If you are using a EWI 4000, you can trigger the EWI's audio output on
an oscilloscope on one channel, then attach the other channel to your PC
audio output. It should then be very easy to see the latency.
Brad
On 11/14/2015 12:19 PM, Ben Gonzales wrote:
Hi all.
How do you measure latency with a wind controller? I decided to try
the "record the actual sound and analyse" approach.
I tried using a mic next to the mouthpiece to record my "pfft"
(leaking out the side), and the synth-ed sound that followed. It was
difficult to distinguish the sounds. I then tried tapping with my free
hand on the recording PC's mic n sync with my "pfft", i.e. trying to
tap and blow at precisely the same time. After a bit of practice I
measured about 80ms delay.
Then I got a real recorder and a clarinet and did the same "tap and
blow". I got about 40ms for that.
I know it's not very scientific, but I concluded that the traditional
instruments have a delay before the sound is produced (maybe 40ms),
and my synth increases that delay by about another 40ms.
When I play the EWI, however, I can't say that I notice a delay. Maybe
it is because my brain is used to the inherent delay in the
traditional instruments???
So, some questions:
1. How does one measure latency for a wind controller?
2. Does anyone have a HOWTO for a low latency implementation on a R-Pi?
Ben
On 01/11/15 10:52, Peter Billam wrote:
...
I'm using a preempt-rt enabled kernel with hand-optimized IRQ
priorities and that gives me a latency (from key press to start
of sound) of about 12-15ms, which is acceptable.
On an ARM: yay! well done. At
http://www.pjb.com.au/midi/osdc/index.html#03
I reckon
About 10 milliseconds latency is acceptable. Of the linux synths,
TiMidity doesn't meet this; fluidsynth maybe just meets it,
on a fast CPU.
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