Measuring Audio when Clocks Differ

Martin M, Datta J, Zhou X. Measuring Audio when Clocks Differ. In: AES Convention 145. Audio Engineering Society; 2018. Paper 10055. Available from: https://aes.org/publications/elibrary-page/?id=19781

@inproceedings{Martin2018_19781,
  author = {Martin, Mark and Datta, Jayant and Zhou, Xinhui},
  title = {{Measuring Audio when Clocks Differ}},
  booktitle = {AES Convention 145},
  note = {Paper 10055},
  year = {2018},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=19781}
}

TY  - CPAPER
TI  - Measuring Audio when Clocks Differ
AU  - Martin, Mark
AU  - Datta, Jayant
AU  - Zhou, Xinhui
T2  - AES Convention 145
M1  - Paper 10055
PY  - 2018
DA  - 2018/10/06
UR  - https://aes.org/publications/elibrary-page/?id=19781
PB  - Audio Engineering Society
LA  - en
AB  - This paper examines what happens when a digital audio signal is measured with respect to a digital reference signal that was created based on a different clock. The resultant change in frequency and time depends on the degree of mismatch between clocks and may introduce a significant amount of distortion into the measurements. But the distortion is different from the types normally considered important in audio systems and may obscure other types of distortion, e.g., harmonic, IMD, and noise, that are more important to accurately assess. A difference in clocking essentially creates a difference in sample rates. Therefore, sample rate conversion methods can be used to mitigate the discrepancy. Although this approach is effective, it cannot be used when the sample rate difference is too small, it can be computationally intensive, and it cannot entirely eliminate the effects of a clocking difference. This paper describes a much simpler and more effective technique that requires minimal computation.
ER  -