Frage von Blackeagle123:
Hello,
To my knowledge, analog video is transmitted via antenna with a maximum of 5.5 Mhz. You can mhz synonymous to many of the state svcd resolution. The digital-tv-picture, the pal resolution of 720x576. Conversely, it means that the resolution of tv-antennas is smaller than that of digital tv? How can it be that both "pal" have resolution?
Also has a channel of lower Mhz on a number of sending a lower resolution? It can not even send you all on the same frequency ... Or?
Best regards,
Constantin
Antwort von Blackeagle123:
I am referring, inter alia, to this thread and the response of Erich.
Link: http://www.slashcam.de/info/PAL-Aufloesung-38220.html
(; There, unfortunately I can not write to / ask, because the link to the original post does not work ...) Thank you in advance!
Best regards,
Constantin
Antwort von WoWu:
@ Constantin
Clearly this may be that the representation of analog TV is worse than an SD display, for example on a computer monitor.
Why is that?
Check again the vertical resolution of the SD signal with its 575 lines of ... because in reality, not 575 rows of pictures are sure to dissolve, but only 575 x 0.65 = 373 lines.
The so-called Kellfaktor.
This circumstance has ruled in the 30s RD Kell (and with these tests in the RCA laboratories that factor, calculated 0.65).
(; There were other values, but let's leave it at it)
Due to the aspect ratio of 4:3 was then synonymous unnecessarily 767 lines in x-direction transfer.
Instead of 7.4 MHz, the Erich reckoned up in another thread already, were actually only 7.4 MHz x 0.65 = 4.81 MHz.
Added to this was that Germany after the war of the CCIR only a bandwidth of 5 MHz has been allocated (and France 6 MHz, England, 5.5 MHz) and thus the required 7.4 MHz transmission quality in any case was not possible.
So once we calculate of the 5 Mhz back to the picture resolution, so we have to do it horizontally with (, 5 MHz x 2 x 52 microseconds) = 520 image points.
Sorry is the added difficulty that has been caused by the color processor next restricted the viewing distance and synonymous with the multipath reception, the range of television broadcasting in Germany.
The usual PAL demodulators in the analog television sets limited the bandwidth of the video signal to 3.5 MHz.
Should we now expect it again?
3.5 MHz x 2 x 52 microseconds =
364 pixels and 373 lines! The 5 MHz is the way to the bandwidth of the desired signal. Where the signal is in the spectrum is another issue.
Incidentally, all signal bandwidths in the country are the same width. So there are no stations of the different transmission standards.
So looked our highly acclaimed analog television system in Germany.
But to say it once more significantly, this quality refers exclusively to the transmission and reception mode.
Therefore, at that time could S-VHS and score the tapes from the video store as well in terms of quality S-VHS and Hi8 shone with 5 MHz resolution.
The DVD reached by the digital storage of approximately 550 pixels in the horizontal resolution.
Antwort von Blackeagle123:
Hey,
Thanks for the great explanation. But does that mean that there was no time in the analog standard such as PAL? The resolution, connected with the TV quality was therefore of one country to another?
And another question regarding Kellfaktor: If you can halve the resolution, and then still have the same "-visible" quality is, then you can still theoretically halve again and again has the same "-visible" quality and so next ;-)
Best regards,
Constantin
Antwort von WoWu:
@ Constantin
However, a PAL standard there, because yes, PAL has referred only to the type of transmission. The quality of transmission was, however (in the countries; marginally) better to have transferred more than 5 MHz. For example, Britain with 5.5 MHz.
The resolution can not simply cut in half while maintaining quality ... The picture is even much worse, so does SD, which does not run through the described pathway already significantly better (; example of downconverted HD) on a calculator, as what could be behind broadcast on analog TV. After that were synonymous until maybe a few small differences, no better quality more visible.
So it's not as if the analog TV picture look as good as a double (; or even 4-fold) as high-resolution picture.
One can never be synonymous with his lack of the viewing distance, because the screen size and resolution so determine the size of the pixels and which, in relation to the viewing distance is a measure of what our eye sees are.
But theoretically you would be right, but you just need more of next off your monitor ... very quickly the picture is so small that you no longer recognize, and the resolving power of the eye is no longer sufficient.
So you see, the thing with the dissolution takes place in the context of some of manageable parameters, with a sound is determined by such a transfer.
Therefore, one may debate the HD (; Align 720 or 1080) is not exclusively synonymous to the spirit
"more pixels is always good." Exactly the same is not true, because it must pay some synonymous.
Antwort von Blackeagle123:
Hey,
I have now synonymous understand the exact difference between analog and digital PAL. Although the name of a digital NTSC PAL no longer makes much sense! (; Now if I have understood everything correctly ... For the color coding is produced only in the player.)
The phase-alternation-line method [fejz RltYnejƒYn lajn] PAL, short, is a method of color transmission in analog TV. It was developed with the aim of distracting color errors that are in the NTSC procedures manual and can only be compensated for unsatisfactory compensate for auto. The method is based on the idea that two successive scan lines have more similarities than differences, because there are pictures of planes. The technical trick of the red color difference signals each second image line to the previous 180 degrees out of phase (; therefore transferred the name) that makes it possible to abolish completely the receiver side by setting off one of the two lines might occur hue error, only a small chroma - error remains. According to wikipedia table was in Germany, but with the standards "PAL-B/-G, PAL-D/-K transfer", which means that with was at least 5MHz-6MHzübertragen, while in the United Kingdom was transferred Pal-I? Perhaps we speak of different times?
Best regards,
Constantin
Antwort von WoWu:
@ Constantin
Although the name of a digital NTSC PAL no longer makes much sense! Since you have more understanding than many insane, not only in this forum to differentiate between analog and digital is not even real (; may want what synonymous (always) and more synonymous than many marketing people), advertising Fritzen, for which synonymous PAL is still mostly in the glossy brochures.
Your Wikipedia quote shows how it is not done in the same digital transmission. Yet everything is for them PAL ... kopfschüttel
But with the concepts seem so to be a cause. PAL was really a good procedure, but is analogous in many countries (yes, or is already) before the shutdown. In the U.S., so the change is already the 2nd Generstion HD streaming before.
So
anlaog should really be past for us.
Antwort von Blackeagle123:
And there is no better in the digital standard in order to finally get to schlehtem receiving the pixel off? It would be frankly an image noise, a worse resolution, etc. rather than pixels in the jerky picture, so you can see hardly anything.
Best regards and many thanks!
Antwort von WoWu:
If it had been almost, if not with its unspeakable Kirch D-Box had forged ahead, which was rather cobbled together.
Grace degradation is a
full function in the MPEG2 transmission, which would have specifically adopted this problem ....
Was unfortunately nothing .... anything with a hot knitting needle and then cemented.
But how do you'll get your digital signal ... via antenna.? .. that would be DVB-T, since it helps an antenna amplifier or an antenna with better directivity ... synonymous or even a more sensitive receiver.
Antwort von Blackeagle123:
Hey,
no, I have digital satellite. So DVB-S. Since the reception is okay, but when it comes to HD, jerky, in part, because the distributor is sitting too far away ...
Moreover, still comes to this nonsense that it barely gets a signal when the cordless phone rings - which broadcasts on a same frequency as the transmitter, the transponder of the Pro7, Sat1, RTL, etc. are! ;-)
Best regards,
Constantin
