| 摘要 |
FIELD: cabletelecasting. ^ SUBSTANCE: proposed local network 10 has subscriber leads 21 coupled with cabletelecasting head station 11 in desired carrier band. Network 10 also has noise suppression unit 21 whose input 24 is connected to leads 21 and output, to station 11. Unit 23 has band filters 28 - 31 connected to input 24 and using different passbands and transducers 32 - 35 designed for comparing output signal level of respective filter 28 - 31 with preset reference level and for feeding comparison result dependent logic signals to logic control unit 36 that functions to find out if these signals comply with conditions stored in unit 36 so as to convey control signal to unitized interlocking circuit 26 inserted in separate line 25 used to transfer signals from input 24 to output 27. Circuit 26 passes signals when logic signals received by unit 36 meet conditions stored therein. ^ EFFECT: provision for integrating interlocking means of noise-suppression unit in unitized interlocking circuit common for all carrier passbands. ^ 9 cl, 2 dwg |
