Examples of Applications
MDC using Polyphase Transform
Proposed by W. Jiang and A. Ortega in [Jiang et al., 1999]
Q1 ... fine quantizer (primary part of information)
Q2 ... coarse quantizer (information of the other
channel in the case of loss)
-
both descriptions are received: x0 is reconstructed
using Q1-quantized information only (redundant Q2-quantized
data is discarded)
-
only one description is received: x1 (or x2)
is reconstructed using Q1-quantized data for the even-indexed
samples and Q1-quantized data for the odd-indexed
samples)
Optimal Bit Allocation (Amount of Redundancy)
r ... redundancy bit rate
R ... total bit rate
-
both descriptions will arrive with very high probability: r = 0
<==> Q2 = 0
-
one description will be lost with very high probability: r = 0.5
R <==> Q2 = Q1
==> 0 < r/R < 0.5 ... the
optimum rate is a function of the probability of packet losses
MDC using an Invertible Auditory Model
Proposed by G. Kubin and W.B. Kleijn in [Kubin et al., 1999]
MD Extension of Bell Labs Perceptual Audio Coder (PAC)
Proposed by R. Arean, J. Kovacevic and V.K. Goyal in [Arean et al., 1999]