Montreal, CanadaDigitizer maker Gage Applied Technologies is debuting FIR (finite impulse response) filters in FPGAs (field programmable gate arrays) in its line of 14-bit digitizers. The FIR filters let you filter digitized data in realtime. The user-customizable FIR filtering of voltage signals is a way to remove unwanted signal features (such as noise), while emphasizing signal features of interest.
Conventional analog filters are usually limited to rather simple filtering methods, such as low-pass filtering, high-pass filtering, or band-pass filtering. Now, however, numerical filtering of digitized waveform data lets you apply more complex filtering methods such as moving-average filters and Gaussian filters.
Optional FPGA Images
Gage's new FIR filters are available as optional FPGA images that can be installed on the 14-bit digitizers. The image supports FIR processing with up to 20 taps.
What's more, FIR filtering of digitized data is performed in realtime, during the transfer of data through one of Gage's cards to a host PC's PCI bus. The approach ensures that the analysis doesn't reduce the repetitive signal capture rate of the digitizer. Data is transparently filtered, with no processing required by the host PC's microprocessor.
The FIR filtering is also designed to be transparent to Gage's CompuScope drivers for Windows; again, no special software is required. In fact, the optional FIR filter technology can be implemented by existing Gage users on cards already in use in the field without requiring the card to be sent back to Gage to be re-programmed.
"You can implement it without disturbing an existing system setup," notes Gage general manager Eric Gillas. "And, additional application-specific FPGAs for custom on-board data analysis is already in the works here."
For further information, contact Marketing Manager Nicole Faubert at Gage Applied Technologies, 1 Provost, Suite 200, Lachine, QC, H8S 4H2, Canada.
Phone 800-567-GAGE, or (514) 633-7007 Ext. 3034. Fax: 1-800-780-8411. E-mail: firstname.lastname@example.org
Be sure to visit Gage's Web site for more details.