| 摘要 |
PURPOSE:To eliminate mutual interference in a group operation of a sonar or the like by making a filter bank programmable corresponding to a delay element. CONSTITUTION:Output of a digital filter bank 1 comprising a BPF which filters a received signal based on a variable characteristic according to a program of a controller 5 for feeding a filter program is converted into energy with an energy detector 2. The energy converted is delayed with a delay element 3 and added and outputted with an adder 4. This can prevent mutual interference in a group operation of a sonar or the like over the same frequency range while enabling alteration of the service frequency range of a sonar or the like on a program of the controller 5. This also can eliminate a problem on aging of filter characteristic. |
