi Kelvin,
>
> You can use something like :
> opus_encoder_ctl(enc,OPUS_SET_BITRATE(bitrate));
> opus_encoder_ctl(enc,OPUS_SET_MAX_BANDWIDTH(bandpass));
> bandpass is the audio bandpass , eg: OPUS_BANDWIDTH_WIDEBAND .
>
> You will need to calculate the codec bitrate from the available network
> bitrate (by taking into account the size of the IP+UDP+RTP headers which is
> 40 bytes ) .
> By default the audio bandwidth (bandpass)...
2006 Apr 10
0
Fourier / Bandpass filter help?
...s take a subset of the vector produced by the FFT and go from that back to the initial data frame of [timestamp,events], from which I can go back to the source data and pull out the IPs and so forth. How can I do this? My roommate (an aero engineer) has recommended that I look into implementing a bandpass filter but I'm finding the material to be way over my head.
I'm at the limits of my expertise (I am not an engineer :) so if anyone just wants to point me at the topics I need to study, that would be fine--although pointing out some specific examples would be great as well.
Thanks,...
2015 Mar 04
2
adaptive bandwidth
I am using libopus for my implementation. I wonder if anybody in the list
have any experience on how to make libopus dynamically adjust its bitrate?
On Mar 3, 2015 10:42 PM, "Benjamin Schwartz" <benjamin.m.schwartz at gmail.com>
wrote:
> It sounds like your software isn't adjusting the opus bitrate in response
> to network conditions. For example, many WebRTC
2015 Mar 04
0
adaptive bandwidth
Hi Kelvin,
The audio bandpass setting is only configurable when the encoder is instantiated (eg: start of a Voip call ) , but you can change the bitrate anytime.For example if you can read incoming RTCP packets , you can check if there's reported packet loss , and then lower the bitrate accordingly.Yes, the app has to be aw...
2005 Oct 19
2
Filter design in R?
Dr. Williams,
I ran across your inquiry on one of the R-help mailing lists regarding
digital filter design and implementation. I found no response to your
email in the archives and was wondering if you were able to find anything.
Thanks,
Israel
--
Israel Christie, Ph.D.
Email: ichristie at gmail.com
Phone: 865.766.0214
Mobile: 865.406.4615
2010 Aug 15
2
band pass filter
Hello list,
Is there any way to bandpass filter in R
thanks
nuncio
--
Nuncio.M
Research Scientist
National Center for Antarctic and Ocean research
Head land Sada
Vasco da Gamma
Goa-403804
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2015 Mar 04
0
adaptive bandwidth
Hi Kelvin,
You can use something like :opus_encoder_ctl(enc,OPUS_SET_BITRATE(bitrate));opus_encoder_ctl(enc,OPUS_SET_MAX_BANDWIDTH(bandpass));
bandpass is the audio bandpass?, eg: OPUS_BANDWIDTH_WIDEBAND .
You will need to calculate the codec bitrate from the available network bitrate (by taking into account the size of the IP+UDP+RTP headers which is 40 bytes ) .
By default the audio bandwidth (bandpass) setting is OPUS_BANDWIDTH_FULL...
2003 Aug 11
0
Designing and incorporating a digital filter
I have a time series of data from an electroencephalogram (EEG).
I wish to filter the data to get rid of 50Hz mains 'hum'. I have
'designed' a combination bandpass and notch filter using a web-
site. The site returns the filter in "ANSI C" source code. It is:-
/* Digital filter designed by mkfilter/mkshape/gencode A.J. Fisher
Command line: /www/usr/fisher/helpers/mkfilter -Bu -Bp -o 5 -a
1.0000000000e-02 1.0000000000e-01 -Z 2.0000000000e-01 -l...
2020 Jun 11
1
OPUS encoded data size and bandwidth of encoder
Hey, I am having trouble with the size of the encoded bytes by Opus. I am
also having issue with the Bandwidth ctl.
Here is the scenario.
If I encode 16khz sampled audio:
opus_encoder_ctl(enc,OPUS_SET_MAX_BANDWIDTH(OPUS_BANDWIDTH_WIDEBAND))
opus_encoder_ctl(enc, OPUS_GET_BANDWIDTH(&x)) = 1102
opus_encoder_ctl(enc, OPUS_GET_MAX_BANDWIDTH(&x)) = 1103
average encoded size = 120 bytes
if I
2003 Mar 05
1
Questions about window sizes
...for long/short blocks ?
Why are there so many possible blocksizes - would it be necessary
to analyze the entire track to find the out, which sizes fits best ?
2. How does the encoder decide , whether to use short or long blocks during encoding ?
In earlier versions, it was done "by 4 parallel bandpass filters that detect energy surges",
but Monty said it will be changed.
