search for: 5ms

Hi, I have a question regarding the Asterisk Packet Time for SIP Calls. It is hardcoded at 20ms but when I do an RTP Analysis on a stream it is clear that these packets are not spaced out at 20ms. In general you see something like: Packet 50 - Delay 50ms Packet 51 - Delay 5ms Packet 52 - Delay 5ms Packet 53 - Delay 50ms Packet 54 - Delay 5ms Packet 55 - Delay 5ms Is there anyway to space them out evenly at 20ms?? This is causing problems with the Sipura SPA2000 on our network. The SPA does not like this and is treating many packets as lost packets (even though an E...

...; speex_encoder_ctl(st, SPEEX_GET_LOOKAHEAD, &lookahead); >> ... >> nb_encoded = -lookahead; >> >> Can someone explain what this means? > > The lookahead is the number of samples you need to discard at the > start. > > Jean-Marc In my application, even 5ms (110 samples at 22KHz) matters. So what should I do to avoid discarding samples at the beginning? 1. Turning off look ahead? 2. Padding 0's at the beginning.

...ridge functionality together with tc to emulate delay, jitter, packet loss, duplication, reordering etc. for testing purposes in our lab against our VoIP products. I just recognized, that a basic bridge just with it''s minumum configuration of 2 network interfaces creates latency of approx. 5ms on very low traffic. This seems to be independent on CPU speed. I tried on 2 GHz PC while having just 64kBit traffic with packet size of about 300bytes. I am using Knoppix 3.82 which is actually a debian Live-CD Linux, Kernel 2.6.11. For some reason they put iproute2 041019 on this distro, which is...

Hi,I'am new to speex,i have a question: Suppose i have two frames:frame1(5ms),frame2(10ms),And i don't want to do aec in middle 5ms frame. Can i just link them in frame1(5ms)....000000(5ms).....frame2(15ms),then do AEC with recorded buffer(20ms)? _________________________________________________________________ ???MSN??????????????????? http://mobile.msn.com.cn/ ------...

Hi, Live audio (especially music) applications usually need a total latency of less than 5ms. Correct me if I am wrong but the minimum latency of the Opus codec is 2.5ms (encoder) + 2.5ms (decoder) = 5ms? Is there any way to go down to, say 1.25ms frame size? One characteristic of wireless radio mic links, if that helps, is that they usually only need a frequency response from 50Hz to...

Ok, let me first explain why 5ms matters, even they are 0's, in my particular application. I am working on a speech synthesis system. The basic idea is concatenating pre-recorded phonemes or words into longer sentences. So any missing or extra samples, even it is as short as 5~10ms, cause very noticeable discontinuiti...

...the performance of one TCP connection over two symmetric paths. Packets are sent to two paths alternatively. I found that when the latency of each path are within 1ms, the overall TCP throughput is the *sum* of the throughput of the two paths. However, when the latency of the two paths increases to 5ms, the overal TCP throughput drops to the throughput of a *single* path. Has anyone studied similar problem? What makes the performance go down? I use Fedora Core 3 and 4, teql and netem for my emulation. _______________________________________________ LARTC mailing list LARTC@mailman.ds9a.nl htt...

Hi, I'm having a problem with some model of HP printers (specifically 5Ms and 8100s) not printing landscape when accessed via SAMBA (version 3.0.14a-2). The problem is actually visible in print preview on the windows box. But have the same computer print to the printer directly and there's no problem. I'm presuming this has something to do with the way SA...

...)implement unit storage for a speech synthesizer that handles these issues, I suggest you take a look at the available literature on speech synthesis. Wikipedia seems to be a reasonable starting point: http://en.wikipedia.org/wiki/Speech_synthesis Jia Pu ?rta: > Ok, let me first explain why 5ms matters, even they are 0's, in my > particular application. > > I am working on a speech synthesis system. The basic idea is > concatenating pre-recorded phonemes or words into longer sentences. So > any missing or extra samples, even it is as short as 5~10ms, cause very &gt...

...You could set the overlap to > > > 0, but that would give you some nasty artifacts. > > > You can also resample with smaller block sizes. In the example I used > 20ms > > > blocks and 50% overlap. If you use 10ms blocks and 50% overlap, latency > > > sinks to 5ms. > > > > How quality and CPU usage depends from block size? > > Looking at edge case - 1 sample blocks - I should have <1 sample latency, > > but something should be wrong here, e.g. required CPU power may be > > infinite, no? :) > > > > > Higher bl...

...quot;)$parseDouble(as.character(i))) user system elapsed 4.884 0.000 4.900 i.e. 5 milliseconds per very simple call on a very fast cpu. JNI calls themselves are said to be pretty fast nowadays (10...40ns). It probably goes accross reflection but still doing pretty much nothing useful in 5ms is horrible benchmark. Is that expected rJava performance? Cause if it is, this means it is completely usuitable for exchanging data with Java. ( I can probably bulk up data in data frames and pass it as a single call to do something with it but then either way i have to do conversion between bulk...

