QEDesign is a family of filter design software packages. QEDesign Lite,
QEDesign 1000 and QEDesign 2000 all approach the problem of designing
FIR and IIR filters - this note details the differences and similarities
between these packages. Two advanced packages address multirate filters
- where a change of sample rate is used, either within the system as a
means to reduce computation with QEDesign Multirate, or as the goal of
the system with QEDesign Sample Rate Conversion.
The following tables indicate specific functionality for each version
of QEDesign:
Supported Platforms
|
Platform |
QEDesign family member
|
| QEDesign
Lite
student version |
QEDesign
1000
professional |
QEDesign
2000
Premier |
Win95/NT |
Yes |
Yes |
Yes |
UNIX |
No |
No |
Yes |
Supported Filter Types
|
Type of Filter |
QEDesign family member |
QEDesign Lite |
QEDesign 1000 |
QEDesign 2000 |
Lowpass |
Yes |
Yes |
Yes |
Highpass |
Yes |
Yes |
Yes |
Bandpass |
Yes |
Yes |
Yes |
Bandstop |
Yes |
Yes |
Yes Yes
|
Differentiator |
No |
Yes |
Yes |
Multiband |
No |
Yes |
Yes |
Hilbert Transformer |
No |
Yes |
Yes |
Arbitrary Magnitude (FIR) |
No |
Yes |
Yes |
Halfband |
No |
Yes |
Yes |
Raised Cosine |
No |
Yes
|
Yes
|
Root Raised Cosine |
No |
Yes |
Yes |
Arbitrary Group Delay |
No |
Yes |
Yes |
Maximum Filter Order
|
Type of Filter |
QEDesign family member
|
|
QEDesign Lite
|
QEDesign 1000
|
QEDesign 2000
|
IIR |
12th order |
80th order |
200th order |
FIR with windows |
128 |
2048 |
100,000 |
Equiripple FIR |
64 |
1024 |
50,000 |
Equiripple limit is the same as FIR for all.
IIR Analog Prototypes
|
Type of Filter |
QEDesign family member |
|
QEDesign Lite
|
QEDesign 1000
|
QEDesign 2000
|
Butterworth |
Yes |
Yes |
Yes |
Tschebyscheff |
Yes |
Yes |
Yes |
Inverse Tschebyscheff |
Yes |
Yes |
Yes |
Elliptic |
Yes |
Yes |
Yes |
Bessel |
Yes |
Yes |
Yes |
Digital Transformation Methods
|
Method |
QEDesign family member |
QEDesign Lite |
QEDesign 1000 |
QEDesign 2000 |
Bilinear |
Yes |
Yes |
Yes |
Impulse Invariant |
No |
Yes |
Yes |
Matched Z-Transform |
No |
No |
Yes |
IIR Realization Methods for bilinear
and matched z-transform designs
|
Method |
QEDesign family member |
QEDesign Lite |
QEDesign 1000 |
QEDesign 2000 |
Cascade |
Yes |
Yes |
Yes |
Parallel |
No |
No |
Yes |
Ratio of polynomials |
No |
No |
Yes |
FIR Window Functions
|
Window Function |
QEDesign family member |
QEDesign Lite |
QEDesign 1000 |
QEDesign 2000 |
Rectangular |
Yes |
Yes |
Yes |
Triangular |
Yes |
Yes |
Yes |
Hanning |
Yes |
Yes |
Yes |
Hamming |
Yes |
Yes |
Yes |
Blackman |
Yes |
Yes |
Yes |
Kaiser |
Yes |
Yes |
Yes |
Exact Blackman |
No |
Yes |
Yes |
3 Term Cosine |
No |
Yes |
Yes |
3 Term Cosine with
continuous 3rd Derivative |
No |
Yes |
Yes |
Minimum 3 Term Cosine |
No |
Yes |
Yes |
4 Term Cosine |
No |
Yes |
Yes |
4 Term Cosine with
continuous 5th Derivative |
No |
Yes |
Yes |
Minimum 4 Term Cosine |
No |
Yes |
Yes |
Good 4 Term Blackman Harris |
No |
Yes |
Yes |
Harris Flat Top |
No |
Yes |
Yes |
Dolph-Tschebyscheff |
No |
Yes |
Yes |
Taylor |
No |
Yes |
Yes |
Gaussian |
No |
Yes |
Yes |
System Analysis
|
Domain Type |
QEDesign family member |
QEDesign Lite |
QEDesign 1000 |
QEesign 2000 |
Z-Domain transfer function |
No |
Yes |
Yes |
S-Domain transfer function |
No |
Yes |
Yes |
Compensation Features
|
Features |
QEDesign family member |
|
QEDesign Lite
|
QEDesign 1000
|
QEDesign 2000
|
D to A conversion
|
No |
Yes |
Yes |
Comb Filter Compensation |
No |
Yes |
Yes |
Phase Equalization |
No |
Yes |
Yes |
Plot Options
|
Plot Type |
QEDesign family member |
QEDesign Lite |
QEDesign 1000 |
QEDesign 2000 |
Magnitude |
Yes |
Yes |
Yes |
Log Magnitude |
Yes |
Yes |
Yes |
Poles and Zeros |
Yes |
Yes |
Yes |
Phase |
Yes |
Yes |
Yes |
Group Delay |
Yes |
Yes |
Yes |
Impulse Response |
Yes |
Yes |
Yes |
Step Response |
No |
Yes |
Yes |
Logarithmic Frequency Scale |
No |
Yes |
Yes |
Miscellaneous
|
Features |
QEDesign family member
|
QEDesign Lite |
QEDesign 1000 |
QEDesign 2000 |
Graphical Placement of Poles and Zeros
with simultaneous display of system response |
No |
No |
Yes |
Quad Precision Calculations for critical
designs |
No |
No |
Yes |
|
