Overview

Converts from energy to decibels using a fast approximation

Discussion

Converts from energy to decibels using a fast polynomial approximation The function uses a 3rd order polynomial and the maximum error over the entire input range is 1.4e-5 dB.

Type Definition

typedef struct _ModuleDb10Approx
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
} ModuleDb10ApproxClass;

Pins

Input Pins

Name: in

Description: Input signal

Data type: float

Channel range: Unrestricted

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out

Description: Output signal

Data type: float

MATLAB Usage

File Name: db10_approx_module.m

 M=db10_approx_module(NAME)
 Creates an Audio Weaver module that computes the function 10*log10(x)
 using a polynomial approximation.  This converts from energy to decibels.
    NAME - name of the module.