Advent huh? Nice idea but every time you open one of the engine doors you get a chocolate? (Scandinavian joke) As the name is a holiday here of sorts..its the count down to Christmas. But the engine idea seams good, all for improved engines, hope it don't also make it super fragile/delicate.

The J-58 used in the SR-71 mach 3 spyplane had a very similar arrangement, but for a different purpose. At subsonic and low supersonic speeds, all the compressor air went through the combustion chambers. At higher mach numbers, the bypass ducts were opened and some air bypassed the later stages of the compressor and the combustion chambers and was fed into the afterburner. That had the effect of turning the engine into a partial ramjet, which is more efficient at very high mach numbers than a turbojet.

Good to see a very obvious application being made reality...
Sorry, a Low Bypass Turbofan is still a turbofan. NOT a turbojet
I don't think there has been a single Turbojet used in any aircraft (at least in the aircraft we know about, and are told about) for a while now, they all appear to use turbofans....
J-58 = Turbo Ramjet
All (there may be an exception) US and European FighterJets use TurboFans (Sure Low bypass, but still described as such... Just Wikipedia it for goodness sake, it ain't too hard to get facts right.)
For Super cruise that thing called an afterburner is used..
Please PM me on information on any modern advanced aircraft using turbojets.
NOTE: Low-Bypass TurboFan =/ TurboJet, (Turbo Jet is a Zero-bypass Turbofan, but that is a paradox)

Their marketing department could use some extra funding, and, I got to say, the concept doesn't seem new. In fact, I think some of the European and Japanese companies or agencies have developed similar concepts,.. Though I have no citations to make.
Thing is, with recent studies in owl feathers, I am surprised I don't see any manufacturer developing something along these lines. After all, a noise reduction, is a drag reduction, which makes it a fuel efficient design. Engines could spin to higher rpm and the noise would definitely be suppressed by such design, rendering flight a bit less noisy even in turboprop designs... In theory anyway.

Bad news is the F-35 just doubled in price,again & again.

The idea of a veritable bypass turbofan engine is not new but the trick is to get it to work reliably.

GE designed an operational variable-cycle engine in the late 1980s for the program that led to the F22. I think it was called the GE YF120 and flew in both the YF22 and the YF23 black widow. Installed in the latter it was said to be very efficient and very fast.

The Chinese probably have a working model already.

Like someone mentioned, this process is a lot like what the Blackbird did several decades ago...except it used the ramjet process which made it go faster then this.
But regardless, I hope the engine works great during it's testing, and 10-15 years from now it might be a USAF 6 gen fighter.

Test in older Cold War jets: F14, F15, FA18. Be radical for Exec Jet use.