| 摘要 |
<p>The present invention is related to head switching control apparatus for use in a magnetic tape recorder. Based on the technology, which is widely used for head switching control in analogue tape recorders and in particular in VHS video cassette recorders the present invention suggest a head switching control apparatus allowing a higher precision as it is required for digital tapes. The invention is applicable e.g. for tapes which are recorded according to the D-VHS standard. According to the invention the higher precision is achieved by adjusting the head switching pulse relative to the beginning of a certain data section of the digital data. In particular, the inventive apparatus comprises a digital data processing circuit for discriminating the beginning of said data section. A timer is started by the head-switching signal and stopped by the beginning of the data section to determine the time duration a head-switching signal precedes the beginning of the data section. The determined time duration is then used to calculate a second delay time. The second delay time allows achieving the required head switching precision for digital tapes.</p> |
