WBFM Receive: Difference between revisions

Latest revision as of 18:07, 22 August 2023

Hierarchical block for demodulating a broadcast FM signal.

The input is the downconverted complex baseband signal (gr_complex).

The output is the demodulated audio (float).

Compared to WBFM Receive PLL, this one does a simple mono demodulation with deemphasis

Audio Decimation: How much to decimate Channel Rate to get to audio. (integer)

Tau: Preemphasis time constant (float) - typically 75e-6 (US) or 50e-6 (Europe)

Implementing an FM broadcast band receiver is really easy with the WBFM Receive Block.

@@ Line 10: / Line 10: @@
 == Parameters ==
-; Quadrature Rate
+; Channel Rate
 : Input sample rate of complex baseband input. (float)
 ; Audio Decimation
-: How much to decimate quad_rate to get to audio. (integer)
+: How much to decimate Channel Rate to get to audio. (integer)
+; Deviation
+: FM modulation deviation. Standard FM broadcast uses 75 kHz
+; Audio Pass
+: Low pass filter rolloff frequency
+; Audio Stop
+: Low pass filter cutoff frequency
+; Gain
+: Audio gain
+; Tau
+: Preemphasis time constant (float) - typically 75e-6 (US) or 50e-6 (Europe)
 == Example Flowgraph ==
@@ Line 20: / Line 35: @@
 Implementing an FM broadcast band receiver is really easy with the WBFM Receive Block.
-[[File:Pluto_FM_fg.png|800px]]
+[[File:Broadcast_FM_fg.png|800px]]
 == Source Files ==