【摘要】 调频同步广播系统可以节约频率资源,扩大覆盖区域,提高音频质量。2000年,我国公布实施《调频同步广播系统技术规范》(GY/T 154-2000),对"三同一保",即同频、同相、同调制度和保证一定的接收场强等技术参数作出规定。本文将PEAQ音频质量评价算法引入到调频同步广播建模中,考虑人耳感知特性和FM非线性解调的影响,对标准中技术参数重新进行评估。本文使用PEAQ算法输出的ODG等级来衡量输出音频的质量,给出调频同步广播关键参数的接收音频质量的相关曲线,从而得出调频同步广播的技术参数以及站点的设计依据。更多还原

【Abstract】 By FM sound sync-broadcasting system, the shortage of frequency resource could be ei ciently mitigateed to implement the biggest covering and improve audio quality. Technical Specification for FM Sound Sync-broadcasting System(GY/T 154-2000) was published in December 2000. In GY/T 154-2000, technical parameters of Three-Sameness and One-Guarantee(same frequaency, same phase, same modulation depth and certain i eld intensity) have been dei ned. This paper re-evaluates technical parameters in the standard with the radio equipment upgrading. The model of FM sound sync-broadcasting is based on the Perceptual Evaluation of Audio Quality(PEAQ) algorithm. The model considers the perceptive characteristic of the human ear and the inl uence of nonlinear FM demodulation. The paper uses Objective Dif erence Grade(ODG) to measure the quality of the output audio. Based on the same ef ect to listeners, the paper shows correlation curves about the audio quality of FM sound sync-broadcasting’s key parameters. At last, it puts forward techinical parameters of FM sound sync-broadcasting and the design principle of the transmitting station.更多还原