QT GUI Frequency Sink: Difference between revisions

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A graphical sink to display multiple signals in frequency.
A graphical sink to display multiple signals in frequency.


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


Args:
== Parameters ==
* fftsize : 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.
<b>(''R''):</b> <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
* wintype : type of window to apply (see gr::fft::window::win_type)
* Center Frequency : center frequency of signal (only used for x-axis labels)
* Bandwidth : bandwidth of signal (used to set x-axis labels)
* Name : title for the plot
* GUI Hint: See [[GUI Hint]]


Example Flowgraph:
; 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]]
 
== Messages ==
 
=== Inputs ===
 
; 'freq'
: set the center frequency
 
; 'bw'
: set the bandwidth
 
=== Outputs ===
 
; 'freq'
: the frequency where the output plot was double-clicked
 
== Example Flowgraph ==


[[File:Freq-sink-ex.png|700px]]
[[File:Freq-sink-ex.png|700px]]
== Source Files ==
; C++ files
: [https://github.com/gnuradio/gnuradio/blob/main/gr-qtgui/lib/freq_sink_c_impl.cc for Complex input]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-qtgui/lib/freq_sink_f_impl.cc for Float input]
; Header files
: [https://github.com/gnuradio/gnuradio/blob/main/gr-qtgui/lib/freq_sink_c_impl.h for Complex input]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-qtgui/lib/freq_sink_f_impl.h for Float input]
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]
; Block definition
: [https://github.com/gnuradio/gnuradio/blob/main/gr-qtgui/grc/qtgui_freq_sink_x.block.yml gr-qtgui/grc/qtgui_freq_sink_x.block.yml]
[[Category:Block Docs]]

Latest revision as of 19:49, 9 April 2023

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

Messages

Inputs

'freq'
set the center frequency
'bw'
set the bandwidth

Outputs

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

Example Flowgraph

Freq-sink-ex.png

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
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