Multiply Const: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
Multiplies input stream by a constant.
Multiplies the input stream by a scalar or vector constant (element-wise if vector).


output = input * constant scalar/vector (element-wise if vector)
output = input * constant


See [[Fast Multiply Const]] for a more performant version of this block.
See [[Fast_Multiply_Const]] for a more performant version of this block for '''scalar''' values only.  


== Parameters ==
{{T-since|3.8}} If the input is a '''not''' a vector, the "Fast" version is automatically invoked (done behind the scenes).
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
 
{{Param-header}}


; Constant (''R'')
; Constant (''R'')
: Constant to multiply the input stream by
: Scalar or vector constant. If the input is a vector, this parameter must be a vector of the same size. To multiply all the input items by the same value, use [[Fast_Multiply_Const]].


== Example Flowgraph ==
== Example Flowgraph ==
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; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/lib/multiply_const_impl.cc If single sample input]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/lib/multiply_const_v_impl.cc If vector input]


; Header files
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/lib/multiply_const_impl.h If single sample input]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/lib/multiply_const_v_impl.h If vector input]


; Public header files
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/include/gnuradio/blocks/multiply_const.h If single sample input]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/include/gnuradio/blocks/multiply_const_v.h If vector input]


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

Latest revision as of 16:34, 24 October 2021

Multiplies the input stream by a scalar or vector constant (element-wise if vector).

output = input * constant

See Fast_Multiply_Const for a more performant version of this block for scalar values only.

Added in 3.8 If the input is a not a vector, the "Fast" version is automatically invoked (done behind the scenes).

Parameters

(R): Run-time adjustable

Constant (R)
Scalar or vector constant. If the input is a vector, this parameter must be a vector of the same size. To multiply all the input items by the same value, use Fast_Multiply_Const.

Example Flowgraph

This flowgraph uses three Multiply type blocks. The top Multiply Const Block and middle Multiply Block are driven by the GUI Chooser to act as a Transmit / Receive switch. The bottom Multiply Const Block is a Volume control, the 'constant' being the 'volume' parameter from the QT GUI Range block.

Note: The lower section is a working 2 meter NBFM receiver.

Selector demo.png

Source Files

C++ files
If single sample input
If vector input
Header files
If single sample input
If vector input
Public header files
If single sample input
If vector input
Block definition
[1]
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