[Freetel-codec2] Low bit rate codecs volume/gain control

[Suresh Thiriveedi]

Hi,

We are trying the low bit rate, especially 1400 and 700 bps where we see
very low volume levels from the decoded speech. Is there any in-built
AGC/ALC available and do we need to configure/set any to counter this?

Please help.

Thanks
Suresh

[Steve]

I assume you are building your own code, and not using freedv. In that
case, you'll find that freedv and the API multiply and divide by a
scale number. the scale is fixed at 1000.

Take a look at the freedv_api.c code

https://sourceforge.net/p/freetel/code/HEAD/tree/codec2-dev/src/freedv_api.c

On Wed, Feb 24, 2016 at 4:15 AM, Suresh Thiriveedi

Post by Suresh Thiriveedi
Hi,
We are trying the low bit rate, especially 1400 and 700 bps where we see
very low volume levels from the decoded speech. Is there any in-built
AGC/ALC available and do we need to configure/set any to counter this?