Programmer Guide/SPU Reference/AVR: Difference between revisions

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\end{cases}
\end{cases}
</math>
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:;power:
::<var>TYP</var>=<code>4</code> or <code>power</code>
::<var>T</var> is not used
::* each input element X<sub>i,j</sub> is squared
::* same averaging as for TYP</var>=<code>4</code> is performed
::* square root of each output element Y<sub>i,j</sub> is taken
;See also:
;See also:
<[[../#Signal Processing Atoms|SP-atoms]]>
<[[../#Signal Processing Atoms|SP-atoms]]>
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Revision as of 11:44, 16 October 2018

Average input X over evaluation cycles.

[SPU AVR X TYP T RS OUT Y]

input description data type value type default value
X data to be averaged number, vector, matrix variable
TYP averaging method number (int.), string constant
T averaging parameter, depends on method number or n.c. TYP=1→variable
TYP≠2→constant
RS reset flag number or n.c. variable
output description data type value type comment
Y averaged input data same type as X variable


Description

The averaging algorithm is defined by the inputs TYP and T. The atom averages the elements X[i,j]t over evaluation cycles t (i=row index, j=column index, t=cycle counter) and stores the averaged value in the element Y[i,j]t.

The cycle counter t is initialized with 0 and incremented by 1 after each evaluation cycle. The cycle counter is reset, if the input RS is set to a value greater than 0. The input RS is checked each time the SPU is started.

infinite average
TYP=0 or linear
T=0
{\displaystyle Y[i,j]_{t}={\begin{cases}X[i,j]_{t}&{\mbox{if }}t=0\\{\frac {1}{t+1}}(t.Y[i,j]_{t-1}+X[i,j]_{t})&{\mbox{if }}t>0\end{cases}}}
running average
TYP=0 or linear
T>0; T is the (integer) number of averaging cycles
{\displaystyle Y[i,j]_{t}={\begin{cases}{\frac {1}{t+1}}\sum _{z=0}^{t}X[i,j]_{z}&{\mbox{if }}0\leqslant t<T\\{\frac {1}{T}}\sum _{z=0}^{T-1}X[i,j]_{t-z}&{\mbox{if }}t\geqslant T\end{cases}}}
exponential average
TYP=1 or exponential
0<T<1; T is the averaging factor
{\displaystyle Y[i,j]_{t}={\begin{cases}X[i,j]_{t}&{\mbox{if }}t=0{\mbox{ (or }}T{\mbox{ out of range)}}\\{\sqrt {T}}.Y[i,j]_{t-1}+(1-{\sqrt {T}}).X[i,j]_{t}&{\mbox{if }}t>0\end{cases}}}
minimum
TYP=2 or minimum
T is not used
{\displaystyle Y[i,j]_{t}={\begin{cases}X[i,j]_{t}&{\mbox{if }}t=0\\min(Y[i,j]_{t-1},X[i,j]_{t})&{\mbox{if }}t>0\end{cases}}}
maximum
TYP=3 or maximum
T is not used
{\displaystyle Y[i,j]_{t}={\begin{cases}X[i,j]_{t}&{\mbox{if }}t=0\\max(Y[i,j]_{t-1},X[i,j]_{t})&{\mbox{if }}t>0\end{cases}}}
power
TYP=4 or power
T is not used
  • each input element Xi,j is squared
  • same averaging as for TYP=4 is performed
  • square root of each output element Yi,j is taken
See also

<SP-atoms>

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