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Hi,
I would like to know whether there is anyone upgrade the SATA II cable inside your HD/BD player or not. (OPPO 83,93, 95, Dune, etc.) It links from BD drive to PCB board. I heard that this will improve picture quality (at cheaper price than other upgrades). Is there any high quality SATA cable in the market? especially with teflon insulated, silver or silver plated.
thank you,
Follow Ups:
I don't know if one exists, but you could wire it up yourself. If you're going for the ultimate, solid silver might be the ticket. I wasn't aware that there were users out there that have made these mods with great success. Do you have a link?
> Is there any high quality SATA cable in the market? especially with teflon insulated, silver or silver plated.
Even if there are such SATA cables, you would be wasting money and effort using them. The picture quality of the digital video cannot be improved (nor be subject to deterioration) by the cables carrying packetized digital data.
You really should educate yourself on the differences between analog and digital video, and storage and transmission methods. The disadvantage of digital video and audio is that the continuous waveform has to be sampled and quantized. For digital video (and some audio formats) that data is then encoded and compressed and some information/data is thrown away! The big advantage (once the video is digitized) is that this data stream can be stored/transmitted and then retrieved/received with high integrity. No noise can be added to the digitized data. If the signal is corrupted, then it will be detectable (and maybe even correctable). It's when you want to convert that digital video or audio signal to analog is when you need to be concerned about noise, impedance et cetera again.
BTW I have Nordost teflon-jacketed, silver-plated interconnects in my audio rigs, but that's for low-level analog audio. Computer and other digital cables only need to be just PVC-jacketed plain copper.
Regards
Are you sure that there is no difrference for digital video signal? I don't know it because I just start playing home theater hobby. But from my experience with audio, when I change digital cables from CDP to DAC (both coaxial and toslink cables) or analog cables, my system will sound differently.
If there is no difference for digital video signal like you said, why do different HDMI cables have different picture? Like XLO HTPRO, AQ Diamind, WW Platinum, Cardas, PAD, free HDMI comes with TV,etc.? Or HDMI is not a digital signal? That would be great if you could explain me in more details.
regards,
Hi there
> Are you sure that there is no difrference for digital video signal?
If you carefully reread my post, I qualified my response by writing "packetized digital data". That is because not all digital interfaces are equally reliable.
At least three layers of a digital interface need to be evaluated.
1. The physical layer.
This is the cable (and connectors) that you can actually see and touch. This cable could be coaxial with just a single conductor and shield (as used by S/PDIF digital audio), or a multiconductor (as used by SATA) for several signals.
2. The electrical layer.
This is where it starts to get technical and less comprehensible since you cannot see these concepts. S/PDIF digital audio uses single-ended signaling (same as unbalanced analog audio using RCA connectors). SATA is a full duplex (two directions) communications link and uses differential signaling to reject noise (same a balanced analog audio using XLR connectors).
Note that digital demodulation techniques are tolerant of noise and signal degradation far better than analog demodulation. Analog signals are degraded by noise and attenuation when the waveform is changed because the information is carried by the waveform itself. But a digital signal can be tolerant of changes to the waveform since demodulation (translating "symbols" to bits) relies on ranges of amplitude or phase (rather than precise values or conditions). It's ironic that "digital" whatever is perceived/marketed as precise and analog is inaccurate, but it is actually the other way 'round when it comes to demodulation.
3. The data layer.
This layer organizes the data, and can provide identification and data integrity checks. S/PDIF digital audio uses a rather simple protocol, and streams the data. SATA uses SCSI command and response packets to transfer data, obtain device status and perform device operations. Data transfers can be validated, and if data corruption is detected then the data packet can be retransmitted or the entire operation can be retried if necessary. The data protocol adds reliability to the underlying transport layers (in the same manner that TCP is reliable but IP and Ethernet are not).
The SATA interface is far more sophisticated than the S/PDIF digital audio interface. You're comparing a *reliable* data connection used as a computer peripheral (where data corruption cannot be tolerated) to a data connection that does not have serious consequences if data corruption goes undetected.
> If there is no difference for digital video signal like you said, why do different HDMI cables have different picture?
I don't know much about HDMI other than it carries an uncompressed digital video signal and that is has some bi-directional capability (mostly for copy protection schemes rather than data integrity). But I'm quite sure that there is no agreement that "different HDMI cables have different picture" in the technical community.
I responded to your original question about SATA cables. I do not want to get into a S/PDIF and jitter or HDMI cable discussion.
Regards
-
Different HDMI cables look and sound different. Digital audio cables were thought to not possibly make a difference and now those differences are understood. I find significant differences between digital audio cables.
Edits: 04/10/11
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