search for: bandpass

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 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe&quot...
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 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/opus/attachments/20150224/a72a3fde/attachment.htm
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 [[alternative HTML version deleted]]
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