HDMI Cable Quality?

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HDMI Cable Quality?, Really make a diffrent?

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SiriuslyCold

Nov 5 2009, 03:43 PM

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thing is if you are using cap ayam (digital interconnect, or HDMI) cable and it works for you don't have to gatal2 go and try expensive cable. Because you might hear or see a difference and that could make you dissatisfied

Dark NT

Nov 5 2009, 03:45 PM

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fun_feng,

can you then relate this theory to a transfer of a say, Excel file. No matter what type of USB cable u use to transfer from a HDD to another HDD, the content of the excel file will always be the same.

how is this different from HDMI that carries video/audio signal in digital too?

anfieldude

Nov 5 2009, 03:46 PM

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QUOTE(fun_feng @ Nov 5 2009, 03:40 PM)

Firstly each pixel has 32 bits (0,1), so a FULL HD 1080p is 2 million x 32 bits = 64mil bits.
Assume a 60Hz refresh rate which means 60x64 mil bits = 3.84Gbps + additional bits for CRC, audio and god knows what... is well within the range of HDMI 1.3 (10.2 Gbps)

YOu must understand 0 or 1 is not ON or OFF this simple in this case. These 32 bits represent a coding that the TV understand so that it will project a color to the pixel.

Then you must also understand something call CRC (Cyclic Redundancy Check). These bits transmit throught the cable in "packets". Any corrupted bits in the packets gets detected by the CRC algorithm which the TV calculates. Now the TV know that the packet for this particular pixel is spoilt, the TV will most probably display a default color for it, white if i am not wrong.

You are correct you will still get a picture, but not getting the FULL picture. But if a few thousands pixels are corrupted, most probably your picture will have white patches on it. You will not get clearer picture, red is redder, sky is bluer etcc....
Anyway, the probabllity of getting corrupted bits is probably 0.0001%.

The colour bits are a bit more complicated than that with the sub pixel yet to be talked about. But your explanation shd be enuf for most to get the jist.

However, moomoos sees something different. Let's leave it at that.

I for one have not seen differences and the measurement equipment I have also does not show anything different. However, picture noise and sharpness are pretty subjective and cannot be measured.

Maybe the next time I'm in Ipoh I can take a look and see it on his screen.

ar188

Nov 5 2009, 03:47 PM

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QUOTE(fun_feng @ Nov 5 2009, 03:40 PM)

You are correct you will still get a picture, but not getting the FULL picture. But if a few thousands pixels are corrupted, most probably your picture will have white patches on it. You will not get clearer picture, red is redder, sky is bluer etcc....

good luck explaining this bit to them..

(already tried, but failed)

Added on November 5, 2009, 3:49 pm

QUOTE(Dark NT @ Nov 5 2009, 03:45 PM)

fun_feng,

can you then relate this theory to a transfer of a say, Excel file. No matter what type of USB cable u use to transfer from a HDD to another HDD, the content of the excel file will always be the same.

how is this different from HDMI that carries video/audio signal in digital too?

as he mentioned, most of the time it's the same when you transfer over, but when got error like CRC... then the file is screwed..

but the file error will not be like suddenly got 100word extra essay inside it..

This post has been edited by ar188: Nov 5 2009, 03:49 PM

fun_feng

Nov 5 2009, 03:51 PM

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QUOTE(moomoos @ Nov 5 2009, 03:13 PM)

Added on November 5, 2009, 3:28 pmDecision time

10101010101010110101010010110010101010100100100101010011010101010101001010101010101001010100101101001010 eg 1

10101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010 eg 2

looks identical correct, if yoo really count the pixel you compare you can see correct eg 2 is original signal and eg1 is the receiving signal

so what if the HDMI cable cant decide and just alters the signal... ?

cant imagine if you have 2.7million pixels

gracias

Ok, i see you don't quite understand coding means. These coding is industry standard. like this http://en.wikipedia.org/wiki/SRGB
These bits is a language that only processors understand.

10101010101010110101010010110010101010100100100101010011010101010101001010101010101001010100101101001010 eg 1 might represent red

10101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010 eg 2 might represent blue..

So if the bits get screwed up, your red apple might be blue in color.

But of course, we have come a long way in visual display, these things doesn't happened. The TV will detect the error and attempts to correct it. If it fails, then it display a white color.

Again let me assure you, these corruptions is vy rare, otherwise it will not be an industry standard

Johannbeckham

Nov 5 2009, 04:04 PM

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QUOTE(Johannbeckham @ Nov 5 2009, 03:33 PM)

so you mean there is no difference if I use DisplayPort Cable compare to HDMI cable for my current set-up(CPU with graphic card having HDMI, DisplayPort and optical sound connection and display the video in DELL 2408WFP. My speaker for now is 2.1 speaker with optical sound connection)? Is there no advantage of HDMI cable over DisplayPort cable if I have the same port on my CPU?

Guys, follow-up on my question about. Is there a big difference between DisplayPort Cable and HDMI cable? Coz I only have display port cable as of now (bundled when I buy DELL 2408WFP). What is the advantage if I use HDMI cable instead of DisplayPort cable

anfieldude

Nov 5 2009, 04:07 PM

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QUOTE(Johannbeckham @ Nov 5 2009, 04:04 PM)

Guys, follow-up on my question about. Is there a big difference between DisplayPort Cable and HDMI cable? Coz I only have display port cable as of now (bundled when I buy DELL 2408WFP). What is the advantage if I use HDMI cable instead of DisplayPort cable

I thought I answered already. No differences. They are competing technologies. Display Port shd be fine.

