When performing all tests that use subjective assessment of the video and audio, what is the minimum observation time that should be used?
As described in footnote 1 of Item 8 (RF Dynamic Range) in Technical Appendix 1 of the Final Rule, “For subjective measurement, the use of an expert viewer is recommended. The viewer shall observe the video and listen to the audio for at least 20 seconds in order to determine Threshold of Visibility (TOV) and Threshold of Audibility (TOA).” 37. For the Single Static Echo Tests (Item 15 in Technical Appendix 1 of the Final Rule), can the same evaluation method used in the evaluation of field ensembles defined in NTIA FAQ #14 be used? If not, then what evaluation method should be used? The evaluation method used to determine converter box performance with single static echoes is different from that used to determine converter box performance with the field ensembles. In the single static echo test, for each echo delay specified in Tables 4 or 5 in Technical Appendix 1, the echo signal power should be increased until the threshold of visibility (TOV) occurs. At each echo delay, the measur
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