db2mag
Convert decibels (dB) to magnitude
Syntax
Description
Examples
Magnitude of Elements in an Array
For this example, generate a 2-by-3-by-4 array of Gaussian random numbers. Assume the numbers are expressed in decibels and compute the corresponding magnitudes.
rng('default');
ydb = randn(2,3,4);
y = db2mag(ydb)
y = y(:,:,1) = 1.0639 0.7710 1.0374 1.2351 1.1044 0.8602 y(:,:,2) = 0.9513 1.5098 0.8561 1.0402 1.3755 1.4182 y(:,:,3) = 1.0871 1.0858 0.9858 0.9928 0.9767 1.1871 y(:,:,4) = 1.1761 1.0804 1.0861 1.1772 0.8702 1.2065
Use the definition to check the calculation.
chck = 10.^(ydb/20)
chck = chck(:,:,1) = 1.0639 0.7710 1.0374 1.2351 1.1044 0.8602 chck(:,:,2) = 0.9513 1.5098 0.8561 1.0402 1.3755 1.4182 chck(:,:,3) = 1.0871 1.0858 0.9858 0.9928 0.9767 1.1871 chck(:,:,4) = 1.1761 1.0804 1.0861 1.1772 0.8702 1.2065
Input Arguments
ydb
— Input array in decibels
scalar | vector | matrix | array
Input array in decibels, specified as a scalar, vector, matrix, or an array. When
ydb
is nonscalar, db2mag
is an element-wise
operation.
Data Types: single
| double
Output Arguments
y
— Magnitude measurements
scalar | vector | matrix | array
Magnitude measurements, returned as a scalar, vector, matrix, or an array of the
same size as ydb
.
Version History
Introduced in R2008a
See Also
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