Richard G. Lyons, Understanding Digital Signal Processing [0]
Gareth Loy, Musimathics: The Mathematical Foundations of Music (volume 2) [1]
r8brain-free-src (high quality sample rate conversion algorithms) [2]
KVR's DSP forum, frequented by actual pro audio developers [3]
[0] https://www.amazon.com/Understanding-Digital-Signal-Processi...
[1] https://www.amazon.com/gp/product/026251656X/ref=pd_cp_0_1?i...
https://www.amazon.com/Understanding-Digital-Signal-Processi...