I am still trying to figure out what TD is (Tracked Class D.)
Here's what LG says -
TD stands for “tracking class D,” which means that the power
supply tracks the audio signal at all frequencies, supply-
ing the required rail voltage while at the same time reserving
additional headroom. The high-speed switching principles of class D
are employed as well, though the final output stage remains a proven
class AB component. The entire audio path remains analog, with the
signal never converted to digital pulses and then filtered as in some
class D designs."
If the input signal is not converted to PCM, its not class D, as I understand class D. If it's a tracking amp, it's class H, but it seems to be a bit different than a class H amp. Which means I have no idea
If anyone has more specific information on their design, send me a message.
There's also the idea of using a switched mode power supply rather than a linear power supply. In one sense, this is the idea behind class D amps - to operate transistors as switched devices, rather than amplifiers.