Dolby Digital Plusĭolby Digital Plus was introduced in 2005 and has been steadily improved. Stereo can be downmix matrix-encoded from 5.1.ĭolby audio metadata is carried along with the audio payload. It is still in wide usage globally.ĭolby Digital bitrates for 5.1 audio are minimum of 384kbps which represents an 18:1 compression ratio at near uncompressed quality.ĭolby Digital bitrates for stereo are minimum of 128kbps. Dolby Digital later became the standard for DVD and Blu-Ray, ATSC and DVB terrestrial broadcast, cable, satellite and streaming services. Dolby Consumer Codec Overview Dolby Digital (AC-3)ĭolby Digital was originally used for cinema applications with the audio encoded on the film itself. Stereo that has been matrix-encoded from 5.1 is referred to as Lt/Rt (left total/right total).
DOLBY AC3 CODEC FOR GOM PRO
These include Pro Logic II which is used to matrix 5.1 to stereo and Surround EX which is used to matrix rear surround channels into side surround channels. Matrix encoding sums channels together and uses audio phase differences to encode and recreate discrete audio channels on decode. In conjunction with Dolby audio codecs, an older technology is sometimes utilized called matrix encoding. This metadata is authored during the encode and used by consumer decoders to achieve optimal playback results for the device as well as listener preferences. The other feature and benefit of Dolby Codecs is that they carry metadata along with the compressed audio.
DOLBY AC3 CODEC FOR GOM PROFESSIONAL
In addition to audio codecs for delivering to consumers, Dolby has a professional audio codec for use in professional contribution and post production – Dolby E.
Dolby audio codecs provide near uncompressed audio quality at low datarates. Dolby codecs as a group are lossy/perceptual codecs, meaning that the codecs use patented psychoacoustic algorithms and processing to achieve bitrate reduction by removing redundant audio content that is imperceptible by the human ear. Dolby Codecsĭolby audio codecs provide substantial bitrate reductions, which allows for the delivery of audio by broadcast, streaming and fixed media at a fraction of the bandwidth and file size of uncompressed audio. Atmos is not an audio codec, but can be delivered by multiple codecs. The Atmos system renders an Atmos mix appropriate to the listener’s device and/or speaker configuration. Dolby Atmos uses audio objects to add an elevation to normal multi-channel audio. Dolby Atmosĭolby Atmos is a content creation, encoding, and delivery technology that provides immersive audio to consumers. Dolby has created audio codecs and systems for the delivery of mono, stereo, 5.1, 7.1 and Immersive Audio to consumers for playback in mobile devices, game consoles, laptops and home theater. Dolby Audio enables the means to deliver high quality audio experiences to consumers.
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