Perceptual Coders
Mostrando 1-2 de 2 artigos, teses e dissertações.
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1. Study of the audio coding algorithm of the MPEG-4 AAC standard and comparison among implementations of modules of the algorithm
Audio coding is used to compress digital audio signals, thereby reducing the amount of bits needed to transmit or to store an audio signal. This is useful when network bandwidth or storage capacity is very limited. Audio compression algorithms are based on an encoding and decoding process. In the encoding step, the uncompressed audio signal is transformed in
Publicado em: 2007
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2. Um esquema de codificação adaptativa de imagens usando transformada cosseno discreta
Initial image coding studies with conventional VQ have shown some problems such as edge degradation and highly computational complexity. One new efficient method of adaptive coding using Fast Discrete Cosine Transform (FDCT) which reduces image compression rate is proposed. This method is based on composite source model, which helps in reduction of degradati
Publicado em: 2001