| 摘要 |
PURPOSE:To improve the detection characteristics, by providing a delay time difference between a video signal filter and an audio signal filter. CONSTITUTION:As a parallel stripe form electrodes for a surface acoustic wave device used for an intermediate frequency stage, a normal electrode having 56.5MHz of center frequency, 8.6mum wide, 15 pairs is used as the input electrode and a video output electrode and an audio output electrode are weighted electrodes changing electrode crossing width and interval in 60 pairs. The delay time of video signals determined from the distance between the center of the input electrode and the delay time of the video output electrode is delayed by about 50ns than that of the audio signals determined similarly. |
