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 as a non-member 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 $33 for non-members and is free for AES members and E-Library subscribers.