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Ternary Reading Device

IP.com Disclosure Number: IPCOM000096890D
Original Publication Date: 1962-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Yingling, GE: AUTHOR

Abstract

Various methods of magnetic recording of in formation use the binary system. Here, information is represented by one of two magnetic conditions on a spot of a recording surface. These conditions are distinguished by being magnetized or not magnetized; magnetized in one direction or the other; or a change in magnetic condition which represents a 1 or 0, depending on convention. When using a ternary or three stable state method of recording information on a magnetic surface, a spot magnetized in one direction represents a first condition and a spot magnetized in the opposite direction represents a second condition. Finally, no magnetization represents a third condition.

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Ternary Reading Device

Various methods of magnetic recording of in formation use the binary system. Here, information is represented by one of two magnetic conditions on a spot of a recording surface. These conditions are distinguished by being magnetized or not magnetized; magnetized in one direction or the other; or a change in magnetic condition which represents a 1 or 0, depending on convention. When using a ternary or three stable state method of recording information on a magnetic surface, a spot magnetized in one direction represents a first condition and a spot magnetized in the opposite direction represents a second condition. Finally, no magnetization represents a third condition.

When using the ternary method of recording, the magnetic condition representing the first condition is read from a relatively moving recording surface by a current being induced in the coil of the read head in one direction. Similarly, the second condition recorded on the relatively moving surface induces a current in the other direction. When the third condition is read, there is no current induced in the coil.

In order to detect the three conditions, the output of a two output read amplifier is connected to three terminals as shown. A voltage is generated at one terminal during the reading of a first condition. A voltage is generated at a second terminal during the reading of a second condition. Moreover, when neither the first condition nor the second condition exists, no v...