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Author Topic: Digital Specifications Mathias Andersson Film Handler Posts: 26 From: Sweden Registered: Oct 1999 posted 11-09-1999 07:57 AM                     What are the technical specifications for the diffrent digital sound formats? My research came up with the following information: DOLBY DIGITAL samplingfreq: 48 kHz, resolution: 16 bit bitrate: 320 kbps, dynamic range: 92 dB DTS samplingfreq: 44,1 kHz, resolution: 20 bit bitrate: 1103 kbps, dynamic range: 96 dB SDDS samplingfreq: 44,1 kHz, resolution: 20 bit bitrate: ??? kbps, dynamic range: 90 dB CDS samplingfreq: 44,1 kHz, resolution: 16 bit bitrate: ??? kbps, dynamic range: 90 dB Could anyone fill in the gaps and make possible corrections. I know there are more specifications, but let's start here And...of course...I want the theoretical specs of each format, not the hardware specs, if you know what I mean.  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 11-09-1999 07:46 PM                        SDDS is 16-bit, not 20, and features ATRAC version 2 compression, the same as the second generation of MiniDiscs, which apporximately 5:1 compression (closer to 4.5 or so). Dolby Digital (theatrical) is 12:1 compression (AC-3)but the home version is much less than that. You're pretty much right on the money with DTS. I'm not sure what DTS calls their compression scheme, but I have heard "Coherent Acoustics" however I'm not sure if that is only for the home version, which has yet even less compression. Try downloading the CDS manual from this site to see if it gives you the specs that you need.  |  IP: Logged Mathias Andersson Film Handler Posts: 26 From: Sweden Registered: Oct 1999 posted 11-10-1999 06:25 AM                     The compression scheme DTS is using is called APT-X100, developed by Audio Processing Technology - hence APT. www.aptx.com  |  IP: Logged Stefan Scholz Expert Film Handler Posts: 223 From: Schoenberg, Germany Registered: Sep 1999 posted 11-10-1999 10:46 AM                        Compression rate on ATPX-100 about 4.5 : 1, that's right. Sony states their 4.5 as 5, DTS as 4, depends on your rounding. Data transfer rate on SDDS approx 8000 kbps, the highest of all systems, but has to feed 12 full rate channels, as Subbass is backed up and discrete fullfrequency (20 khz).  |  IP: Logged Mathias Andersson Film Handler Posts: 26 From: Sweden Registered: Oct 1999 posted 11-10-1999 04:52 PM                     Stefan, Is the bitrate for SDDS always the same? I mean with both 5.1 and 7.1 channels? If so, the compression rate is varying and would make the sound "quality" better with 5.1 channels than 7.1. I also thought the right side track (SDDS) was identical to the left, but I've heard that this is wrong. And that the backup track sound worse...  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 11-10-1999 06:44 PM                        The compression rate for SDDS is constant, I know that. From what I know (and I could be wrong) ATRAC compression works in full bandwidth stereo pairs, so there are always four pairs of tracks on any given film, and some of them may not be used. Add to that the crappy back-up tracks. Also, it is not 5.1 or 7.1, but 6 or 8. The subwoofer channel is FULL bandwidth, they just don't use it that way.  |  IP: Logged

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