Gentlemen,
Here is a link to their USA patent:
uspto.gov
The HFNRR review can be downloaded as a pdf here:
absolutesounds.com
Page 3 of the review has a box describing in very general terms how it operates. The patent includes considerable additional detail.
The patent describes the topology as being "Class AD." Since the great majority of the power to the load is supplied by the Class D section, I certainly don't think it would be correct to refer to it as being Class A in any sense other than the fact that the output voltage is controlled by a Class A circuit element (notwithstanding the fact that the Class A circuit element is connected directly to the output).
Perhaps all that can be said, IF Class AD is not a generally recognized term at this point (and I don't know whether it should be considered as such or not), is that it uses an output topology that encompasses both Class A and Class D circuit elements, that work in conjunction with one another.
Regards,
-- Al
Here is a link to their USA patent:
uspto.gov
The HFNRR review can be downloaded as a pdf here:
absolutesounds.com
Page 3 of the review has a box describing in very general terms how it operates. The patent includes considerable additional detail.
The patent describes the topology as being "Class AD." Since the great majority of the power to the load is supplied by the Class D section, I certainly don't think it would be correct to refer to it as being Class A in any sense other than the fact that the output voltage is controlled by a Class A circuit element (notwithstanding the fact that the Class A circuit element is connected directly to the output).
Perhaps all that can be said, IF Class AD is not a generally recognized term at this point (and I don't know whether it should be considered as such or not), is that it uses an output topology that encompasses both Class A and Class D circuit elements, that work in conjunction with one another.
Regards,
-- Al