ball_data*                             "data file name
128                                    "number of channels
13.8889                                "A/D sampling rate
3.5                                    "transducer center frequency
0                                      "block offset
52.488                                 "time offset
2048                                   "number of samples per record
2                                      "number of bytes per sample
16                                      "signal average
0.22                                   "element space in mm
1.48                                   "sound velocity in mm/usec