Overview

Computes long term statistics. Fract32 version.

Discussion

This module keeps track of the statistics of the input data. The state variable value holds the statistic result seen thus far.

The statisticsType variable configures which type of computation the block does: 0=Maximum, 1=Minimum, 2=Maximum Absolute Value, Mean=3, RMS=4, StdDev=5, Var=6, AvgEnergy=7.

An optional constructor argument OUTPUTVALUE specifies whether the computed statistic should be output on an output pin. By default, OUTPUTVALUE=0 and the statistic is only stored internally in instantaneousValue. The .reset variable is used to clear history and restart the calculation. The variable .reset is set to 1 when the module is first constructed.

Type Definition

typedef struct _ModuleRunningStatisticsFract32
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 statisticsType;                         // Type of statistics needed.
    fract32 value;                                // Instantaneous output value.
    fract32 mean;                                 // Instantaneous mean value.
    fract32 avgEnergy;                            // State variable for average energy.
    INT32 numBlocksProcessed;                     // Counter for the number of blocks processed.
    INT32 reset;                                  // Used to identify the first block which is processed.
} ModuleRunningStatisticsFract32Class;

Variables

Properties

Name	Type	Usage	isHidden	Default value	Range	Units
statisticsType	int	parameter	0	0	0:7
value	fract32	state	0	0	-60:10
mean	fract32	state	0	0	Unrestricted
avgEnergy	fract32	state	0	0	Unrestricted
numBlocksProcessed	int	state	0	0	Unrestricted
reset	int	state	0	1	Unrestricted

Pins

Input Pins

Name: in

Description: Audio input

Data type: fract32

Channel range: Unrestricted

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out

Description: State value output

Data type: fract32

MATLAB Usage

File Name: running_statistics_fract32_module.m

 M=running_statistics_fract32_module(NAME, OUTPUTVALUE)
 This module keeps track of some of the statistics of the
 input and stores this to the internal state variable value. The
 module uses all samples since the start of processing. A number of
 different statistics can be calculated based on the statisticsType
 parameter. Fract32 version.
 Fract32 version does not support running sum due to overflow issues.
 
 Arguments:
    NAME - name of the module.
    OUTPUTVALUE - Boolean value which specifies whether the module has
         an output pin. If OUTPUTVALUE=0 (the default), then
         the module has no output pin. If OUTPUTVALUE=1, then
         the value variable is output as a single sample on the
         output pin.