Browse Prior Art Database

Pulse Translating System

IP.com Disclosure Number: IPCOM000098119D
Original Publication Date: 1960-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Noonan, R: AUTHOR

Abstract

The system provides control of upper and lower clipping levels in magnetic tape read amplifiers so that the sensitivity of the system to spurious noise pulses read from the magnetic tape is substantially reduced.

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Pulse Translating System

The system provides control of upper and lower clipping levels in magnetic tape read amplifiers so that the sensitivity of the system to spurious noise pulses read from the magnetic tape is substantially reduced.

The read system includes the final amplifiers 10 through 16 associated with channels 1, 2, 4, 8, A, B and C of the tape, the skew register triggers 20 through 26 controlled by the output of the final amplifiers, and the line register triggers 31 through 36 controlled by the skew register triggers.

The final amplifiers 10 to 16 inclusive are arranged to normally clip the bit pulses read from the tape at a relatively high value of a lower amplitude clipping level which exceeds the amplitude of the great majority of noise pulses read from magnetic tape. A clipping level control circuit provided in each amplifier 10 through 16 is effective, upon being energized, to very substantially lower both the upper and lower clipping levels of the amplifier.

The first skew register trigger to be turned on by an information bit which is read from the tape turns on a single shot clipping level control multivibrator 42. This applies a pulse potential of approximately information bit duration to the clipping level control circuit of each amplifier. Such action abruptly reduces the normal high value of lower clipping level to a value adequate to translate the lowest amplitude information bit read from the magnetic tape.

Thus, the read system normall...