[LAU] [LAD] Document on using Jack Apps

[Jean-Yves Poilleux]

Yes of course ! physical input/output should be patched. Thanks. How could
I've missed that !

Just to make sure : when you say that the following sentence is wrong :

"#3 : patch connections in jack : input -> jdelay, jdelay -> output, you should
get a tone in your speakers"

you were refering to the tone part, right ? you mean that physical
connections should ALSO be made, i guess. Because if there are no
connections in jack such as I discribed signal won't get in or out, and thus
Jdelay won't be able to calculate latency.


2010/8/3 Paul Davis <paul at linuxaudiosystems.com>

> On Tue, Aug 3, 2010 at 7:02 AM, Jean-Yves Poilleux <jypllx at gmail.com>
> wrote:
> > Hi
> > Actually, there is some info that can be found here and there on some
> forums
> > (see below)
> > JDelay is, from what I've understood, a command-line tool that allows you
> to
> > determine your sound card latency.
> > #1 : start jack
> > #2 : type jdelay in a terminal
> > #3 : patch connections in jack : input -> jdelay, jdelay -> output, you
> > should get a tone in your speakers
>
> this is totally and utterly wrong. you have to patch the PHYSICAL
> output connector of your soundcard to the PHYSICAL input of your
> soundcard.
>
> > #4 : latency is calculated, using phase difference between input and
> output
> > #5 : in the terminal, the latency is printed in msec.
> > It never worked on my soundcard, "signal below threshold"
>
> yes, because jdelay is sending a signal out of the soundcard expecting
> it to come back, but you have not connected it so that it can.
>
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