Traditional Intan Format - NeuroNexus SmartBox Instruction Manual

Traditional Intan File Format
This file format saves all types of waveforms (SmartLink amplifier channels, auxiliary channels from SmartLink headstages, headstage supply voltages,
SmartBox ADC inputs, and SmartBox
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nels of each type are saved. To keep individual file size reasonable, a new file is created every N minutes, where N is an integer that is specified by the
user. New filenames are created by appending a date and time stamp to a base filename provided by the user. Each file contains both a Standard Intan
RHD2000 Header and approximately N minutes of saved data. These .rhd data files may be read into MATLAB using read_Intan_RHD2000_file.m, which
is provided on the Intan Technologies web site.
This file format includes an option to save the temperature sensor readings from each SmartLink headstage attached to the SmartBox
Immediately following the Standard Intan RHD2000 Header in each data file is the waveform data. The traditional Intan file format saves waveforms in
"data blocks" corresponding to the Rhd2000DataBlock object in the C++ code. Each data block contains data from 60 amplifier samples.
Each data block is organized as follows:
DATA T YPE N AM E
60 x int32 Amplifier sample time index
For each enabled SmartLink amplifier channel, there are 60 ADC samples:
60 x int16 Electrode voltage
digital inputs) to one file, along with the Standard Intan RHD2000 Header described earlier. Only enabled chan-
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Sequential integers (e.g., 0, 1, 2, 3...) with zero marking the beginning of a
recording or a trigger point. Time indices can be negative to denote pre-
trigger times. Divide by the amplifier sampling rate (in Samples/s) to get a
time vector with units of seconds.
The use of an int32 data type means that this number will not "roll over" until
total recording times exceed 19.8 hours with the maximum sample rate of
30 kS/s, or 29.8 hours with a sample rate of 20 kS/s.
Units: ADC steps. To convert to electrode voltage in microvolts, first subtract
32768, then multiply by 0.195.
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APPENDIX B
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