Huron & SNAP Documentation

; comments
(
(dtype [bit16 | bit20 | bit24 | fixed | double] )
(mode [binary | text] )
(vsize integer)
(dmode [periodic | stream])
(struct [real | imaginary | complex])
[(samplerate longinteger)]
[(plotmax string)]
[(plotmin string)]
)
text or binary data ...
The SIM File Format
The format of the *.SIM file appears below. In general terms
the format of a *.SIM file is characterised by a header of control
information describing the type of data and its format, followed
by the actual data in a vector format. If the data contained in
the vectors is complex, the real and complex parts are
interleaved, sample by sample.
The control information in the header is made up of the
following components.
Component Description
Data type dtype set to bit16, bit20, bit24, fixed point or double
precision.
File mode mode is set to text or binary.
Vector size vsize set to length of vector.
Data mode dmode set to periodic or stream data.
Structure struct set to complex, real or imaginary.
Samplerate samplerate in Hertz [optional].
Plotmax/min string, generated internally by some Lake tools [optional].
Comments ; followed by comment to end of line.
Data Formats
The following points should be kept in mind when creating or
modifying a *.SIM file for use with Lake Technology software.
• Fixed point data is written as a 2's complement whole
integer. For example, a bit16 fixed point word would be
in the range from -32768 to 32767. Double precision
floating point can only be uniquely represented in binary,
and may give truncation errors when in text mode.
HURON TECHNICAL MANUAL PAGE 211