Technicolor DTMF sequences: Difference between revisions

Many SP-mode videotapes duplicated at [[Technicolor VideocassetteVideo beginningServices]] in theLivonia lateusing '80seither andindustrial endingduplicators or Otari TMD systems, beginning in the1989 midand '00sending in 2006, included a sequence of DTMF tones at the start and/or end of the tape. On certain tapes with this sequence, a faint sound of extra tones precedes it. It is not yet known exactly what each tone in the sequence indicates, except there's usually a pause between the first and second tones, the second tone is always 1, the third tone is always #, and the fourth tone is always D. This sequence was used to encode informationaudio and video on the master recordingtape by providing information on settings such as format, running time, audio level balance, volume control, etc. to automatic video tapethe duplication machines. This, allowedallowing better replication. ofOn most tapes, the mastertones recordings.are Onaudible certainon pressingsthe ofleft CBS/Foxchannel releasesof fromthe earlyhi-latefi 1989,audio thistrack. sequenceHowever, occurson duringsome tapes, the still-imagedtones 1984-1999are Foxaudible FBIeither warningon screen/1984-2000the CBS/Foxright Videochannel logoof combothe thathi-fi likelytrack or occuredexclusively on thosethe pressingslinear dueaudio totrack. someDisney sortvideotapes ofare the most notable tapes to use processingthese errorsequences.