| 摘要 |
PURPOSE:To eliminate a disturbance wave by detecting an input signal while being separated into three band channels or over and turning off a switch of a channel in which an adjacent level difference of a detected value is larger than a prescribed value. CONSTITUTION:An input signal is inputted to a narrow band filter group 11. Part of outputs is selected by a filter selection circuit (MPX) 12 and inputted to a detection circuit 13. The circuit 12 decides a filter selected by a comparison discrimination circuit 15. The other output is inputted to a synthesizer 17 via a switch circuit 16. A detection signal from the circuit 13 is inputted to the circuit 15 through an integration circuit 14, the circuit 15 compares and discriminates an output energy of the filter group 11 to control the circuit 16. The circuit 16 turns on/off each switch in response to the control information obtained from the circuit 15. Outputs of the circuit 16 are synthesized by the synthesizer 17, resulting that a spread spectrum signal from which a disturbing wave is eliminated is obtained. |
