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From: Priam on 2 Jan 2010 01:06 On 01/02/2010 12:54 AM, JF Mezei wrote: > Lloyd Parsons wrote: > >> Dolby 5.1 and DTS will go just fine over 2 wire copper feeds from >> digital connection. > > The only copper which tranmsits digital audio are HDMI cables. "HDMI supports, on a single cable, any TV or PC video format, including standard, enhanced, and high-definition video; up to 8 channels of digital audio; and a Consumer Electronics Control (CEC) connection. The CEC allows HDMI devices to control each other when necessary and allows the user to operate multiple devices with one remote control handset.[2] Because HDMI is electrically compatible with the signals used by Digital Visual Interface (DVI), no signal conversion is necessary, nor is there a loss of video quality when a DVI-to-HDMI adapter is used.[3] As an uncompressed connection, HDMI is independent of the various digital television standards used by individual devices, such as ATSC and DVB, as these are encapsulations of compressed MPEG video streams (which can be decoded and output as an uncompressed video stream on HDMI)." http://en.wikipedia.org/wiki/HDMI You pay be right, I have no idea. If my card outputs 7.1 or 8 channels, there sure is a way to transport it. So, if it's not optical fibre, what justifies the $2000 extra you paid for your Mac?
From: JF Mezei on 2 Jan 2010 01:16 Priam wrote: > Mezei, what next? Optical fiber doesn't justify the $2000 extra you paid > for your Mac Pro. The sales girl at the place of worship (Apple Store) was very cute and very friendly. And Steve Jobs makes some of the best presentations ever.
From: Lloyd Parsons on 2 Jan 2010 08:45 In article <00b02bd9$0$8169$c3e8da3(a)news.astraweb.com>, JF Mezei <jfmezei.spamnot(a)vaxination.ca> wrote: > Lloyd Parsons wrote: > > > Dolby 5.1 and DTS will go just fine over 2 wire copper feeds from > > digital connection. > > The only copper which tranmsits digital audio are HDMI cables. Normal > RCA outputs cannot transmit true Dolby 5.1 or DTS surround sound. They > can only transmit stereo (2 channel) analogue sounds. Many amplifiers > can synthesize 4 channel audio from 2 channel audio: > > what is unique to left goes on left > what is unique to right goes on right > what is common to left and right goes on centre > what is common to left and right, but right has amplitude of -100% goes > in rear speakers. You need to get out more. :) On many source units and AVRs are 2 digital audio ports that support Dolby 5.1 and DTS (not the newer hi-res codecs though), one will usually be optical (toslink), the other is coax. Both work fine. DD an DTS are sent as encoded packets and are decoded in the AVR (or other destination device) and converted to analog for the speakers/headphones. Note this is NOT synthesized and was around long before HDMI was even a thought in the committee that designed it was borne.
From: Lloyd Parsons on 2 Jan 2010 08:49 In article <hhmn1c$897$1(a)news.eternal-september.org>, Priam <priam(a)notsosure.com> wrote: > On 01/01/2010 11:04 PM, Lloyd Parsons wrote: > > In article<0185d3b1$0$24660$c3e8da3(a)news.astraweb.com>, > > JF Mezei<jfmezei.spamnot(a)vaxination.ca> wrote: > > > >> Priam wrote: > >> > >>> Honestly, I don't know much about sound, but I doubt optical fiber will > >>> improve 16 bit sampling. > >> > >> Optical fibre allows you to send a large number of separate audio feeds. > >> A copper solution lets you send only left and right audio signals. (you > >> can encode 4 channels in a left-right but those are not fully seperate > >> feeds). > >> > >> Dolby 5.1 has 6 separate channels. And with fibre, you can also send 7 > >> channel audio. None of these can be transmitted with 2 wire copper feeds. > > > > Dolby 5.1 and DTS will go just fine over 2 wire copper feeds from > > digital connection. > > Seems you're right, bu I had to check this. > > My integrated sound chip specs: > > 1. Realtek ALC888 codec > 2. High Definition Audio > 3. 2/4/5.1/7.1-channel > 4. Support for S/PDIF In/Out > 5. Support for CD In > > <http://www.gigabyte.com.tw/Products/Motherboard/Products_Overview.aspx?Produc > tID=3096> > > I must admit I'm surprised it does 7.1. At this price, they usually > "only" do 5.1. I couldn't care less about this. I use headphones on the > chip's preamp. It doesn't disturb anybody :) > > "There are no differences between the signals transmitted over optical > or coaxial S/PDIF connectors—both carry exactly the same information. > Selection of one over the other rests mainly on the availability of > appropriate connectors on the chosen equipment and the preference and > convenience of the user. TOSLINK cables do not work well (and may even > suffer permanent damage) if tightly bended, and their high light-signal > attenuation limits their effective range to 6.1 metres (20 ft) or so. On > the other hand, TOSLINK cables are not susceptible to ground loops and > RF interference, like coaxial cables.[2] Another deciding factor for > many is cost: any standard 75 Ω A/V cable can be used for coaxial > connectivity, while TOSLINK requires a specific cable which, until > recently, was not very affordable." > > http://en.wikipedia.org/wiki/S/PDIF > > I doubt very much that coax suffers from interference in a house. > > Mezei, what next? Optical fiber doesn't justify the $2000 extra you paid > for your Mac Pro. Priam on your motherboard, regardless of what the mfg may state, you won't get more than DD 5.1 or DTS 6.1 (older codecs) output on optical or coax. ALL the new hi-res, and 7.1 and above codecs require either : 1. HDMI - will send them as discrete digital signals 2. Multi-channel coax - sends each channel via a coax cable for each channel. (analog).
From: JF Mezei on 2 Jan 2010 15:36
Lloyd Parsons wrote: > On many source units and AVRs are 2 digital audio ports that support > Dolby 5.1 and DTS (not the newer hi-res codecs though), one will usually > be optical (toslink), the other is coax. Both work fine. But neither are considered "copper" wires. > Note this is NOT synthesized and was around long before HDMI was even a > thought in the committee that designed it was borne. Correct. But when using copper wires, you only have 2 channels to work with, and Dolby Pro Logic will synthetize 4 channels from it. |