Freeware Listing: Butterworth
- Butterworth Filter
- License: Freeware

This function file is basically for Passive Butterworth Filter for Low pass as well as for High Pass. In input it takes the Pass Band Attenuation, Band Stop attenuation, Band Pass Frequency, band stop frequency, and Filter Type. For Low Pass Type is "0" and for High Pass Type is "1". It finally output the values of Inductors and Capacitors..
- Publisher: Zeeshan Shareef
- Date: 22-02-2013
- Size: 10 KB
- Platform: Matlab, Scripts
- 3-rd order Butterworth low-pass
- License: Shareware

3-th order Butterworth low-pass is a handy audio filter that comes with a minimalistic yet functional interface. The application is compatible with several audio profiles and you can choose the desired mode from the dedicated menu.
3-th order Butterworth low-pass will also allow you to add new channels manually and you can choose the input as well (left or right).
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- Publisher: 7AMP Around Music Portal
- Date:
- Platform: WinOther
- Filter Wiz Lite
- License: Freeware

Active filter design software for lowpass, highpass, bandpass and bandstop electronic filters using resistors, capacitors and op amps. Provides Butterworth, Chebyshev, Elliptic and Bessel Approximations to order 10, with a variety of circuit choices. Schematica 555 timer and active filter design software. Active filter and 555 timer circuit design software..
- Publisher: Schematica Software
- Date: 22-08-2011
- Size: 4777 KB
- Platform: Win2000, Win7 x32, WinOther, WinVista
- Aj Crossover Calculator
- License: Freeware

Solves for inductor and capacitor values for first, second, third and fourth order passive crossover systems for two way speaker systems. Includes Butterworth, Linkwitz-Riley, Bessel, Chebychev, Legendre, Gaussian and Linear-phase type calculations. Depicts circuit with inductor, capacitor, subwoofer and tweeter..
- Publisher: Jimmy Raymond
- Date: 15-01-2011
- Platform: PHP, Scripts
- Networks-n-Filters
- License: Freeware

Networks-n-Filters: Design impedance matching circuits (PI, L, and T) and/or filters (LP, HP, BP) passive/active. Characteristics: Butterworth, Bessel, Chebychev. Orders from 1 -- 7. Linux X-11 app, written in C++ with the FOX GUI toolkit..
- Publisher: nets-n-filters.sourceforge.net
- Date: 18-09-2012
- Size: 5947 KB
- Platform: Linux, Unix
- Digital Resistor-Capacitor (RC) Filter
- License: Freeware

Returns equivalent IIR coefficients for an analog RC filter Usage: [B,A] = RC_FILTER(r, c, fs, type); R is the resistance value (in ohms) C is the capacitance value (in farrads) FS is the digital sample rate (in Hz) type is a character string defining filter type Choices are: 'high' or 'low' This function uses a pre-calculated equation for both of these circuits that only requires the resistance and capacitance value to get a true digital filter equivalent to a basic analog filter. The math behind these equations is based off the basic bilinear transform technique that can be found in many DSP textbooks.
- Publisher: Jeff Tackett
- Date: 26-06-2013
- Size: 10 KB
- Platform: Matlab, Scripts
- Real time filters: GUI
- License: Freeware

You can use 4 types of filters: - Butterworth - Chebyshev 1 - Chebyshev 2 - Elliptic You can use them as: - Lowpass - Highpass - Bandpass - Stopband Showing theirs features in frequency, phase and the z plane. After the desing phase you can apply the designed filter in real time to incoming audio signal from the microphone..
- Publisher: Juan Pablo Ramon
- Date: 21-03-2013
- Size: 297 KB
- Platform: Matlab, Scripts
- ButterParam
- License: Freeware

