Talk:Broadcast television systems

message: Why is there no system J?? 66.32.240.129 14:07, 6 Sep 2004 (UTC)
replies: text: Because I and J are often confused. Anorak2 11:04, 1 February 2006 (UTC)
replies: text: There is a system J, see the table again. System J is the Japanese system and it differs only from the American system M in the black level. System M has different blanking and black levels, on system J they're equal (see ). Systems J and M are often confused. Jaho (talk) 07:40, 6 December 2007 (UTC)
thread_title:  System J 

message: "(However, the choice of a 25 Hz frame rate has some unfortunate consequences for the telecasting of movies, most of which are filmed at a 24 Hz frame rate.)"
As I see it, the only unfortunate consequence for movies is that they run slightly faster and unless the soundtracks are digitally pitch-corrected they're about a semitone highter. But since the movies are screened at the same frame rate as video the motion appears perfectly smooth, as opposed to NTSC at 30 frames (OK, 29.97, whatever) where there's either motion judder or motion blurring except with modern equipment that can correct for them. Lee M 20:14, 4 Nov 2004 (UTC)
replies: text: It should be incorrect. Most TV sets either work at 50Hz or 60Hz framerate. 24/25/29.975 refers to the frames per second (framerate), as TV broadcasts are interlaced (each redraw is done two-pass: first pass for odd lines, second redraw for even lines). RAM 02:16, 24 August 2006 (UTC)
thread_title:  Frame rate 

message: I thought System I was 29.975-30fps. Can anyone check it out? My mom's a TV technician, and she once told me that PAL-I is 60Hz, which almost certainly means ~30fps interlaced. (Local TV stations here uses PAL-B/G, and she once modified an old PAL-B/G TV set so I could use a PAL-I game console on it).RAM 02:09, 24 August 2006 (UTC)
replies: text: There's no bloody way PAL-I works on 60hz!! ALL the countries it has been introduced [with the exception of Macau, maybe], use 230v AC supply, at 50hz. If we used a 60hz signal, it'd bust our tv's :S (158.125.9.4 01:41, 18 November 2006 (UTC)
replies: text: PAL-I is 50 Hz interlaced (25 fps). 100% definitely. Your mom's mixing it up with PAL-M or something. The mains frequency is irrelevant. Harumphy 11:47, 18 November 2006 (UTC)
replies: text: PAL-I has a different sound carrier, thats all. Its definately 25fps. --Kiand 08:09, 22 June 2007 (UTC)
replies: text: Probably mom (or you) is mixing up systems I and J. System I is 25 fps; system J is the 30 fps Japanese system, which is almost equal to system M (see the table in the article). Let me guess: was it a private import Japanese game console? Jaho (talk) 07:17, 6 December 2007 (UTC)

text: You are showing your ignorance of TV systems yet again.  The mains frequency is very important.  In the days of CRTs, the image was heavily distorted by stray magnetic fields from nearby motors, transformers, etc.  By chosing a field frequency the same as the mains frequency, the distortions, though present, would be stationary and relativley unnoticeable.  In most countries in the world (with the notable exception of those countries using system-M), the frame frequency is synchronised to the mains frequency. 86.182.66.217 (talk) 12:52, 21 May 2010 (UTC)
thread_title:  System I 

message: I have two questions, and they may be related....first, what does the chart mean by "b/w"...is it black and white? second, i think someone should mention the channel width for each system.... 
oh, and are there any multi-standard TVs that read both NTSC and PAL? (i know of SECAM/PAL TVs...)  The Legendary RaccoonFox • Talk • Stalk 20:35, 16 December 2006 (UTC)
replies: text: Most PAL/SECAM sets can easily be transferred between European countries, as you'd expect. Many of those countries also use the same broadcast system (i.e. B/G), so they can watch broadcasts regardless of colour format. (RM21 06:02, 19 December 2006 (UTC)
thread_title:  Channels 

message: This section concerns the explanation about frames. Scetpfe 16:58, 24 February 2007 (UTC)
replies: text: You are partially correct.  It wasn't only the 'hum' from the power supply that was the problem.  The picture was also distorted by stray magnetic fields from nearby motors, transformers, etc. directly deflecting the electron beam in the CRT. 86.182.66.217 (talk) 12:56, 21 May 2010 (UTC)
thread_title:  Frames 

message: This concerns "At the time television was developed, the vestigial sideband was easier to accomplish than true single-sideband modulation; with today's technology, there is no reason for it except to be compatible with existing technology" (end quote)
Actually, in the United States, digital television also uses amplitude modulation with a vestigial sideband scheme, although it's indeed much closer to true single-sideband operation than in the analog system.  It uses this not for compatabiity, but because filtering in the receiver would otherwise be prohibitively expensive.
Scetpfe 20:21, 24 February 2007 (UTC)
thread_title:  Modulation 

