XPost: sci.electronics.basics   
   From: spam@spam.com   
      
   On Sat, 19 Nov 2011 20:22:43 +1100, "Trevor"  wrote:   
      
   >   
   >"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.   
   >   
      
   No they are not. One cliff, one echo. No choice.   
      
   >   
   >> 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.   
   >   
   In the context of the question it would simply be confusing to discuss   
   - or even mention - other kinds.   
   >   
   >>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.   
   >   
      
   Again, given the question, no need to complicate the answer.   
      
   d   
      
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