DTS är väl inte nödvändigtvis bättre än DD?
"On Standard-Def DVD, there are essentially only two competing sound formats to choose from: Dolby Digital or DTS. Both can accommodate movie soundtracks from monaural 1.0 to multi-channel 5.1, and in some cases add a matrixed center back channel as well (DTS also offers a discrete 6.1 option on selected titles). A small number of discs (mostly music concerts) may provide 2-channel PCM audio, but those are few and far between. As a rule of thumb, it's Dolby or DTS. The DVD spec requires all discs to contain either a Dolby Digital or PCM soundtrack as the base standard (pretty much everyone uses Dolby), and all DVD players are required to decode both. DTS is optional, and is generally considered (fairly or not) an added-value feature. Though it hasn't always panned out that way in actual practice, there is a perception in the DVD marketplace that DTS is the "better" sound option that will provide greater fidelity to the source. Sometimes that's true and sometimes not, but that's a discussion topic for another day. The reality of the situation is that both Dolby Digital and DTS are capable of delivering very good, sometimes even exceptional sound quality on DVD.
Both Dolby Digital and DTS are "lossy" compression codecs. Before making it to disc, each format selectively filters out data from the studio's digital audio master using perceptual encoding techniques. In theory, the data removed should consist mainly of either frequencies beyond the range of human hearing or frequencies that would normally be masked by other frequencies in the track anyway. If done properly, the end result should sound seamless to the listener. But if done poorly or over-compressed, the audio may lose fidelity.
Standard Dolby Digital can be encoded in a variety of bit rates, the most common being 192 kb/s (reserved for 1.0 or 2.0 soundtracks and generally poor fidelity), 384 kb/s (OK quality), and the maximum 448 kb/s (used on the majority of DVD 5.1 soundtracks). DTS has two bit rate encoding options: the commonly used 754 kb/s or a rarely offered high rate of 1.5 Mb/s. Within each format, the higher the bit rate means the less compression needed and the less data removed from the master. However, it also means that the audio track takes up more disc space, which can eat into the bit rate allocated to video quality. Also note that Dolby and DTS use entirely different compression techniques, and their bit rate numbers are not directly comparable to one another. While a 448 kb/s Dolby track is better than a 384 kb/s Dolby track, a 754 kb/s DTS track is not necessarily better than a 448 kb/s Dolby track just because the number is larger. Dolby uses more efficient compression techniques than DTS and can usually achieve results at 448 kb/s comparable to DTS at 754 kb/s. "
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