| 摘要 |
<p>An apparatus and method measure the recording quality of a magnetic recording medium (21). A magnetic medium recorder (14) records signals on the recording medium (21) and detects signals recorded on the medium (21). A pattern generator (13) coupled to the magnetic medium recorder (14) produces a test signal (202) that includes at least one pulse that has an amplitude that is a minimum read amplitude relative to the amplitude of a reference condition. The sequence of pulses preferably represents the data pattern (302) that will be recorded on the medium (21) under normal operating conditions and that has such a minimun amplitude. A pulse amplitude detector (20) has a first input coupled to the magnetic medium recorder (14). The pulse amplitude detector (20) supplies a pulse detect signal (27) having a first state indicative of a detected pulse, in response to the pulse amplitude of the detected signal applied to the first input of the pulse generator (13) being greater than a threshold, and supplies the pulse detect signal (27) having a second state indicative of a missing pulse, in response to the pulse amplitude of the detected signal applied to the first input of the pulse generator (13) not being greater than a threshold.</p> |
