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.

                                                   02/28/2014                                      JACK.SCOPE(1)