テストトーン
1. Standard test toneIn telecommunication, a standard test tone is a single-frequency signal with a standardized level generally used for level alignment of single links and of links in tandem. For standardized test signal levels and frequencies, see MIL-STD-188-100 for United States Department of Defense (DOD) use, and the Code of Federal Regulations Title 47, part 68 for other Government agencies.
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Read “Standard test tone” on English Wikipedia
Read “テストトーン” on Japanese Wikipedia
Read “Standard test tone” on DBpedia
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