| Products > Test Equipment |
| Test Equipment Anonymous (TEA) group therapy thread |
| << < (25090/27437) > >> |
| vk6zgo:
--- Quote from: Cerebus on July 05, 2022, 02:12:28 pm --- --- Quote from: BU508A on July 05, 2022, 01:47:50 pm ---Monochrome TV sets have a higher resolution than the colour ones. Here in Germany we are having a bandwidth for the black-and-white TV sets of 5MHz. For the colour ones (PAL) it is 4.43MHz. The difference goes into the vector encoding for the colours. --- End quote --- More than that in most analogue colour TV encoding schemes the chroma information is at half or less of the bandwidth of the luminance information. e.g. in PAL the colour burst has just enough bandwidth to set the colour for two adjacent pixels on the line (if you define pixel by the horizontal resolution of the luminance signal). This has carried over into some of the digital TV encoding schemes, which is why high quality black and white movies seem crisper than colour ones, because they are. --- End quote --- The human eye has better resolution for black & white than for colour, so the bandwidth of the luma image is designed to be considerably greater than the chroma information. There are diagrams showing the luma information up to 4.443 MHz, with chroma beyond that point. These do not show the full story, however, as looking at the video signal with a Spectrum Analyser reveals that the luma information appears as a number of carriers at multiples of the line frequency with upper & lower sidebands at multiples of field rate. Between these carriers, there are gaps' in the spectrum containing very little information. The Chroma carrier is offset so that its sidebands appear in these "gaps"---in effect, "frequency interlace". Early domestic Colour TVs could not distinguish between the two sets of signals in the Chroma region, because they used simple filters. Later designs used "comb filters" & could resolve the full luma spectra. |
| Cerebus:
--- Quote from: GreyWoolfe on July 06, 2022, 12:21:49 am ---Thankfully, I am not my pants either. I have forgotten my phone, keys, wallet, BT headset and pen but I haven't YET left the house without my pants. Yet. I hope that day never comes. :palm: --- End quote --- Why not? it's fun to go out without your pants. Ask any toddler. :-DD --- Quote ---My memory seems to be slipping more and more. Mrs GreyWoolfe thinks its the chemotherapy/fatigue from it that causes my memory issues. I will not disabuse her of that notion. --- End quote --- You aren't losing your marbles yet, it is the chemo. A friend has been complaining about getting "chemo brain" after his treatments but he bounces back to normal after a couple of weeks. |
| Cerebus:
--- Quote from: tggzzz on July 06, 2022, 12:30:09 am ---Just so. OSmaps show interesting features that you didn't know existed. VR stuff tends to have advertising features that you don't care exist. Plus black propaganda, fake news, and people/organisations flashing "look at me". No contest really. --- End quote --- You used to be able to get that just from a quiet stroll on Hampstead Heath. :-DD |
| tggzzz:
--- Quote from: bd139 on July 06, 2022, 08:48:51 am --- --- Quote from: tggzzz on July 06, 2022, 08:28:25 am --- --- Quote from: bd139 on July 06, 2022, 06:46:00 am ---Yeah there are some recent advances which pretty much make the paper maps a backup option only in the UK. It has got to the point where even on the mountain leader courses it’s secondary navigation only. The OSMaps app is a fine example. You have vector, 25k and 50k layers, full offline support, precise positioning and backtracking. Importantly it’s far more up to date than paper maps, particularly in areas with coastal erosion which change very rapidly. This all fits in a little box that lasts all day, is waterproof and takes photos too and works in the dark without having to shoot your adjusted eyes with a torch. And it syncs with the compass on your wrist to give you absolute bearings for each leg. Of course I have backup nav. I usually carry an eTrex 10 for backtracking and GPX plotting and paper map in bag. ... I’ll take the phone any day! It’s much better. --- End quote --- Yes, but in the UK it isn't illegal to sit in a stationary car and read a paper map. Touch a phone to do that and you've committed an offence which can get your driving licence revoked. Yes, I know it is more nuanced than that. The whole topic is subject for creative misinterpretation by drivers and the police :( Try to choose an alternative route on a satnav, and it is nearly impossible. The best route is what the manufacturer in their "wisdom" decides is the best route. Plenty of scope for arguments with daughter there :) --- End quote --- Full circle. Thanks to the ML processor on my phone I talk to it so I don’t have to touch it. And it works with alternative routes with trade offs and noticed traffic changes. --- End quote --- Traffic changes, sometimes but not always. How does it display multiple alternative routes and the tradeoffs? How do you tell it what tradeoffs you regard as important? --- Quote ---And the audio integrates with the car and the built in control stalks. --- End quote --- Ah yes, the old voice recognition trick in which you walk up to someone's computer and say "sudo rm -rf /" :( And they are saved by it autocorrupting it to "sugar rm -rf slash". |
| bd139:
--- Quote from: tggzzz on July 06, 2022, 09:23:38 am --- --- Quote from: bd139 on July 06, 2022, 08:48:51 am --- --- Quote from: tggzzz on July 06, 2022, 08:28:25 am --- --- Quote from: bd139 on July 06, 2022, 06:46:00 am ---Yeah there are some recent advances which pretty much make the paper maps a backup option only in the UK. It has got to the point where even on the mountain leader courses it’s secondary navigation only. The OSMaps app is a fine example. You have vector, 25k and 50k layers, full offline support, precise positioning and backtracking. Importantly it’s far more up to date than paper maps, particularly in areas with coastal erosion which change very rapidly. This all fits in a little box that lasts all day, is waterproof and takes photos too and works in the dark without having to shoot your adjusted eyes with a torch. And it syncs with the compass on your wrist to give you absolute bearings for each leg. Of course I have backup nav. I usually carry an eTrex 10 for backtracking and GPX plotting and paper map in bag. ... I’ll take the phone any day! It’s much better. --- End quote --- Yes, but in the UK it isn't illegal to sit in a stationary car and read a paper map. Touch a phone to do that and you've committed an offence which can get your driving licence revoked. Yes, I know it is more nuanced than that. The whole topic is subject for creative misinterpretation by drivers and the police :( Try to choose an alternative route on a satnav, and it is nearly impossible. The best route is what the manufacturer in their "wisdom" decides is the best route. Plenty of scope for arguments with daughter there :) --- End quote --- Full circle. Thanks to the ML processor on my phone I talk to it so I don’t have to touch it. And it works with alternative routes with trade offs and noticed traffic changes. --- End quote --- Traffic changes, sometimes but not always. How does it display multiple alternative routes and the tradeoffs? How do you tell it what tradeoffs you regard as important? --- Quote ---And the audio integrates with the car and the built in control stalks. --- End quote --- Ah yes, the old voice recognition trick in which you walk up to someone's computer and say "sudo rm -rf /" :( --- End quote --- You tell it what tradeoffs are important up front i.e. you don't want toll roads, don't like motorways etc. Then it remembers your preference. When you ask it to navigate to an address it gives you a shortest time and shortest distance option. When traffic changes it notifies you that it thinks it can save X minutes by rerouting and you can choose to accept it or decline it. As for the voice recognition it doesn't allow you to do anything destructive by design i.e. you can't incur cost or delete things with it. That's a manual process. It's very well engineered in that respect. I appreciate your cynical outlook on it. The ideas need testing. I am usually the first person to shred an idea that doesn't work or is stupid but these tools are significantly saving time, energy and cost or improving life in some way. Importantly they enable me to have more time to enjoy what I want to do. |
| Navigation |
| Message Index |
| Next page |
| Previous page |