Notes concerning “Digital signal processing (DSP)”

• Square wave synthesis 2014-02-24 (2 minutes)
• Compression with second-order diffs 2014-04-24 (3 minutes)
• Precisely how is 3 “optimal” for one-hot state machines, sparse FIR kernels, etc.? 2014-04-24 (8 minutes)
• Polynomial-spline FIR kernels by integrating sparse kernels 2014-04-24 (12 minutes)
• Randomizing delta-sigma conversion to eliminate aliasing 2014-04-24 (7 minutes)
• Some speculative thoughts on DSP algorithms 2014-04-24 (20 minutes)
• Ideas to ship in 2014 2014-04-24 (updated 2019-05-05) (35 minutes)
• Entry-C: a Simula-like backwards-compatible object-oriented C 2015-04-05 (updated 2017-04-03) (24 minutes)
• Rhythm codes 2015-09-03 (4 minutes)
• Very fast FIR filtering with time-domain zero stuffing and splines 2015-09-03 (updated 2015-09-07) (13 minutes)
• Bitstream dsp 2015-09-03 (updated 2019-06-23) (3 minutes)
• Convolution applications 2015-09-07 (updated 2019-08-14) (9 minutes)
• Hash feature detection 2015-09-17 (5 minutes)
• Piano synthesis 2015-09-17 (updated 2017-07-19) (6 minutes)
• Gaussian spline reconstruction 2016-06-05 (updated 2016-06-06) (5 minutes)
• Chintzy depth of field 2016-10-27 (1 minute)
• One-line thoughts that don’t merit separate notes 2017-01-04 (updated 2017-02-25) (4 minutes)
• The Magic Kazoo: a synthesizer you stick in your mouth 2017-04-04 (updated 2019-05-12) (6 minutes)
• Karplus–Strong PLLs 2017-06-09 (1 minute)
• Can you make a vocoder simpler using CIC filters? 2017-06-28 (updated 2018-06-17) (2 minutes)
• Cheap frequency detection 2017-06-29 (updated 2019-06-19) (50 minutes)
• Another candidate lightweight frequency tracking algorithm 2017-08-18 (4 minutes)
• Cassette tape capacity 2018-04-27 (1 minute)
• Framed-belt DSP 2018-04-27 (3 minutes)
• How can we do online pitch detection? 2018-04-27 (updated 2018-04-30) (6 minutes)
• Ideas to pursue 2018-05-05 (updated 2018-08-16) (6 minutes)
• Accelerating convolution and correlation with short periodic waveforms using OLAP marginal prefix sums 2018-06-05 (4 minutes)
• Whistle detection 2018-06-06 (updated 2018-12-02) (18 minutes)
• Word stream architecture 2018-06-17 (13 minutes)
• Is a phase vocoder or a bunch of PLLs a more efficient way to listen to all FM radio stations at once? 2018-06-17 (updated 2019-07-29) (7 minutes)
• Quintic upsampling of time-series with 1½ multiplies per sample 2018-10-28 (2 minutes)
• Recurrent comb cascade 2018-11-09 (updated 2018-11-10) (2 minutes)
• Sparse filters 2018-12-02 (4 minutes)
• The Bleep ultrasonic modem for local data communication 2018-12-10 (updated 2018-12-11) (8 minutes)
• Evaluating DSP operations in minimal buffer space by pipelining 2018-12-18 (updated 2018-12-19) (20 minutes)
• Sample reversal 2018-12-18 (updated 2019-01-17) (5 minutes)
• Real-time bokeh algorithms, and other convolution tricks 2018-12-18 (updated 2019-08-15) (23 minutes)
• Median filtering 2019-01-17 (11 minutes)
• Honk development 2019-03-21 (2 minutes)
• Free space optical coding gain 2019-05-08 (updated 2019-05-09) (4 minutes)
• Smooth hysteresis 2019-06-11 (13 minutes)
• Observable transaction possibilities 2019-06-15 (10 minutes)
• Using the Goertzel algorithm, the Minsky algorithm, PLLs, and prefix sums for frequency detection 2019-06-16 (updated 2019-07-05) (39 minutes)
• Phase relations 2019-07-23 (updated 2019-07-24) (4 minutes)
• The miraculous low-rank SVD approximate convolution algorithm 2019-08-14 (updated 2019-08-15) (31 minutes)
• Image filtering with an approximate Gabor wavelet or Morlet wavelet using a cascade of sparse convolution kernels 2019-08-31 (updated 2019-09-08) (28 minutes)
• Processing halftoning 2019-09-01 (15 minutes)
• A bag of candidate techniques for sparse filter design 2019-09-01 (18 minutes)
• Debokehfication 2019-09-01 (updated 2019-09-12) (4 minutes)
• Dercuano plotting 2019-09-03 (updated 2019-09-05) (34 minutes)
• Isotropic nonlinear texture effects for letterforms from a scale-space representation 2019-09-10 (16 minutes)
• Nonlinear bounded leaky integrator 2019-09-11 (8 minutes)
• Sparse sinc 2019-09-15 (10 minutes)
• Audio tablet 2019-09-28 (7 minutes)
• Comb filtering PWM 2019-10-28 (4 minutes)
• Sparse filter optimization 2019-11-01 (5 minutes)
• Camera flash extrapolation 2019-11-12 (6 minutes)
• Applying FM synthesis to natural sounds such as voices 2019-11-12 (2 minutes)
• Transmitting low-power TV signals around your house via RF modulation with an SDR 2019-12-01 (6 minutes)
• Magic sinewave filter 2019-12-17 (6 minutes)