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742207
Códecs
Description
Mind Map on Códecs, created by Ing William Alonso on 04/09/2014.
Mind Map by
Ing William Alonso
, updated more than 1 year ago
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Created by
Ing William Alonso
about 11 years ago
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Resource summary
Códecs
Convertir de ondas análogicas a digital.
Comprime secuencia de datos, permite reduccion de ecos
Waveform Algorithms
PCM (Modulación por impulsos codificados)
ADMPCM Adaptive Differential Pulse Code Modulation” (G.726)
Adaptativo: compresión automatica.
Diferencial: Cambio de codificación de muestras.
–G.711 rate: 64 kbps = (2 x 4 kHz) x 8 bits/sample –G.726 rate: 32 kbps = (2 x 4 kHz) x 4 bits/sample –G.726 rate: 24 kbps = (2 x 4 kHz) x 3 bits/sample –G.726 rate: 16 kbps = (2 x 4 kHz) x 2 bits/sample
CELP: Hybrid coding scheme. Alta Calidad de voz con bajos ancho de banda, uso de procesador intensivamente
G.728: LDCELP—16 kbps
G.729: CS-ACELP—8 kbps
G.729A variante—8 kbps, menos uso de procesador, permite mas canales de voz codificados por DSP
Anexo-B variante –VAD (detección de actividad de voz) and CNG (generador de ruido de confort)
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