ビット間隔の2階差分を利用した信号検出方式
1991 年 15 巻 55 号 p. 9-16
詳細
1991 年 15 巻 55 号 p. 9-16
In many digital VTR, play back signal is equalized to Nyquist's criterion, and detected to digital signal by integrated detection. We digitized play back signal after equalization with 4 times multiplied synchronous clock, and transfered these data to computer. Then we investigated the error occurring waveform and the number of errors. From this investigation, we developed new signal detection method using second difference between each bit. Threshold level is controled with the value of second difference as to increase signal to noise ratio. Detection errors near threshold level in integrated detection are extremely reduced and total error rate is decreased about 1/10.
