WIKI
Technical documentation: calculation method, assumptions, formulas, validity conditions. Standards, quantities and measurement methods, plus the documentation of the open-source repositories and web tools — those pages link back to the repo or tool they belong to.
Acoustics
-
Regulatory references: environmental and building acoustics
The Italian statutes and the ISO, IEC and UNI standards in force for environmental and building acoustics, each with its edition, scope, and what it does NOT cover.
Open the wiki → -
Vibration in buildings
Four different questions, four different standards: disturbance to people, damage to the building, worker exposure, sensitive equipment. Conflating them is the commonest mistake.
Open the wiki → -
RaySound: the room-acoustics engine
What ST-LINE's proprietary engine for enclosed-space acoustics does: per-band prediction, inverse design from a target to the surface treatment, and an upfront diagnosis of how much the available data can actually determine.
Open the wiki → -
pffdtd: wave-based FDTD for room acoustics
The ST-LINE fork of Brian Hamilton's FDTD solver: how a grid-based wave forward works, what it costs, where staircasing breaks it, and what was optimised on the CUDA engine while leaving the numerical scheme untouched.
Open the wiki → -
Room simulator (shoebox)
Clarity and reverberation in a rectangular room: exact Image Source Method, Eyring/Sabine diffuse tail, and why C50/C80/EDT/T30 describe listening quality.
Open the wiki → -
Differential immission criterion
The Italian check that noise from a specific source does not exceed the background by more than 5 dB by day and 3 dB by night, inside the affected dwelling.
Open the wiki → -
DPR 142/04 limits — road noise
Pre-screening against the Italian DPR 142/04: noise-pertinence bands, limits for new, existing and assimilated roads, sensitive receptors.
Open the wiki → -
LEX,8h — noise exposure
A worker's daily personal noise exposure level and the action and limit values of the Italian Workplace Safety Act.
Open the wiki → -
Maekawa diffraction
Why sound is still heard behind a noise barrier: geometry, Fresnel number and single-edge attenuation.
Open the wiki → -
Reverberation time
Reverberation in enclosed spaces: what it is, why it matters, how it is measured, how it is reduced and when treatment really helps.
Open the wiki → -
Sound level composition
Adding and subtracting levels in decibels: why 60 + 60 dB make 63 and not 120, and how to correct a measurement for background noise.
Open the wiki → -
acmap
Browser-based acoustic mapping: sound-level surveys and a simplified octave-band propagation model, with ISO 9613 terms and Maekawa diffraction on OSM buildings.
Open the wiki → -
noise-barrier-calc
Noise-barrier attenuation calculator: ISO 9613-2 §7.4 + Maekawa selectable, per octave band. Live tool at /en/tools/barrier-calculator/.
Open the wiki →
Electronics & embedded
-
arducam-evk-gui
Tkinter GUI for the Arducam EVK SDK, sensor data-driven.
Open the wiki → -
ADC/DAC: resolution, LSB and SNR
Quantization and LSB size, where 6.02·N+1.76 comes from, SINAD and ENOB as the real figure of merit, dynamic range and the Nyquist frequency.
Open the wiki → -
Digital IIR filters and the biquad cascade
Designing IIR filters in the five classical families (Butterworth, Chebyshev I and II, elliptic, Bessel) as a cascade of second-order sections: bilinear transform, stability from the poles, SOS coefficients and CMSIS-DSP export.
Open the wiki → -
Gerber format: history, variants and viewer
What the Gerber format is and where it comes from, its variants (RS-274D, RS-274X, X2), the Excellon drill file, how a PCB's layers compose and why many manufacturers today prefer formats like ODB++ and IPC-2581.
Open the wiki → -
PCB trace width and controlled impedance
Sizing the traces of a printed circuit board: width for current capacity (IPC-2221), resistance and voltage drop; the characteristic impedance of microstrip and stripline and why it matters for signal integrity.
Open the wiki → -
PDN and decoupling: target impedance and the capacitor network
Power distribution network, target impedance Zt = ΔV/ΔI, the role of bulk and HF capacitors, anti-resonance and how to choose values to keep the rail impedance low.
Open the wiki → -
A crystal's load capacitors
What a crystal's load capacitance CL is, why the two external capacitors are needed, how to size them from the stray capacitance, and what happens when the value is wrong.
Open the wiki → -
Analog filters and the Bode plot
1st- and 2nd-order filters — RC, RL, RLC and Sallen-Key — cutoff frequency and Q factor, how to read a Bode plot and why you move to an active topology.
Open the wiki → -
Anatomy of a USB Power Delivery PDO
How a USB-C charger declares what it can supply: the 32 bits of the Power Data Object, the field scaling, and the sink↔source negotiation that takes you from the initial 5 V to the power contract.
Open the wiki → -
Bandwidth of a MIPI CSI-2 camera interface
How to size the link between a camera sensor and a SoC: from pixel rate to data rate, D-PHY lane utilization, pixel formats and packetization overhead.
Open the wiki → -
UART baud rate error
How a UART generates the baud by dividing the clock, why an error appears, how the tolerance budget is derived (3.95% for 8N1 at 16×) and the role of the fractional divisor.
Open the wiki → -
Repo USBPD-Stack
Cross-platform distribution of the NXP USB Power Delivery stack for the PTN5110.
Open the wiki → -
x-cube-n6-camera-capture-nucleo
Exploring the STM32N6: a UVC webcam with the hardware H.264 encoder.
Open the wiki →
Scientific software
-
visualdb
Local app to build forms, sheets and reports over existing databases, no cloud.
Open the wiki → -
Data formats and endianness
How the same bytes become different numbers — big/little endianness, two's-complement integers, IEEE-754 single/double floats (sign, biased exponent, mantissa) and the practical cases of reading registers and binary frames.
Open the wiki → -
Image processing: convolution, Bayer, histogram
The fundamentals behind the Image Processing Lab tool: 2D convolution and kernels, the Bayer pattern of CMOS sensors and demosaicing, histogram, luminance and exposure.
Open the wiki → -
Measurement uncertainty per the GUM
An uncertainty budget per the GUM — type A and B uncertainty, distributions and divisors (√3 rectangular, √6 triangular), combination in quadrature, expanded uncertainty and the coverage factor.
Open the wiki → -
The FFT and analysis windows
Spectral leakage, windows (Hann, Hamming, Blackman, Blackman-Harris, flat-top) and their metrics — ENBW, scalloping, main lobe and side-lobes — how to pick the right window to analyse a spectrum.
Open the wiki →