XPost: sci.electronics.basics   
   From: trevor@home.net   
      
   "Don Pearce"  wrote in message   
   news:4ec76c21.174471@news.eternal-september.org...   
   > On Fri, 18 Nov 2011 13:51:37 -0800 (PST), RichD   
   >  wrote:   
   >   
   >>What's the difference between reverb, echo,  and feedback?   
   >   
   > Echo is a single reflection of a sound - the kind you hear when you   
   > shout "Hello" near a cliff.   
      
   Multiple reflections are also common in such instances.   
      
      
   > Feedback is a situation you only get when you have an amplifier and a   
   > speaker. The sound arriving from the speaker is a little louder than   
   > the one that originally hit the microphone, so that comes out of the   
   > speaker a little louder still. This loop will build until the system   
   > howls.   
      
   That would be *acoustic feedback* only, There are MANY other types of   
   course.   
      
      
   >You cure it by turning down the amplifier so the sound from the   
   > speaker is always a little softer than the original when it hits the   
   > microphone.   
      
   Or any other method that reduces the loop gain at the feedback frequency,   
   notch filtering being a common example.   
      
   Trevor.   
      
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