diff options
Diffstat (limited to 'man/jack_iodelay.0')
| -rw-r--r-- | man/jack_iodelay.0 | 53 |
1 files changed, 0 insertions, 53 deletions
diff --git a/man/jack_iodelay.0 b/man/jack_iodelay.0 deleted file mode 100644 index 007e65a..0000000 --- a/man/jack_iodelay.0 +++ /dev/null @@ -1,53 +0,0 @@ -.TH JACK_IODELAY "1" "!DATE!" "!VERSION!" -.SH NAME -jack_iodelay \- JACK toolkit client to measure roundtrip latency -.SH SYNOPSIS -.B jack_iodelay -.SH DESCRIPTION -.B jack_iodelay -will create one input and one output port, and then -measures the latency (signal delay) between them. For this to work, -the output port must be connected to its input port. The measurement -is accurate to a resolution of greater than 1 sample. -.PP -The expected use is to connect jack_iodelay's output port to a -hardware playback port, then use a physical loopback cable from the -corresponding hardware output connector to an input connector, and to -connect that corresponding hardware capture port to jack_iodelay's -input port. This creates a roundtrip that goes through any -analog-to-digital or digital-converters that are present in the audio -hardware. -.PP -Although the hardware loopback latency is the expected use, it is also -possible to use jack_iodelay to measure the latency along any fully -connected signal path, such as those involving other JACK clients. -.PP -Once jack_iodelay completes its measurement it will print the total -latency it has detected. This will include the JACK period length in -addition to any other latency in the signal path. It will continue to -print the value every 0.5 seconds or so so that if you wish you can -vary aspects of the signal path to see their effect on the measured -latency. -.PP -If no incoming signal is detected from the input port, jack_iodelay -will print -.PP -\fT Signal below threshold... .\fR -.PP -every second until this changes (e.g. until you establish the correct connections). -.PP -To use the value measured by jack_iodelay with the -I and -O arguments -of a JACK backend (also called Input Latency and Output Latency in the -setup dialog of qjackctl), you must subtract the JACK period size from -the result. Then, if you believe that the latency is equally -distributed between the input and output parts of your audio hardware -(extremely likely), divide the result by two and use that for input -and/or output latency value. Doing this measurement will enable JACK -clients that use the JACK latency API to accurately position/delay -audio to keep signals synchronized even when there are inherent delays -in the end-to-end signal pathways. -.SH AUTHOR -Originally written in C++ by Fons Adriensen, ported to C by Torben Hohn. - - - |