Four-Sample Fourier Transform
Transform four equally spaced real samples into their discrete Fourier frequency components.
MathOpen tool ↗THE FEUTEX TOOLKIT
Tools for everyday tasks · Page 19
Find the right tool for your task. Search by name or file format, save favorites and pick up where you left off.
/
1444 tools
Point Inversion in a Circle
Map a planar point through a geometric inversion circle while preserving its radial direction.
GeometryOpen tool ↗Quadratic Real Root Solver
Find both real roots and the vertex of a quadratic polynomial from its coefficients.
MathOpen tool ↗Telescope Eyepiece Performance
Compare eyepiece magnification, exit pupil and approximate true field of view.
AstronomyOpen tool ↗Astrophotography Pixel Sampling
Compare angular pixel scale with seeing and estimate pixels across a target.
AstronomyOpen tool ↗Circular Orbit Profile
Calculate orbital velocity, period and specific energy around a specified body.
AstronomyOpen tool ↗Elliptic Orbit Apsides
Find eccentricity, semimajor axis and speed at the near and far points of an orbit.
AstronomyOpen tool ↗Hohmann Transfer Budget
Estimate two impulsive burns and coast time between coplanar circular orbits.
AstronomyOpen tool ↗Orbital Plane Change Burn
Estimate an ideal impulsive plane change at a selected orbital speed.
AstronomyOpen tool ↗Synodic Alignment Period
Estimate the time between repeated alignments of two bodies with constant orbital periods.
AstronomyOpen tool ↗Exoplanet Transit Depth
Estimate the fraction of stellar light blocked by a smaller opaque planet.
AstronomyOpen tool ↗Stellar Distance Modulus
Infer stellar distance from apparent and absolute magnitude with an extinction allowance.
AstronomyOpen tool ↗Combined Stellar Magnitude
Combine the apparent brightness of two unresolved stars.
AstronomyOpen tool ↗Blackbody Peak and Surface Flux
Estimate peak wavelength and emitted power per unit area for an ideal blackbody.
AstronomyOpen tool ↗Stellar Luminosity from Radius and Temperature
Estimate luminosity relative to the Sun under a spherical blackbody model.
AstronomyOpen tool ↗Spectral Line Redshift
Calculate redshift and radial velocity using both small-shift and relativistic formulas.
AstronomyOpen tool ↗Astrophotography Stack Signal-to-Noise
Estimate stacked signal-to-noise from source, background, dark current and read noise.
AstronomyOpen tool ↗Plane-Parallel Airmass Estimate
Estimate atmospheric path length relative to the zenith at moderate altitude.
AstronomyOpen tool ↗Apparent Angular Diameter
Calculate the angle subtended by a circular object of known diameter and distance.
AstronomyOpen tool ↗Telescope Obstruction and Light Collection
Estimate clear collecting area and the fractional loss from a central obstruction.
AstronomyOpen tool ↗Tidal Acceleration Difference
Estimate the leading-order radial tidal acceleration across a short object.
AstronomyOpen tool ↗Hyperfocal Focus Range
Calculate hyperfocal distance and the near sharp limit when focused at that distance.
PhotographyOpen tool ↗Thin Lens Image Position
Find image distance and signed magnification for a thin lens and real object.
PhotographyOpen tool ↗Macro Extension Exposure Compensation
Estimate magnification and exposure increase from lens extension beyond infinity focus.
PhotographyOpen tool ↗Diffraction Disk and Pixel Comparison
Compare Airy disk diameter with sensor pixel pitch.
PhotographyOpen tool ↗Manual Flash Working Distance
Estimate flash distance at an aperture, ISO and power fraction using a supplied guide number.
PhotographyOpen tool ↗ND Filter Long Exposure Planner
Calculate exposure duration after a neutral-density filter and display optical density.
PhotographyOpen tool ↗Panorama Coverage Planner
Plan image count and step angle for a chosen panorama width and overlap.
PhotographyOpen tool ↗Stereo Camera Depth Estimate
Estimate depth and first-order depth uncertainty from disparity.
PhotographyOpen tool ↗Focus Breathing Measurement
Measure framing change between focus distances using the same reference object.
PhotographyOpen tool ↗Anamorphic Desqueeze Dimensions
Calculate desqueezed dimensions and aspect ratio for anamorphic footage.
PhotographyOpen tool ↗Crossed Polarizer Transmission
Estimate ideal transmission through a second polarizer at a chosen relative angle.
PhotographyOpen tool ↗Refraction and Total Internal Reflection
Calculate the critical angle for a ray crossing from higher to lower refractive index.
PhotographyOpen tool ↗Diffraction Grating Order
Calculate the diffraction angle and highest possible order for normal incidence.
PhotographyOpen tool ↗Projection Throw Geometry
Calculate image width, height and diagonal from throw distance and lens ratio.
PhotographyOpen tool ↗Combine Two Sound Levels
Add two uncorrelated sound levels using their intensity contributions.
AudioOpen tool ↗Free-Field Sound Distance Change
Estimate level change as listening distance changes from a reference point.
AudioOpen tool ↗Speaker Delay Alignment
Align arrivals from two speaker distances using a supplied sound speed.
AudioOpen tool ↗Rectangular Room Mode Frequency
Calculate a selected three-dimensional axial, tangential or oblique room mode.
AudioOpen tool ↗Sabine Reverberation Estimate
Estimate decay time and the additional absorption needed to reach a target RT60.
AudioOpen tool ↗Helmholtz Resonator Tuning
Estimate resonator frequency from neck cross-section, effective neck length and cavity volume.
AudioOpen tool ↗Two-Path Comb Filter Notches
Predict the first cancellation and spacing caused by an equal-amplitude delayed copy.
AudioOpen tool ↗Static Compressor Transfer
Calculate steady-state output above a hard-knee compressor threshold.
AudioOpen tool ↗Ideal Quantization Noise
Estimate the ideal full-scale sine signal-to-quantization-noise ratio for a bit depth.
AudioOpen tool ↗Beat Frequency Between Tones
Estimate audible beating and cents detuning between two nearby sine tones.
AudioOpen tool ↗Acoustic Doppler Shift
Estimate observed frequency for motion directly along the source-observer line.
AudioOpen tool ↗Open and Closed Pipe Resonance
Compare the fundamental and first overtone of ideal open and one-end-closed pipes.
AudioOpen tool ↗Slow Motion Conform Planner
Calculate playback duration and speed percentage when high-frame-rate footage is conformed.
VideoOpen tool ↗No matching tools.