| 摘要 |
PURPOSE:To eliminate a impulsive noise and a synchronizing noise effectively with high S/N improvement and excellent sound quality characteristics, by providing a comb line filter having a broad pass band for a sound signal system. CONSTITUTION:The comb line filter 27 is provided at a post-stage of a detecting circuit 26 of a receiver 20. Filter characteristics of the comb line filter 27 are set to narrow band pass band characteristics by turning all switches 381- 38n on. In this case, since the pitch of a sound signal is converted into a prescribed value with a sound pitch converter 13 of a transmitter 10, the frequency pitch of the pass band of the comb line filter 27 is also matched to this prescribed value and the noise with respect to white noise is eliminated with the stop band. The impulsive noise is also eliminated by adopting the filter characteristics as eliminator characteristics. |
