Teletype Corporation

At&t Teletype Corporation

Paul L Mika

Wayne R Herbst

Donald M Genaro

Chris G Johnson

Kurt Rothlisberger

Richard F Vee

Edwin D McQueen

Frank C Alterio

Daniel Harden

Voice data communications terminal

A series of digital words are demultiplexed into two groups and recorded on parallel tracks of a magnetic tape. The digital information is phase encoded upon the two tape channels and during playback the magnetic flux reversals on each channel are separately detected. The peak level of the detected signal is sensed and a peak signal pulse generated corresponding to the occurrence of the peak of the detected signal. Means are additionally included for setting the minimum threshold of the incoming signal necessary to generate a signal pulse so as to provide a level of immunity to system noise. The peak signal pulses are decoded to reconstruct the original data signal and a clocking signal. The data from each of the channel decoders is clocked into respective channel shift registers and multiplexed into its original data word arrangement.

Apparatus and method for recording and reproducing digital-data

An apparatus and method for cleaning an informational tape carried in a tape cassette. The cassette is positioned within a cradle defining a rear wall. Mounted to the wall for rotary movement thereon is a bobbin wrapped with cleaning fabric. Coaxially secured to the bobbin is a ratchet wheel and positioned for actuation of the ratchet wheel is a drive pawl. The drive pawl is carried by a pawl arm mounted for substantially linear movement in response to the placement of a tape cassette within the cradle. Positioning of the cassette within the cradle imparts linear motion to the pawl arm causing the bobbin to incrementally rotate exposing a clean segment of the cleaning fabric to the informational tape.

Apparatus for cleaning an informational tape

Apparatus for recording and reproducing digital data

Growing community of inventors

Des Plaines, IL, United States of America

Paul L Mika