EdX

Codificación de audio: Más allá del MP3 (edX)

Codificación de audio: Más allá del MP3 (edX)

En este curso el alumno estudiará los fundamentos de los sistemas de compresión de audio así como los estándares más utilizados. Se verán los estándares del grupo MPEG como el MP3 y el AAC así como otros de código abierto como el OPUS.

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La Codificación de Audio (también conocida como compresión de audio) es una representación digital de las señales de sonido para ser almacenadas o transmitidas por cualquier medio digital. En este proceso se busca siempre ocupar el mínimo número de bits posible para poder transmitirla por canales limitados en velocidad o bien poder almacenar muchos sonidos o música en el menor espacio posible. Todo ello se debe realizar manteniendo una calidad de sonido cada vez más exigente y, en los últimos años, permitiendo sistemas más avanzados que el estéreo que proporcionan sonido espacial. En este curso veremos los estándares más conocidos, como el MP3, así como otros formatos superiores aparecidos en los últimos años.

Unidades:

Sección 1: Digitalización y compresión de audio, ¿cómo afecta a nuestra percepción?
Sección 2: Escalas auditivas y tipos de compresión
Sección 3: Estándares MPEG de compresión de audio
Sección 4: Codificadores avanzados de audio
Sección 5: Evaluación de codificadores

What you'll learn

  • Aprenderás los conceptos básicos de digitalización y almacenamiento de las señales y la capacidad de memoria necesaria.
  • Comprenderás el concepto de “tasa de compresión” y “velocidad binaria” (bitrate) de una coficación digital.
  • Estudiarás los mecanismos subjetivos de la percepción humana del sonido, sus limitaciones y el enmascaramiento que se produce en el oído.
  • Diferenciarás entre compresión con pérdidas y sin pérdidas.
  • Estudiarás los fundamentos básicos de la compresión con pérdidas a través de las diferentes capas del estándar MPEG hasta llegar al MP3.
  • Repasaremos estándares más avanzados que el MP3 como el MPEG-4 AAC y el OPUS.
  • Aprenderás a evaluar la calidad de un codificador con pérdidas a través de test “doble ciego” y MUSHRA
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