db2pow

Convert decibels to power

Syntax

Description

example

y = db2pow(ydb) returns the power measurements, y, that correspond to the decibel (dB) values specified in ydb. The relationship between power and decibels is ydb = 10 log10(y).

Examples

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Power Values of Random Numbers

Generate a 2-by-4-by-2 array of Gaussian random numbers. Assume the numbers are expressed in decibels and compute the corresponding power measurements.

r = randn(2,4,2);

pows = db2pow(r)
pows(:,:,1) =

    1.1318    0.5944    1.0762    0.9050
    1.5254    1.2196    0.7400    1.0821


pows(:,:,2) =

    2.2795    0.7328    1.1818    1.1789
    1.8921    2.0114    0.9856    0.9539

Use the definition to check the calculation.

chck = 10.^(r/10)
chck(:,:,1) =

    1.1318    0.5944    1.0762    0.9050
    1.5254    1.2196    0.7400    1.0821


chck(:,:,2) =

    2.2795    0.7328    1.1818    1.1789
    1.8921    2.0114    0.9856    0.9539

Input Arguments

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ydb — Input array in decibelsscalar | vector | matrix | N-D array

Input array in decibels, specified as a scalar, vector, matrix, or N-D array. When ydb is nonscalar, db2pow is an element-wise operation.

Data Types: single | double

Output Arguments

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y — Power measurementsscalar | vector | matrix | N-D array

Power measurements, returned as a scalar, vector, matrix, or N-D array of the same size as ydb.

See Also

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