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The paper presents technical aspects related to the video computer analysis of people movement in the sales rooms. Automatic generation of the people density maps (also referred to as the “heat maps”) is helpful for the analysis of customers' and employees' behavior in sale and office rooms advertising effectiveness research or tracking movements. Generation of the density maps was realized with the...
In the paper technology and properties of the simple acoustic wave force sensor are presented. The sensor consists of LTCC (Low Temperature Co-fired Ceramic) cantilever with an active layer made of PZT (Lead Zirconate Titanate) tape with two IDTs (Inter-Digital Transducers). The cantilever dimensions of test samples are set to 25×8×0.5 mm3. The interdigital electrodes with designed line/space width...
In this paper, a complete architecture of the software defined radio receiver is proposed. First, a precise definition and the discussion of the problem is given. Next, an outline of the system topology is proposed, together with the requirements for each component of the system. Finally, a custom implementation is presented, including specifications, design considerations, and simulations.
An important feature of an iterative SVD algorithm is presented, which, under certain circumstances, makes real-time calculations of approximate independent components possible. Presented experiments show that for mixtures of signals with low SNR, the algorithm is an efficient ICA solution with low computational cost and acceptable quality.
This paper presents results of our research on automatic telephone call speaker recognition. A significant improvement of recognition quality can be observed if we use the knowledge on how the original speech was coded, e.g., using GSM or PCM telephone standard. On this basis we can improve the quality of the speaker models. In order to realize such a speech analyzer we propose to analyze the mean...
In this paper three illustrative full-custom baseband chips together with the respective testing methods and measuring setups are presented. The described circuits contain (among other elements) discrete-time switched-capacitor finite impulse response (SC FIR) filters. These filters operating in the baseband frequency range exhibit many important advantages such as low-power and high precision. As...
In this paper we present novel signal processing techniques for improvement of intelligibility of the so-called pseudowhisper, which is a kind of the residual speech, typical for the rest speaking abilities of a major part of the laryngectomized patients, i.e., of those, who went through the larynx (vocal cords) removal surgery. First of all we show how it is possible to suppress annoying vocal artifacts...
A non-destructive bunch length detector has been installed in the CLIC test facility (CTF3). Using a series of down-converting mixing stages and filters, the detector analyzes the power spectrum of the electromagnetic field picked-up by a single waveguide. This detector evolved from an earlier system which was regularly used for bunch length measurements in the previous CLIC test facility, namely...
This paper discusses an idea for power-saving mode in application specific processors in the domain of digital signal processing. This idea is based on a multiple (in practice double) accumulator model, which is used in order to obtain high accuracy in a series of floating-point additions. The goal is to introduce a possibility of reducing the power consumption without reducing the functionality....
In this paper we present four carefully selected computationally intensive signal processing problems, which can serve as benchmark applications for efficiency testing of modern DSP's, FASIC's, and PLD's.
A new proposal of a very long instruction word (VLIW) architecture for application specific processors with the built-in-self-repair (BISR) facility realized by means of the variable accuracy arithmetic has been described in this paper. The proposed idea, which is particularly interesting for the portable embedded systems, is based on a novel two accumulator model, which is used in order to obtain...
In this paper an algorithm for detection of endpoints of isolated words, which is a part of the automatic speech recognition (ASR) system, is presented. Our algorithm is based on the Legendre (slope) transformation. In order to analyze an influence of the proposed algorithm on the recognition effectiveness, a set of 10 Polish steering words was tested in two characteristic cases: recognition of original...
This paper discusses possibility of the use of PLD circuits to control switched capacitors (SC) structures. It is well known that several years the SC technique was introduced ago in order to replace resistors by simple configurations of a small capacitor with some switches, which (up to capacitance ratios) may be precisely realized in integrated circuits. The aim of the presented generator of programmable...
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