What needs to be clarified
Characterise timing and frequency differences, test consistency across the recording and distinguish speed change from local omissions or independent tempo processing.
Materials to prepare
- Both audio versions as received without resaving
- Export software details and player speed settings
- Corresponding utterance list and retained processing log
What to compare
Compare matching utterance durations, event intervals and frequency features at several locations. Check declared sample rate, sample count and playback at neutral speed. Distinguish proportional time changes, pitch-preserving processing and local gaps; document each test on working copies, retaining unchanged sources.
Possible outcome of the analysis
A timing correspondence table and technical processing assessment may result; the cause may remain uncertain, while suitability for transcription is assessed separately.
Limits of the conclusions
A similar speed change does not identify the processing software or intent. Transformed voice pitch alone cannot establish speaker identity or completeness of the conversation.