Pow2Fract32

Overview

Computes 2^x using a fast polynomial approximation.

Discussion

This module computes 2^x for fractional input values. The input is in Q6.26 and the output is in Q16.16. The module uses a polynomial based approximation to the pow2() function and the result is accurate to within 0.04 dB (when you look at the result on a db20 scale). The maximum error occurs for very small input values. Over most of the usable range the error is within 0.004 dB.

Module Pack

Standard

ClassID

classID = 173

Type Definition

typedef struct _ModulePow2Fract32
{
ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
} ModulePow2Fract32Class;

Pins

Input Pins


Name	in
Description	Input signal
Data type	fract32
Channel range	Unrestricted
Block size range	Unrestricted
Sample rate range	Unrestricted
Complex support	Real

Output Pins


Name	out
Description	Output signal
Data Type	fract32

Matlab Usage

File Name: pow2_fract32_module.m 
 M = pow2_fract32_module(NAME) 
 Creates an Audio Weaver module that computes 2^x using a fast polynomial 
 approximation.  The input is in Q6.26 format and the output is in  
 Q16.16 format.  Arguments: 
    NAME - name of the module.