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 :
https://help.ubuntu.com/community/UbuntuStudio/FireWire_Recording in Preconditions/measure your latency
jy
2010/8/3 rob <rob@xxxxxxxxxxxxxxx>
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
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