PACC-T: Parallel Acoustic Confound Corpus, Telecoms

5,992 bona fide speech clips (VCTK and AMI) passed through 34 speech and audio codecs, 12 tandem codec chains and 5 resample-only controls. Every condition holds the same clips, and every clip has a per-clip record of the exact commands that produced it. No synthetic or spoofed speech. See README.md in this record before measuring: sample rate and bandwidth are confounds, and the resample controls are there to separate them from codec effects.