Engineering Design NIDisk Guide de l'utilisateur télécharger pdf (Page 18)

DartDisk User Guide

A or P = acquisition or playback

nchan = number of channels

duration = recording duration in seconds

srate = sample rate in Hz

gain = gain in dB

filetype = file format ("s" = SIGNAL, "w" = Wave)

filename = filename or file prefix

chanform = [optional] file channel format

("s" = one file per channel, "m" = multi-channel file)

bdmodel = [optional] board model (44, 48 or 50) [default = 50]

Note: other program options are fixed in command line mode. Pre-existing data files of the

same name are overwritten. If the chanform argument is omitted, all channels are written to

one multi-channel datafile ("m" option).

Existing data files of the same name are automatically overwritten.

For example,

dartdisk a 2 60 50000 6 s myfile

will acquire two channels for 60 seconds at 50 kHz sample rate per channel with a gain of

6 dB, to SIGNAL-format sound files called myfile.1 and myfile.2, while

dartdisk p myfile

will play the sound file myfile.

If the filename or filename prefix (see "Acquisition Parameter Screen" above) includes

embedded spaces, enclose the entire name in quotation marks, for example:

dartdisk a 2 60 50000 6 s "\my project\myfile"

The optional parameter bdmodel specifies the base sample rate (in kHz) of the Dart model, if

different from the default 50 kHz. For example, the following performs the above acquisition

with a 44.1 kHz Dart model:

dartdisk a 2 60 50000 6 s myfile 44

Calling DartDisk from SIGNAL

DartDisk can be called from SIGNAL using the EXEC command. Include the full pathname

of the DartDisk executable, and enclose this in quotes if it contains embedded spaces, as in

the example below. Two applications are: 1) enclosing DartDisk in a SIGNAL program loop

to automate and time repetitive playbacks (using DOLOOP and TWAIT), and 2) using

TWAIT to run DartDisk at a particular time of day, for scheduled recording. The following

example (which should be presented on a single line) will perform the acquisition described

above:

EXEC "c:\Program Files\Engineering Design\Signal 4.0\dartdisk"

a 2 60 50000 6 s "\my project\myfile"

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 28 29

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Engineering Design NIDisk Guide de l'utilisateur Page 18