-
Recent Posts
Archives
- April 2019
- September 2018
- August 2017
- May 2017
- January 2017
- December 2016
- September 2016
- February 2016
- September 2015
- January 2015
- March 2014
- January 2014
- October 2013
- June 2013
- May 2013
- April 2013
- March 2013
- February 2013
- December 2012
- November 2012
- May 2012
- March 2012
- January 2011
- December 2010
- November 2010
- July 2007
- March 2003
- February 2003
- August 2002
- January 1997
- November 1996
- October 1996
- August 1996
- July 1996
Categories
- Digital Audio (58)
- Aliasing (9)
- Convolution (3)
- Dither (7)
- Filters (23)
- DC Blocker (1)
- FIR Filters (7)
- IIR Filters (17)
- Biquads (11)
- Fourier (3)
- FFT (3)
- Impulse Response (5)
- Jitter (2)
- Oscillators (11)
- Phase (2)
- Reverb (2)
- Sample Rate Conversion (10)
- Sampling Theory (6)
- Effects (1)
- Envelope Generators (5)
- Math (2)
- MIDI (2)
- Source Code (10)
- Synthesizers (9)
- Uncategorized (4)
- Video (4)
- Widgets (12)
- Digital Audio (58)
Category Archives: Digital Audio
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
3 Comments
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
Leave a comment
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
Leave a comment
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
Sampling theory, the best explanation you’ve ever heard—Prologue
I’ve been working on a new video, with the goal of giving the best explanation of digital sampling you’ve ever heard. The catch is I started on it three years ago. I’m not that slow, it’s just that I’ve been … Continue reading
Amp simulation oversampling
In tandem with our last article on Guitar amp simulation, this article gives a step by step view of the sampling and rate conversion processes, with a look at the frequency spectrum. From guitar to digital The first two charts embody the … Continue reading
Guitar amp simulation
In this article, I’ll sketch a basic guitar amp simulator. For one, questions on the topic come up often, and also, it will be a good example of a typical use of working at a higher sample rate. The most … Continue reading
Posted in Aliasing, Digital Audio, Sample Rate Conversion
3 Comments