...Guys over the DIYaudio forum have once discussed building a DAC similar to Trinity (with time-staggered DACs).
In the thread
Building the ultimate NOS DAC using TDA1541A (DAC):
http://www.diyaudio.com/forums/digi...lding-ultimate-nos-dac-using-tda1541a-44.html
the OP in that thread posted the following explanation to what is happening inside such a dac, which in principle also describes what is happening inside the Trinity DAC:
"So the octal D-I DAC (octal D-I DAC is the name of their project - Adam.) can be compared with a single 19 bit DAC running at 352.8KHz sample rate. The higher sample frequency is obtained by adding delayed samples, resulting in frequency multiplication by 8. The linear interpolation is soly obtained by sequential adding/subtracting of DAC output currents, resulting in a higher resolution. Temporary storage of samples (memory) during generation of time delays is done in the serial shift register.
So the main advantage of the octal D-I DAC is obtaining a output signal similar to a 8X oversampling DAC (resolution and sample rate) without beeing one, as no digital interpolation filter or higher BCK clock frequency are used. This results in a excellent phase linearity over the entire audio range."
Their DAC didn't have any digital oversampling filter at all, so what they were getting was 352.8kHz virtual sample rate. Trinity DAC has an additional 8x digital oversampling filter, meaning the virtual sample rate is 352.8KHz x8 = 2.822MHz.