| 摘要 |
A video disc has first and second information tracks adjacently formed thereon, and first and second FM signals with different frequency bands are recorded on the first and second information tracks, respectively. A common stylus simultaneously trance the first and second information tracks and a signal detector circuit coupled with the stylus detects the first and second FM signals. The first and second FM signals are separated by first and second filter circuits and applied respectively to first and second rectifying circuits, where DC voltage signals corresponding to the carrier levels of the detected first and second FM signals are produced.
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