![]() ![]() Originally conceived for use with video images, DCT made the concept of “lossy” images such as J-PEG and MPEG acceptable by rounding the values used to express 8x8 blocks of pixels into a smaller number of values, grouped together to avoid redundant bits, and discarding bits deemed perceptually non-essential. ![]() As the basis from which professional Dolby E evolved, Dolby AC-3 is a lossy audio compression algorithm, an ingenious adaptation of the Discrete Cosine Transform. Dolby TrueHD is compressed in transport (on a Blu-ray or UHD Blu-ray disc) but is unpacked as a lossless, multi-channel codec.įormally known as AC-3, Dolby Digital was the worldwide audio standard for DVD, and for HD broadcasting in the United States. This process is utilized by Dolby Digital, Dolby Digital Plus, Dolby AC-4, Dolby E and Dolby ED2 codecs. Encoded, compressed audio and metadata are transported together as a data stream via two digital audio channels, either professional AES/EBU, or consumer S/PDIF (Sony/Philips Digital Interface). In the digital domain, Dolby bit-rate reduction technologies include encoded metadata, which in turn, describes encoded multichannel audio with instructions for precise control of downstream encoders and decoders. For the purpose of answering what is Dolby MAT?, let’s define a few things for context… From the advent (a pun for all the audio old timers, explained at the bottom) of Ray Dolby’s engineering endeavors in 1965 with Dolby A-type Noise Reduction, Dolby’s “double D” symbol has evolved to embody professional audio/video recording and playback technologies we all experience on a daily basis, in a myriad of ways. Just as Kleenex and Jacuzzi represent brand names which have evolved into generalized references for their respective product categories, in the early days of digital home theaters, novices and enthusiasts alike commonly used Dolby Digital as the moniker for 5.1 surround sound, though more accurately, it describes the digital audio encode/decode system developed by Dolby Laboratories. In an acronym-obsessed industry, MAT, as in Dolby MAT, stands for Metadata-enhanced Audio Transmission (fortunately, someone in Dolby’s marketing department avoided the obvious). And no, you won’t need a roll of quarters and liquid Tide, either. Someday, perhaps.however, Dolby MAT is not a final Jeopardy! answer. ![]()
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