what's new.txt

VCL component dsplab , STFT and SPECTRUM viewer, real time

DSPLAB version history

===============================================================================================
Version 2.05 - December 2005
	dspFFT.pas  
		procedure CalculateMagnitudes. The magnitude of DC was corrected.

	dspIIRFilter.pas
		Added new function to get Frequency response of IIR filter
		function GetFrequencyResponse(Frequency: TdspSingle): TdspSingle;
 
	Demos\IIR\IIRPlot
		Added new demo - how to plot frequency response of IIR filter.

 
Version 2.04 - June 2004
	dspIIRFilters.pas
		Sometimes the initialization of component was wrong. It was corrected.   

	dspFFT.pas
		A complex inverse FFT was wrong. It was corrected.

	Demos\Sound\Stream\Main.pas
		FFT convolution filter was corrected.


Version 2.03 - January 2004

	dspIIRFilter.pas

		Some methods to prevent the bad effects of denormal numbers are added.
		The major problem with denormal represented numbers is their processing time. 
		It is much slower than for normal represented numbers. When almost all 
		the processed numbers are denormal, CPU load increases a lot and can affect 
		the stability of real-time applications, even on the fastest systems.

		property ManualReset: Boolean; default false;
		ManualReset property was added. Set this property to true if you want to change 
		the filter parameters (frequencies and filter kind) during data processing. 
		Usually (ManualReset = false) when the filter parameters are changed 
		the internal buffers are cleared. So you can get some distortions at the 
		processed signal. 

		procedure Reset;
		The procederu Reset was added
		This procedure clears the internal buffers. 
					
	dspTypes.pas
	dspComplex.pas

		Some definitions of types are corrected.

===============================================================================================