What is PCM audio 

In my video on how to fix soundbar delay, I suggested to change your TV setting from Auto to PCM. I got a lot of comments on what is PCM audio. So, let's get started!
PMC stands for “pulse-code modulation.” The TV could be receiving audio signals from input devices such as Blu-ray players, game consoles, and set-top boxes. Or the TV could be sending audio signals to output devices such as speakers, soundbars, and headphones.
First let's look at input audio setting options for the TV. PCM only applies to the input audio devices that are connected using HDMI cable. If your input device has already processed the sound, and you want to hear the sound directly from your TV's speakers only, then select PCM option. When selecting PCM input, the TV changes the signal to 2.0 PCM. That means, if you then connect the TV to your sound system that is capable of multi-channel audio, it'll only receive 2 channel sound. In other words, don't select PCM input option, if you are planning to connect your TV to the sound systems with more than 2 channels. When selecting PCM, your TV won't need to process the audio, then you'll get a better quality audio through your TV's speakers.
Now, what is the best option if you're connecting your TV to an output device such as soundbar or home theater system. As a rule of thumb, don't select PCM if your output device has got more than 2 channels, for example 5.1 channels. PCM is uncompressed signal. Therefore, the signal needs to be compressed into Dolby digital or DTS first. That is why I said in my video on how to fix soundbar delay that if you're getting sound delays, use PCM because then the TV doesn't need to compress the signal before sending it to your soundbar and hence no delay. However, as many people commented, it is useless if you're connected to a sound system with more than 2 speakers! Also, if you're watching a program on TV that doesn't support Dolby digital or DTS, then selecting PCM could give you a better audio quality when connected to a soundbar.
I tried both PCM and Auto, and I couldn't notice much of a difference for my own system. But, based on the comments from other users, you might notice big improvement in your audio quality by using PCM. So, why not give it a try! Tip - After changing the settings on your TV or audio device, make sure to tun off and tun on the TV and the audio device to ensure changes to apply.
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