On 1/12/2017 2:13 PM, Jim Brown wrote:
>
Latency becomes an issue when main loudspeakers are 30+ feet over a
stage and further displaced side to side, and spill sound to the
stage, often in the range of 30-40 msec. This drives musicians nuts,
and is part of the reason large and complex stage monitor systems are
used. Performers hear themselves undelayed (or minimally delayed) at
levels higher than the leaked sound from the main system. Originally
this was done with big speakers on the stage floor; now it is far
more commonly done with miniature in-ear headphones connected to
stereo UHF receivers.
It's particularly acute with vocalists who need to sing *in time*
with the instrumentalists. Unfortunately, it is impossible when
using electronic instruments (guitars, keyboards, etc.) that have
no acoustic output! It is even worse for keyboard players, etc.
to press the key and hear no sound for 100 ms or more (think about
a CW keyer with the sidetone delayed by one dit time or more). Thus
the need for either "foldback" speakers on the stage or "in ear"
monitors.
For another worst case situation, consider the amateur vocalist asked
to sing the National Anthem at a NFL or MLB game. Without practice
and proper local monitor (foldback), it is totally impossible as the
spillover from the stands will completely kill the performance.
DSP can do some great things but it can often be like trying to keep
a symphony orchestra together when the members are spread from the 50
yard line around to the opposite 50 yard line and the percussion is
in the opposite end zone.
73,
... Joe, W4TV
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