(http://www.xiph.org/archives/vorbis-dev/200109/0054.html )
Thanks
Stoffke
<p>--- >8 ----
List archives: http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this lis...
2005 Aug 29
1
Previewing oggvorbis files in GNOME...
...ay" command easily at the command line. Also when I type
"sox -h" I get:
sox: Version 12.17.7
Usage: [ gopts ] [ fopts ] ifile [ fopts ] ofile [ effect [ effopts ] ]
gopts: -e -h -p -v volume -V
fopts: -r rate -c channels -s/-u/-U/-A/-a/-i/-g/-f -b/-w/-l/-d -x
effect: avg band bandpass bandreject chorus compand copy dcshift deemph
earwax echo echos fade filter flanger highp highpass lowp lowpass mask
mcompand noiseprof noisered pan phaser pick pitch polyphase rate repeat
resample reverb reverse silence speed stat stretch swap synth trim vibro vol
effopts: depends on effect
S...
2011 Sep 13
1
sox: Failed reading obd-demo.mp3: Do not understand format type: mp3
...the list of supported file formats as "mp3".
[root at host0040 ~]# sox -h
sox: Version 12.18.1
Usage: [ gopts ] [ fopts ] ifile [ fopts ] ofile [ effect [ effopts ] ]
gopts: -e -h -p -q -S -V
fopts: -r rate -c channels -s/-u/-U/-A/-a/-i/-g/-f -b/-w/-l/-d -v volume -x
effect: avg band bandpass bandreject chorus compand copy dcshift
deemph earwax echo echos fade filter flanger highp highpass lowp
lowpass mask mcompand noiseprof noisered pan phaser pick pitch
polyphase rate repeat resample reverb reverse silence speed stat
stretch swap synth trim vibro vol
effopts: depends on effect
Supp...
2008 Nov 06
0
need help with SIGNAL module
..."low". But when I reversed the Wp and Ws parameters, it resulted in an
object with an empty $type instead of $type being "high". I looked at
the source code and found an obvious reason why:
if (length(Wp) == 2) {
warning("buttord seems to overdesign bandpass and bandreject
filters")
if (any(stop))
type = "stop"
else type = "pass"
}
else {
## here we set to "high" or "low", as expected
if (any(stop))
type = "high&...
2009 Sep 17
1
rsync deletes target files after source drive failure
...ata
deleting data/1934-638.1344.04nov27/vartable
deleting data/1934-638.1344.04nov27/leakage
deleting data/1934-638.1344.04nov27/history
deleting data/1934-638.1344.04nov27/header
deleting data/1934-638.1344.04nov27/gains
deleting data/1934-638.1344.04nov27/flags
deleting data/1934-638.1344.04nov27/bandpass
deleting data/1934-638.1344.04nov28/visdata
deleting data/1934-638.1344.04nov28/vartable
deleting data/1934-638.1344.04nov28/leakage
deleting data/1934-638.1344.04nov28/history
deleting data/1934-638.1344.04nov28/header
deleting data/1934-638.1344.04nov28/gains
deleting data/1934-638.1344.04nov28/f...
2011 May 12
1
opus sampling rates
I hope it is OK to ask an Opus question here. If not, please advise the
correct forum.
Regarding the statement "Internally, the codec always operates at a 48
kHz sampling rate, though it
allows input and output of various bandwidths..."
Can I infer from this that it is most CPU efficient to always input and
output PCM data at 48000 samples per sec, regardless of other factors such
as
2015 Feb 24
0
Questions regarding OPUS_APPLICATION_AUDIO vs OPUS_BANDWIDTH_NARROWBAND
...enter point"?
Jean-Marc
On 24/02/15 11:30 AM, Tony wrote:
> I have an audio device whose 'driver' gives me Opus encoded frames
> using OPUS_APPLICATION_AUDIO and max bandwidth set to
> OPUS_BANDWIDTH_NARROWBAND. How does Opus encoder decide the center
> point of the 4K bandpass filter? Is it done frame by frame?
>
> --
> Tony
>
>
> _______________________________________________
> opus mailing list
> opus at xiph.org
> http://lists.xiph.org/mailman/listinfo/opus
>
2011 Nov 17
3
Opus for audiobooks etc
I know the focus for Opus is low delay, but I've been watching its
development with interest because of the potential for audiobook/podcast
use, where latency is practically irrelevant. I hear the upcoming USAC
codec will give good results for this niche (though listening test
results don't seem to be available to the public yet), but I also hear
it'll be extremely patent
2009 May 11
1
22 kHz version of CELT
Hi,
I'd like to know the reasons why CELT supports only signals with sampling
frequency in the range of 32-96 kHz.
In effect, it can clearly outperform speex at high bitrates, and has
potential to be used in high quality voice communications even for 11, 16
and 22 kHz speech signals. It could also compete with SILK codec (to be soon
released by Skype).
See this page for more specifications