DVD-Video Audio Spec. (Dolby 2.0) vs. Blu-Ray Disc Audio Spec. (Dolby 2.0)

[Disco Makberto]

Hi, e-Folks!

Please let me tell you that I have been trying to find information and compare the minimum and maximum bitrates as it pertains to Dolby 2.0 in both DVD-Video and Blu-Ray Disc. For DVD-Video, the minimum bitrate is 64 kbps and the maximum bitrate is 448 kbps. For Blu-Ray Disc, well, I can only find the maximum bitrate which is 640 kbps. I think you know what I am leading to, and that is, what is the minimum bitrate of Dolby 2.0 for Blu-Ray Disc? By the way, when I say "minimum" and "maximum", I am talking about bitrates supported by all or most standalone players.

Carlos Albert Lacaye
Disco Makberto

P.S.: Maybe the answer is 64 kbps, but I am sure I would not be the only one who benefited if the specifications spread on the Internet also included "the minimum". Okay, maybe I need a re-affirmation...bear with me, please! CAL

[guns1inger]

According to Dolby's own papers, the minimum for Dolby Digital is 96 kbps. Some players may well accept lower, although the quality would be awful, even for mono. For Dolby Digital Plus, it can be as low as 30 kbps. (source : http://www.dolby.com/assets/pdf/tech_library/DDPlus_Overview.pdf ). I can't find anything that discusses the minimum bitrate, mainly because the whole push for BluRay is based on how high the qualityis , not how much low quality content you can squeeze onto a disc.

If you really want to find out what the true specs are, fork over some cash and you can buy them here : http://www.blu-raydisc.info/format_spec/obtain_specs.php

[Disco Makberto]

Guns1Inger,

Good to hear from you again, my e-friend!

The reason why I am interested in knowing the mimimum bitrate is not exactly to use that bitrate, but to know the range I can move within. But that only applies to my purposes. You see, knowing the minimum "could be useful" in some instances. For example, I know a senior citizen who is interested in transfering some religious speeches from about a dozen VHS's that he owns. Presumably, those VHS's have mono audio, and I think that not much would be lost by using Dolby 64 or 96 kbps in the transfering onto a BD disc.

Carlos Albert
D-Mak

[guns1inger]

Even at 128 kbps you could store days worth of spoken word audio on a BD disc at half D1 resolution

[Disco Makberto]

Thank you kindly for your information!

CAL
D-M

[Disco Makberto]

P.S.: Now, the only reason to know the "minimum" is just curiosity. If anybody finds it out, please post it. Again, this is simple "curiosity" and nothing more. Incidentally, extended audio specificatios (minimum and maximum, etc.) for DVD-Video can be found here:

http://www.robertsdvd.com/video-audio.html

Carlos Albert
Disco-Mak