Dars psf with no data rate increase

Abstract

A digital audio radio system that employs transmitting multiple time-separated versions or legs of the same or substantially the same source signal to accommodate signal blockage problems while using no or little additional bit data rate. In one embodiment, a first leg transmits only right channel data and a second leg transmits only left channel data when no blockage occurs, the two legs can be combined to provide a complete signal and perfect reception. If one of the legs is blocked, then a cloning technique is used to clone the existing channel as the non-existing channel to provide either a combination of two right channels or two left channels. In another embodiment, a first leg transmits a sequence of the even frames including both right and left channel data and leaves the odd frames blank, and a second leg transmits a sequence of the odd frames including both the right and left channel data and leaves the even frames blank. The combination of the two legs will provide perfect reception where no blockage occurs. If the signal is blocked, the existing frames can be repeated or interpolated to provide the non-existing frames. In another embodiment, a plurality of transmitted legs include blank frames and only right or left channel data in non-blank frames. The combination of all of the legs provides all of the digital data for perfect reception. If one or more of the legs is blocked, in the right and left channel cloning, frame repeating or interpolation can be used to replace the missing data in each frame.