- Joined: July 2003
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Re: Question on 48KHz/24-16 bit
It's all about "word length" and sample rate. In this case 48kHz is the sample rate and the digital bitstream is broken up into either 16 bit or 24 bit words. Both of these are higher than the CD audio standard, which is 44.1kHz/16 bit. the general rule is that the higher the sample rate and longer the word length, the more transparent the audio signal. Sample rates come in multiple "flavours"; as an example, dts has mastered several titles in 96/24, or 96 kHz/24 bit, and Sony's DSD (used on SACD) is a lossless compression system that uses variable word length, as is Meridian Lossless Packing, which is the lossless compression system that forms the basis of Dolby TrueHD. Toshiba marketed DVD players with 192kHz/24 bit processing, but that was a case of oversampling for error correction (something that many CD players boasted of in the late 80s/early 90s).
As far as quality goes, it's a straight GIGO situation: the sound is only going to be as good as the original source. Let your ears be the judge.
\"My opinion is that (a) anyone who actually works in a video store and does not understand letterboxing has given up on life, and (b) any customer who prefers to have the sides of a movie hacked off should not be licensed to operate a video player.\"-- Roger Ebert
- Joined: May 2007
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Re: Question on 48KHz/24-16 bit
I guess with PCM 5.1 audio..
*24bit = 6.9 Mbps
*16 bit = 4.6 Mbps
Right?
I noticed, that e.g. "3:10 to Yuma (2007)" PCM 7.1 was 6.1 Mbps, though..
Rewind - DVDcompare/Site Administrator
*US PS3 (1080p) - Xbox 360 Elite (HDMI) - Nintendo Wii (Euro) - Sony PSP-2000 - Nintendo DSi
*HD DVD Toshiba XE1 (1080p) - Sony Bravia KDL-40W2000 (1080p) - Yamaha RX-V1800 (HDMI 1.3)
- Joined: July 2003
- Location: Lacombe, AB
- Post Count: 2,562
Re: Question on 48KHz/24-16 bit
Are you reading this in the player's literature or on the discs?
\"My opinion is that (a) anyone who actually works in a video store and does not understand letterboxing has given up on life, and (b) any customer who prefers to have the sides of a movie hacked off should not be licensed to operate a video player.\"-- Roger Ebert
- Joined: July 2003
- Location: Lacombe, AB
- Post Count: 2,562
Re: Question on 48KHz/24-16 bit
Now that you mention that it's in reference to TrueHD, I believe you are correct that there are no TrueHD soundtracks above 48/24. In fact, if I recall correctly, when Sony made the announcement that they were going to start encoding their BDs in TrueHD, they stated that they would be encoding in 48/16, which led to some hullaballoo over why they didn't opt for the longer word length. Anyone who recalls the thread better can feel free to chime in on this.
\"My opinion is that (a) anyone who actually works in a video store and does not understand letterboxing has given up on life, and (b) any customer who prefers to have the sides of a movie hacked off should not be licensed to operate a video player.\"-- Roger Ebert
- Joined: June 1999
- Post Count: 236
Re: Question on 48KHz/24-16 bit
Quote:
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Originally Posted by Camper
Mabe it's moot. Maybe there aren't any TrueHD soundtracks above 48/24 available.
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Some concert Blu-rays have a 96kHz/24bit soundtrack. For example, Dave Matthews:
DVD Empire - Item - Dave Matthews & Tim Reynolds: Live At Radio City / Blu-rayBlu-ray Review: Dave Matthews and Tim Reynolds: Live at Radio City | High-Def Digest
Cheers,
Joe
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