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  • Summary of Data Acquisition responses

    As promised, the summary of the responses to our request for information
    regarding data acquisition follows:

    >> 12 November 1993

    >> Dear BIOMCH-L Readers,

    >> We are investigating the best way to set up a computerised data
    >> acquisition system for analogue data such as EMG, force transducers,
    >> potentiometers and so forth. One way would be to purchase a
    >> suitable A/D card and write appropriate software ourselves. Or we
    >> could purchase a commercially-available system.

    >> With respect to our interests, we would like to get the feedback
    >> of some of our more experienced colleagues regarding two questions:

    >> 1. We have some experience with Data Translation products, specific-
    >> ally the DT2801 A/D board. What are other laboratories employing,
    >> ie are there other alternatives and what are the pros and cons of
    >> these boards?

    >> 2. As far as commercially-available products for analogue data ac-
    >> quisition are concerned, what are the available products being
    >> used in laboratories and, if possible, whom can we contact to
    >> obtain more information?

    >> Thank you for your consideration. As usual, should we receive any
    >> responses which might benefit others, we will be happy to post a
    >> summary.

    >> Drew Smith PhD Elaine Aimone MSc

    >> A.T. Jousse Research Laboratory
    >> Lyndhurst Hospital
    >> 520 Sutherland Drive
    >> Toronto ONTARIO Canada
    >> M4G 3V9
    >> (416) 422-5551 ext 3041
    >> (416) 422-5216 FAX

    From: layne@plato.jsc.nasa.gov (Charles Layne)

    A.W. Smith

    You might be interested in contacting KISTLER INSTRUMENTS regarding a new
    product now known as the BPAS. If you are looking for a light-weight,
    portable device which can be used to collect EMG and a variety of analogue
    information using the same power and amplification hardware, this new
    product fits the bill.

    From: tsb@casbah.acns.nwu.edu (Tom Buchanan)

    A couple of comments/suggestions in response to your posting on BIOMCH-L.

    1) I believe that the right data acquisition hardware & software depends on
    your specific needs. From my experience, unless you have a very specialized
    application (e.g., very high sampling rates, 16 bit or higher resolution,
    or greater than 16 channels), most of the hardware can be used to get the
    job done. The difficulty is in the software.

    2) As for hardware, I am currently using National Instruments boards on
    Macintosh computers and have had good success with them. I've also used
    Keathly-Metrabyte boards on PCs without any problems.

    3) Software: We tend to write our own using drivers supplied by the
    manufacturers. However, one package we've used for some applications is
    National Instruments LabView (phone: 800-433-3488). It is based on an
    icon-driven programming language and is about as good as you can expect for
    an off-the-shelf product. I would take a look at it as it might meet your
    needs and is fairly easy to use. Also, it is available on several platforms
    (Mac, PC, SUN, etc.).

    I hope this helps.

    ************************************************** *********************
    Thomas S. Buchanan, Ph.D.
    Depts. of Physical Medicine & Rehabilitation and Biomedical Engineering
    Northwestern University Chicago, IL tsb@nwu.edu
    ************************************************** *********************

    From: MDTS000

    Hi Drew,

    Our Lab made good experiences with National Instrments boards. They can
    provide a wide choice of different boards for Mac, IBM, Sun and VXI. The
    offer include boards with D/A A/DE coversion, DMA-access boards, Digital
    I/O's and GP/IB interfaces. The boards all fit nice together. The
    support is pretty well and the customer services network worldwide.
    The software also offers a wide choice of drivers for all common
    languages (C, Pascal, Basic) and also high level software drivers. The
    most convenient but also most expensive solution is LabView, a graphical
    high level software language that allows signal processing, real time
    applications, etc.

    Order a catalog with a lot of helpful explinations: 800-433-3488

    Regards, Thomas Steffen MD, Orthopaedic Research Lab, RVH/McGill
    University, Montreal:Phone 514-842-1231 x 5276,
    e-mail: mdts@musica.mcgill.ca

    From: basdogan@seas.smu.edu (Cagatay Basdogan)

    Recently, GW Inst. came up with a new data aqcuisition software
    called "SuperScope II". Program is very user friendly and written in
    object oriented language. We use this program to acquire the kinematic
    data in our motion analysis studies. It is capable of digitizing 20
    channels with 100 Hz in continuous format (according to our configuration).
    However, you need to have the GWI's A/D board and multiplexer (if you want to
    digitize more than 16 channels).

    Here is the tel. number of GWI:
    Tel: 617 625 4096
    Fax: 617 625 1322

    Cagatay BASDOGAN
    Southern Methodist University
    Dallas, TX.

