In Reply to: Which means: posted by Ralph on March 17, 2017 at 11:48:52:
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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Follow Ups
- Start with the dictionary definition of "digital" - Dave_K 09:59:54 03/18/17 (15)
- RE: Start with the dictionary definition of "digital" - Ralph 09:49:51 03/20/17 (12)
- RE: Start with the dictionary definition of "digital" - J. Phelan 10:01:15 03/20/17 (11)
- you would be incorrect about that - Ralph 10:47:25 03/20/17 (10)
- RE: you would be incorrect about that - J. Phelan 11:38:52 03/20/17 (9)
- Wow. Just wow. - Ralph 12:46:29 03/20/17 (8)
- RE: Wow. Just wow. - J. Phelan 14:23:18 03/20/17 (7)
- RE: Wow. Just wow. - Ralph 14:56:16 03/20/17 (6)
- RE: Wow. Just wow. - J. Phelan 17:24:37 03/20/17 (5)
- That's a good link - Ralph 08:38:29 03/21/17 (4)
- RE: That's a good link - J. Phelan 15:58:53 03/21/17 (3)
- RE: That's a good link - Ralph 10:06:59 03/22/17 (2)
- RE: That's a good link - J. Phelan 14:31:34 03/22/17 (1)
- RE: That's a good link - Ralph 15:16:38 03/22/17 (0)
- RE: Start with the dictionary definition of "digital" - J. Phelan 12:58:04 03/18/17 (1)
- RE: Start with the dictionary definition of "digital" - Ralph 09:37:31 03/20/17 (0)