Many articles have already been written on the topic of interface incompatibility.
But unfortunately, we don't always find the answer to the question we need. Namely, how to connect all the audio and TV devices in the house into a single electronic system?

In fact, there are many solutions to this problem, the simplest being manually switching cables from different sources to different consumers. But this method has a major drawback: over time, the connectors wear out from frequent switching on and off and require replacement.

We offer a universal microprocessor device - a matrix switcher. This device has X HDMI inputs and Y HDMI outputs. Using the buttons on the front panel or an infrared remote control, you can connect any of the X sources to any of the Y audio or video signal consumers. There's no need to sort out a tangled mess of cables: just connect them correctly once, and then enjoy.

An approximate connection diagram for the echo device is shown below. As we can see, there is nothing simpler.

But some will have a reasonable question: what to do with audio cables, both digital and analog, from the recent past.
I can answer this: if you have a favorite old amplifier, but which produces good power and very high-quality sound, then you should not throw it away. Of course, modern technologies imply the transmission and reception of sound via digital interfaces: coaxial RCA, optical TOSLink or universal HDMI. As a rule, modern audio sources and receivers are already equipped with HDMI interfaces, but if your device does not have this, then do not worry.
Nowadays there are many converters from analog interfaces to digital, as well as converters of various video interfaces. For example, let's say you have a standalone DVB-T2 digital tuner with HDMI output that receives terrestrial television at home. Next, you need to route the audio signal to your LCD TV and to a 5.1 analog home theater amplifier. Moreover, you also have a projector with an analog RGB input via a VGA cable and you want to watch football on the big screen and hear the roar of the stands through your home theater.

As easy as pie!
First, we split the signal into 2xHDMI and analog 5.1 using the HDCN0016M1 and HDV-912 devices, then we convert one of the HDMI interfaces into an analog VGA signal for the projector using HDV-M630. Now we connect the cables to the correct devices, tie them into a bundle using a cable organizer and enjoy high-quality video and sound!

P.S.
If you have more than one tuner or need to connect a DVD or Blueray player to this circuit, you will have to add a matrix switch HDMX0402M2, which was discussed at the beginning of the article.

Enjoy watching!