    From: Robert Newton

    Dear Drew,

    Concerning your question:

    > 2. As far as commercially-available products for analogue data ac-
    > quisition are concerned, what are the available products being
    > used in laboratories and, if possible, whom can we contact to
    > obtain more information?
    >
    We have purchased a system called AMLAB. It is basically a 486 PC with between
    4 and 32 medical quality amplifiers/AD modules. It allows the collection of
    just about any physiogical/biomechanical data. It accepts either AC or DC
    signals from an enormous range of transducers. To set up the data collection,
    analysis and display, you simply use a series of icons to draw the project you
    require e.g. there is an icon which represents a data channel you connect this
    to say a FFT icon, output this to a display icon for smoothed data and another
    for power spectrum and also output to a disk icon which saves the processed
    results.

    It is an excellent system especially if you have limited funds or limited
    technical support. If have one AMLAB system you can design a whole rnage of
    different projects so the system can be a force measurement system, an EMG
    system, a respiration/expired gas analysis system etc.

    We have 3 AMLABS now and I can highly recommend both the equipment and
    support. I am at home at the moment and do not have their address but if you
    want more information email me and I will send it to you.

    Regards
    ================================================== ======================
    Robert Newton Internet: rnewton@alsvid.une.edu.au
    Lecturer in Biomechanics Phone: +61 66 203762
    University of NewEngland, FAX: +61 66 203880
    Northern Rivers
    P.O. Box 157
    Lismore NSW AUSTRALIA
    -------------------------------------------------------------------------

    From: Young-Hoo Kwon

    Dear Drew:

    I have some experiences with the DT A/D board (more specifically, DT2801-A).
    Since I am writing a ground reaction analysis package (force-plate program)
    right now, I may say I am in the area where you are interested.

    1. So far I am pretty satisfied with DT 2801-A. Programming is very easy.
    Max. sampling rate of DT 2801-A is high enough for me. The only problem I have
    experienced is that the data array for DMA operation can not cross the physical
    64K boundary of the PC memory. I guess other products are the same in this
    matter.

    Upto this point,I have used Keithley MetraByte Dash-16 , PCL-718 and DT 2801-A
    , and all these products were pretty reliable. Programming is also very easy.
    MetraByte Dash-16 and PCL-718 have the same library structure, while DT 2801-A
    uses its own library functions. If you need any help in programming these
    boards, I will gladly share my experience with you.

    2. About the software:

    It is pretty difficult to have a general data acquisition software for EMG
    analysis and other data acquisition tasks all in one, I think. It is basically
    due to the difference in signal processing in these areas. For example, in
    the EMG analysis, the sequence of signal processing is:

    Collection -> rectification -> linear envelope -> time-reset integration or
    level-reset integration, phasic analysis

    In general data acquisition (in case using strain gauge, accelerometer, etc.)
    the sequence is:

    Collection -> linear envelope -> integration,etc.

    Upto this point, I have developed several data acquisition packages:

    KEMG: EMG analysis package written QuickBasic for MetraByte Dash-16
    + Ensemble average program
    KAcquis: General data acquisition program written in C for DT 2801-A
    Strain gauge , accelerometer, photocell, etc.
    KSPEED: Photocell application program written in C for DT 2801-A
    Measures interval times and speeds
    KGRF: Ground reaction force analysis program written in C for DT 2801-A

    KGRF is the one I am working on right now and is more general than others,
    since I expect to use other signal sorces such as photocell, strain gauge and
    accelerometer. The strategy to distinguish one type of signal source from
    another is to use the Channel Type flag. For example, 1 is force channel
    from the plate, 2 is center of pressure location, 0 is photocell, 3 to 9 are
    for other sensors. But I am not quite sure whether I will include the EMG
    channels here.

    Young-Hoo

    From:

    Hi Dr Drew,

    We are using LabView(commercial) package to collect data. It's very very easy
    to use. Please contact National Instruments Co. for details. The toll-free #
    is 1-800-433-3488.

    Good Luck,

    Bin XIA
    Room 10, Intramural Building
    Center for Locomotion Studies
    Penn State University

    From: D119MSS@UTARLG.UTA.EDU

    I have had extensive experinece with A/D conversion on a PC. I still prefer
    writting your own code for most flexibility and to elimnate software
    " black boxes." Attractive graphical front ends can be developed using
    interface routines available (e.g. Lab view by national instruments).
    As to board manufactures, try Computer boards, Inc. They produce
    a wide range of Metrabyte clones that work very well (fully software
    and hardware compatible) at about 1/2 the price.
    Hope this is helpful.
    -Michael Sacks

    From: BI_RSMITH@cchs.su.edu.au

    Drew,
    Hi there. You know our setup. DT2801 with either the ExpertVision ADS
    system or with ASYST or C programs. All the best.
    Richard

    From: Moshe Nissan

    Dear Elaine & Drew:

