Harman's Real-Time Linear Smoothing/RLS for DAC (HD7725/HD-7725) still in use ?

[tiefbassuebertr]

Harman's Real-Time Linear Smoothing/RLS for DAC (HD7725/HD-7725) still in use on currently available Audio Components ?

While cleaning up I discovered the description of this (at those days) new technology in DAC's as a copy from the German magazine "Infosat", issue 60 published in March 1993 - see attached files.
Please note, the last both images shows the cover of this magazine as an example, bot not from issue 60.

Are there DA-converters from currently production, where this feature is integrated or is this technology vintage stuff resp. outdated technology ?

Thanks for advices.

 

[MarcelvdG]

I don't know about any recent commercial versions, but there may be some vague similarity to the unusual interpolation methods kokoriantz comes up with in the beginning of this thread: Analog Delta-Sigma interpolation DAC