In this paper we propose a model for a backwards-compatible subordinate audio channel within a host digital audio signal. Embedding and extraction methods are presented and objective-perceptual assessment results reported. The method is designed so as to minimize perceptual degradation to the host signal and maintain compatibility with existing systems. The implementations utilize the Discrete Cosine Transform and masking properties of the Human Auditory System. Performance evaluation is assessed using the objective-perceptual measure, Objective Difference Grade. Test results support that both the host and subordinate audio channels can maintain good audio fidelity without significant perceptual degradation.
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