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Due to the demand of communication for medical implants with titanium housing, the introduced transceiver enables a simple and inexpensive, and power efficient solution with optimized modulation for high data rates at low frequency transmission.
In the paper a novel method for passive fractional delay filter design based on the distributed maximal flatness method is presented. The proposed approach is based on the design method of the one of the most commonly used fractional delay filters - the maximally flat filter. This filter demonstrates the excellent performance only in a relatively narrow frequency range around zero frequency but it...
In the paper, a novel implementation technique of orthogonal FIR systems is proposed. Starting from a state-space model of such a system, presented algorithm computes a fully pipeline structure consisting of Givens Rotations. This technique is illustrated by an FPGA hardware design example of a low-pass FIR filter.
In this work, the problem of constrained coil design is studied. Two approaches to this problem, namely the non-negative least squares method (NNLSQ) and the Tikhonov regularization technique, are compared. Several one-dimensional and two-dimensional examples are considered. It is shown that the constrained LSQ method outperforms the Tikhonov regularization based approach both in terms of the quality...
This paper describes the heuristic technique of analog filters design. After desired frequency response definition for a filter, the evolutionary system searches for adequate connections for its circuit. The circuit is constructed with the use of elementary blocks which contain two elements (resistance and reactance). The final values for all elements of the filter are searched locally by means of...
This paper presents results of studies on development of the system for testing of pseudo-random binary sequences produced by chaotic generators implemented in programmable devices. This task requires a large amount of computing resources due to the complex form of statistical tests. The proposed solution is a flexible, platform-independent integrated test-bed and can be extended by new modules. It...
The paper presents a method for design of LC cross-coupled oscillators based on an open loop technique and its practical application leading to a high frequency CMOS oscillator prototype. Thanks to the proposed approach, the main circuit parameters such as loaded quality factor (responsible for phase noise performance of LC oscillator) and steady-state oscillation amplitude, can be extracted without...
This paper presents a novel approach for the design of ring oscillators in a combined true random number generator (TRNG). We propose using delay elements made on carry4 primitives instead of series of inverters or latches in ring oscillators, which enables the construction of many high frequency ring oscillators with different nominal frequencies in the same field programmable gate array (FPGA)....
Paper presents a cost-efficient and convenient solution for computer-aided AC measurements that student can perform either in university lab or at home. A commercial audio codec chip with USB interface is used to design an oscilloscope and AC generator that may be used together with any personal computer without specific software drivers. This scope-generator is included into the new release of HomeLab-Kit...
This paper presents a time domain deconvolution algorithm. The operational principle and practical results from testing the algorithm on coaxial cable line and wireless communication channel is described. The simplicity of the algorithms usage is demonstrated and is based on the easy understanding of how to choose the algorithms parameters for applying it to time-base measurements data.
In this paper a method of DOA of a seismic wave using so called tri-axial geophone has been presented. The idea of the proposed method is to identify Rayleigh surface wave using simple inner products of appropriate signals. The great advantage of this method is its simplicity and ease of implementation in small DSP processors, application processors or even in microcontrollers, still retaining pretty...
The paper presents a systematic approach to synthesizing and implementing fast algorithms for computing the DCT of a power-of-two size. The main features of the obtainable algorithms are regularity of their signal flow graphs and low arithmetic complexity. Multiplierless implementation of the algorithms is based on the algebraic integer (AI) technique. A general AI encoding scheme for fast DCT algorithms...
The paper is a study of USB standard based on authors own concept of specialized digital architecture providing USB communication. Presented module connects peripheral device with a computer via USB cable. In accordance with functionality, the design was partitioned to three units. UTMI block deals with USB cable, time frame synchronization and serial transmission. PIE block, divided to two parts,...
In this paper, a parametric CORDIC IP is presented, implementing fixed point arithmetic (sine, cosine, and arctangent) trigonometric functions evaluation. The VHDL design uses parameters to define the bitwidth and the precision of the input and output signals. Important design options for hardware implementation include iterative, unrolled and unrolled pipelined architectures of the CORDIC module...
In this paper an efficient FPGA implementation of a packet pre-filtering algorithm based on Bloom filter is presented. In high speed link the traffic classification involves a very large amount of data per each packet processed (header and payload analysis). This leads to use hardware with high computational power and very expensive, in order to support requirement of real-time classification. Our...
In this paper a block-oriented approach for the susceptibility analysis of nonlinear analog circuits is proposed. Using a multi-input Wiener model the effects of interfering signals at an arbitrary circuit node can be examined. The proposed model separates the linear dynamic from the static nonlinear behaviour of the examined circuit. By this means, the frequency behaviour of the nominal and the interfering...
Vehicle classification based on their acoustic emission is a complex problem. Vehicle consist of many noise sources, and environmental noise can also be significant. The key to efficient vehicle classification is choosing the optimal feature extraction method. In this article three methods are presented, each relating to properties of vehicle noise. Methods are compared in context of their separability...
This paper presents the implementation on the FPGA module CABAC decoder for h.264. The organization of the computational process is based on the pipe-line architecture that allows to simultaneously decoding multiple bins. This scheme is implemented on FPGA with clock frequency equal 96MHz and provides decoding of one bin per cycle.
In this paper application of the mRMR (minimum Redundancy Maximum Relevance) algorithm to reduction of the number of lung sounds features used for asthma wheezes recognition is proposed. The paper presents the reduction of following features: Tonal Index (TI), Kurtosis (K), Energy Ratio (ER), correlation feature (CF1), Difference to Mean ratio (D2M), Eigen Value Decomposition feature (EVD), Linear...
The novel ideas for lossless audio coding analyzed in the paper are linked with forward predictor adaptation, and concern optimization of predictors on the basis of zero-order entropy and MMAE criterions, and context sound coding. Direct use of the former criterion is linked with exponential growth of optimization procedure, hence, a suboptimal algorithm having polynomial complexity is proposed. It...
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