Re: [LAU] [LAD] Document on using Jack Apps

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
#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" was all that was
printed in my terminal.

You can find info here :
http://old.nabble.com/using-jdelay-td22843924.html
<http://old.nabble.com/using-jdelay-td22843924.html>
https://help.ubuntu.com/community/UbuntuStudio/FireWire_Recording in
Preconditions/measure your latency
http://wiki.linuxproaudio.org/index.php/Howto:latency_measurement

<http://wiki.linuxproaudio.org/index.php/Howto:latency_measurement>jy

2010/8/3 rob <rob@email-addr-hidden-egg.org>

> On 01/08/10 19:37, Arvind Venkatasubramanian wrote:
>
> Thanks to Julien and Rui Capela. Being a musician and engineer, this seems
> to be a great place to land in and learn new stuff in this world
> of Linux audio. Currently, I am still not able to find document that I need
> to solve 2 existing problems:
>
> *Question on using JDelay:*
>
> I have only one web source that has some details about using this tool:
>
> http://www.kokkinizita.net/linuxaudio/ and this reads: "It uses a
> phase measurements on a set of tones to measure the delay from the output to
> the input".
>
> How do I use these phase measurements and how do I pass in these tones?
> Are they special tones? What kind of oscillator do I need to use to
> generate these special tones? How do I pass in an audio tick or click? How
> do I do other settings?
>
> $ jack_delay -h --help does not show me the help menu
>
>
> http://wiki.linuxproaudio.org/index.php/Howto:latency_measurement
>
>
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user@email-addr-hidden
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>
>

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Received on Tue Aug 3 16:15:02 2010