Delta operator filter structures have received interest due to good roundoff noise and coefficient sensitivity properties. However, it has been reported that delta realizations may produce limit cycles. In this paper, limit cycle problem in the direct form delta operator structure is studied by using a computer-aided test. The test determines exact amplitude and period of the maximum amplitude ...

Two xed-point optimization utility programs, the range estimator and the xed-point simulator, are developed for scaling and wordlength determination of digital signal processing algorithms written in C or C++ language. By exploiting the operator overloading characteristics of C++ language, range estimation and xed-point simulation can be conducted just by modifying the variable declaration of t...

This paper describes how to implement efficient FIR filters on ARM Cortex-M3 microprocessors. Two multiply-accumulate instructions are discussed: MLA – multiply with accumulate, using 32-bit operands and producing a 32-bit result, and SMLAL – signed multiply with accumulate, using 32-bit operands and producing a 64-bit result. There are advantages and disadvantages for each instruction. It is p...

In several practical settings we wish to communicate an identifier based on flashing lights. Examples hereof are the brain computer interface using steady state evoked potentials (SSVEP) and device identification using LED’s. The communication channels here use small alphabets, are error prone, unsynchronized, and require short code words. Nevertheless the number of identifiers is relatively la...

This paper describes the implementation of biorthogonal cosine-modulated filter banks on fixed-point arithmetic digital signal processors. The proposed implementation has the property that the overall filter bank keeps the perfect reconstruction property despite coefficient quantization, overflow, and rounding of intermediate results. The realization of the prototype filter is based on a factor...

-A new word-length optimization method based on Monte Carlo simulation is proposed. The wordlength of the check node extrinsic message is also further optimized in this paper. In the proposed optimization method, and in the process of optimizing the word-length of the channel data, the statistical distribution results of variable node’s posterior probability data and check node’s extrinsic mess...

The traditional lowpass Sigma-Delta (Σ∆) based Analog-to-Digital (A/D) conversion principle has been recently extended to bandpass for direct IF conversion. Such converter offers high Signal-to-Noise (SNR) ratios for narrowband signals relative to the sampling frequency, at significantly lower oversampling ratios in comparison to the conventional lowpass Σ∆ converters. In this paper a sixth-ord...

r proposes a new approach to the design ensional (2-D) innnite impulse response rs with nite precision coeecients. An function is proposed which combines mag-hase, step response and stability errors. tion being multidimensional and, in gen-convex is minimized using simulated an-evelopment of this method constitutes the n a feasibility study of the application of 2-rs to the processing of video ...