Design of a multichannel magnetic recording system for frequency multiplication

This paper concerns a multichannel magnetic tape recorder/reproducer whose primary function is to provide stable, real-time multiplication (100 times) of all frequencies present at the input. This is accomplished by the use of rotating playback head assembly, located near and "downstream" of a conventional record station. This arrangement yields a short processing delay and, because of the iterative scans, makes possible time division multiplexing of other system components. System requirements and characteristics are presented along with a discussion of the major engineering problems that had to be solved.