Embedded information modulation and demodulation using spectrum control orthogonal filter banks

摘要

A method and apparatus for information embedding modulation and information extraction demodulation are presented which use analysis and/or synthesis filter banks. Spectral control of the form of the composite signals arising from the embedding of digital embedded information signals into digital host signals is provided. Various implementations, including cable head-end and user-end systems using such modulators are presented. One aspect of the modulator allows for reduced noise spillover into adjacent communication channels in a multi-channel communication system. In some implementations the analysis and the synthesis filter banks form perfect reconstruction filter sets. In other implementations, block transforms are used as the filter banks.