Ask two TVs to enjoy a set-top box!

No, the signal analyzed by the set-top box has only one channel, because before the set-top box analyzes (actually decodes audio and video signals) the signal, you must first select the frequency point of the channel you want to watch from the multiplexed signal according to the PID code (program code) and then solve it. Therefore, even if the signals analyzed by the set-top box can be processed, all rooms are on the same channel, so as long as the remote controller changes the channel of the set-top box, the programs in all rooms will be changed. The following are the relevant principles I answered before:

The local cable TV company makes all kinds of programs into transport streams (TS), scrambles them and sends them to you, then descrambles them and gives them to the set-top box. TS contains many programs, which is the channel we used to talk about. If you really choose different channels by frequency, then some people can say it, but cable digital TV is not like this. According to the program (channel) you choose to watch, the demodulator (tuner) in the set-top box will identify which station from the TS. According to the different PID codes sent by different stations, after distinguishing, the program is handed over to the decoding chip to decode the audio and video stream, and finally it is played on the TV through two wires connected to the TV. Of course, I won't elaborate on such professional things as channel compensation and demultiplexing.

If you don't understand, you can ask questions. Please advise if there are any mistakes.