[PD] 2009-2010 Macbook Pro 2.2GHz Latency?

chris clepper cgclepper at gmail.com
Fri Jul 27 17:58:39 CEST 2012

There's a threshold for distinguishing two discrete audio events of at
least 10ms or so, but that doesn't mean there are no audible artifacts
below that.  A flanger effect is between 1 and 10ms so low latency can give
a static 'hollow' comb filtered sound when the dry and processed sound are
mixed.  Whether or not one finds that sound objectionable is purely
subjective, but it has been known to affect artists enough that they can't
perform well.

Also, consider that sound travels about a foot a millisecond so standing 10
feet from a guitar amp means the sound is delayed 10ms.  I don't hear much
about this latency problem though.

On Fri, Jul 27, 2012 at 10:48 AM, Simon Iten <itensimon at gmail.com> wrote:

> Well from a musicians point of view (me) everything above 8ms is not very
> playable.  This is obvioulsy only true if the generated sound has instant
> attack, otherwise latency does not really matter :-)
>  On Jul 27, 2012 2:30 PM, "Charles Henry" <czhenry at gmail.com> wrote:
>> On Thu, Jul 26, 2012 at 8:50 PM, Tyler Leavitt <thecryoflove at gmail.com>
>> wrote:
>> > 10ms is around the human-ear latency, so anything at that level or below
>> > should be good enough for guitar/drumming (this is anectodtal... Iḿ not
>> sure
>> > the exact science behind it). Ive never had a problem with my friends
>> older
>> > 13" MacBook Pro used as a guitar FX box.
>> >
>> > Tyler
>> I believe the phenomenon you're describing is called "loudness
>> integration."  However, I can't find any good citations available on
>> the internet to back it up--here's something that *might* be
>> applicable:
>> Plack, C. J., & Moore, B. C. J. (1990). Temporal window shape as a
>> function of frequency and level. Journal of the Acoustical Society of
>> America, 87, 2178–2187.
>> The basic idea is that the cochlea is fed a series of waves and a
>> particular place on the basilar membrane resonates most for a given
>> frequency.  The instantaneous power delivered is low, so the power
>> needs to accumulate before the stimulus is strong enough to be
>> perceived.
>> As I recall, it takes about 20 ms to reach a steady state, but it's
>> been a while since I've read anything about it.
>> Chuck
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