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Hi I used R for the first time yesterday. I wanted to plot the aliasing effect of sampling a 5.5KHz sinusoid at only 8KHz (below the Nyquist limit). So I wrote a small R script that a) plots 1msec worth of a 5.5KHz sin wave b) plots 1msec of the resulting 2.5KHz alias and c) plots the 8 sampling points on the 5.5KHz source wave. I think I have found a bug. The script is as follows: #truesamplingfreq <- 1000*5.5 freqin1msec = 5.5 #aliassamplingfreq <- 1000*2.5 aliasfreqin1msec = 2.5 d...

I understand that the capture/playback signals need to be sync'd for an AEC to adapt. I'm a little bit confused on the requirements of synchronous sampling between the near end (mic/speaker) and the far end (phone line). I have an embedded DSP system with mic and speaker getting 1msec packets containing 8 samples. We can watch the DSP and ISDN clock frames drift and every few minutes we will drop or reuse a packet of samples. According to "Echo Cancellation Demystified" by Alexey Frunze http://www.spiritdsp.com/pdf/article_4.pdf (see section "Incorrect Codec S...

...erstand that the capture/playback signals need to be sync'd for an AEC > to adapt. I'm a little bit confused on the requirements of synchronous > sampling between the near end (mic/speaker) and the far end (phone line). I > have an embedded DSP system with mic and speaker getting 1msec packets > containing 8 samples. We can watch the DSP and ISDN clock frames drift and > every few minutes we will drop or reuse a packet of samples. > > According to "Echo Cancellation Demystified" by Alexey Frunze > http://www.spiritdsp.com/pdf/article_4.pdf (see section &...

...erstand that the capture/playback signals need to be sync'd for an AEC > to adapt. I'm a little bit confused on the requirements of synchronous > sampling between the near end (mic/speaker) and the far end (phone line). I > have an embedded DSP system with mic and speaker getting 1msec packets > containing 8 samples. We can watch the DSP and ISDN clock frames drift and > every few minutes we will drop or reuse a packet of samples. > > According to "Echo Cancellation Demystified" by Alexey Frunze > http://www.spiritdsp.com/pdf/article_4.pdf (see section &...

Thanks Jean-Marc. Is there a Speex trunk for the C64xx I can use? Or do I have to figure what options to turn on (in configure) when building the library? Thanks. Regards, Andy Ngo ----- Original Message ---- From: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> To: ndno72-speex@yahoo.com Cc: jtrantow@ieee.org; speex-dev@xiph.org Sent: Tuesday, December 5, 2006 2:52:02 PM Subject:

In blkback driver, after I/O requests are submitted to Dom-0 block I/O subsystem, blkback goes to ''sleep'' effectively without letting blkfront know about it (req_event isn''t set appropriately). Hence blkfront doesn''t notify blkback when it submits a new I/O thus delaying the ''dispatch'' of the new I/O to Dom-0 block I/O subsystem. The new I/O is