Temat: advanced audio coding

Skocz do pozycji: 1.

Tytuł:: Indywidualny sposób porozumiewania się jako narzędzie w procesie społecznego uczestnictwa osób o złożonych potrzebach komunikowania się
Autorzy:: Krasnostawska, Aleksandra
Tematy:: Kształcenie
Kompetencje komunikacyjne
Komunikacja interpersonalna
Advanced Audio Coding
Spektrum zaburzeń autystycznych
Porozumiewanie się; Pokaż więcej
Cytata wydawnicza:: Terapia Specjalna Dzieci i Dorosłych. 2024, nr 39, s. 6-13
Opis:: Artykuł z czasopisma "Terapia Specjalna Dzieci i Dorosłych".
Bibliografia na stronie 13.
Dostawca treści:: Bibliografia

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Skocz do pozycji: 2.

Tytuł:: Detection of Montage in Lossy Compressed Digital Audio Recordings
Autorzy:: Korycki, R.
Tematy:: tampering detection
digital forgeries
digital audio authenticity
lossy compression
frame offsets
modified discrete cosine transform
MDCT
advanced audio coding
AAC
ogg vorbis; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177075.pdf Link otwiera się w nowym oknie
Opis:: This paper addresses the problem of tampering detection and discusses methods used for authenticity analysis of digital audio recordings. Presented approach is based on frame offset measurement in audio files compressed and decoded by using perceptual audio coding algorithms which employ modified discrete cosine transform. The minimum values of total number of active MDCT coefficients occur for frame shifts equal to multiplications of applied window length. Any modification of audio file, including cutting off or pasting a part of audio recording causes a disturbance within this regularity. In this study the algorithm based on checking frame offset previously described in the literature is expanded by using each of four types of analysis windows commonly applied in the majority of MDCT based encoders. To enhance the robustness of the method additional histogram analysis is performed by detecting the presence of small value spectral components. Moreover, computation of maximum values of nonzero spectral coefficients is employed, which creates a gating function for the results obtained based on previous algorithm. This solution radically minimizes a number of false detections of forgeries. The influence of compression algorithms’ parameters on detection of forgeries is presented by applying AAC and Ogg Vorbis encoders as examples. The effectiveness of tampering detection algorithms proposed in this paper is tested on a predefined music database and compared graphically using ROC-like curves.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Performance Evaluation of Audio Coding by Amalgam AAC and FLAC Audio codec using MDCT and INTMDCT Algorithm
Autorzy:: Dhas, M. Davidson Kamala
Priyadharsini, R.
Tematy:: audio codec
advanced audio coding (AAC)
free lossless audio codec (FLAC)
modified discrete cosine transform (MDCT)
integer modified discrete cosine transform (IntMDCT)
mean opinion square (MOS)
perceptual evaluation audio quality (PEAQ); Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226258.pdf Link otwiera się w nowym oknie
Opis:: The MDCT and IntMDCT Algorithm is widely utilized is Audio coding. By lifting scheme or rounding operation IntegerMDCT is evolved from Modified Discrete Cosine Transform. This method acquire the properties of MDCT and contribute excelling invertiblity and good spectral mean. In this paper we discuss about the audio codec like AAC and FLAC using MDCT and Integer MDCT algorithm and to find which algorithm shows better Compression Ratio(CR). The confines of this task is to hybriding lossy and lossless audio codec with diminished bit rate but with finer sound quality. Certainly the quality of the audio is figure out by Subjective and Objective testing which is in terms of MOS (Mean opinion square), ABx and some of the hearing aid testing methodology like PEAQ (Perceptual Evaluation Audio Quality) and ODG (Objective Difference Grade)is followed. Execution measure, that is Compression Ratio(CR) and Sound Pressure Level (SPL) is approximated.
Dostawca treści:: Biblioteka Nauki

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