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Signal Files

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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George B. Moody (george@hstbme.mit.edu)