Browsing the [specifications for the IC-7300](https://www.icomjapan.com/lineup/products/IC-7300_USA/), I noticed it says the receiver system is a "Direct Sampling Superheterodyne" with an IF of 36 kHz.

I was confused by this, since I thought "direct sampling" means the received RF is amplified and filtered, but not mixed; and a superheterodyne employs a mixer. Thus a receiver can not be both direct sampling and superheterodyne. [NI seems to corroborate this understanding](https://www.ni.com/en-us/innovations/white-papers/18/advantages-of-direct-rf-sampling-architectures.html#section-1925642177).

So what is the IC-7300 architecture really, and what is a "Direct Sampling Superheterodyne" receiver?