SF_Noise_Generator

Sonic Flow Blocks Reference Guide

The purpose of SF_Noise_Generator is to generate white noise with a uniform probability density function. The noise is a pseudo-random number sequence generated with a linear congruential generator (LCG).

SF_Noise_Generator (const char* name = 0);

This is the constructor of a SF_Noise_Generator block. Following attributes of the class are specified in the constructor:

• SF_Noise_Generator
  • class name: "Noise generator"
  • producer: yes
  • consumer: no
• List of input terminals
  • inputs[AMP]
    • input name: "amp"
    • multiple connections: no
    • default value: 1
• List of output terminals
  • outputs[Y]
    • output name: "y"

virtual ~SF_Noise_Generator ();

This is the destructor.

virtual void finish ();

virtual void initialize ();

virtual void execute ();

The initialize - execute - finish chain of function calls is used to carry out the simulation of a block. See SF_Block.

The initialize generates the seed value for the LCG.

The execute carries out the actual simulation process. The output frame is filled according to the following equation:

Y[n] = a * Y[n-1] (modulo m)

   a = 16807 (7^5)

   m = 2147483647 (2^31-1)

The finish does nothing.

enum Input_Indices {AMP};

enum Output_Indices {Y};

Last modified: Wed Dec 2 13:28:47 1998
jarno.seppanen@cs.tut.fi
Audio Research Group