VCO

VCO - Voltage controlled oscillator. Produces a sinusoid of frequency based on the amplitude of the input. See VCO (complex) for a complex sinusoidal output.

input: float stream of control voltages;

output: float oscillator output

Parameters

 * Sample Rate
 * sampling rate (Hz)


 * Sensitivity
 * units are radians/sec/(input unit)


 * Amplitude
 * output amplitude

Example Flowgraph
This flowgraph can be found at



For this flowgraph, the standard RTTY tones of 2295 (mark) and 2125 (space) are generated. The calculations for this follow:


 * Choosing a full-scale frequency of 2500Hz with an input of +1.0, the VCO Sensitivity = (2 * math.pi * 2500 / 1.0) = 15708
 * At the output of the Low Pass Filter, a Mark has a value of +1.0 and a Space has a value of 0.0
 * When the output of the Low Pass Filter is +1.0, the input of the VCO is (1.0 * 0.068) + 0.850 = 0.918 That generates a frequency of 0.918 * 2500 => 2295
 * When the output of the Low Pass Filter is 0.0, the input of the VCO is (0.0 * 0.068) + 0.850 = 0.850 That generates a frequency of 0.850 * 2500 => 2125

See Sample_Rate_Tutorial for a discussion of the timing involved in a similar flowgraph.

Source Files

 * C++ files
 * TODO


 * Header files
 * TODO


 * Public header files
 * TODO


 * Block definition
 * TODO