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???
11/29/06 17:49
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 		 #128688 - sample rates!!!
Responding to: ???'s previous message
Russell Bull said:
What sample rate? As fast as possible! Usually 44KHz - there's plenty of memory in a PC, so we can afford to waste a bit.

Frequency wise, it is pretty accurate, amplitude wise, not very, but you can calibrate it. Don't expect to get perfect square waves - the inputs are usually capacitively coupled so you get parallogram waves rather than square waves displayed. Great for decoding infrared remote control signals and audio band signals.


Sampling a square wave at 44 kHz? Depending on the frequency of said square wave, you'll end up with a nice sine wave as the anti-aliasing filter does its thing.

At the very least, you'll end up with rounded edges.

A sound card isn't the right tool for looking at square waves.

-a




List of 41 messages in thread
TopicAuthorDate
PCA Problems            01/01/70 00:00      
   Problem or deisgn feature?            01/01/70 00:00      
      PCA upsetting Servo Ramp-up            01/01/70 00:00      
         How are you doing this?            01/01/70 00:00      
            more questions            01/01/70 00:00      
            How to connect Cool Edit            01/01/70 00:00      
               does not work            01/01/70 00:00      
                  Pulses generated ok            01/01/70 00:00      
            My Code            01/01/70 00:00      
               ther is your problem            01/01/70 00:00      
               Why are you...            01/01/70 00:00      
                  Assistance Please Russell            01/01/70 00:00      
               A suggestion            01/01/70 00:00      
   Minor Problem in Suggestion            01/01/70 00:00      
      I might have a guess            01/01/70 00:00      
      More comments            01/01/70 00:00      
         Thanks Eric n Russell            01/01/70 00:00      
            A two way street            01/01/70 00:00      
            Lost communication?            01/01/70 00:00      
            not a question of intelligence            01/01/70 00:00      
   This Code Works !            01/01/70 00:00      
      Much better with the comments!            01/01/70 00:00      
      explain a bit here            01/01/70 00:00      
      Moving in the positive            01/01/70 00:00      
         Russell you comment plz !            01/01/70 00:00      
            My comments            01/01/70 00:00      
               Guess you must be right !            01/01/70 00:00      
                  does not work !            01/01/70 00:00      
                     Make it work - thats your job!            01/01/70 00:00      
      Why disable interrupts            01/01/70 00:00      
         I thought the same about the interrupts            01/01/70 00:00      
      Cool Edit            01/01/70 00:00      
         re: Cool Edit            01/01/70 00:00      
            if not square waves - what did you get?            01/01/70 00:00      
               Cool Edit vs Digital Scope            01/01/70 00:00      
                  Cool edit            01/01/70 00:00      
                     Thank You !            01/01/70 00:00      
                     sample rates!!!            01/01/70 00:00      
   Will provide feedback            01/01/70 00:00      
   please help me about visisp52            01/01/70 00:00      
      discussed ad nauseam            01/01/70 00:00      

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