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Fracture_clinic View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fracture_clinic Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2020 at 1:48pm
Originally posted by fatfreddiescat fatfreddiescat wrote:

A really useful feature to look for is separate compressor and limiter on the outputs, so can set comp for thermal control and limiter for over excursion and clip prevention.



I thought too much compression raises RMS?
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JBK View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote JBK Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2020 at 3:33pm
It depends on the compressor, it's all about the time factor

https://en.wikipedia.org/wiki/Dynamic_range_compression#Peak_vs_RMS_sensing

peak compressor will activate instantly if the voltage gets above a certain threshold.
So yes continuous peak limiting = clipping = distortion and may lead to higher RMS value.

RMS compressor will compute RMS value over a period of time, and will lower the signal for a certain period of time if the computed value exceeds the threshold.

pseudo-RMS can be achieved with peak detection + long time constants (ie attack set  to the min, and release set to the max) but that's not an optimal method
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fracture_clinic Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2020 at 3:46pm
Originally posted by JBK JBK wrote:

It depends on the compressor, it's all about the time factor

https://en.wikipedia.org/wiki/Dynamic_range_compression#Peak_vs_RMS_sensing

peak compressor will activate instantly if the voltage gets above a certain threshold.
So yes continuous peak limiting = clipping = distortion and may lead to higher RMS value.

RMS compressor will compute RMS value over a period of time, and will lower the signal for a certain period of time if the computed value exceeds the threshold.

pseudo-RMS can be achieved with peak detection + long time constants (ie attack set  to the min, and release set to the max) but that's not an optimal method
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Ah nice one JBK, I'll do some more reading too. We often use the xca so I guess I should learn more about that compressor too.
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