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spoken of here is 60 Hz which is calibrated with the specifications of the AC power supplied by electric power plants--also federally regulated to be exactly 60 Hz. It's upon that 60Hz calibration that other frequencies used in the broadcast depended on. Also true in radio broadcasting especially when going on emergency power during a power outage. If that 60Hz frequency reference was off, all the others would be as well.
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The reference needed for mentions of "sine wave tone" exists in
Knowledge under Audio, but it doesn't mention "sine wave tone" in particular as part of the test conducted with the test pattern, and that page needs an edit to add that information. ALL analog audio is sine wave; this particular tone
680:
The references on this page seem to be in really bad shape, using bare URLs along with strangely-formatted citations that use descriptive passages alongside or in place of actual quotations. I will attempt to fix some of these, but would appreciate some help from a more experienced editor.
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569:Visual arts
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333:Start‑class
177:Start‑class
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711:DSLevesque
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329:Television
234:Television
173:Test cards
168:Television
116:New Jersey
111:discussion
103:New Jersey
59:New Jersey
30:Stub-class
684:pwnzor.ak
719:contribs
707:unsigned
607:Archives
454:on the
275:on the
143:on the
406:Alerts
36:scale.
698:=====
613:Index
432:Start
253:Start
715:talk
689:talk
652:2019
647:2018
642:2016
637:2012
446:Low
267:Mid
135:Low
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717:•
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42::
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