Documentation

db2pow

Convert decibels to power

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