Johannbeckham

Nov 5 2009, 05:37 PM

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QUOTE(anfieldude @ Nov 5 2009, 04:07 PM)

I thought I answered already. No differences. They are competing technologies. Display Port shd be fine.

Ok...then no need to buy Monster HDMI cable lah...Coz my friend suggested me to buy. If there's no difference, there's no need to buy. Thanks anfieldude!

arremie

Nov 5 2009, 05:47 PM

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QUOTE(Johannbeckham @ Nov 5 2009, 05:37 PM)

Ok...then no need to buy Monster HDMI cable lah...Coz my friend suggested me to buy. If there's no difference, there's no need to buy. Thanks anfieldude!

don't buy monster. buy qed. nice purple color

mpyw

Nov 5 2009, 06:04 PM

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I used Monoprice all the way....

cheap and colour coded

moomoos

Nov 5 2009, 06:11 PM

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QUOTE(Johannbeckham @ Nov 5 2009, 05:37 PM)

Ok...then no need to buy Monster HDMI cable lah...Coz my friend suggested me to buy. If there's no difference, there's no need to buy. Thanks anfieldude!

yes you could be correct, the differences is almost negligible, depending on your setup, 32" 40" 46" 52'

well mine is just different as i'm using 50" 3LCD Single gun projection TV ( well maybe old technology) and maybe on a true 1080i or full HD 1080p the difference is +/- 0.0001 to the human eye

Added on November 5, 2009, 6:13 pmyou can try spiderman 3 on the sandman scene,
if there are no differences just sapu the cheaper cable

oh sorry wrong reply

This post has been edited by moomoos: Nov 5 2009, 06:39 PM

SiriuslyCold

Nov 5 2009, 07:24 PM

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QUOTE(Johannbeckham @ Nov 5 2009, 05:37 PM)

Ok...then no need to buy Monster HDMI cable lah...Coz my friend suggested me to buy. If there's no difference, there's no need to buy. Thanks anfieldude!

see below

QUOTE(mpyw @ Nov 5 2009, 06:04 PM)

I used Monoprice all the way....

cheap and colour coded

Scud_eSpade

Nov 5 2009, 09:24 PM

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Well, seems a lot of you is very good in theory. but you guys are missing something. Its true a digital signal is either ON or OFF. But in real life, the signal is more like analog (sine wave) due to resistance or others

no need to buy expensive cable. my company is developing alternative to HDMI using optical. Will save you a lot of buck next year.

iZuDeeN

Nov 5 2009, 09:28 PM

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there is no diff with RM30 HDMI cable or RM300 Monster HDMI cable...

the only diff is your setup....

who ever say the can hear a diff must have a DOG's hearing ( can hear <20Hz) or a total bullshit...

HDMI carries digital signal, not analog signal which require ADC, thus a 'high end' cable will make a diff for analog signals...

robertngo

Nov 5 2009, 10:55 PM

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QUOTE(Scud_eSpade @ Nov 5 2009, 09:24 PM)

Well, seems a lot of you is very good in theory. but you guys are missing something. Its true a digital signal is either ON or OFF. But in real life, the signal is more like analog (sine wave) due to resistance or others

no need to buy expensive cable. my company is developing alternative to HDMI using optical. Will save you a lot of buck next year.

your company is developing a rival connection to a universally supported connection standard? what port it will be connected to?

moomoos

Nov 5 2009, 11:29 PM

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QUOTE(robertngo @ Nov 5 2009, 10:55 PM)

your company is developing a rival connection to a universally supported connection standard? what port it will be connected to?

HDMI version 1.4 that carries Networking together ....????

This post has been edited by moomoos: Nov 5 2009, 11:33 PM

ar188

Nov 5 2009, 11:45 PM

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QUOTE(Scud_eSpade @ Nov 5 2009, 09:24 PM)

Well, seems a lot of you is very good in theory. but you guys are missing something. Its true a digital signal is either ON or OFF. But in real life, the signal is more like analog (sine wave) due to resistance or others

no need to buy expensive cable. my company is developing alternative to HDMI using optical. Will save you a lot of buck next year.

OK, if that cool optical next gen cable comes free with my next TV and media player.. why not.. support..

Scud_eSpade

Nov 6 2009, 07:31 AM

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QUOTE(robertngo @ Nov 5 2009, 10:55 PM)

your company is developing a rival connection to a universally supported connection standard? what port it will be connected to?

its the HDMI standard but using optical instead of copper in the transmission line. So you can imagine something like fiber optic (but its not). small only unlike copper. hope it will be ready by next year

fun_feng

Nov 6 2009, 09:30 AM

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QUOTE(Scud_eSpade @ Nov 5 2009, 09:24 PM)

Well, seems a lot of you is very good in theory. but you guys are missing something. Its true a digital signal is either ON or OFF. But in real life, the signal is more like analog (sine wave) due to resistance or others

Since the analog signal only carries the interpration of 0 or 1, the error margin is big, you don't need a super quality cable to do the job.
Any decent cable will do the job.

anfieldude

Nov 6 2009, 09:39 AM

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QUOTE(fun_feng @ Nov 6 2009, 09:30 AM)

Since the analog signal only carries the interpration of 0 or 1, the error margin is big, you don't need a super quality cable to do the job.
Any decent cable will do the job.

I admire your patience in educating people.

BTW: Do PM me what the importance of Nov10 is...

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