    We are using Apple Mac's in our lab. If you are too, I can recommend highly
    the MACADIOS and MACADIOS MANAGER by GW Instruments, from Somerville, MA
    02143. They have also an excellent SuperScope prog. which can solve much more
    then we needed.
    Hope will be of help. Moshe

    ********************************************!***** **********************
    * MOSHE NISSAN, PHD ! FAX: 972-4-552296 *
    * BIO-MEDICAL ENGINEER ! TEL: 972-4-295264 (WORK) *
    * Rappaport School of Medicine ! : 972-4-371788 (home) *
    * TECHNION - Israel Institute of Technology ! *
    * P.O.Box 9649, Haifa 31096, ISRAEL ! Bitnet: RPRNISN@TECHNION *
    ************************************************** **********************

    From: RICARDO@physocc.lan.mcgill.ca

    Have you seen the National Instrument catalogue 1994, they have very
    good ADC board and also software. How much would you be willing to
    spend. If you need more info on our equipment, write back

    Ricardo Torres-Moreno

    ----------------------------------------------
    Ricardo Torres-Moreno, Ph.D., Bioengineering
    Assistant Professor
    School of Physical and Occupational Therapy
    McGill University
    3630 Drummond Street
    Montreal, Quebec
    CANADA H3G 1Y5

    E-Mail : RICARDO@PHYSOCC.LAN.MCGILL.CA
    Phone : (514) 398-4521
    Fax : (514) 398-8193
    ----------------------------------------------


    From: INVX000

    In regard to your second question, you should look into a commercial sof
    tware package entitled LabView by General Intruments. This product is
    nothing short of spectacular. It smoothly and completely integrates all
    steps of the data acquisition and processing. I cannot begin to describe
    the flexibility of this product. I recommend that you send away for a
    demo disk. The only weakness of this software is that you must use cards
    specifically designed for it. However you should find these cards to mee
    t your biomechanics needs nicely.

    ************************************************** ********
    ************************************************** ********
    ** **
    ** Vassilis Vardaxis **
    ** McGill University, Physical Education Department **
    ** 475 Pine Ave, West, P.Q. H2W-1S4, Montreal CANADA **
    ** **
    ** Email: invx@musicb.mcgill.ca **
    ** Fax: (514) 398-4186, Phone: (514) 398-4186 **
    ** **
    ************************************************** ********
    ************************************************** ********

    From: kevin@biomed.QueensU.CA (Kevin Hood)

    Drew and Elaine:

    We are developing some hardware and software at the Biomedical Engineering
    Unit here at Queen's University that may be of interest to you. Our
    hardware APT box (Analog Preprocessor and Timer) is a custom box that has
    16 channels of analogue preprocessing including amplification, filtering
    (hi- and lo-pass), bin-integration and rectification (useful for measuring
    EMG envelope functions without having to sample at a high rate and software
    integrate), DC-offsets (the input signal can be DC-coupled). Each element
    is controlled from a host computer which talks to the APT through a standard
    RS-232 serial interface using a simple ASCII command language. In addition,
    a time-code (SMPTE - used for video) can be used to time-stamp the data so
    that if recorded to tape, on playback a given point in time can be located
    to 1/2400-th of a second. Using this time-code, we can also synchronize
    our analogue signals with video signals from video cameras, third-party
    motion-analysis systems (that provide external sync or that can sync to
    an external pulse) and other independently clocked systems that meet a few
    simple requirements (not normally restrictive from an acquisition point of
    view).

    The above is perhaps not fully clear but we could send you a brochure and
    some other documentation if interested. The APT will be transferred to
    a startup company in the new year for manufacturing and the price (not yet
    set) will be very competitive with the cost of implementing a similar system
    from other components.

    Simultaneously, we are developing software to run on a PC/Windows platform
    that would allow the APT to be used with other devices. Initially we will
    be supporting a DT-2821 series A/D card - indeed, we have provided a connector
    on the back of the APT to plug directly into this board. The software is
    made to be easily added to by users who may wish to write their own custom
    apps.

    If you are interested, I suggest that you contact me and I could answer any
    questions or send more information.

    Kevin Hood
    Biomedical Engineering Unit
    Queen's University,
    Kingston, Ontario, K7L 3N6


    ************************************************** ************************
    * Andrew (Drew) Smith, Ph.D. | INTERNET: awsmith@utcc.utoronto.ca *
    * Director of Research | BITNET: awsmith@utorgpu *
    * Lyndhurst Spinal Cord Centre | *
    * 520 Sutherland Drive | Home Address: *
    * Toronto ONT Canada M4G 3V9 | 33 Ponymill Drive *
    * (416) 422-5551 x3041,3040 | Scarborough ONT Canada M1V 2X9 *
    * (416) 422-5216 FAX | (416) 609-0469 *
    * "Damn the torpedoes....full steam ahead!" *
    ************************************************** ************************
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