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    • 10. 发明授权
    • Acoustic surface wave filter devices
    • 声表面波滤波器
    • US4037181A
    • 1977-07-19
    • US666303
    • 1976-03-12
    • Hideharu IekiHideki IshiyamaAtushi Inoue
    • Hideharu IekiHideki IshiyamaAtushi Inoue
    • H03H9/02H03H9/64H01L41/04H03H9/26H03H9/32
    • H03H9/0296H03H9/64
    • An acoustic surface wave filter device for use in video IF stages in television receivers and the like, which comprises a substrate of a piezoelectric material and a spaced pair of transducers each of which is composed of a pair of interleaved comb type electrodes. One of the transducers is designed so as to have a frequency response curve in which attenuation poles at the both sides of the main lobe thereof, respectively, occur at frequencies corresponding to the upper adjacent-channel picture carrier frequency and the lower adjacent-channel sound carrier frequency. The other of the transducers is designed so as to have a frequency response curve in which the bandwidth thereof corresponds to the width from the sound carrier frequency of the associated channel to the lower adjacent-channel sound frequency. The substrate may be provided with a piezoelectric resonator. The substrate may be further provided with at least one ancillary transducing element. The acoustic surface wave filter device exhibits the desired overall response curve required for the video IF stages in television receivers and the like.
    • 一种用于电视接收机等的视频IF级的声表面波滤波器装置,其包括压电材料的基板和间隔开的一对换能器,每个换能器由一对交错的梳状电极组成。 换能器中的一个被设计成具有频率响应曲线,其中主波瓣两侧的衰减极分别出现在对应于上邻近通道图像载波频率和较低相邻声道声音的频率处 载波频率 换能器中的另一个被设计成具有频率响应曲线,其中其带宽对应于从相关通道的声音载波频率到较低相邻声道声音频率的宽度。 衬底可以设置有压电谐振器。 衬底可以进一步设置有至少一个辅助换能元件。 声表面波滤波器装置呈现电视接收机等中的视频IF级所需的期望的总体响应曲线。