A tape playback unit is designed to transmit messages recorded on an endless loop dual channel recording tape. The tape contains a series of independent messages recorded on one channel and stop-start signals coordinated with the beginning and end of each message on the other channel. A multiple of receiving units each having an audio receiver as in a telephone receiver, hereafter referred to as an earphone, are connected to said playback unit and the independent messages contained on the tape a...

One or more pages of a publication are provided with a pre-printed perforated area which may be removed from the remainder of the page or with a pre-printed form which may be peeled from the page. The perforated areas provide individual cards when removed from the page, while the peelable forms are placed on a backing when they are separated from the page. The cards and backings are provided with shaped cut-outs at one edge for placement in a suitable storage container.

Disclosed is a system for transmitting and receiving add-on information in conjunction with the transmission and reception of TV signals. In accordance with the invention there are provided first and second add-on signal components in phase quadrature. The second add-on signal component has, during each TV line interval, a polarity opposite to the polarity of the first add-on signal component of the preceding TV line interval to achieve substantial visual cancellation of the add-on signal compon...

The specific information storage and retrieval system described herein stores 49,000 microfiches in a central file, any one of which may be viewed in a matter of seconds. More specifically, the central file uses an arrangement of 20 shelves mounted on a closed loop track, each holding 2,450 microfiches, each microfiche in turn having 50 or 60 separate images. When a particular microfiche is selected, the proper shelf is rotated into a predetermined position. Concurrently a viewing station includ...

Analog information storage apparatus for stabilized memory, comprising a magnetic film plated wire consisting of a central conductor core wire and a magnetic film plated around the core wire and a driving means intersecting the plated wire. At the time of write-in, a current of a fixed intensity is passed through the driving means and an information current is passed through the central core wire to store the information and, at the time of read-out, a read-out current is passed through the driv...

A surface containing encoded information bordered by bars where both the bars and the information contrast with a background is detected as to location and the information read by sampling the video scan output of a television camera. The effects of motion may be minimized by producing a strobed image in the television camera.

A system for restricting access to information stored in the memory of a data processing system to those persons possessing the proper security identity code is disclosed. The system includes an encoding network for generating a check symbol that is formed of a plurality of parity checking bits. The parity checking bits are encoded from the information word portion of the binary word that is to be written into and then read out of a specified address of an information store from the address word...

An information display method comprising forming an image of a chemiluminescent component on a support according to information to be recorded and placing the support bearing the image of the material in an atmosphere capable of effecting the chemiluminescence of the material to thereby display the image based on a difference in luminance.

An image informaton transfer device which is applicable to an image information transmission apparatus which makes use of a motor driven scanning element and is liable to be subjected to jitter by variation in speed of the motor. The device comprises a first shift register, a second shift register and a control part, whereby an information required to be transferred is stored between the most significant digit and the least significant digit without forming any vacancy therebetween.

Disclosed is electrocardiographic monitoring apparatus including a magnetic tape recorder having a dual channel input for receiving and recording EKG signal information from a human being simultaneous with voice communication from that human being. The audio and EKG signals are recorded on two tracks of magnetic tape for subsequent recreation by a dual channel magnetic tape reproducer. Novel encoding and decoding circuitry are also disclosed, the circuitry employing operational amplifiers interc...