ButterParam - Fast parameters for a digital Butterworth filter The calculation of filter parameters with BUTTER is expensive. Therefore ButterParam stores calculated parameters in a lookup-table to accelerate repeated calls with the same input. Example: x = rand(10000, 1); % test data [B, A] = butter(3, 0.6); y = filter(B, A, x); The relation of the processing times is: BUTTER=68% / FILTER=32%! With [B, A] = ButterParam(3, 0.6) we get: ButterParam=14% / FILTER = 86%, and the both calls together use 35% of the version with BUTTER. Input and output equal the BUTTER command of the Signal-Processing-Toolbox when used with 3 inputs and 2 outputs: [B, A] = ButterParam(N, Wn, Pass) INPUT: N: Order of the filter.
- Publisher: Jan Simon
- Date: 14-05-2013
- Size: 10 KB
- Platform: Matlab, Scripts
- 1-st order high-pass filter
- License: Shareware

1-st order Butterworth high-pass is a useful sound filter that was designed with a very simple yet functional interface. The application supports audio profiles and you can choose a specific mode from the dedicated menu.
1-st order Butterworth high-pass will also enable you to manually add new channels and you can choose the input as well (left or right).
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- Publisher: 7AMP Around Music Portal
- Date:
- Platform: WinOther
- 1-st order low-pass filter
- License: Shareware

1-st order Butterworth low-pass is a handy audio filter that comes with a minimalistic yet functional interface. The application is compatible with several audio profiles and you can choose the desired mode from the dedicated menu.
1-st order Butterworth low-pass will also allow you to add new channels manually and you can choose the input as well (left or right).
.
- Publisher: 7AMP Around Music Portal
- Date:
- Platform: WinOther
- ElectricalFilters2
- License: Freeware

Calculates poles,zeros,polynomial coefficients for:
1) Butterworth (Low-Pass, High-Pass)
2) Chebyshev (Low-Pass, High-Pass)
3) Inverse-Chebyshev (Low-Pass)
4) Cauer-Elliptical (Low-Pass)
5) Bessel-Thomson (Low-Pass)
6) Langrange (Low-Pass)
Plots Magnitude, Phase and Delay responses.
Note: Paid version additional calculates :
1) LowPass, HighPass, BandPass and BandStop Filters for all filter families.
2) Active circuit topology for each section.
3) Step/Impulse responses.
*** The developer takes no responsibility for errors arising from the use of this application.
- Publisher: ElYogiApps
- Date: 07-11-2014
- Size: 2048 KB
- Platform: Android 4.x
- Mercury StraightThru
- License: Freeware

Mercury Securities is a stockbroking in Butterworth, Malaysia, with branch offices in Kuala Lumpur, Melaka, Penang Island (Lebuh Pantai and Bayan Baru), Johor Bahru and Sarikei. We offer full stockbroking services as follows:
- Margin Financing
- Nominees and Custodian Services
- Stock Broking Retail and Institution (Malaysian and foreign stocks)
- Company Research
- IPO Underwriting
- ESOS Financing (through related company)
- Corporate Advisory Services
Mercury Securities places high emphasis in providing quality and efficient stockbroking and related services to its customers.
- Publisher: MercuryStraightThru
- Date: 12-08-2014
- Size: 623 KB
- Platform: Android 2.x, Android 3.x, Android 4.4, Android 4.x
- 6713 DSK based Karaoke Machine
- License: Freeware

Important Note: This model could only be compatible with MATLAB 7(R14) and CCS 2.21. It might work for other versions of MATLAB & CCS but for that Sampling Rates & data types of various simulink blocks might have to be adjusted (changed) to obtain optimum performance & best Result This model can be simply downloaded by clicking on Incremental Build if the hardware is connected properly and all the necessary drivers & softwares are installed. WORKING of KARAOKEMACHINE: This 6713DSK based hardware model is divided into 8 different channels. The functions of all these eight stages are explained as follows.
- Publisher: AKASH VYAS
- Date: 21-04-2013
- Size: 113 KB
- Platform: Matlab, Scripts
- Baseband numeric transmission
- License: Freeware

