Load BIOPAC ACQ (AcqKnowledge for PC) data

Load BIOPAC's *.acq file (AcqKnowledge for Windows data format).

Description

"load_acq.m" will load BIOPAC's AcqKnowledge (ACQ) data to a structure containing ACQ header field and data matrix field.

It is based on Application Note #156 from BIOPAC web site (see attachment), and this version can support up to version 3.9.0 of AcqKnowledge that was released on February 23, 2007.

If "force_chan_by_chan_load" is set to 0, the program will read data depending on the data type in ACQ data. In that case, if the program detects that data type in ACQ file is different from channel to channel, it will have to read data "channel by channel"; otherwise, it will read the whole data in one block (6 times faster than using traditional way from channel to channel with the same result). However, by default, the "force_chan_by_chan_load" option will be set to 1, which means that it only reads data channel by channel if there is no option flag. This is because that we want to prevent out of memory problem when loading very large ACQ data file.

If the program detects that the ACQ data contains different sample dividers, it will have to read data "sample by sample" (very slow).

A script called "acq2mat.m" is provided to help you convert all .acq files to .mat files in all specified folders in advance, since to load corresponding .mat files will be much quicker.

i.e. In your MATLAB code, instead of using: acq = load_acq('MyGSR.acq'); you can now use: acq = load('MyGSR.mat');

• Acknowledgements: This submission has inspired the following:; ACQREAD
• MATLAB release: MATLAB 5.3.1 (R11.1)
• Other Files: acq2mat.m, ; app156.pdf, ; license.txt, ; load_acq.m

[Aida Jimenez-Gonzalez]

 

[boris fain]

Thank you, works great.

[Wojtek Grabski]

Works.

[Antonio Molins]

Did not work for me as provided, but worked with significant changes: halted before getting to the foreign data section (missed it by 2 bytes), and did not read markers and positions. A new version has been offered to the author, and is available on request.

[Alpesh Patel]