It's an interesting idea. For real time work, taking it to the extreme,
putting a bit of latency in there-
the encoder and decoder pair, could over time , generate shortcut tokens
/ lookup for whole words
IE encoder continuously stores the encoded words. (it doesnt know the
word, only the sequence ) and puts marker tags on them, and transmits
the marker tag with the encoded sequence....
at the other end, the decoder continously stores the sequences and the
associated tag.
WHen the encoder finds a fitting sequence that's already been encoded
and a close fit to work already down, it only sends the token tag to
the decoder to look up and reproduce.
IE a form of dynamic lookup table. There must be a name for doing this
in computer science ???
glen
On 29/12/2023 11:54 pm, Tomas Härdin wrote:
fre 2023-12-29 klockan 10:44 +1100 skrev glen english LIST:
Hi Tomas
"codec2 + zip makes for even smaller files"
implying that there is still redundancy to remove in the codec2
encoded voice files ????
That sounds like low hanging fruit to pick.
That is not surprising. In speech you can lower the signal rate by
talking more slowly. This and repetition happens often over the air.
Silence doesn't require more bits to encode than the length of the
silence.
I think Dave posted on his blog a while back that the effective data
rate of human speech is on the order of 1-10 bit/s or so
As for it being low-hanging, variable bitrate may be something to
consider for future modes. If there is silence, perhaps it is enough to
just transmit a carrier? If 14 bits are enough for a frame rather then
28 because reasons, then maybe Manchester code those bits. Or use a
lower baudrate for those bits, but I'm not sure how that interacts with
modem stuff. Oh and that would require a breaking change to the .c2
file format, unless you pad with zeroes
For files this isn't a huge issue I think. Might be fun to cram an
entire 10 hour audio book onto a floppy though
/Tomas
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