Patent ID: 6134267
Filing Date: 2000-10-17
Classification: H04H

Abstract:
A transmitter identification information (TII), in a Digital Audio Broadcast (DAB) stream, comprising the following steps:a) a differential demodulation of TII pairs included in a spectrum (S.sub.1 (.omega.)) of every other null symbol of the incoming stream (S1, S2, S3) to respectively obtain a demodulated null symbol spectrum (S4);b) correction of carrier phases of the demodulated null symbol spectrum (S4) with a TFPR phase reference symbol;c) determine a threshold (S7);d) decide if a carrier is set or not by comparing a carrier level to the threshold (S7) determined in step c); ande) detecting TII from said carriers having a level above said threshold (S7);further characterized in that said step a) comprises the following steps:a1) grouping pairs of frequencies, comprising a first frequency and a second frequency (S2); anda2) calculating a product of a complex amplitude of the first frequency with a conjugate complex of the second frequency (S2).