Patent ID: 7046694
Filing Date: 2006-05-16
Classification: H04H,H04L

Abstract:
1. An in-band on-channel (IBOC) digital audio broadcast (DAB) communication system comprising: transmitting means for transmitting a composite signal including an analog FM signal, an upper sideband digital signal, and a lower sideband digital signal, wherein said sideband signals include source bit information which is duplicated in both upper and lower sidebands of a predetermined radio frequency (RF) mask and wherein the duplicated source bit information is encoded differently in the upper sideband than in the lower sideband; receiving means for receiving the composite signal; demodulation means for demodulating the received composite signal including the duplicated source bit information in both the upper and lower sidebands, with the differently encoded upper and lower sidebands with duplicated source bit information being demodulated by said demodulation means; determination means for determining whether the demodulated source bit information in the upper sideband or the lower sideband is less likely to be erroneous; and selection means for selecting the demodulated source bit information determined by said determination means as less likely to be erroneous without requiring prior knowledge as to which sideband is less likely to be deleteriously affected.