Audio Internals

The Ultimate Audio Engineering Resource for Professionals

A decade of hands-on experience with audio engineering, music technology, and digital signal processing, distilled into one book!

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Audio Engineering

Explore audio engineering concepts with interactive examples. Escape the world of theory and put your knowledge into practice.

Microphone Internals

Speaker Internals

Polar Patterns

Comb Filtering

Compression Formats

Module 1

Cardioid
Figure 8
Omnidirectional
Code

The cardioid polar pattern using one pressure-sensitive and one pressure-gradient microphone.

The code used to produce the examples.

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Music Technology

Implement algorithms to perfect your music. Discover and use the best open source tools for music manipulation.

Music Streaming Optimizations

Automatic Music Transcription

Harmonic-Percussive Separation

12 Equal Temperament

Chromagrams

Module 2

Envelopes are used to control the attenuation of a sound. The Attack Delay Sustain Release (ADSR) is the most commonly used envelope in MIDI editing software.

Attack: 0.50 s

Decay: 0.50 s

Sustain: 0.70

Release: 0.50 s

Digital Signal Processing

Learn digital signal processing with real audio examples. No calculus or advanced math required.

Discrete Fourier Transform

Fast Fourier Transform

Spectrogram Generation

Time Stretching and Pitch Shifting

Constant-Q Transform

Module 3

Image
Code

An impulse in the frequency domain corresponds to a uniform distribution in the time domain (e.g. a constant tone). An impulse in the time domain corresponds to a uniform distribution in the frequency domain (e.g. a drum hit).

The code used to generate the image.

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About the Authors

Written by world-class professionals.

Craig Carr

Craig is a skilled and innovative software engineer with a passion for revolutionizing the world of audio technology. Throughout his career, he has had the privilege of working on multiple groundbreaking audio applications, with a focus on machine learning research.

Craig has developed multiple apps for Apple's App Store, including ConvoCap (speech-to-text) and PollySpeak (text-to-speech). These apps aim to improve accessibility for the older and younger generations, respectively.

Adam Kosminsky

Adam is a master of the science behind audio. As a visionary thinker and expert practitioner, he has consistently defied convention, instead opting to forge new paths that disrupt traditional norms.

At Soundscaper, Adam pioneered large-scale active noise cancellation technology. Many enterprises and scientific laboratories have benefitted from the ability to control environments more precisely.

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