Asking the right questions

Zaphod’s Blog.

“I would rather have questions that can't be answered than answers that can't be questioned.”
— Richard Feynman

Digital audio · 11 minute read

Is it possible to achieve perfect upsampling?

What reconstruction accuracy and listening tests tell us about PGGB’s new Precision Optimized Upsampling Engine.

September 13, 2026

Digital audio · 8 minute read

Where timing information goes, what rounding changes, and why a few extra bits of precision help.

September 11, 2026

Deep dive · 11 minute read

Algorithms, precision and noise shaping, with measured comparisons against reference filters.

January 18, 2025

Deep dive · 15 minute read

A closer look at sampling theory, ringing, transient timing and the tests used to evaluate upsampling.

April 24, 2024