Wyniki wyszukiwania - BazTech

1

Low-Complexity DOA Estimation MethodBased on Joined Coprime Array

Salman Fatimah Abdulnabi, Sabbar Bayan Mahdi

Journal of Telecommunications and Information Technology

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2024

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nr 1

11--16

EN

In this article, the elimination of ambiguity of a joined coprime array has been examined, with a focus on such of its properties as large aperture size and complete degree of freedom (DOF). The existing methods suffer from a high degree of computation complexity due to the loss constant characteristic and high peak searching. Therefore, in this paper, a DOA estimation method for a jointed coprime array, characterized by a low degree of computational complexity, is proposed. The variance of the diagonal eigenvalues of the estimated covariance matrix is designed to enhance the accuracy of the covariance matrix of the joined coprime array. Then, the Capon beamforming methods is employed for peak searching. The simulation shows that the proposed method accomplishes accurate estimation with shorter computation times and fewer operations compared to other DOA estimation methods.

2

Low-cost Command-recognition Device

Hyben M., Hodoň M.

Przegląd Teleinformatyczny

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2013

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T. 1, Nr 3 (36)

19-28

EN

Speech recognition of nowadays has become a domain of computers and mobile devices with high computational performance, where the variety of applications is presented. However the problematic of speech recognition is still quite hard computational task for low cost and low performance microcontrollers. In this paper we propose an algorithm of command recognition system designed on FPGA that is ready for mass production together with low-cost microcontroller-based devices. These devices could cover a wide variety of applications, such as voice management of intelligent houses, voice-command applications, or simply just voice-controlled toys. The algorithm itself can be used as effective speech compression suitable for transmission to remote access point. Reduction of the amount of communication through communication channel also results in better power management.

PL

W dzisiejszych czasach rozpoznawanie mowy stało się domeną szeroko stosowanych komputerów i urządzeń mobilnych o dużej wydajności obliczeniowej. Problemem z rozpoznawaniem mowy jest jednak nadal dość trudne zadanie obliczeniowe dla tanich mikrokontrolerów o niskiej wydajności. W niniejszym artykule proponujemy algorytm systemu rozpoznawania komend zaprojektowany dla FPGA, który jest gotowy do masowej produkcji wraz z urządzeniami na bazie taniego mikrokontrolera. Urządzenia te mogą obejmować szeroki zakres zastosowań takich jak zarządzanie głosem aplikacjami w inteligentnym domu lub po prostu zabawki sterowane głosem. Sam algorytm może być stosowany jako skuteczny do kompresji mowy przy transmisji informacji do punktu dostępowego. Zmniejszenie liczby transmisji poprzez kanał komunikacyjny skutkuje również lepszym zarządzaniem energią.

3

Parametric Audio Based Decoder and Music Synthesizer for Mobile Applications

Szczerba M., Oomen W., Therssen D.

Archives of Acoustics

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2011

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Vol. 36, No. 2

461-478

EN

This paper reviews parametric audio coders and discusses novel technologies introduced in a low-complexity, low-power consumption audio decoder and music synthesizer platform developed by the authors. The decoder uses parametric coding scheme based on the MPEG-4 Parametric Audio standard. In order to keep the complexity low, most of the processing is performed in the parametric domain. This parametric processing includes pitch and tempo shifting, volume adjustment, selection of psychoacoustically relevant components for synthesis and stereo image creation. The decoder allows for good quality 44.1 kHz stereo audio streaming at 24 kbps. The synthesizer matches the audio quality of industry-standard samplebased synthesizers while using a twenty times smaller memory footprint soundbank. The presented decoder/synthesizer is designed for low-power mobile platforms and supports music streaming, ringtone synthesis, gaming and remixing applications.