Increasing the value at low rate seems to help a bit.

Otherwise, we risk having "temporal holes" in the HF that anti-collapse
can't always fill in.

It would trigger on the second frame of "S"s, causing holes in the spectrum

no dither

That was likely a mistake from a misunderstanding on the SILK bit allocation

Hybrid CBR now simply forces the SILK CBR rate to the "target" value. Also,
we're getting rid of the -2 kb/s offset for CBR, which appeared to be harmful.
In the case of hybrid constrained VBR, the cap is computed in the same way
as the target.

Koen Vos authored 8 years ago and Jean-Marc Valin committed 8 years ago

more conservative scaling of LTP corrs; remove assert that checks for negative residual energy; discard CB entries leading to such negative energies

Koen Vos authored 9 years ago and Jean-Marc Valin committed 8 years ago

The NSQ SSE optimizations are disabled for now because they need to be updated

Only complexity 0-1 now uses the plain non-delayed-decision NSQ since its
quality is pretty bad. Previously 0-3 were using that plain NSQ.

Previously, the bandwidth detection could (e.g.) change the bandwidth
from fullband to superwideband, and the hysteresis would then cause
bandwidth to be stuck in superwideband.

Removes unused 64-bit version

Felicia Lim authored 8 years ago and Jean-Marc Valin committed 8 years ago

Computes a pseudo SNR as the ratio between the running peak signal
energy to instantaneous noise energy. DTX is turned on only if this is
higher than a pre-determined threshold.

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>

Felicia Lim authored 8 years ago and Jean-Marc Valin committed 8 years ago

A frame is marked as valid for DTX if it contains noise or only digital
silence. As before, there is an overhang period of 200 ms and a maximum
consecutive DTX period of 400 ms.

If the new DTX cannot be used because of the complexity setting and
sampling frequency chosen, the SILK DTX will be used instead.

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>