由于许多原因,声表面波滤波器在移动无线电设备中迄今还没有广泛地加以应用。本文简略概述接收机结构的历史发展,并介绍两种充分利用声表面波滤波器性能的接收机系统的设计:一个二次变频超外差便携式无线话接收机和一个同步播叫接收机。(paging,亦译作“呼寻”。这种接收机通常装在用户的衣袋里,当被呼寻时即自动发出音响信号,此信号因人而异,通知用户有人寻找,用户可就近打电话询问中心台何人何事找他——编者注)。在这些接收机系统中使用声表面波滤波器体现了在尺寸和功耗方面的优越性。 For many reasons, surface acoustic wave filters have not hitherto been widely used in mobile radio devices. This article gives a brief overview of the history of receiver architectures and introduces two receiver system designs that take full advantage of the performance of a surface acoustic wave filter: a secondary variable frequency super-heterodyne portable radio receiver and a synchronous broadcast receiver. (paging, also translated as “call seeking.” Such receivers are usually installed in the user’s pocket, when called automatically when the audible signal, the signal varies from person to person to inform the user looking for, the user can call nearby Ask the Central Desk where to find him - editor’s note). The use of surface acoustic wave filters in these receiver systems demonstrates the superiority in terms of size and power consumption.