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???
09/10/07 21:26
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 		 #144341 - Who remembers log tables?
Responding to: ???'s previous message
Jan Waclawek said:
...if this range is not too wide, you can easily construct a table containing the inputs for particular outputs.

When I were a lad, we still had to learn to use log tables to do hard multiplications & divisions.

With Common logs (ie, to base 10), the integer part comes from the order of magnitude of the number, then you look up the rest in the log table - so the range of the input variables shouldn't really matter...



List of 30 messages in thread
TopicAuthorDate
1) Log computation, 2) LCD requirement            01/01/70 00:00      
   Yes            01/01/70 00:00      
      Why would you doubt it?            01/01/70 00:00      
      Yes            01/01/70 00:00      
         Doesn't have to be floating point            01/01/70 00:00      
            's the one            01/01/70 00:00      
               the good old Intel FP51 package            01/01/70 00:00      
         Should be in high level language, thanks..            01/01/70 00:00      
            you can steal it...            01/01/70 00:00      
               need floating-point log? - YES            01/01/70 00:00      
                  Fixed point ?            01/01/70 00:00      
                     RE: Fixed point ?            01/01/70 00:00      
                        And what is the input voltage range?            01/01/70 00:00      
                           RE: Aside: dB equivalent of voltage            01/01/70 00:00      
                              my point is...            01/01/70 00:00      
                                 Who remembers log tables?            01/01/70 00:00      
                              Already answered            01/01/70 00:00      
                        So use cB instead!            01/01/70 00:00      
                        Aside: dB equivalent of voltage            01/01/70 00:00      
   How to find log in assembly?            01/01/70 00:00      
      Hint            01/01/70 00:00      
      Math            01/01/70 00:00      
   Log calculation in ASM            01/01/70 00:00      
      Implementation and precision            01/01/70 00:00      
         Correct precision            01/01/70 00:00      
            Brilliant work            01/01/70 00:00      
               Absolutely!            01/01/70 00:00      
   Fixed-point log2, without lookup table.            01/01/70 00:00      
      To Mr Franck            01/01/70 00:00      
         Source for the algorithm.            01/01/70 00:00      

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