A modified real time dynamic spectrum adjustment scheme in FM IBOC broadcasting

Abstract

How to improve the quality of transmission and increase the speed of digital signal transmission is the inevitable trend of the research of digital broadcasting. IBOC (In-Band On-Channel) is the best choice of analog broadcasting to digital analog broadcasting simultaneously and to digital broadcasting. The real time dynamic spectrum adjustment technology is introduced into the IBOC broadcasting in this paper, the scheme is based on the dynamic spectrum IBOC scheme. Just according to the current frame and the existing audio quality, with the method of statistical analysis, the digital bandwidth of the current frame is adjusted by improving NMRref reference table, which can be adopted to solve the problem of time-varying interference between digital and analog signal. This algorithm uses the objective evaluation index based on perceptual evaluation of audio quality as the evaluation standard of audio quality and proposes an evaluation system suitable for this IBOC system project, which takes the time-varying noise and the subjective feelings into consideration. Finally, the ability of digital signal transmission will be enhanced, so as to realize real-time dynamic spectrum adjustment in real sense.