CARRIER OF MEASURING SIGNAL FOR SUPERVISING AND CONTROLLING THE FREQUENCY COURSE OF PLAY-BACK TUNEL OF TAPE RECORDERS ON A DISPLAYING EQUIPMENT

摘要

1365851 Testing magnetic recording and playback apparatus M L LJUDMIRSKY G M FORSHTATOR and Y S SHKUROVICH 3 Jan 1973 [3 Jan 1972] 433/73 Heading G5R A test record comprises a periodically recurring sequence of recorded signals of different frequencies, the rate of recurrence of the sequence being such as to yield an apparently unfiickering pattern on the screen of an oscilloscope connected to the playback channel being tested. The test frequencies may be spaced over the intended frequency range of the apparatus, or grouped round an expected minimum response point to check the head gap.