db2pow

Convert decibels to power

Syntax

y = db2pow(ydb)

Description

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

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 = 
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

ydb — Input array in decibels

scalar | 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

y — Power measurements

scalar | vector | matrix | N-D array

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

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

GPU Arrays

Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.

This function fully supports GPU arrays. For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).

Version History

Introduced in R2007b