DIGITAL SIGNAL DETECTION SYSTEM

摘要

PURPOSE:To realize the direct detection of the signals by addressing the discrete Fourier conversion output value orthogonal component and then giving the access to the read-only memory into which the decision result is stored previously. CONSTITUTION:The orthogonal output component of discrete Fourier conversion DET is converted into the positive number through absolute value circuits 20 and 21. And the DET output x and y are converted into the parallel signals through serial-parallel converting shift registers 22 and 24 to give the access to read-only memories 23 and 25. In memories 23 and 25, 1 is stored in the corresponding address along with 0 stored in other address so that 1 may be delivered to inputs x and y to be regarded to decide the presence of the signals. Thus the signal detection completes just by referring to the storage value of memories 23 and 25. In this instance, the logic sum of the output of memories 23 and 25 is regarded as the genuine result of the signal detection for the x and y components.