This script is intended to illustrate the concepts of eyediagramm, constellation, ISI and to understand the effects of additive noise power, channel frequency band restriction, number of possible states within a symbol period, affecting the quality of the transmission. Three methods are employed for low-pass filtering: - classical low pass filter (actually two order Butterworth) creating ISI. - raised cosine filter in order to illustrate the possibility of suppress ISI . - Pseudo filtering by increasing risetime and falltime of ideal rawcode . Levels of signal transmitted as well as noise level are variables, allowing thus the possibility to show the effects of the number of states by symbole time on the possibility to recover without error the information in a given Signal/Noise environment.
- Publisher: Alain Demange
- Date: 06-03-2013
- Size: 51 KB
- Platform: Matlab, Scripts
- EC1302 DSP Lab
- License: Freeware

The zipped file contains 18 m files implementing all experiments in the course EC1302 DSP Lab under Anna University Chennai, India syllabus: butterworth lowpass filter design using bilinear transformation & impulse invariant methods given relative or absolute specifications, DIT-FFT & DIF-FFT algorithms, FIR filter design using window method, sectioned or fast convolution methods (overlap-add & -save), forming a square matrix by circular-shifting of a vector (used in matrix method of convolution). Please feel free to mail me in case of any further clarification or assistance in using matlab for signal processing or in any engineering field: vsalaiselvam@yahoo.
- Publisher: Salai Selvam V
- Date: 25-01-2013
- Size: 10 KB
- Platform: Matlab, Scripts
- Comprehensive DSP Toolbox
- License: Freeware

Functions are described briefly below: 1) er_add: Add given tranfer functions. 2) er_blaschke: Perform desired frequency transformation of digital filter using Blaschke products. 3) er_conv: Multiply transfer functions. 4) er_fconv: Convolve transfer functions in frequency domain. 5) er_firlsinv: Find FIR least squares inverse and error. 6) er_fsample: Designs digital filter using frequency sampling approach with optional smoothing. 7) er_fwindow: Designs digital filter using rectangular or raised cosine window. 8) er_iirlsinv_fir: Find IIR least squares inverse and error. 9) er_lpf: Designs prototype Butterworth LPF of given order.
- Publisher: Evan Ruzanski
- Date: 12-05-2013
- Size: 20 KB
- Platform: Matlab, Scripts
- dlagf01
- License: Freeware

Conversions of these routines into Matlab.From:http://pubs.usgs.gov/of/1995/ofr-95-0077/o...77.htmlAnderson, W.L, 1983, Fourier cosine and sine transforms using lagged convolutions in double-precision (Subprograms DLAGFO/DLAGF1): U.S. Geological Survey Open-File Report 83-320, 38 p. 026 DLAGF0/ DLAGF1 Fourier cosine/sine transforms (in double-precision). Numerical integration by lagged convolution. USGS Open-File Report 83-320 (1983) Fortran-77:VAX-11/780 (VMS) Subroutine Package From the help: C THE PURPOSE OF SUBPROGRAM DLAGF0 IS TO PROVIDE IN DOUBLE PRECISION C A GENERAL ALGORITHM FOR FAST FOURIER COSINE TRANSFORMS OF THE FORM: C INTEGRAL FROM 0 TO INFINITY OF FUN(G)*DCOS(B*G)*DG, WHERE WE LAG B C IN[BMIN,BMAX]--USING IMPLIED VALUE OF BMIN=BMAX*DEXP(-.
- Publisher: Ben Barrowes
- Date: 14-06-2013
- Size: 51 KB
- Platform: Matlab, Scripts
- 6-th order Butterworth high-pass
- License: Shareware

Effective audio high pass filter.
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- Publisher: 7AMP Around Music Portal
- Date:
- Size: 1024 KB
- Platform: Win2000, Win7 x32, WinOther, WinVista
- 6-th order Butterworth low-pass
- License: Shareware

Effective audio low pass filter.
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- Publisher: 7AMP Around Music Portal
- Date:
- Size: 1024 KB
- Platform: Win2000, Win7 x32, WinOther, WinVista
- 3-rd order Butterworth high-pass
- License: Shareware

Good simple high-pass filter with one knob.
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- Publisher: 7AMP Around Music Portal
- Date:
- Size: 1024 KB
- Platform: Win2000, Win7 x32, WinOther, WinVista
Butterworth: Freeware | All










