Re: Invention?
I assume the synchronisation is the "invention".
However, "shall synchronize" is not an invention. Patents are about "how", not "what".
I am absolutely certain that there are several ways to do this.
And if either of them are claiming "synchronize clocks then distribute timestamps for points in the audio stream", then the patent must be invalidated because that is "bloody obvious to anyone vaguely aware of the art", let alone skilled.
Also SMPTE have published several standards for doing that since before Google was founded.