Signal files usually have names of the form
`record.dat'. (The .dat
suffix is conventional, but
not required; any file name acceptable to the operating system is
permissible.) Signal files are binary, and usually contain either
16-bit amplitudes (format 16), pairs of 12-bit amplitudes bit-packed
into byte triplets (format 212), or 8-bit first differences (format 8).
(See `<ecg/db.h>' for information about other formats that are
supported.) The functions that read and write signal files perform
appropriate transformations so that the samples visible to the
application program are always amplitudes of type int
(at least
16 bits), regardless of the signal file format.
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