woodpecker
Member
- Joined
- Aug 7, 2005
- Messages
- 729
Hi folks,
I found by chance that the DMR Trbo decode quality/error rate improved dramatically when a 3kHz low pass filter was applied to the raw audio DSD input stream. I presume this should really be a root raised cosine filter? but does anyone know how to implement it in the source code?
Despite some time looking at the code I struggle to see exactly how the audio samples are collected and how to add a filter, any C gurus out there? It would be nice to have an option to insert such a filter with a command option.
I found by chance that the DMR Trbo decode quality/error rate improved dramatically when a 3kHz low pass filter was applied to the raw audio DSD input stream. I presume this should really be a root raised cosine filter? but does anyone know how to implement it in the source code?
Despite some time looking at the code I struggle to see exactly how the audio samples are collected and how to add a filter, any C gurus out there? It would be nice to have an option to insert such a filter with a command option.