Hi, I've had a listen to Jeroen's samples, and to my ears (which work, but aren't golden!), 1300C generally sounds better than the old 1300 codec. The 1300C codec seems to be less "buzzy" on the audio peaks and some parts of speech sound clearer / less mumbled. The 1300C samples also seem to have a bit less bass / low frequency content than the 1300 samples (a good thing IMHO).
For example, in cq_ref_all (KA9Q), the phrase "kilowatt alpha" sounds more distorted / buzzy (clipping?) in 1300, than it does in 1300C. The "cq cq cq" also sounds more distorted in 1300. In hts2_all (these days a chicken is a rare dish), 1300 sounds more mumbled around about the end of "..chicken" going into "is a rare..." than in 1300C. I haven't looked at an FFT, but the mumble sounds like the treble suddenly disappears from the audio in 1300 (sounds odd for female speaker - 1300C seems to maintain its treble and sounds clearer). In vk5dgr_all, it sounds like the audio is overdriven in both 1300 and 1300C, though the reduced bass level in 1300C and the perceived reduced duration of the clicks around the audio peaks (clipping?) make the 1300C sample easier to listen to than the "buzzing" that takes their place in 1300. I think that the word "delta" in this sample is an example of where 1300C might be able to be improved - "delta" is said very quickly and to my ears, it sounds almost like the "ta" sound on the end of it is truncated. 73 ZL2WRW Ross Whenmouth ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
