NAME¶
jack.scope - JACK Oscilloscope
SYNOPSIS¶
jack.scope [options]
OPTIONS¶
-b : Set the frame size of the data displayed by the scope (default=512).
-d : Set the delay interval in milli-seconds between scope updates
(default=100.0).
-f : Request that a still image file of each frame be stored to the
indicated directory.
-m : Set the scope operating mode (default=signal). The operating modes
are: signal and embed.
-n : Set the number of channels, and therefore the number of JACK input
ports (default=1). Multiple channels are superimposed, each channel is drawn
in a distinct color. There is a compile time channel limit.
-p : Set the port number to listen for OSC packets on (default=57140).
-w : Set the scope size in pixels (default=512). The scope window is
square.
DESCRIPTION¶
jack.scope is an oscilloscope for JACK under X11. jack.scope draws either a time
domain signal trace or a self correlation trace. Multiple input channels are
superimposed, each channel is drawn in a different color. jack.scope accepts
OSC packets for interactive control of drawing parameters.
The operating mode of jack.scope is set using
-m. In signal mode
jack.scope draws a time domain signal trace, in embed mode jack.scope draws a
self correlation trace.
The size of the jack.scope window is set using
-w, the scope window is
square. The window is of fixed size and has centered gravity. The time
interval that is displayed is determined by the frame size, set using
-b. The image refresh rate is determined by the delay interval, set
using
-d. Note that the interval is truncated to the nearest frame
boundary and that the time taken to compose the image and blit to the screen
is indeterminate.
The number of JACK input ports that jack.scope creates and monitors is set using
-n. Multiple channels are drawn in superimposition, each channel is
drawn in a distinct color.
In signal mode the trace is drawn in a style set using
/style. In dot
mode only the sample pixel in each column is drawn. In fill mode all pixels
between the sample pixel and the zero pixel of each column are drawn. In line
mode all pixels between the adjacent sample pixels of each column are drawn.
In embed mode the trace is a self correlation signal with a sample delay set
using
/embed. The delayed sample is on the x-axis. The interpolation
increment is set using
/incr, increment values less than one result in
increasingly continuous trace paths.
jack.scope can store the animation as a sequence of uncompressed
ppm(5) image
files. To request this use the
-f option with the directory files
should be written to as the argument.
The OSC messages understood by jack.scope are given in the table below. Each
command requires one argument of the indicated type. The last column gives the
option that sets the same parameter.
Command Description Argument Option ------- ----------- -------- ------ /mode
drawing-mode string -m /style style string N/A /frames frame-size integer -b
/delay refresh-interval float -d /embed embedding integer N/A /incr increment
float N/A
jack.scope implements no connection logic, use
jack.plumbing(1) instead.
REFERENCES¶
Monro, G. and Pressing, J. ‘‘Sound Visualization Using Embedding:
The Art and Science of Auditory Autocorrelation’’ CMJ, 22/2, 1998.
AUTHOR¶
Rohan Drape
http://slavepianos.org/rd/
SEE ALSO¶
jackd(1), X(7x), OSC(7)
http://opensoundcontrol.org/
AUTHOR¶
Rohan Drape <rd@slavepianos.org>
Author.