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misc/sci/FIRDesign2.lha |
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FIR Filter Designer
===================
The Amiga FIR Filter Designer designs optimized Finite Impulse
Response Filters.
Amiga OS 3.x is required. The program requires a minimum Workbench
screen size of 640x400.
The FIR Filters designed by the program FIR Filter Designer V2.3
can be loaded by the program AudioLab16 from Maurizio Ciccione.
AudioLab16 can be found on the Aminet in the directory /mus/edit.
The problem of designing finite impulse response (FIR) digital
filters experienced great activity in the early 1970`s. Most of
this work was directed at the problem of optimal filter design,
in the weighted Chebyshev sense. The algorithm for this program,
by McClellan, Parks and Rabiner, will design the optimal Chebyshev
approximation for linear phase filters. The Chebyshev optimization
is done very efficiently by means of the Remez exchange algorithm,
and this particular FIR filter design program has found wide use.
The window method filter design process is based upon Fourier series.
It is possible to represent a frequency function as a Fourier series,
whose coefficients represent the coefficients of the filter.
To form a casual filter, the Fourier series is truncated and shifted.
Truncating the Fourier series causes a phenomenon called the "Gibbs
effect" - a spike occurs wherever there is a discontinuity in the
desired magnitude of the filter. To counteract this, the filter
coefficients are convolved in the frequency domain with the spectrum
of a window function, thus smoothing the edge transitions at any
discontinuity. This convolution in the frequency domain is equivalent
to multiplying the filter coefficients with the window coefficients
in the time domain.
History
=======
Date Version Type Comments
---- ------- ---- --------
06/08/98 V2.30 Release - Automatic refresh for Prism window
- Selectable bitwidth for filter taps
- Some minor bugfixes
08/03/98 V2.20 Release - Updated GUI to fit for larger fonts
- Changed registration address
06/02/98 V2.10 Release - Fixed a serious bug with big font sizes
- New ToolType for FONTNAME and FONTSIZE
20/01/98 V2.00 Release - Window method filter design
- Requires OS3.x now
- Improved GUI
- Progress bar
- Extended documentation
- Recompiled with SAS/C V6.58
20/07/96 V1.20 Release - ToolType support
- Filterlength now up to 512 taps
- Internal improvements
- Displays floating point errors
- View log file with external viewer
- Displays also the corrected phase
01/05/96 V1.10 Release - Versions for: MC 68000
MC 68020
MC 68040
- Updated the installer script
- Now compatible with AudioLab16
- Grids in the Prism window
- Some redesigns and optimizations
- Fixed Bug with too small workbench
29/11/95 V1.01 Release - Fixed several Enforcer Hits
- Fixed Bug with not updating gadgets
- Recompiled with SAS/C V6.56
- Less Shareware Requesters
- Installer Script
- Added Pattern in Filerequester
- More Examples
21/07/95 V1.00 Release First AMINET Release
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Contents of misc/sci/FIRDesign2.lha
PERMSSN UID GID PACKED SIZE RATIO CRC STAMP NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic] 121 588 20.6% -lh5- b4c8 May 20 1994 firdesigner/Bandpass.FIR
[generic] 81 588 13.8% -lh5- 5167 May 20 1994 firdesigner/Differentiator.FIR
[generic] 671 1379 48.7% -lh5- 7a07 Aug 4 1998 firdesigner/DISCLAIMER.TXT
[generic] 52228 107060 48.8% -lh5- 668f Aug 6 1998 firdesigner/FIRDesigner
[generic] 11700 38318 30.5% -lh5- 076e Aug 6 1998 firdesigner/FIRDesigner.guide
[generic] 1706 7833 21.8% -lh5- 1562 Aug 6 1998 firdesigner/FIRDesigner.install
[generic] 1601 4189 38.2% -lh5- 0633 Aug 6 1998 firdesigner/FIRDesigner.readme
[generic] 504 1391 36.2% -lh5- 3c4c Jul 16 1996 firdesigner/FIRDesigner.readme.info
[generic] 50122 99156 50.5% -lh5- 0d80 Aug 6 1998 firdesigner/FIRDesigner_020
[generic] 50449 99148 50.9% -lh5- efe3 Aug 6 1998 firdesigner/FIRDesigner_040
[generic] 91 588 15.5% -lh5- 94d9 Nov 29 1995 firdesigner/Highpass.FIR
[generic] 85 588 14.5% -lh5- 75c4 May 20 1994 firdesigner/Hilbert.FIR
[generic] 92 588 15.6% -lh5- 5adb Nov 29 1995 firdesigner/Lowpass.FIR
[generic] 100 588 17.0% -lh5- 00ce Nov 29 1995 firdesigner/Multipass.FIR
[generic] 461 1604 28.7% -lh5- 74d6 Aug 4 1998 firdesigner/ORDERFORM.TXT
[generic] 319 673 47.4% -lh5- 00b8 Mar 8 1998 FIRDesigner.info
[generic] 61 104 58.7% -lh5- c51e Dec 3 1997 firdesigner/Bandpass.WFIR
[generic] 113 589 19.2% -lh5- 2617 Jun 26 1996 firdesigner/Bandpass128.FIR
[generic] 529 1415 37.4% -lh5- bc04 Jul 16 1996 firdesigner/DISCLAIMER.TXT.info
[generic] 223 468 47.6% -lh5- 030e Dec 9 1997 firdesigner/FIRDesigner.guide.info
[generic] 575 6693 8.6% -lh5- b8b3 Aug 5 1998 firdesigner/FIRDesigner.info
[generic] 355 704 50.4% -lh5- e4fd Jul 16 1996 firdesigner/FIRDesigner.install.info
[generic] 60 104 57.7% -lh5- 4862 Dec 3 1997 firdesigner/Highpass.WFIR
[generic] 62 104 59.6% -lh5- 69d2 Dec 3 1997 firdesigner/Lowpass.WFIR
[generic] 101 588 17.2% -lh5- ccc7 Nov 29 1995 firdesigner/Notch.FIR
[generic] 527 1415 37.2% -lh5- 71c8 Jul 16 1996 firdesigner/ORDERFORM.TXT.info
[generic] 64 104 61.5% -lh5- c19b Dec 3 1997 firdesigner/Stopband.WFIR
---------- ----------- ------- ------- ------ ---------- ------------ -------------
Total 27 files 173001 376567 45.9% Aug 7 1998
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