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11th December 2017, 17:47 | #1 | Link |
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DTS audio patents expiration date?
https://dts.com/patents-bd-dvd-players/
On this link there is "DTS Digital Surround" and "2.0 + Digital Out". "DTS Digital Surround" patents: European patent 0864146: http://www.google.com/patents/EP0864146 - expired? U.S patent 5,956,674: https://www.google.co.uk/patents/US5956674 - expired? U.S patent 5,974,380: https://www.google.co.uk/patents/US5974380 - expired? U.S patent 5,978,762: https://www.google.co.uk/patents/US5978762 - expired? U.S patent 6,487,535: https://www.google.co.uk/patents/US6487535 - expired? "2.0 + Digital Out" patents: European patent 0864146: http://www.google.com/patents/EP0864146 - expired? European patent 1741093: http://www.google.com/patents/EP1741093 - anticipated expiration: 2025-03-21 U.S patent 5,956,674: https://www.google.co.uk/patents/US5956674 - expired? U.S patent 5,974,380: https://www.google.co.uk/patents/US5974380 - expired? U.S patent 5,978,762: https://www.google.co.uk/patents/US5978762 - expired? U.S patent 6,487,535: https://www.google.co.uk/patents/US6487535 - expired? U.S patent 7,333,929: https://www.google.co.uk/patents/US7333929 - expired? U.S patent 7,548,853: https://www.google.co.uk/patents/US7548853 - adjusted expiration: 2027-02-06 6 February 2027 is the date that the last u.s patent expires and march 21st 2025 for the last european patents for the 2.0 + digital out patents. The surround sound patents seemed to have expired in 2019. If a software dvd player for computers wanted to playback movie dvds that contain a DTS audio track, would it need any of the patents in the "2.0 and digital out" patents list? Last edited by hajj_3; 13th November 2023 at 16:16. |
12th December 2017, 12:21 | #2 | Link | |
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Yet one has to be very careful (I sense a dark force raising here ), as usually the whole thing is more likely a whole package, patents, designs, copyrights and stuff, all nicely packaged and put in the hands of the respective companies. In the US there are cases of reissued patents. And most of the patents are actually slight improvements, still covering the old "inventions", which are still "dangerous" for the public to touch. That's why a patent attorney is paid so much, to use any trick possible to get more coverage and duration for his client.
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15th April 2019, 09:48 | #5 | Link |
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But are probably wrapped into the DTS-X patents.
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15th April 2019, 12:15 | #7 | Link | |
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We will start seeing Dolby AC-4 added to tv's soon though as it offers great compression and features and only costs $1.20 to license in small volume and $0.15 for huge volume. It is also free if you are paying for a Dolby Digital Plus licence so i suspect that Dolby Digital Plus and Dolby AC-4 will become standard on all new tv's within the next couple of years. Last edited by hajj_3; 15th April 2019 at 12:19. |
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15th April 2019, 15:59 | #8 | Link |
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It's the same with Panasonic TV's too (from 2017 on-wards)...
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27th November 2023, 20:31 | #10 | Link | |
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PS: I hate DTS. It exists solely for the benefit of people who think they need 7.1 discrete channels (when 5.1 discrete channels with matrix-encoded additional channels is fine) and for people who think a higher bitrate axiomatically means better quality (ignoring the inefficiency of ADPCM compared to MDCT), but it's used just widely enough to be a necessity. Last edited by kurkosdr; 27th November 2023 at 20:36. |
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27th November 2023, 20:41 | #11 | Link | |
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Exactly how I feel about DTS. I couldn't have put it better! |
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27th November 2023, 20:50 | #13 | Link |
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Eh? Lossy DTS offers the same number of channels as lossy Dolby Digital. No more!
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27th November 2023, 20:52 | #14 | Link |
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Eh? So has Dolby in the form of Dolby TrueHD and Atmos!
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27th November 2023, 21:15 | #15 | Link |
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The problem with Dolby TrueHD is that it requires an AC3 "companion stream" because Dolby TrueHD is not an extension of AC3 but an entirely new format. This results in more complex audio options in the Blu-Ray menus. Instead, DTS-HD MA is a backwards-compatible extension of DTS (and all Blu-Ray players are required to support DTS) so there is no choice of stream to be made (not for the same language anyway). DTS-HD MA is still used on Blu-Rays that don't have Atmos precisely because it can satisfy the lossless audio marketing gimmick with only one stream per language.
And yes, it's a marketing gimmick because most Blu-Rays have watermarking in their audio streams anyway (which changes the audio more than lossy compression ever would). Last edited by kurkosdr; 27th November 2023 at 22:40. |
27th November 2023, 22:25 | #16 | Link | |
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DTS-ES 7.1 Discrete is also possible by using the same principles to add side-surround channels, but not sure it made it into DVD-Video or any home formats. Anyway, back on topic, none of this is required to decode DTS for basic 2.0 or 5.1 playback, implementing the first DTS spec allows you to play back all DTS technologies except DTS:X (which is an Atmos competitor). That's why I find the non-support by MxPlayer perplexing. Last edited by kurkosdr; 27th November 2023 at 22:46. |
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27th November 2023, 22:42 | #17 | Link | ||
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This is a pretty ridiculous discussion....
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27th November 2023, 22:59 | #18 | Link | ||
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EDIT: Now I remember, got confused with DTS-HR 7.1 (aka DTS-HD HR). So, lossy DTS 7.1 discrete exists but under the DTS-HR extension not the DTS-ES extension. Sorry. Anyway, all this is playable as 2.0 and 5.1 by implementing the first DTS spec. Since all the patents have expired, it's an opportunity going to waste that nobody implements it. Last edited by kurkosdr; 28th November 2023 at 00:34. |
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