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(8.D.2.4) Db10Approx

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.

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