ChemicalRob - 6 days ago »
So lowering the signal can increase the quality, by reducing the errors caused by "too high" a signal then.
I have to say I'm sceptical but I will connect my attenuator and give it a go.
Thanks.
Despite the digital TV label. Digital TV still uses a analogue sine wave carrier in the UHF band. A pure sine wave carries no audio or digital audio.
It has to be varied in some way. The receiver recreates the original pure sine wave in the opposite phase. Adding the two deletes the analogue carrier leaving just the modulated digital data.
If the sine wave amplitude is higher than the the tuner can cope with the positive and negative peaks of the carrier are chopped off basically with a fixed level. The resulting distortion creates the issue.
eg FM radio modifies the basic carrier by varying the frequency (Frequency modulation).
Life was much simpler when the presence or absence of the carrier meant that you had nothing or something. Hence long range Morse Code.
TV simply modulates the carrier with digital info.
Hence there is no such thing as a digital aerial. Everyone is designed to receive a UHF carrier in the case of TV.
| Thu 13 May 2021 21:35:52
#32 |