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Start with the dictionary definition of "digital"

I looked it up in a few different dictionaries. The consensus is that in the context of signals and data, "digital" means representing a quantity as a series of numbers, presumably finite, usually but not necessarily binary numbers.

So in the case of pulse width modulation, if the pulse width is constrained to be one of a finite number of possible values, then it would be fair to call it a digital signal.

Once you low pass filter it after amplification by a high power switching output stage, the output at the binding posts is analog. Kind of like a R2R ladder DAC, which is why some people call this type of Class D amp a "power DAC".

J.Phelan has a point in that the amplifiers he mentioned are different from other Class D amplifiers having digital inputs (e.g. Tripath) which have a more conventional DAC followed by PWM formed in the analog domain.

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