The factors affecting algorithmic delay are: + there is 320 sample buffer at the encoder, we centre our analysis from on this so that's 160 samples (20ms) + same size buffer for the synthesis stage at the decoder, so another 160 samples (20ms) + the algorithm operates internally on 10ms frames, but we buffer these for transmission, so I think that's an extra 10ms for 2400 and 30ms for 1400/1200 + the phase is not preserved so there is no 1:1 correlation between samples entering the encoder and leaving the decoder.
So I think that's an algorithmic delay of 20+20+10=50ms for 2400 and 20 +20+30 = 70ms for 1400/1200. - David On Wed, 2012-08-22 at 14:30 +0300, YO8RNA wrote: > Hi, > > I am trying to put together some details about Codec2. > For now I am looking into the delays of the Codec2 per bitrates. > As far as I understood for bitrates of 1400 &1200, the frame delay is > 40ms, but I don't know the look-ahead (if any), therefore I can't find > the total algorithmic delay. > For 2000bps and above the framedelay is 20ms, but again, I need to > figure out the total delay. > > Can anyone help here? > > For those who can read html emails, here is a table: > Name > Bit Rate (bps) > FrameDelay > (ms) > look-ahead > delay (ms) > > Total > Algorithmic > delay (ms) > > > Codec2 > 2500 bps > 20ms? > ? > > ?? > > Codec2 > 2400 bps > 20ms? > ? > > ?? > > Codec2 > > 2000 bps > > 20ms? > > ? > > ?? > > Codec2 > 1500 bps > 40ms > ? > > ?? > > Codec2 > 1400 bps > (56bit each > 40ms) > > 40ms > ?? > > ?? > > Codec2 > 1200 bps > ? > > ?? > > ?? > > > 73, > yo8rna > > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
