Sound-Engine

Dreieckskurve


float deviceValue;       // 1 > deviceValue > 0
float xValue    = 0.0;
float amplitude = 1.0;

while ( bufferSize -- )
{
  buffer++ = ( xValue * amplitude );
  if( ( direction == 1 ) && (xValue >= deviceValue ) )
    direction = -1;
  else if ( ( direction == -1 ) && (deviceValue >= xValue ) )
    direction = 1;
	
  ...
		
  xValue += direction * (1.0 / 64.0 );
}

Sinuskurve


float deviceValue;     // 1 > deviceValue > 0
float amplitude = 1.0;
float phi       = 0.0;

float frequency = exp ( 2 * deviceValue - 2 ) * SAMPLE-FREQ

while ( bufferSize -- )
{
  buffer++ = ( amplitude * cos ( phi ) );
  phi += ( 2.0 * PI * frequency / SAMPLE_FREQ );		
}

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