Revision as of 06:38, 29 January 2022 edit 2601:4c4:4000:a8c0:89f0:f719:eea9:ae20 (talk) Only SP-mode VHS releases duplicated at Technicolor had the DTMF sequence at the beginning and/or end of the tape. Also they retired from adding that pattern to their tapes, around 1997 or 98. ← Older edit		Revision as of 04:15, 30 January 2022 edit undo 2600:387:2:805::b0 (talk) welp, I was wrong actually. Someone’s copy of a 2002 DreamWorks/SKG VHS has the DTMF phone dial tone sequence at the start. Also my grandma’s copy of The Wedding Singer 1998 (2000 re-print) VHS which no longer comes in a slipcover casing (they likely lost the casing or something like that) has those tones at the start of that tape. Newer edit →
Line 1: Many SP-mode videotapes duplicated at Technicolor Videocassette beginning in the late '80s and ending in the ~~late~~mid '~~90s~~00s included a sequence of DTMF tones at the start and/or end of the tape. 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.

Technicolor DTMF sequences: Difference between revisions