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Understanding MP3 Encoding and Filter Banks in Audio Applications

Explore the application of filter banks and MP3 encoding in audio technology. Learn how MP3 utilizes human auditory system limitations to mask quantization noise, achieving compression while maintaining audio quality. Discover the basics of MPEG-1 or MPEG-2 Audio Layer 3 encoding and its benefits for audio compression. Compare the data rates of CD quality and MP3 to understand the efficiency of MP3 encoding. Understand the concepts of audibility threshold, frequency masking, and temporal masking in MP3 encoding.

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Understanding MP3 Encoding and Filter Banks in Audio Applications

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  1. Aplicações dos Bancos de Filtros CodificaçãoÁudio

  2. O Codificador MP3 • Codificação com perdas que tira partido das limitações do sistema auditivo humano para “esconder” o ruído de quantização • MPEG-1 ou MPEG-2 AudioLayer 3 (ou III) • MPEG: MovingPicturesExpertGroup • Compressão • CD 2 canais x 44100 amost./seg. 16bits=1 411kbps • MP3=128kbps

  3. Codificador MP3

  4. Limiar de Audição Não é necessário codificar esta componente

  5. Mascaramento na Frequência Não é necessário codificar esta componente

  6. Mascaramento no Tempo

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