Locating Defects in Magnetic Recording Tape
The use of magnetic recording tape for the more critical types of recording has made new tape-testing methods necessary. This paper describes an instrument for making instantaneous uniformity-of-response tests by locating and registering the number of individual cycles of output voltage whose amplitudes are below a pre-set level. This threshold level is the dc control voltage for an AND gate. It is set on the basis of a percentage of the ac peak voltage entering the gate so that, if the threshold control is set at 50%, the ac peak voltage must exceed 50% in order for the gate to operate. The electronic circuits, particularly the voltage-sensing circuits, are described and mechanical requirements for the tape transport mentioned.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.