I have an NX Mini (which isn't exactly the same as the regular NX line) which has a "1 inch" sensor and a 3-lens interchangeable system. With the 9mm fixed lens it's as pocketable as a phone, but with a flip-out screen, a real flash and otherwise much better quality. With the 9-27mm zoom lens it's even a reasonable portrait camera. I haven't found one of the 17mm f/1.8 lenses, they're pretty rare.
Anyway, I really like that little thing. With a C-mount lens adapter I can use surveillance camera lenses which is pretty fun.
Isn't Delta-Sigma and PDM exactly how DSD works? In fact, I think Sony originally came up with DSD as an intermediate representation of PCM in one of their DACs and then Sony & Phillips got the harebrained idea to use it in SACD. That is to say, a simple DAC for DSD is just a capacitor functioning as a low-pass filter, without any other components.
There's a long-standing convention of "golden age" meaning the first age, when an art came into its own. A "silver age" follows if there's a revolution in the art, often with some sort of decline between.