Understand Sound—and See How Products Process It
The 14 articles are divided into basic acoustics and engineering practice. Alongside voice concepts, they publicly document compatibility errors, anomalous inputs, real-time audio issues, privacy trade-offs, and fixes encountered across the CVoice family.
From Real Development and Troubleshooting
These are not summaries assembled from popular keywords; they preserve the observed problem, failed hypotheses, solution path, and scope of applicability in full.
How file extensions, MIME, containers, and codecs can create compatibility breakpoints before upload even begins.
Anomalous Audio · Product BoundariesA Whistle Has Pitch—So Why Can’t It Be Analyzed as Speech?Why looking only at fundamental frequency can produce a perfectly formatted yet meaningless voice report.
FrostNote · Real-Time DetectionWhy Real-Time Pitch JumpsHow short-time windows, confidence, dropout tolerance, and stable display each play a different role.
Pitch Training · Calculation GuideWhy Pitch Error Uses Cents Instead of HertzFrom frequency ratios and calculation examples to the real meaning of a ±25-cent practice zone.
Privacy Architecture · Four-Product ComparisonKeep Audio Local or Upload It to a Server?Compare the different choices made by CVoice, Insight, FrostNote, and MelodyCanvas.
MelodyCanvas · Sound CreationHow a Drawn Line Becomes a MelodyHow to handle continuous lines, sample transposition, audio clocks, and performance in dense compositions.
Stage · Real-Time AudioConnected, but No Singing AudioHow to verify a path from successful negotiation all the way to actual audible sound, while keeping a fallback channel.
Test Method · Directly ReproducibleA Reproducible Four-Round Voice Test ProtocolValidate same-file computation, re-recording, single-variable changes, and cross-version changes separately.
Start with the Sound Itself
Separate pitch, resonance, and spectrum first, then discuss “what it sounds like.”
Why F0 is not timbre, why harmonics cause octave errors, and how cents express pitch deviation.
Basic Acoustics · About 9 minFormants, Spectrum, and Where “Brightness” and “Weight” Come FromUse the source–filter model to understand why the same pitch can have completely different timbres.
Understand Why Measurements Change
Distance, angle, room acoustics, device processing, encoding, and expressive state all feed into the result.
Result Interpretation · About 7 minWhy the Same Person Gets Different Results TwiceDistinguish same-file stability, natural variation from re-recording, and version changes.
Technical Choices & Responsibility in Interpretation
From microphone permissions, audio graphs, and FFT to the trade-offs between local and server-side processing.
Method Boundaries · About 9 minMeasurement, Impression, and Identity: Three Levels of Conclusions That Must Not Be MixedWhy voice can provide clues but cannot prove sex, age, personality, or health status.