H - Electricity – 03 – K
Patent
H - Electricity
03
K
328/88
H03K 7/00 (2006.01) G11B 20/14 (2006.01) H04L 7/033 (2006.01)
Patent
CA 1134462
3-1-1980 1 PHD 79-007 Device for synchronizing a clock pulse generator with a serial data signal. ABSTRACT. During the reading of serial data signals, for example, from a so-termed magnetic floppy disc, a synchroni- zed condition between the local oscillator of the reading device and the timing of the data stream must be reached as quickly as possible after the start of the read operation. When the initial synchronization has been reached, readjust- ment of phase and frequency may take place only slowly, be- cause the instants at which the actual signal transitions occur may exhibit a large spread with respect to the nomi- nal instants. Therefore, during a synchronization operation an element of a read clock pulse train is applied to the phase comparator at each status transition of the medium as well as at further instants. Furthermore, the data sample signal (control clock pulse train) of` the clock pulse gene- rator to be synchronized is applied at twice the bit fre- quency to the other input of the phase comparator. As a result, during the synchronization operation the phase com- parison is performed in a dense series, so that the low- pass filter connected to the output of the phase comparator may have a high cut-off frequency. Once the synchronization has been realized, the phase comparison is performed only once per data bit and, moreover, the low-pass filter is switched over to a lower cut-off frequency.
345697
Ginsberg Martin
Janak Miloslav
Reiners Albrecht
Ginsberg Martin
Janak Miloslav
Reiners Albrecht
Van Steinburg C.e.
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