| 摘要 |
PURPOSE:To ensure the optimum signal identification through the simple circuit constitution and by the tentative decision with the filter which realizes the zero- cross and by the final signal identification through the matching filter. CONSTITUTION:The received signal supplied from input terminal 100 is devided into two parts to be supplied to receiving filters 1 and 2 each. The output of filter 1 is supplied to tentative deciding circuit 3, and circuit 3 receives the 1- or 0-decision to the sample value of the input signal. The output received the tentative decision at circuit 3 is supplied to desired received signal memory circuit 4. The final dicision result is also supplied to circuit 4 to be stored successively in two memory circuits 43 and 44. Circuits 43 and 44 deliver plural numbers of desired received signals and then supply them to vector distance calculating circuit 5. The output of filter 2 is supplied also to circuit 5, and the vector distance is calculated at calculating circuits 52 and 53 each. The outputs of circuits 52 and 53 are supplied to final decision circuit 6, and circuit 6 has a comparison of the level between the two inputs. And the final decision value is delivered to terminal 101 and also supplied to circuit 4. |
