Page 67 - Electrical Engineering Dictionary

autoassociative backpropagation network (2) for a random vector x, a measure of the
a multilayer perceptron network that is mean-square variability of a random vector x
trained by presenting the same data at both about its mean:
the input and output to effect a self-mapping. h T i
3 x = E (x − E[x])(x − E[x]) .
Such networks may be used for dimensional
reduction by constraining a middle, hidden
See also autocorrelation, covariance.
layer to have fewer neurons than the input
and output layers.
autodecrementing (1) an addressing
mode in which the value in a register is decre-
autobank an array of autotransformers .
mented by one word when used as an address.
(2) in high-level languages, operation
autoconfiguration a process that deter-
mines what hardware actually exists during
i −− ⇒ i = i − 1
the current instance of the running kernel
at static configuration time. It is done by where i is arbitrary variable, register or mem-
the autoconfiguration software that asks the ory location.
devices to identify themselves and accom- (3) in machine code, more generally, the
plishes other tasks associated with events oc- processor decrements the contents of the reg-
curring during the autoconfiguration of de- ister by the size of the operand data type;
vices. For instance, PCI devices have auto- then the register contains the address of the
configuration capabilities and do not have to operand. The register may be decremented
be configured by users. by 1, 2, 4, 8, or 16 for byte, word, long-
word, quadword, or octaword operands, re-
autocorrelation a measure of the statis- spectively.
tical dependence between two samples of the
same random process. For a random process autoincrementing (1) an addressing
X(t), the auto-correlation is the expectation mode in which the value in a register is incre-
mented by one word when used as an address.
R xx (t 1 ,t 2 ) = E [X (t 1 ) X (t 2 )] .
(2) in high-level languages: operation
See also cross-correlation.
i ++ ⇒ i = i + 1
autocorrelation function the expected
where i is arbitrary variable, register or mem-
value of the product of two random vari-
ory location.
ables generated from a random process for
(3) in machine code, after evaluating the
two time instants; it represents their inter-
operand address contained in the register, the
dependence. The Fourier transform of the
processor increments the contents of the reg-
autocorreclation function is the power spec-
ister by 1, 2, 4, 8, or 16 for a byte, word, long-
trum (power spectral density) for the random
word, quadword, or octaword, respectively.
process.
automated meter reading (AMR) the
autocorrelator a circuit that computes
use of meters which have the capability of
the autocorrelation function.
transmitting at the least consumption infor-
mation to the utility through some means of
autocovariance (1) for a random process
electronic communication.
f(t), ameasureofthevariabilityofthemean-
removed process:
automatic (1) property pertaining to a
h i
C f (t 1 ,t 2 ) = E f(t 1 )f (t 2 ) T process or a device that functions without in-
tervention by a human operator under speci-
T
−E[f(t 1 )]E[f(t 2 ) ]. fied conditions.
c
2000 by CRC Press LLC