I tried to read the second patent but I had to give up half way through. It seems to be a description of some kind of demuxer.
If someone read that patent, understood it, stole the idea, and then reimplemented it I'd be very impressed.
I tried too and also got pretty confused but I think you're right.
It appears to me they're patenting some sort of device that takes multiple streams of data combined together, and then runs them through some sort of processor to manage and route them independently with regards to data communication and DSPs.
It sounds to me like they just patented the early soft-modem.
A bit of wikipedia/google lookup found two interesting facts.
1) Softmodems rose on the PC platform around 1997 when it became possible to use spare cycles from high end 486s to do the computation in place of dedicated modem CPUs.
2) In 1993, Apple released a Mac with a DSP onboard which was used as a coprocessor to handle misc signal processing. With that ability came the ability to turn your mac into a telephone, an answering machine, a fax machine, and a modem, and handle some other pro-audio tasks powered by the Mac itself. Essentially, the precursor to softmodems. And something like that would need to be able to distinguish between audio, fax, modem, and other data in some sort of software/hardware demuxer.
How that relates to the modern smartphone is not certain to me, but I'm guessing it might be related to how voice and data make it from the baseband to the CPU.
Suppose one smartphone has a baseband which sends serial data to the desktop like a traditional modem, and then has separate audio lines for voice.
Contrast this to a smartphone where the baseband which has some advanced data port which transfers control signals, modem data, and voice data all over the same port to the CPU?
Or something like that?
Like I said before, I get the idea, but I don't understand it's significance. And it's made harder by the fact that I don't really remember all the details of what tech was available when I was in middle school