Table 1

Comparison Digital Signal Processing (DSP) tools for built-in systems

Product name	Year	Company a manufacturer	Quality factor
DSP Lib	2001	New IT Labs	48
Sound Forge4.5	1999	Sonic Foundry Inc	48
DSP BlockSet+Simulink+Matlab	2000	MathWorks	45
Wave Lab 2.0	1998	Steinberg	43
Cool Edit Pro 1.1	1997	Syntrillium	42
DspWorks	1997	Momentum Data Systems	30
Gold Wave 3.24	1997	Chris S.Craig	27
Spectra Plus 2.32.02	1998	Sound Technology	27

Table 2

Interpret quality factor

Component criterion
Year	2001	1999	1997	1998	1997	1998	2000	1997
Displaying of signals	16	11	8	12	8	6	8	4
Sound IN/Out	5	9	9	9	9	5	2	6
Filtering	5	11	13	10	10	5	9	0
Sound generation	0	0	0	0	0	0	0	0
Fourier transformation	5	6	5	4	0	7	10	7
Viewing spectrum	17	11	7	8	0	7	16	10
Quality factor	48	48	42	43	27	30	45	27

Table 3

Comparison signal displaying features

Feature
Editing		1	1	1	1
Zooming for axis OT, OY	2	2	2	2	1	1	1	1
Scrolling for axis OT, OY	2	2	2	2	2	1	1	1
Block selection		1	1	1	1		1
Changing division quantity on axises	2	1	1	1	1
Axis division options (sample,time)	1	2		2
Autozooming on OY axis	1					1
The simultaneous view of several signals	1						1
Change of a notation	2
Different representations of signals	2
Print Signal						1	1	1
Plugins		1		1			1
Signal transforms	2				1	1	2
Clipboard		1	1	1	1	1		1
Localization (different languages)	1	0		1
Total	16	11	8	12	8	6	8	4

Table 4

Input/Output sound

Feature
Formats	1	3	3	3	3	2	1	1
Compression		1	1		1			1
Number of bit	1	1	1	2	1	1	?	1
Sound frequency	2	2	2	2	2	1	?	1
Microphone recording		1	1	1	1			1
Stereo	1	1	1	1	1	1	1	1
Total	5	9	9	9	9	5	2	6

Table 5

Sound filtering features

Feature
Filters types	2	1	1	1	1	1	3
Filtering modes	2	2	3	2	3	2	2
Graphic ”—•, €—•		1	1	1
Vector ”—•, €—•	1				1	1	1
EQ (Equalizer)		2	2	2	1		1
Fine tuning of parameters in EQ		1	2	2	1
Œ­ŽŁŽŻŽŤŽá­Žáâě EQ		2	2		1		1
Presets (base filtes)		2	2	2	2	1	1
Total	5	11	13	10	10	5	9	0

Table 6

Comparison of signal generation

Feature

Table 7

Fourier transformation

Feature
FFT Block size	1	2	2	1		2	3	2
Windows	1	1	1	?		2	2	2
Slices displayed	3	2	1	1		1	3	1
Logarithmic scale		1	1	1		1	1	1
Frequency, amplitude mode				1		1	1	1
Total	5	6	5	4	0	7	10	7

Table 8

Tools for viewing signal spectrum

Freature
Freq min	3	2	2	2		1	3	2
Freq max	3	2	2	2		1	3	2
dB Ceiling	3	2	1	1		1	3	1
dB Floor	3	2	1	1		1	3	1
FFT table						1	1	1
Viewing modes	2	3	1	1		2	3	3
Using Mouse	2
Localization	1			1
Total	17	11	7	8	0	7	16	10