Browse Prior Art Database

Multichannel Microfilm Document Transmission and Reproduction

IP.com Disclosure Number: IPCOM000097755D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 53K

Publishing Venue

IBM

Related People

Chiang, FC: AUTHOR [+2]

Abstract

A document retrieval and transmission system provides communication between a central document storage file 30 and a plurality of remote inquiry stations over a single closed circuit path by means of electrical delay lines. Each remote inquiry station includes a plurality of serially connected time delay keyboards 11, 11' and 111 from which information, such as requests for documents from file 30, may be sent. Each key board includes a delay line 12 having tapped sections 12a, 12b, 12c, etc., from which pulses are taken off through selectively closeable switches 13a, 13b, 13c, etc. Switches 13 are closed by operation of the keyboard to represent different characters to be transmitted. A time delay keyer 16 controls the actuation of the keyboards in timed relation to the other keyboards at other locations.

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Multichannel Microfilm Document Transmission and Reproduction

A document retrieval and transmission system provides communication between a central document storage file 30 and a plurality of remote inquiry stations over a single closed circuit path by means of electrical delay lines. Each remote inquiry station includes a plurality of serially connected time delay keyboards 11, 11' and 111 from which information, such as requests for documents from file 30, may be sent. Each key board includes a delay line 12 having tapped sections 12a, 12b, 12c, etc., from which pulses are taken off through selectively closeable switches 13a, 13b, 13c, etc. Switches 13 are closed by operation of the keyboard to represent different characters to be transmitted. A time delay keyer 16 controls the actuation of the keyboards in timed relation to the other keyboards at other locations. Keyer 16 in turn is controlled by a master timing control circuit 18.

The output signals from the closed switches of the first delay keyboard 11 are supplied over a conductor 14 to the common input conductor for the switches of delay keyboard 11'. The output from the end of delay 12 is supplied over a conductor 15 to the input of the delay line in keyboard 11'. Similar connections are made from 11' to 11 through conductors 14' and 15'. The pulse appearing on conductor 15 at the output of 11 is thus delayed by an amount corresponding to the sum of the total delays of 11, 11' and 11. The pulses appearing on conductor 14 are delayed by amounts corresponding to the positions of the closed switches on 11, 11' and 11.

The output pulses on 14 and 15 are transmitted over a single channel transmission line to the central file location where they enter a detecting and decoding network 22. Network 22 includes a delay line 23 having sections 23a, 23b, 23c, etc.. The total number of such sections equals the sum of the delay sections in 11, 11' and 11 . The different taps between sections of delay line 23 are connected as one input to an associated one of a plurality of coincidence gates 24a, 24b, 24c, etc. The pulses on 14 are s...