message: "Most commonly, the audio and video are combined at the transmitter before being presented to the antenna, ..."
I think this is more clear: "Most commonly, the audio transmitter output is combined with the video transmitter output before being presented to the antenna, ..." Scetpfe 20:26, 24 February 2007 (UTC)
thread_title:  Audio 

message: Please keep discussion in other section: this is for voting only.
* Analogue. Harumphy 09:10, 27 July 2007 (UTC)
thread_title:  Spelling:  Analog''ue'' or Analog: vote 

message: anyone want to include this image ?
http://en.wikipedia.org/wiki/Image:PAL-NTSC-SECAM.svg  —Preceding unsigned comment added by Machete97 (talk • contribs) 19:19, 22 May 2008 (UTC)
thread_title:  Map of BTS's 

message: Persons interested in this article's content may also be interested in joining the discussions at the new Broadcast Engineering and Technology Taskforce of WikiProject Television.  --tonsofpcs (Talk) 03:40, 19 July 2008 (UTC)
thread_title:  Broadcast Engineering and Technology Taskforce 

message: One addition to the following statement:
Most commonly, the audio and video are combined at the transmitter before being presented to the antenna, but in some cases separate aural and visual antennas can be used.
Well, separate antennas method must be a very old system. Being a man of profession, I have never seen such a system. In all modern analog transmitters video and audio are combined within the transmitter. But there are two methods of combining : Split sound refers to transmitters where the visual and aural RF are combined just before the antenna, intercarrier system refers to transmitters where they are combined in low power (ie which are usually called exciter) stages even before frequency conversion. Nedim Ardoğa (talk) 06:13, 13 October 2009 (UTC)
replies: text: Speaking for Europe, the picture and sound are broadcast on separate transmitters.  For the UK 625 line system, the sound carrier frequency is 6MHz higher than the vision frequency.  For pretty well the rest of Europe, the sound is 5.5MHz higher.  The 2 signals beat in the receiver to produce a sound signal that is the difference between the carriers known as the 'intercarrier frequency' which is extracted from the (picture) intermediate frequency amplifiers. 86.166.66.41 (talk) 18:15, 6 February 2011 (UTC)
thread_title:  Two systems in TV transmitters 

message: The article incorrectly states that U.S. digital cable television transmission standards are part of the ATSC's body of work.  Specifically, that article implies that the U.S. digital cable transmission standard is the same as the ATSC A/53 standard for digital terrestrial television in which the modulation technique has been modified from 8 VSB to QAM.  In fact, U.S. digital cable television transmissions are described by ANSI/SCTE 07 which is published by the Society of Cable Television Engineers.  While ANSI/SCTE 07 and ATSC/A53 share many similarities, they differ by more than just the modulation technique.  To my knowledge, neither standard even references the other one.  A proposal was put forth by the ATSC to use a modified version of A/53 with 16 VSB as the modulation method, but was rejected long ago by the cable television industry.  —Preceding unsigned comment added by 24.124.54.158 (talk) 02:37, 22 May 2011 (UTC)
thread_title:  ATSC/A53 vs. ANSI/SCTE 07 

message: The table of systems is now much too wide, and uses long-obsolete units of measurement to boot.  121a0012 (talk) 02:52, 7 December 2011 (UTC)
replies: text: The original units were supported by the reference I added, but since c/s = Hz I have changed the units to be more modern. Lmatt (talk) 04:20, 9 December 2011 (UTC)
thread_title:  Table of systems 

message: Did the Netherlands ever use the 819 line system ? Bar some early experiments with 567 lines they always used System B surely ? variants of the 819 line system were used in the French speaking part of Belgium. 90.213.194.155 (talk) 13:19, 27 October 2015 (UTC)
thread_title:  Netherlands 

message: "Colour broadcast of television systems" ?  I thought this was the English Wikipedia.  Could someone explain to me why this was thought a better title than "Broadcast television systems", which was less ambiguous and more in keeping with usual English syntax and the way this is discussed in grown-up publications. --Wtshymanski (talk) 21:13, 29 September 2016 (UTC)
thread_title: Terrible move

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message: There is a move discussion in progress on Talk:Mexican State Public Broadcasting System which affects this page. Please participate on that page and not in this talk page section. Thank you.  —RMCD bot 08:03, 19 March 2019 (UTC)
thread_title:  Move discussion in progress 

message: Could someone please add the aspect ratios to the big table? Thanks. ➧datumizer  ☎  19:11, 24 June 2020 (UTC)
thread_title:  Aspect ratio 

message: Is Mainland China is using system D on UHF like Australia or system K conjunction with system D? HarmonZach (talk) 12:43, 5 July 2023 (UTC)
thread_title:  UHF system D in Mainland China