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[Bit-tech] WireDream claims audio boost with silver SATA cable - Page 7

post #61 of 88
Quote:
Originally Posted by guyladouche View Post

I might be totally uneducated on digital audio, but don't you either get the audio signal, or you don't get the audio signal--there's no real quality loss as you vary the composition/"purity" of the cable. Right?

There shouldn't be unless you're doing extremely long analog runs... I'm not expert though, maybe someone could shed some light on that.
post #62 of 88
Yes and no. A lot of cheap headphones only use 1 small strand of cheap copper running to the ear buds which obviously produce a crappier sound, while the more expensive ones that produce great audio use a heavier gauge bundle of more expensive, purer copper wiring to produce a cleaner signal. Basically the smaller the wire, the less current goes through it so it produces a more "limited" sound. Think of it as the same way your house electricity is run. You don't want your 120V house current to run on a wire that's as thin as a Christmas lights strand.

This applies to analog signals more than digital. Of couse the speakers play a huge role into it too. The gold plated connectors I see keeping the ends free from corrosion rather than audio quality, but that's just my opinion.

I wish more games took advantage of optical connections though I know a couple games I have had trouble trying to get 5.1 audio to work on my receiver. Watching a DVD or Blu-Ray, that always worked in 5.1 on optical. Games I had to revert to analog to get those working.

These SATA cables are a bunch of bologna! These make much sense as the $1K+ HDMI cables that are out there.
post #63 of 88
Anyone else see audio in the title?

Still trying to figure out how sata affects audio
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post #64 of 88
Le sigh.
When will people learn.

Digital signals are VERY resistant against the effects of noise and distortion.
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post #65 of 88
Quote:
Originally Posted by P.J View Post

So what's the difference between digital and analog? xD
i'm glad you asked thumb.gif

Imagine a random analog audio signal, its going to look something like this
img1te.png
As you can see there is lots of wavy action going on with a variable frequency, the medium which it is traveling through (cable) will have a sensible impact on what comes out the other end.


Now lets take that same analog signal and turn it into digital, this is what for example goes through your hdmi cable
digitalsignal.gif
As you can see there is NO curvy or variable action going on at all, it is just on or off at the same frequency, all the time. (some people confuse digital signal with sampled audio signal curves which look like the first one but more blocky, well that is wrong. that is actually digital content represented as analog signal) If there is going to be an error in the signal it is always generated by the sending or receiving device, never the cable, why never the cable? Because its a friggin on/off cable, even if it was made of wet wood it wouldnt distort the signal enough to produce an error - you cant distort on/off.
Edited by hazarada - 3/31/12 at 12:57am
post #66 of 88
Quote:
Originally Posted by hazarada View Post

As you can see there is NO curvy or variable action going on at all, it is just on or off at the same frequency, all the time. (some people confuse digital signal with sampled audio signal curves which look like the first one but more blocky, well that is wrong. that is actually digital content represented as analog signal) If there is going to be an error in the signal it is always generated by the sending or receiving device, never the cable, why never the cable? Because its a friggin on/off cable, even if it was made of wet wood it wouldnt distort the signal enough to produce an error - you cant distort on/off.

That's not really right either. I'm not familiar with the HDMI physical layer, but even "on-off" signaling at that frequency is not going to look like that because obviously the bandwidth of the system is limited. You won't get the sharp instantaneous transitions like that. It's a useful model for visualization, but if you were to take a high-speed scope to the output, I don't think you'd actually see something like that, even noise aside, which is what I think you're implying.

Regardless, you can check the eye diagrams of standard HDMI installations and see that indeed the probability that a bit gets flipped is very very very low generally. Also for HDMI I think there's furthermore some forward error correction code applied to the data island period, in which the audio data is sent.


Also, I think a lot of people have some exaggerated conception of the degradation you get with a standard interconnect passing audio frequency signals a few meters (it's quite small). That's not really a good example to bring up to contrast a digital baseband communications system.
post #67 of 88
Quote:
Originally Posted by Lareson View Post

Yes and no. A lot of cheap headphones only use 1 small strand of cheap copper running to the ear buds which obviously produce a crappier sound, while the more expensive ones that produce great audio use a heavier gauge bundle of more expensive, purer copper wiring to produce a cleaner signal. Basically the smaller the wire, the less current goes through it so it produces a more "limited" sound. Think of it as the same way your house electricity is run. You don't want your 120V house current to run on a wire that's as thin as a Christmas lights strand.

No this is not true, except at extreme lengths.

Unless there is damage the signal should sound the same. This is especially true with digital where it either is or isn't there. All measurements have shown this, as have tests on humans.

I'm surprised to even see this show up on overclock.net since I thought this site was about science...
post #68 of 88
Quote:
Originally Posted by mikeaj View Post

That's not really right either. I'm not familiar with the HDMI physical layer, but even "on-off" signaling at that frequency is not going to look like that because obviously the bandwidth of the system is limited.
nope, i had to make a report on a lvds interface just last week (with quite similar physical properties to hdmi) and that is exactly how it looks like on an oscilloscope(well aside from being upside down)
Edited by hazarada - 3/31/12 at 5:30pm
post #69 of 88
And I claim I poop better on a golden plated toilet.

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post #70 of 88
Quote:
Originally Posted by perfectblade View Post

No this is not true, except at extreme lengths.

Yes it is.

The cable is a capacitor, and it smoothens out signals. Also, it acts as a resistor, adding a resistance that sort of adds to the impedance of the speakers, that in turn modifies their performance.

The cable is important up to an extent. If you use an adequate gauge copper cable, it isn't gonna sound worse than an iridium core platinum shielded silver cable thumb.gif
   
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