Audience-size scaling corrections in movie sound standards are incorrect
Evidence
Even with a seat count that ranges through 6, 24, 60, 114, 161, 211 and 516, there is no obvious pattern of change in steady-state room curves beyond the small difference in air attenuation in the direct sound. The scaling corrections based on audience size advised in SMPTE ST 202 and ISO 2969 recommendations are incorrect. If the intent was to acknowledge air attenuation as a function of propagation distance, the loss can be easily calculated for any seat in any venue, and it will be different from the straight-line variations suggested in the recommendations (see Figure 10.12). — , Toole, Floyd E - Sound reproduction-…, 1353
Categorization
- QUESTION: Worth chasing: what specific measurements across the seven venues revealed that no pattern beyond air attenuation exists?
- XREF: connects to: Cinema playback level disputes have prompted talk of legal limits; Movies reach audiences through many mismatched sound systems, breaking the calibration loop
Related
- Movies reach audiences through many mismatched sound systems, breaking the calibration loop (similarity 0.94)
- Cinema playback level disputes have prompted talk of legal limits (similarity 0.91)
- Room size does not alter steady-state curves above 400 Hz (similarity 0.79)
- Cinema’s non-neutral spectral target forces engineers to compensate and varies across venues (similarity 0.79)