QT GUI Frequency Sink

A graphical sink to display multiple signals in frequency.

This is a QT-based graphical sink that takes a set of floating point streams and plots the PSD. Each signal is plotted with a different color, and  functions can be used to change the label and color for a given input number.

The sink supports plotting streaming float data or messages. The message port is named "in". The two modes cannot be used simultaneously, and should be set to 0 when using the message mode. GRC handles this issue by providing the "Float Message" type that removes the streaming port(s).

Parameters
(R): Run-time adjustable


 * Type
 * options: [Complex, Float, Complex Message, Float Message]


 * Name
 * title for the plot


 * FFT Size
 * size of the FFT to compute and display. If using the PDU message port to plot samples, the length of each PDU must be a multiple of the FFT size.
 * options: [32,64,128,256,512,1024,2048,4096,8192,16384,32768]
 * default: 1024


 * Spectrum Width
 * options (if Float input): [Full, Half]


 * Window Type
 * options: [Blackman-harris, Hamming, Hann, Blackman, Rectangular, Kaiser, Flat-top]
 * default: window.WIN_BLACKMAN_hARRIS


 * Normalize Window Power
 * options: [Yes, No]


 * Center Frequency (Hz) (R)
 * center frequency of signal (only used for x-axis labels)


 * Bandwidth (Hz)
 * bandwidth of signal (used to set x-axis labels)
 * default: samp_rate


 * Grid
 * options: [Yes, No]


 * Autoscale
 * options: [Yes, No]


 * Average
 * options: [None, Low, Medium, High]


 * Y min
 * default: -140


 * Y max
 * default: 10


 * Y label
 * default: "Relative Gain"


 * Y units
 * default: "dB"


 * Number of Inputs
 * default: 1


 * Update Period (R)
 * default: 0.10


 * Show Msg Ports
 * options: [Yes, No]


 * GUI Hint
 * See GUI Hint

Inputs

 * 'freq'
 * set the center frequency


 * 'bw'
 * set the bandwidth

Outputs

 * 'freq'
 * the frequency where the output plot was double-clicked

Source Files

 * C++ files
 * for Complex input
 * for Float input


 * Header files
 * for Complex input
 * for Float input


 * Public header files
 * TODO


 * Block definition
 * gr-qtgui/grc/qtgui_freq_sink_x.block.yml