Looking to determine the type of audio CODEC being used with SSDR's remote audio mode. Remote audio isn't as clear as main headphone audio, presumably because the main headphone feed is sourced from the DAC.
Whether through Maestro, K6TU's app, or SSDR loaded on a tablet PC and accessed over LAN, audio sounds dirty with a noise component. It's subtle for sure, but there nevertheless.
Possibly at some point in the distant future we can have a choice in CODECs, much like the RemoteRig product where one of several different CODEC options can be selected to best work with the connection rate.
Paul, W9AC
Paul Christensen, W9AC, Elmer
Posted 3 years ago
Tim - W4TME, Customer Experience Manager
Paul Christensen, W9AC, Elmer
Thanks Tim. It seems like scaling is inactive? Over LAN, it should scale closer to the audiophile rates shown below but of course subject to latency concerns with higher rates. Are sample and bit rates fixed at the moment?
"Opus can scale from low bitrate narrowband speech to very high quality stereo music. Supported features are:
- Bitrates from 6 kb/s to 510 kb/s
- Sampling rates from 8 kHz (narrowband) to 48 kHz (fullband)
- Frame sizes from 2.5 ms to 60 ms
- Support for both constant bitrate (CBR) and variable bitrate (VBR)
- Audio bandwidth from narrowband to fullband"
(Edited)
Tim - W4TME, Customer Experience Manager
There seems to be a bug in that part of the OPUS code. We are looking into it as it will become important in SSDR v2.0
Varistor
For example, you don't really need anything beyond 8 kbps VBR mono for CW, while you would need a lot more for ESSB or FM.