| 摘要 |
<p>PURPOSE:To obtain a test tape which can confirm esily the detection level of the density of a magnetic flux recorded on a tape, by recording many signals different in magnetic flux density in steps. CONSTITUTION:A part A in the figure has such sufficient magnetic flux density phi1 and recording time T1 that an automatic music selecting device discriminates it as a signal part. When the test tape is set to a tape driving device and the driving device is set to the automatic music selecting state, the automatic music selecting state is kept while the part A is detected; and when a part N is detected, the automatic music selecting state is released because the magnetic flux density reaches the detection level of the magnetic flux density of the automatic music selecting device. That is, signals purposing discriminating parts A, B, and C as signal parts and a part N as a no-signal part are recorded on the test tape.</p> |
