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Digital Audio Broadcasting

van Katjing Jan

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2021

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Vol. 25, No 3

315--328

EN

Processing digital radio - either on the transmitter or the receiver side - requires a significant amount of digital processing. A receiver for digital radio usually consists of two parts, a ”hardware” part, handling the conversion from an analog antenna signal to a stream samples, and a ”software part”, a decoder, decoding the samples and generating audio, text, images and video. In this paper some aspects of the design and implementation of Qt-DAB, a software decoder for Digital Audio Broadcasting (DAB and DAB+), is discussed. The Qt-DAB decoder runs on a variety of hardware platforms, hardware as small as creditcard sized computers as the Raspberry PI 2, and home computers. In the design performance and flexibility were key. The design is such that it is easy to interface to different hardware SDR devices and easy to add new features. While the core of the Qt-DAB software is formed by the signal processing part, interpreting the incoming sample stream and generating audio, text and images, by far the largest part of the software is handling user interaction and user comfort. Qt-DAB provides a large amount of options, options to select a device, to inspect the signal, to store signals, and options to set the configuration. All in all, it shows that about three quarters of the amount of code is involved is the non-signal processing part.

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Analiza możliwości wykorzystania bibliotek Qt w wybranych zagadnieniach komunikacji międzyprocesowej

Górniak Łukasz Janusz, Pańczyk Maciej

Journal of Computer Sciences Institute

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2017

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Vol. 5

213--219

PL

W artykule scharakteryzowano czym jest Qt. Przedstawiono przykładową implementację związaną z komunikacją międzyprocesową wykorzystującą pamięć współdzieloną w klasycznym problemie producenta i konsumenta. Takie rozwiązanie jest mile widziane przez programistów, którzy z różnych powodów piszą swoje programy stosując framework Qt w możliwie szerokim zakresie.

EN

This article illustrates what Qt is. An example of the producer-consumer problem implementation in interprocess communication based on the shared memory is presented. Such solution can simplify the process of building interprocess application for those who want to write their programs using Qt in all possible aspects.

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Human machine interface for piezo control system

Plewiński P., Makowski D., Mielczarek A., Napieralski A.

International Journal of Microelectronics and Computer Science

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2017

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Vol. 8, nr 4

155--160

EN

The increasing complexity of scientific experiments puts a large number of requirements on the systems, which need to control and monitor the hardware components required for the experiments. This article discusses three different technologies of developing Human Machine Interface (HMÏ) for the Piezo Control System (PCS) developed at the Lodz University of Technology (TUL). The purpose of the PCS system is compensating the detuning of a superconducting accelerating structure caused by the Lorentz force. A set of full-custom HMI operator interface was needed to operate the prototype device. In order to select the technology, which would best suit the requirements; the interface was designed and developed in native Qt, Qt Quick and EPICS. The comparison was made and their advantages and drawbacks are presented.

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The signal analysis of sound based on the application of guitar tabulatures for mobile devices

Solecki P., Zabierowski W.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 10b

239-242

EN

These The paper presents application for mobile devices which provides real time guitar tunning and analysis of tabulatures. This functionality requires algorithms to extract harmonic components of sound. This application is destinated for Symbian operating system with S60 interface. It consists of two important parts: application core created in Symbian C++ and user interface dedicated for Symbian Qt which provides support for this platform with integration to the S60 framework.

PL

Artykuł prezentuje aplikację przeznaczoną dla urządzeń mobilnych, która zapewnia strojenie gitary w czasie rzeczywistym oraz zapis tabulaturowy. Aplikacja przeznaczona jest dla systemu operacyjnego Symbian S60. Składa się z dwóch zasadniczych części: rdzenia aplikacji zrealizowanego w technologii Symbian C++ oraz interfejsu graficznego dedykowanego dla Symbian Qt, który zapewnia wsparcie dla tej platformy i integrację z frameworkiem S60. Narzędzie to przesuwa granicę zastosowań smartfonów i stanowi alternatywę dla komercyjnych stroików gitarowych.