XPost: sci.electronics.basics
On Sat, 19 Nov 2011 10:16:43 GMT, spam@spam.com (Don Pearce) wrote:
>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.
Two walls of said cliff; multiple echoes. If you're on the edge of the cliff
with no opposing wall there will be zero echo.
>>> 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.
But you found it necessary to bring up loop gain. Interesting. You wouldn't
be an audiophool, by chance?
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