Originally Posted by oljim
Wtoc does have HD, all the prime time shows are in HD. I got my first HD tuner in 2003 and they had HD back then and still do.
How are you determing that they are actually transmitting HD, not ED or SD?
I just flashed my Hisense with an update that shows more info under diagnostics and I think it actually determines the amount of data in the stream, thus the format.
I have to wonder why they tag their transmission as DTV and not HD or SD as the other channels do.
Channel 35 I find to be a could comparison for HD vs. SD.
35.1 is the main and tagged as HD.
35.2 and 35.3 are SD. Quite often one of those two channels will carry the same show as 35.1 and if the show was recorded in HD you can see the difference by alternating the channel. My monitor is 1080i, the format that HD is, and my tuner will do that as well. No up conversion. I have not looked at other high end OTA tuners closely but do wish mine had a digital output of high quality. I would think that the input box on the Panasonic has good capabilities of taking the component (Y, Pr, Pb) and turning it into RGB for the screen.
Since you, Jim, have dabbled with this for some time, do you know how the digital signal is comprised or coded to carry the various parts of a picture. I fully understand analog and the stages of a receiver.
With analog, the tuned RF channel was sent to an IF stage of 3 and sometimes 4 stages of amplification. (the IF had to have a flat 4.5MHz band pass) Then the AM (picture) and FM (sound) were separated. Sync pulses were pulled and sent to the horizontal and vertical sweep circuits. The next stage separated the luminance (black and white) and the chroma signals. The chroma went to a demodulator with the 3.58 oscillator, synced as well, and turned the sideband signal into Pb and Pr components. So, at that point you have the Y,Pb,Pr components. The final stage being a mixer that turns those three components into RBG to fire the guns of the picture tube. (Often in the older sets there was a driver stage after the RGB separation.)
It is said that the Y,Pb,Pr signal was necessary to save on bandwidth, which is true for TV transmission, but not when interconnecting components such as a VCR or laser disc to the TV. It sort of makes me wonder why a manufacturer of such a components did not add Y, S-video, Y,Pb,Pr, or RGB jacks all at one time to their TV line, or jump straight to just the Y,Pb,Pr or for better still picture at slightly more cost the RGB. After decoding the analog tape or digital disc they were arriving at the Y,Pb,Pr signal. And the first ones that included an RF output had to convert that back to a luminance and chroma signal (S-Video), then combine them (Y, composite), mix in the audio, then send it through an RF modulator. A lot of unnecessary circuitry to achieve the poorest signal transfer. What I'm saying is that the Y,Pb,Pr inputs should have been installed on TV from very beginning of VCR or such. True they still would have to build in the RF modulator for a number of years to maintain backward compatibility, but they would have made the jump in one stage. Not eventually drop RF but still be stuck with composite and S-Video costs and poorer picture.
At least with computers and monitors they started with a RGB signal in the mainstream. (Some of those defunct systems started with using a TV as a monitor and it was quickly learned the quality of picture was bad.) A much faster transition from early consumer to fully digital than our TV system.
I wonder what will be next?