Delay: Difference between revisions

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== Example Flowgraph ==
== Example Flowgraph ==


Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI.  Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.
This flowgraph is taken from the [[QPSK_Mod_and_Demod]] tutorial. The Delay is used to match the transmit data to the receive data.
 
[[File:Qpsk_stage6_fg.png|800px]]


== Source Files ==
== Source Files ==


; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/lib/delay_impl.cc delay_impl.cc]


; Header files
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/lib/delay_impl.h delay_impl.h]


; Public header files
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/include/gnuradio/blocks/delay.h delay.h]


; Block definition
; Block definition
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/grc/blocks_delay.block.yml blocks_delay.block.yml]

Latest revision as of 14:54, 9 December 2023

Delay the input by a certain number of samples. Positive delays insert zero items at the beginning of the stream. Negative delays discard items from the stream. You cannot initialize this block with a negative delay, however. That leads to a causality issue with the buffers when they are initialized. If you need to negatively delay one path, then put the positive delay on the other path instead.

Note that users have had issues when delaying by very large numbers.

Parameters

(R): Run-time adjustable

Delay (R)
Number of samples/items to delay by

Example Flowgraph

This flowgraph is taken from the QPSK_Mod_and_Demod tutorial. The Delay is used to match the transmit data to the receive data.

Qpsk stage6 fg.png

Source Files

C++ files
delay_impl.cc
Header files
delay_impl.h
Public header files
delay.h
Block definition
blocks_delay.block.yml