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Category Archives: Digital Audio
Time resolution in digital audio
I’ve been involved in several discussions on timing resolution in digital audio, recently—honestly, I never knew it was a concern before. For example, in a video on MQA, the host explained that standard audio sample rates (44.1 and 48 kHz) … Continue reading
Posted in Digital Audio
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Amplitude Modulation Principles and Interactive Widget video
This video demonstrates important uses of AM—and serves as a demonstration of using the AM widget.
Posted in Amplitude Modulation, Digital Audio, Video
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Further thoughts on wave table oscillators
I see regular questions about wave table oscillators in various forums. While the process is straight forward, I sympathize that it’s not so simple to figure out what’s important if you really want to understand how it works. For instance, … Continue reading
Posted in Digital Audio, Oscillators, Wavetable Oscillators
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WaveUtils updated
WaveUtils needed only a minor change for compatibility with the WaveTableOsc update—addWaveTable changes to AddWaveTable. But I added something new while I was at it. The original wave table articles advocated minimizing the number of tables necessary—one per octave—by allowing … Continue reading
Posted in Source Code, Wavetable Oscillators
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WaveTableOsc optimized
The wave table oscillator developed here in 2012 is pretty lightweight, but I never took a close look at optimization at the time. An efficient design is the number one optimization, and it already had that. I was curious how … Continue reading
Posted in Source Code, Wavetable Oscillators
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Wavetable signal to noise ratio
In our wavetable series, we discussed what size our wavetables needed to be in order to give us an appropriate number of harmonics. But since we interpolated between adjacent table entries, the table size also dictates the signal to noise … Continue reading
Posted in Digital Audio, Oscillators, Wavetable Oscillators
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Sampling theory, the best explanation you’ve ever heard—End notes
A few words before moving on to other topics… We’ve looked at why digital sample represent ideal impulses, and why any point between samples represents a value of zero. And, as a result, audio samples don’t represent the audio itself, … Continue reading
Sampling theory, the best explanation you’ve ever heard—Part 3
We look at what Pulse Amplitude Modulation added to our analog source audio. What did PAM add? Earlier, we noted that the PAM signal represents the the source signal plus some additional high frequency content that we need to remove … Continue reading
Sampling theory, the best explanation you’ve ever heard—Part 2
In this article, we explore the origins of sampling. Discrete time For many, discrete time and digital sampling are synonymous, because most people have little experience with discrete time analog. But perhaps you’ve used an old-style analog delay stompbox, with … Continue reading
Sampling theory, the best explanation you’ve ever heard—Part 1
I’ll start by giving away secrets first: Individual digital samples are impulses. Not bandlimited impulses, ideal ones. We know what lies between samples—virtual zero samples. Audio samples don’t represent the source audio. They represent a modulated version of the audio. … Continue reading