Patent ID: 6154484
Filing Date: 2000-11-28
Classification: H04B

Abstract:
A method for transporting auxiliary information in subbands of a primary data signal, comprising the steps of:(a) modulating a pseudorandom noise carrier by said auxiliary information to provide a spread spectrum signal carrying said information on a carrier portion thereof in a plurality of subbands corresponding to said subbands of said primary data signal;(b) evaluating said primary data signal in said subbands thereof using time domain modeling to obtain an approximation of its spectral shape; and(c) using time domain synthesis which is responsive to said time domain modeling to provide the carrier portion of said spread spectrum signal in subbands thereof with a spectral shape which simulates the spectral shape of said primary data signal in the corresponding subbands thereof, thereby producing a noise signal containing said auxiliary information to be carried in said subbands of said primary data signal.