(10-09-2017, 09:04 AM)Nick Wrote:(09-09-2017, 01:30 PM)Cardigan Wrote: CD quality? At 22kHz sampling? No.
That's only because the MP3 example file they're using has that sample rate.
Other vaiants of the same code use the embedded sample rate, so 44.1 etc. are achievable, e.g. look at the RDS-enabled version... the internal rate is 228 kHz, so the input file is upsampled.
https://github.com/ChristopheJacquet/PiFmRds
What's wrong with analogue design? What's next - "use your Raspberry Pi as a tin opener"?
As regards FM bandwidth; we often see the BBC spec of 15kHz bandwidth quoted, but how many dB down is it at that point? What sort of filtering is used, any phase EQ, turnover frequency, all that?
