Isolation Ward

Your question has been answered over and over

71.112.95.63

In Reply to: RE: My question just below, seems to be one that nobody cares to answer! posted by clarkjohnsen on August 21, 2007 at 08:42:08

Howdy

You just have a world view (or a DAC view) that apparently prohibits you from understanding the answer. DAC chips don't make any assumptions about polarity nor do they flip or change polarity dynamically. Most have a positive and negative polarity output (i.e. a differential output) and a given digital input sample level will correspond to a well defined analog output level on these outputs. The input to DAC chips is a two's complement fixed point number and a positive input number will produce a analog positive output on the positive output pin.

You may know of DAC components or CD players which do "interesting" things when it comes to playing with polarity, but DAC chips don't.

-Ted

Follow Ups:

"DAC chips don't make any assumptions about polarity." Who said they did? - clarkjohnsen 12:05:16 09/05/07 (54)
- "Does your car turn left or right when you turn the steering wheel clockwise?" - Ted Smith 12:12:42 09/05/07 (53)
  - "Perhaps you didn't notice the post to which you were responding, or perhaps you didn't read it." LOL! - clarkjohnsen 12:24:02 09/05/07 (52)
    - ANSI/EIA 560-1990 - unclestu52 15:30:42 09/05/07 (48)
      - RE: ANSI/EIA 560-1990 - geoffkait 06:27:06 09/06/07 (47)
        
        "The Standard you reference is irrelevent." Quite right. Which is why it makes no sense... - clarkjohnsen 13:32:47 09/06/07 (29)
        
        May Well?? - rick_m 09:01:14 09/07/07 (27)
        
        " Please oh polarity guru, clear the air, we wait with bated breath." I see... - clarkjohnsen 09:09:35 09/07/07 (26)
        
        And I thought you wanted to teach. - rick_m 10:49:29 09/07/07 (24)
        
        "I was expecting you to help." And why do you suppose I've spent these hours with you... - clarkjohnsen 10:57:53 09/07/07 (23)
        
        Hey, my one liners to you are no worse than yours to myself and others. How does it feel? [nt] - Ted Smith 13:29:48 09/07/07 (2)
        
        Great, not to have to read another long, rather rude, and mistaken essay! (Since you asked...) nt - clarkjohnsen 11:00:44 09/08/07 (1)
        
        Same to ya buddy :) [nt] - Ted Smith 11:05:15 09/08/07 (0)
        
        RE: And guess what? - rick_m 12:28:35 09/07/07 (19)
        
        None of the above. - clarkjohnsen 10:40:48 09/08/07 (18)
        
        Sweet! I shall await the revelation with bated breath. -txt - rick_m 12:43:22 09/08/07 (17)
        
        I just told you the best part; have you no reaction? nt - clarkjohnsen 10:44:43 09/09/07 (16)
        
        RE: I just told you the best part; have you no reaction? nt - rick_m 13:00:37 09/09/07 (14)
        
        "My reaction to that is, which is right?" [Sigh] - clarkjohnsen 12:18:17 09/15/07 (13)
        
        Oh, right! - rick_m 14:41:10 09/15/07 (12)
        
        Indeed, but I'm looking for a way to make it more consistent. nt - clarkjohnsen 11:01:22 09/16/07 (7)
        
        Where are you looking? - rick_m 15:13:59 09/16/07 (6)
        
        Which standard should be THE standard? LOL! - clarkjohnsen 08:40:26 09/17/07 (5)
        
        LOL!!!!! - unclestu52 11:06:56 09/17/07 (0)
        
        RE: Which standard should be THE standard? LOL! - rick_m 09:36:48 09/17/07 (3)
        
        But what if they *like* rap? Then: Chinese and Japanese music? nt - clarkjohnsen 09:40:36 09/17/07 (2)
        
        Then we'd need to take it to the limit... - rick_m 10:02:28 09/17/07 (1)
        
        He's a heck of a lot easier listen than that Oriental droning. nt - clarkjohnsen 08:34:10 09/18/07 (0)
        
        That's where Clark's logic falls apart - unclestu52 15:16:54 09/15/07 (3)
        
        RE: That's where Clark's logic falls apart - rick_m 17:36:02 09/15/07 (2)
        
        RE: That's where Clark's logic falls apart - unclestu52 12:20:58 09/16/07 (1)
        
        RE: That's where Clark's logic falls apart - rick_m 15:03:26 09/16/07 (0)
        
        You answered only half - unclestu52 12:43:32 09/09/07 (0)
        
        Actually we hoped that you wanted to learn, but alas... [nt] - Ted Smith 10:21:47 09/07/07 (0)
        
        Wow! - unclestu52 14:51:55 09/06/07 (0)
        
        Standards - unclestu52 11:29:57 09/06/07 (16)
        
        RE: Standards - rick_m 12:26:22 09/06/07 (15)
        
        I'm game - unclestu52 14:36:55 09/06/07 (0)
        
        "As Clark would be quick to point out, may ALL be wrong." No, not quite. - clarkjohnsen 13:44:04 09/06/07 (13)
        
        You keep putting words in people's mouths - Ted Smith 15:42:06 09/06/07 (7)
        
        "Or you stand behind such flummery as..." - clarkjohnsen 09:05:34 09/07/07 (6)
        
        Maintaining polarity isn't a subjective question. - Ted Smith 10:19:15 09/07/07 (5)
        
        "All I have to do is use a scope with a well defined input." Unfortunately... - clarkjohnsen 10:48:20 09/07/07 (4)
        
        As I've mentioned over and over - Ted Smith 13:20:52 09/07/07 (2)
        
        "A CD with the correct polarity." No such animal! - clarkjohnsen 10:59:29 09/08/07 (1)
        
        "A CD with the correct polarity." Sure there is, the one that gets the result you want - Ted Smith 11:26:31 09/08/07 (0)
        
        The much maligned - unclestu52 11:27:37 09/07/07 (0)
        
        RE: "As Clark would be quick to point out, may ALL be wrong." No, not quite. - rick_m 14:25:50 09/06/07 (4)
        
        'I want my system to meet spec and blow when the data says to." Aha! - clarkjohnsen 08:36:44 09/07/07 (3)
        
        RE: 'I want my system to meet spec and blow when the data says to." Aha! - rick_m 09:59:55 09/07/07 (2)
        
        "making sure that the nominal polarity of my system is correct." [Sigh] And just how... - clarkjohnsen 10:31:14 09/07/07 (1)
        
        AES 26 - unclestu52 11:43:34 09/07/07 (0)
    - Pardon me, if you indeed read it you didn't understand it [nt] - Ted Smith 15:21:21 09/05/07 (2)
      - "It is industry standard to have non-inverted output," he wrote... - clarkjohnsen 10:16:28 09/06/07 (1)
        
        You're right - unclestu52 11:34:51 09/06/07 (0)

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