FREQUENCY DECIDING METHOD,申请号JP19990167191-传众专利搜索

FREQUENCY DECIDING METHOD

申请公布号：JP2000358078(A)

申请号：JP19990167191

申请日期：1999.06.14

申请公布日期：2000.12.26

申请人：

NEC CORP

发明人：ATSUTA HIROMI;SATO HIROYUKI;MORI MARIKO;HAGIWARA MASAYUKI

分类号：H04L27/14;(IPC1-7):H04L27/14

主分类号：H04L27/14

摘要：PROBLEM TO BE SOLVED: To accurately and speedily decide even a low sampling frequency when an FSK signal is converted from analog to digital and transmitted through a time-division time slot. SOLUTION: When a calculation period is judged from a peak level calculation period criterion, a peak level (Dp) is calculated and held in a storage means 1. When a linear PCM hold number is, for example, <=2576, peak level calculation is not performed and data input is expected. Then expected values at, for example, 1300 and 2100 Hz are calculated from linear PCM (Dn-1) right before the currently held level and stored in the storage means 1. The Dn-1 frequency decision result is fetched out of the storage means 1; and it is decided that the Dn frequency decision result is 1300 Hz when Dn is still in a prediction range of 1300 Hz, otherwise, 2100 Hz when in a prediction range of 2100 Hz, or it is decided that the last decision is held (1300 Hz) in neither case of the above.