...the figure given in celt_alloc() and/or the folling loop, which is populating the allocated memory.? ?The other allocations seem ok. thanks a lot, Marko. ? ? our config: ?- version = 0.9.1 ?- ARM9, FIXED_POINT, DOUBLE_PRECISION, VAR_ARRAYS ?- f<s> = 48kHz ?- frame_size = 240 (p.ch.) (--> 5ms)? ?- rate = 128 kbit/s (stereo) ?- vbr_rate = 0 ?- prediction = 2 ?- complexity = 10 ? ? -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/opus/attachments/20101203/7085b16a/attachment-0002.htm

...92/core i7), this patch decreases overall cpu usage of drmmode_load_cursor_argb from 4.6ms to ~90us and lets nv50_crtc_cursor_set disappear from perf traces. --- I considered accelerating kernel-side copying with GPU, but it turns out that: - it's slower (120-150us), with frequent bursts (up to 5ms) - not applicable to <nv50 hw, which needs to transform cursor data Putting cursor BO in GART does not conflict with accelarating kernel side copying - times do not change, so it's safe to apply it. --- src/drmmode_display.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git...

> How does an ISP provide a Jitter SLA on a Data T1? Jitter < 5ms? How does > one measure that? You can get a good feel for delay and jitter just by running a continuous ping to a core router on your ISPs network during peak times(or to Google for that matter) and visually monitoring the results. A good, unsaturated link will have extremely consistent respons...

...discovered a new problem in my code ( https://gist.github.com/mregnauld/3f7cdc43b02ec3bbd91641b9333ba072) while seeking in an audio file that is being downloaded. When I seek in random positions (when I call OggPlayer::seek()), while I extract audio samples (when I call OggPlayer::extract() every 5ms, in my test - basically, I just play the audio file), sometimes, I get random errors with ov_read(): - sometimes it returns 0 (end of file) - sometimes it returns an error (like an OV_HOLE error) - sometimes it just crashes And that, even if I seek to a position which is at least 44100 frames (1 s...

...so controls the quality. Higher quality => higher latency. You could set the overlap to 0, but that would give you some nasty artifacts. You can also resample with smaller block sizes. In the example I used 20ms blocks and 50% overlap. If you use 10ms blocks and 50% overlap, latency sinks to 5ms. It could be 50% overlap is complete overkill. It could be it's not enough. It could be how much overlap you need depends on the block size. I need to do some quality testing before I can say for sure :) >> +/** Get the latency in input samples introduced by the resampler. >>...

...c calls): ???? mode_create: 2430 ???? enc_create: 10284 ???? dec_create: 17568 ?- GLOBAL_STACK_SIZE: ???? not sure! (default = 100k ???) ???? 2k is not enough, 5k is ok. ? our config: ?- version = 0.9.1 ?- ARM9, FIXED_POINT, DOUBLE_PRECISION ?- f<s> = 48kHz ?- frame_size = 240 (p.ch.) (--> 5ms)? ?- rate = 128 kbit/s (stereo) ?- vbr_rate = 0 ?- prediction = 2 ?- complexity = 10 ? Why do we need additionally a GLOBAL_STACK_SIZE ? Could these allocations also be redirected to a common method, like celt_alloc() ? It is not really clear to me what is the idea behind the switches VAR_ARRAYS,...

Hi all, I manage network with two connections with l00Mbit In the past when network wasn''t so load everything was OK, now in pick hours load over border server from 1.0 to 1.5 / it isn''t so big / and for me is very strange why I have increasing of ping timeout from 0.5- 5ms in normal hour to 50-100 ms in pick hours.. server is with good hardware AMD 64 Dualcore 3800+ Intel Gigabit Ethernet 1 GB RAM Debian sarge 2.6.16 #2 SMP kernel I use about 240 mangle rules with iptables to mark download traffic and to limit it but when I try to load more rules...

...uality => higher latency. You could set the overlap to >> 0, but that would give you some nasty artifacts. >> You can also resample with smaller block sizes. In the example I used 20ms >> blocks and 50% overlap. If you use 10ms blocks and 50% overlap, latency >> sinks to 5ms. >> > > How quality and CPU usage depends from block size? > Looking at edge case - 1 sample blocks - I should have <1 sample latency, > but something should be wrong here, e.g. required CPU power may be > infinite, no? :) > Higher block size and more overlap =&g...

...urce file (another ~20ms is loading the pre-jit'd image through an ObjectCache). I thought I'd save some time by using getLazyBitcodeModule, since the IR isn't actually needed right away, but this only reduced the parsing time (ie the time of the actual getLazyBitcodeModule() call) to 45ms, which I thought was surprising. I also tested computing the bytewise-xor of the bitcode file to make sure that it was fully read into memory, which took about 5ms, so the majority of the time does seem to be spent parsing. Then I switched back to ParseBitcodeFile, but now I added the "-stri...