[Elecraft] Re: Microphone connections for K3 #1540

[Iain MacDonnell - K6IAM]

google is a wonderful tool...

http://www.doctorproaudio.com/doctor/temas/dynamics-processors-noisegates_en.shtml

"Downward expander. This type of unit works like the opposite of a 
compressor, and provides a "ratio" control or attenuation slope. That 
way the signal is attenuated more highly the lower the signal level is. 
In fact, if the threshold is set high enough, we could "expand" the 
dynamics of the signal, increasing its dynamic range, though this is not 
normally done. The attenuation ratio works in an equivalent way to that 
of the compressor, defining the amount of a attenuation (compression) 
that is applied to the signal. These ratios are expressed in dB, so 
that, for example, 1:6, means a signal that is 1 dB below the threshold 
will get reduced to 6 dB below it, while a signal  3 dB below the 
threshold will get reduced to 18 dB below it. Likewise, a 1:3 (one to 
three) means a signal 1 dB below the threshold will be attenuated 2 dB 
(as the level will go from -1 dB to -3 dB; we use a negative sign as 
these levels are below the threshold, which is the 0 dB reference in 
this case). With a ratio of 1:10 and higher, the expander is considered 
to work as a pure noise gate, though an ideal gate would have a 
theoretical ratio of 1:infinity (any level below the threshold would be 
totally muted). "

     ~Iain




Jim Wiley wrote on 09/ 1/08 11:16 AM:
> I give up. What is a "downward expander"?  It that the same as a 
> compressor?   Or is it something that has a "crossover point" that  has 
> one action on one side of the crossover, and  the opposite action  on 
> the other side?   All these newfangled  terms are  simply  amazing to us 
> OFs.
> 
> - Jim, KL7CC
> 
> 
> 
> Lyle Johnson wrote:
>>
>> An experimental Downward Expander will be available in the K3 firmware 
>> in the near future.  It has been undergoing some limited testing already
>>
>> _
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