For FM de-emphasis just make frequency response at
receiver flat up to 1KHz, and slope down 2dB@2KHz,
4dB@4KHz and then 9dB@8KHz and 14dB@16KHz. Instead of a
fix value per octave as said too often.
For U.S. transmitters values are slightly higher with
3dB@2KHz, 6dB@4KHz, 12dB@8KHz and 18@16KHz.
This can be a good way to compensate the pre-emphasis at
transmitter side, as shown here:
I think is better to think about it this way, instead of
naming delays of the RC time constant of the low pass
filter made this way at regular FM receivers.
2011/1/4 Rob M0TFO <robpegs@...>
I may of just missed it,but does sdr-radio
support Wide FM?