Digital magnetic recording and reproducing device

Abstract

Abstract PURPOSE:To prevent the command of head cleaning or the automatic processing of the head cleaning from being executed in the case that there is little dirt on the head and also there is few errors in reproduced digital data by adding an error detection circuit and an error counting circuit. CONSTITUTION:The summed-up time of a summed-up timer 4 is monitored by a time measurement circuit 5. When the time fixed in advance is measured in the summed-up, the timer 4 is reset and started and also an output pulse is supplied to the error detection circuit 6 by the time measurement circuit 5. The error detection circuit 6 is started by the output pulse, and the error in the digital data which is read out by a magnetic head 1 and demodulated by a recording and reproducing circuit 2 is detected by the detection circuit 6. The number of errors detected by the detection circuit 6 is counted by an error counting circuit 7, and when the number of the errors exceeds a threshold fixed in advance, a head cleaning signal is outputted by the error counting circuit 7. And then, the display of the head cleaning or the automatic head cleaning is executed by the head cleaning signal.

Inventors

• 👤 Haruyuki Inohana
• 👤 治行 猪鼻
• 👤 Shozaburo Sakaguchi
• 👤 坂口　正三郎
• 👤 Masahiro Kusuki
• 👤 楠木　正啓
• 👤 Isao Endo
• 👤 功 遠藤

Bibliographic Details