Reply to thread

Message

<blockquote data-quote="Robert Lofgren" data-source="post: 100874" data-attributes="member: 2447">Re: strange or not strange!Meters in almost any device have ballistics. In the case of mechanical vu-meters its mechanics can&#039;t cope with the fast changes of a true random signal. It has a rise and fall time lag.While a digital meter would be able to display the true level of a signal it would not make sense to a human eye. The leds would flicker like crazy and you would not be able to tell the actual levels. Therefor the digital meters somewhat emulates the mechanical properties of a mechanical vu-meter to make us humans comfortable to read the levels. There are several ways to do this.Depending on how metering data is sampled even a digital meter may be of by as much as 6dB! This is why you can find digital meters that are true-peak in some devices and daws that over-samples the signal to get a truer reading.According to the osc paper we can request metering data in 50mS intervals. It is resonable to think that the internal metering accesses the same mechanism internaly. According to the Berry tech guys the sampled metering data provided by the osc protocol is a current snapshot and not a sampled peak value over the 50mS period. The clip led light operates under different conditions and should alway be accurate.This makes sense for normal operation since we are not normaly concerned about 1dB accuracy but rather if we peg the meters to clipping or if we have enough headroom. Adding the final bits of accuracy require much more dsp power and memory and is a tradeoff for other functionality.</blockquote>

[QUOTE="Robert Lofgren, post: 100874, member: 2447"] Re: strange or not strange! Meters in almost any device have ballistics. In the case of mechanical vu-meters its mechanics can't cope with the fast changes of a true random signal. It has a rise and fall time lag. While a digital meter would be able to display the true level of a signal it would not make sense to a human eye. The leds would flicker like crazy and you would not be able to tell the actual levels. Therefor the digital meters somewhat emulates the mechanical properties of a mechanical vu-meter to make us humans comfortable to read the levels. There are several ways to do this. Depending on how metering data is sampled even a digital meter may be of by as much as 6dB! This is why you can find digital meters that are true-peak in some devices and daws that over-samples the signal to get a truer reading. According to the osc paper we can request metering data in 50mS intervals. It is resonable to think that the internal metering accesses the same mechanism internaly. According to the Berry tech guys the sampled metering data provided by the osc protocol is a current snapshot and not a sampled peak value over the 50mS period. The clip led light operates under different conditions and should alway be accurate. This makes sense for normal operation since we are not normaly concerned about 1dB accuracy but rather if we peg the meters to clipping or if we have enough headroom. Adding the final bits of accuracy require much more dsp power and memory and is a tradeoff for other functionality. [/QUOTE]

Verification