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#16
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Jean Fredette wrote:
I have no idea what the third choice switches to though. SPDIF: That's either TOSLink (glowing red LED color, leaks through rubber capped square connector on back of PC), or it can be delivered by legacy copper coax connection (RCA/Cinch connector, same style connector which peppers the back of large screen TV sets). The SPDIF connector isn't keyed, so it can "go in the wrong holes", and with RCA/Cinch you do have to be careful. Audio doesn't have the same attention to detail as computer connectors. At least a few things on computers "won't fit" to help prevent you from blowing stuff up. You can see rather poor examples of both here. (The RCA/Cinch should be showing more metal reflections in the picture.) https://www.dx.com/p/spdif-toslink-t...7#.XJK1YaUwDQx The TOSLink is a fiber optic connection that uses plastic "dental" fiber, the same kind of fiber that conducts light for dental work. The connector is squarish on its perimeter. On the "out" connector, you would see red LED light "leaking" from under the rubber cover on the port. You peel back the rubber cover, before inserting the cable. The RCA/Cinch is for the copper equivalent of the signal. https://en.wikipedia.org/wiki/RCA_connector The signal in that case, is carried on coaxial cable, with RCA/Cinch on either end. The signal might have a characteristic impedance of 50 ohms. The RCA/Cinch is a lousy choice for maintaining a 50 ohm environment (it's not an RF connector). When you look at cable TV connectors, F-series maybe, those are 75 ohms and are going to be closer to being the proper impedance for their application. RCA/Cinch are used for: Audio speakers Line In audio Composite video (red/yellow/white on TV back) YPbPr video ? SPDIF The Speaker Out on a high power stereo, would likely have sufficient amplitude to destroy the SPDIF-In on your AV receiver, if connecting the cable to the wrong holes. But in any case, both TOSLink/RCA SPDIF standards carry a 6Mbit/sec stream, sufficient for two channels of high definition audio. An alternate format, is to support four channels using "fewer bits", which would not particularly be an audiophile choice. I keep seeing references to that mode, but nothing seems to use it. When computers first got "digital audio", it was just that RCA connector. It was only later that TOSLink optical output was offered, and at first, there was an adapter card you put in a PC slot with the simple driving components (LED and switching transistor). Later, TOSLink got put in the I/O plate area, and PCs could have both TOSLink and SPDIF at the same time. When you have both, you can drive two home theater receivers at the same time, since SPDIF is unidirectional and the PC only "sends" to each AV receiver. The TOSLink and RCA, are copies of the same signal. PCs have also had SPDIF-in, but that was only via the adapter card that sits in a slot. The reason the industry tried to "hide" that one, was DRM and "making perfect copies" of audio content. They didn't want to encourage people to use computers to record digital audio. But the *******s did have a way to "get even", as some 24 bit audio sent that way, had the 8 least significant bits "set to zero" to "ruin" the resolution, making perfect copies impossible. So while the user might have a big **** eating grin on their face "recording 24 bit audio", they were in fact only getting 16 bit copies. You could always examine a recording with your hex editor, and figure out you were "ripped off". Paul |
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#17
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Paul posted:
1) All ports have roughly the same resolution choices, I was surprised but you are right that the vga didn't change the resolution from the hdmi. The only difference I notice is the hdmi carries the headphone audio (which I won't likely use but it's ok to have anyways). 2) HDMI appears to have audio in this case. Yes. 3) I can see reports of "funny things happening" with the audio over DVI. It appears it can work. I didn't realize dvi also handled audio. I'm fine with the 10 foot hdmi cable I bought. They had twenty, thirty, forty, and fifty dollar 10 foot cables! I just bought the cheapest 10 foot cable they had. Its called osmartech electronic High-Speed HDMI Cable (10 feet/3 meters) Gaming Edition designed for PS4 and Xbox One Game Consoles Ver 1.4, supports 1080p, 4k2k, Ethernet and 3D supported, The SKU is 7 00253 86173 0 It was 7 dollars. |
#18
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Paul posted:
SPDIF: Thank you for showing the pictures. On the back of the desktop I found near the motherboard a connector that looks the same only with a white covering cap, labeled "Optical Audio Out". I was surprised it wasn't anywhere near the Nvidia GeForce 210 graphics card where it must come with the motherboard. The Speaker Out on a high power stereo, would likely have sufficient amplitude to destroy the SPDIF-In on your AV receiver, if connecting the cable to the wrong holes. I am not an audiophile so I'm only using the "green" connector. There are six different "headphone like" audio jacks on the back. Blue, green, and red in the top row. Brown, black, and grey in the bottom row. I connected separate powered speakers only to the green audio out jack. When computers first got "digital audio", it was just that RCA connector. I think you explained the three software selections [1] E2341 (NVIDIA High Definition Audio) [2] Speakers (High Definition Audio Device) [3] Digital Audio (S/PDIF)(High Definition Audio Device) [1] audio out from the computer through hdmi to the monitor headphone jack [2] audio out from the computer through the green jack to powered speakers [3] unused "optical audio out" which I don't think I will ever need to use I think I'm all set now with the $7 hdmi cable & the software controls! Thank you for your help! |
#19
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In message , Jean Fredette
writes: [] There are six different "headphone like" audio jacks on the back. Blue, green, and red in the top row. Brown, black, and grey in the bottom row. [] Blue: stereo line in. Nov very rare on laptops, usually OK on desktops. Green: stereo line out; may have enough oomph to drive 35 ohm headphones. (Old sound cards - and I'm talking ISA!, like the original SoundBlaster! - sometimes had enough oomph to drive unpowered speakers, e. g. 2 watts per channel; but the almost universal provision of powered speakers stopped sound card manufacturers putting drive in their cards. [I'm pretty sure they predate the colour code.]) Pink: microphone in. Often (usually, I think) mono - it may be a three-terminal connector, but the third is bias volts out for electret mics, not other channel in. Brown, black, grey: for rear channel speakers and sub-woofer, in 5.1 or 7.1 channel use. (I forget which is which.) Those are the defaults; however, many these days have auto-detect, detecting when you misconnect, connecting an input to an output or vice versa. -- J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf in the kingdom of the bland, the one idea is king. - Rory Bremner (on politics), RT 2015/1/31-2/6 |
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