WBFM Transmit

Wide Band FM Transmitter.

Takes a single float input stream of audio samples in the range [-1,+1] and produces a single FM modulated complex baseband output.

The only difference with NBFM Transmit is the size of the internal low pass filter for interpolation. Here it has a cutoff frequency of 16kHz with 2KHz of transition width.

Parameters

Audio Rate

Sample rate of audio stream, >= 16k (integer)

Quadrature Rate

Sample rate of output stream (integer). Must be an integer multiple of audio_rate.

Tau

Preemphasis time constant (default 75e-6) (float)

Max Deviation

Maximum deviation in Hz (default 75e3) (float)

Preemphasis High Corner Freq

High frequency at which to flatten preemphasis; < 0 means default of 0.925*quad_rate/2.0 (float)

Example Flowgraph

This example flowgraph can be found at [1].

Source Files

Python files

[2]

Block definition

[3]