In this section you will find links to the videos we have published. The focus is on acoustic measurement technology, from room acoustics, building acoustics, and psychoacoustics to sound level measurements and, in particular, tutorials for our Akulap software.
On our website you will find a wealth of information to read up on, and the videos complement many topics.
You can find our YouTube channel here: https://www.youtube.com/@Dr-Jordan-Design
Akulap mobile series
New tutorials for our new acoustic measurement app will be available here soon.
The Visual Audio Science Series
For many years, we have compiled a wealth of information on acoustic measurement technology on our website. This series translates complex mathematical principles and DSP algorithms into highly accurate, data-driven visualizations.
| Category | Title & Description | Link |
|---|---|---|
| Fundamentals & Signal Processing | Nyquist-Shannon Sampling Theorem: Fundamentals of digital audio and signal discretization. | Watch Video |
| Fast Fourier Transform (FFT): Signal processing fundamentals and practical applications in acoustic analysis. | Watch Video | |
| Digital Signal Reproduction: Bandwidth limits, square waves, and the Gibbs phenomenon (ringing) in DACs. | Watch Video | |
| Measurement & Audio Technology | A/C Weighting: Visualizing frequency weighting curves and their impact on acoustic metrology. | Read Article |
| Time Domain Weighting: Understanding the 'Fast' and 'Slow' integration times in sound level meters. | Watch Video | |
| Acoustic Measurement Metrics: How to capture and interpret essential sound metrics including LEQ, LAFMax, LCPeak, RTA, FFT, and Spectrograms. | Watch Video | |
| Total Harmonic Distortion (THD): A practical listening test evaluating non-linear distortions down to 0.1%. While we can measure down to 0.0001% using our Audio Precision APx555. | Watch Video | |
| Wow & Flutter: Understanding and measuring speed fluctuations in analog playback systems (e.g., turntables). | Watch Video | |
| Building Acoustics | Airborne Sound Insulation: Measurement procedures and signal analysis according to ISO 16283 & ISO 717-1. | Watch Video |
| Room Acoustics | Reverberation Time (RT60): Advantages of the Chirp / Log-Sine method for measuring large room acoustics with compact sound sources. | Watch Video |
| Room Impulse Response (RIR): Background, applications, and measurement techniques for understanding room acoustics. | Watch Video | |
| Digital Room Correction (Room-EQ): Understanding the pitfalls and challenges of automated room acoustics correction. | Watch Video | |
| The Lombard Effect (Part 1): Psychoacoustics and human speech adaptation in noisy environments. Motivation. | Watch Video | |
| Simulation | Room Acoustics Simulation: Explaining the differences and applications of Sabine, Raytracing, and FEM. | Watch Video |
| The Lombard Effect (Part 2): 3D Simulation. Watch and listen what happens, if 10 tables are trying to keep a conversation. We correctly simulate the sound propagation and the vicious loop. | Watch Video |
STI STIPA DIN60268-16 series Speech intelligibility
- STIPA ED5 test signal
- Part 1: Motivation, without going into the technology; that comes in Part 2. Here I explain why STI is a very powerful tool for optimizing room acoustics.
- Part 2: Fundamentals of STIPA measurement. What influences speech intelligibility?
This series will continue. Devices, practical measurements, the indirect method, etc.
Room Acoustics Series
Tutorials for Akulap
- Measuring sound levels with Akulap
- Measurement of reverberation time using the Chirp method
- Calibration of Akulap with a sound level calibrator
- Analysis of audio recordings with Akulap, here from an NTI XL2. Akulap can load the calibration information from the NTI XL2.
- Spectral analysis of .wav files
- Evaluation of loudness in sones for time-varying signals according to DIN45631/A1 and ISO532-B
Measuring microphones
- Ultra-low noise: Comparison of different measurement microphones, from low-cost to high-end.
- Rode NT1 as an extremely low-noise measurement microphone?
- Measuring sound when it gets really loud >130dB
Measurements with our Audio Precision APX555 , the worldwide reference
Check out our channel for measurements and tutorials.
You can find more topics directly on our channel.
You can find our YouTube channel here: https://www.youtube.com/@Dr-Jordan-Design
