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About the Windows Media Codecs - Win32 apps | …
https://docs.microsoft.com/en-us/windows/win32/medfound/about-the-windows-media-codecs
Codec Feature Player backward compatibility; Windows Media Audio 9: Constant-bit rate (CBR) encoding: Windows Media Player 6.4 or later on non-portable devices (using transcoding as needed) Windows Media Player 9 for Mac OS X Windows Media Player 9 Series and Windows Media Player 9.1 for Pocket PC*
Using Noise Substitution for Backwards-Compatible Audio ...
https://colinraffel.com/publications/aes2010using.pdf
nately, most audio codecs leave little room for backwards-compatibility, and each generally requires its own specialized decoder. This paper discusses the technique of using a perceptually-shaped representation of the coding error to improve existing audio codings. The method recommended involves coding the error as per-critical-band noise levels.
On the cost of backward compatibility for communication …
https://www.researchgate.net/publication/221484012_On_the_cost_of_backward_compatibility_for_communication_codecs
Hereby, a closer look is given on the concept of extending technologies to more capabilities in contrast to non-backwards compatible solutions. Overview of the …
Using Noise Substitution for Backwards-Compatible Audio ...
https://colinraffel.com/talks/aes2010using.pdf
Implementation: “row-mp3” I The MP3 codec is highly pervasive but somewhat out-of-date I To allow backwards-compatibility, we can store information in the ID3 (metadata) tag I “row-mp3”-aware decoders can use the information, while others will simply ignore it I Including per-frame critical band levels results in a relatively small data overhead I For example, with a 23.2 ms …
ISO/IEC JTC1/SC29/WG11 N1419 November 1996
https://sound.media.mit.edu/resources/mpeg4/audio/public/w1419.pdf
listening tests on the MPEG-2 Backwards Compatible multichannel coding algorithms [1]. Eight codecs were evaluated at that time: six MPEG-2 Backwards Compatible (BC)1 implementations and two Non-Backwards Compatible (NBC) codecs. The results indicated that all of the codecs tested were not acceptable for high quality applications at the tested bitrates.
Appendix C – Dolby Atmos Delivery Codecs – Dolby ...
https://learning.dolby.com/hc/en-us/articles/4406039180564-Appendix-C-Dolby-Atmos-Delivery-Codecs-
After the spatial coding process, the OAR renders the audio to 5.1, or first to 7.1, which is then downmixed to 5.1. All of the audio from the Dolby Atmos master is present in the 5.1 downmix. This is done so that Dolby Digital Plus JOC is backwards compatible with regular channel-based 5.1 Dolby Digital Plus.
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