Mixed Signal Algorithm Tests Transducers - 04/24/97 EDN Design Idea A simple test procedure (Reference 1) allows you to measure
damping coefficient beta in electromechanical transducers, such as speakers, microphones, and seismic
geophones. The method is based on stimulating the transducer with a dc step current, IS, and then
separately integrating the positive and negative half-waves of the transducer's terminal voltage, V (t) ,
after removing the step current.… [by Alex Belousov, Rego Park, NY]
Model
fixed-point DSP arithmetic in C - 03/18/99 EDN
Design Idea (contains several designs, scroll to find this one) You can run initial high-level
simulations of custom numerical algorithms, such as digital filters, using floating-point numbers in an
environment such as C or Matlab. Unfortunately, you won't see include fixed-point effects, such as
truncation due to limited precision and register overflow, until you use a Hardware Design Language (HDL),
such as Verilog or VHDL. However, a technique that models these effects in C—the function "bit_limit" in
Listing 1—provides faster execution and better portability than HDLs and allows early exploration of the
trade-off between bus width and performance… [by Roger Maher, SSL Ltd, Dublin, Ireland]
Motor-Drive Algorithm Saves Space and Cycle - 02/17/94 EDN Design Idea The algorithm embodied in the second subroutine in Listing
1generates the excitation sequence for most permanent-magnet and hybrid stepper motors.This subroutine is
smaller than subroutines that spring from other algorithms… [by Jose A P Machado da Silva, University of
Porto, Porto, Portugal]
Numerical Integration Techniques TC7109 - Microchip Application Note Published 12-Nov-02 …
PIC µC implements CRC-16
algorithm - 02/18/99 EDN Design Idea (Collection
of Design Ideas, scroll to find this one) Detecting errors in serial data can be paramount in completing
an embedded-control design. Determining which algorithm to use for detecting serial-communications errors
depends on several factors. Ideally, the method should require minimal hardware and little computational
power from your processor and still provide high-level protection against undetected data errors… [by Lon
Glastner, Solutions Cubed, Chilo, CA]
Precision AC Peak Detector - This unique circuit uses a very inexpensive voltage comparator to form a peak detector.
The DC voltage produced tracks the positive peak of the input signal. It works from about ten millivolts
to about 10 volts peak to peak. The maximum frequency is about[. . . Circuit by Dave Johnson P.E.,
02/11/02]
Primer on binary
arithmetic rounding - 01/21/99 EDN Design Idea
(Page includes
several designs.Scroll to find this one)As digital communications and data
compression/decompression proliferate, signal-processing functions grow in importance. Whether you’re
dealing with hard-wired logic or pro… [by Tom Balph, Motorola SPS, Tempe, AZ]
Routine yields fast bit reversing for DSP algorithms - 09/13/01 EDN Design Idea If you need efficient real-time performance in DSP
applications, you need an efficient bit-reversing routine. For several FFT programs, data permutation can
take 10 to 50% of the computation time, depending on the input-data dimens… [by Mohammed Aziz, University
of Leeds, UK] |