Patent GB-903928-A (GB)
Title: Variable capacity information storing transmission link
Inventor: DALEN CHRISTIAAN JOHANNES VAN
IPC: H04L1/18
Filed: 1959-01-01
Abstract: 903,928. Magnetic data-storage apparatus. DE STAAT DER NEDERLANDEN TEN DEZE VERTEGENWOORDIGD DOOR DE DIRECTEUR-GENERAAL DER POSTERIJEN TELEGRAFIE EN TELEFONIE. Jan. 1, 1959 [Jan. 10, 1958], No. 55/59. Class 106 (1). [Also in Group XL (b)] In a signal transmission system with a variable capacity information storing transmission link between an incoming source and an outgoing transmitting member, a storage or memory arrangement comprises a registration channel with a variable capacity comprising a recording member of indefinite extent between the signal source and outlet in operative association with electrical registration means having a limited capacity for the total number of signals which can be registered. At the resumption of signal reception and transmission, the last four signals of the previous transmission are in the taut tape B between the feed rollers X, Y. When as indicated diagrammatically by Fig. 2, 5-unit signals a, b, c are received over the incoming line they are stored on the 4-character magnetic core register BG (Fig. 3, not shown), and feed pulses at Sti step the roller X and via gate C1, open when the storage register BG is not filled, and conductor Co the roller Y so that the tape B remains taut, and signals z, y, x are not transmitted from the reading-head W, since a switch S operated by the tape is in its upper position. A quest pulse over the connection Stu and normally open gate C2 passes to the input terminal Stu of the register BG so that the signal elements of first character a are transmitted over the closed upper contacts t2 of switch S2. Signals d, e are stored on the tape B and also in the register BG. As the register is now full, the gate C1 is closed to the pulse Sti so that the rollers Y are not actuated and the signal f is recorded on the tape B which becomes slack and is also stored in the register BG. Subsequent signals g, h are stored on the tape B and also in the register BG. The next quest pulse passing over lower closed contacts t1 of switch S1 and connection Co operates the rollers Y to step the tape past the read head W so that the signal elements for the character b are passed over the lower closed contacts t2 of switch S2. When the character i is received before the tape has become taut, it is recorded on the tape B and set up on the register BG. The next request pulse received over Stu operates rollers Y and causes d to be transmitted from the tape followed at the subsequent instant by transmission of the letter e when the tape B again becomes taut. Subsequent quest pulses from the terminal Stu pass to the input Stu<SP>1</SP> and step the register BG to transmit the elements for the series of characters f, g, h, i which are erased from the register, but retained in the taut tape between O and W. In a modification, Fig. 4 (not shown), signals are not recorded on the tape B until the register BG is full. Separate counters provide indications of the number of characters stored in the register and number of request pulses necessary to step the tape so that all characters recorded therein are transmitted. Gating circuits allow timing pulses to pass to rollers X when the register BG is full and also the first counter also determines when signals are to be recorded on the tape. The second counter is controlled by the tape and the request pulses in conjunction with gating circuits which are respectively controlled by a specific indication of the counter and in accordance with character registration in BG. A storage arrangement comprising magnetic cores, distributer and stepping arrangements, and forming the register BG is described in connection with Fig. 3 (not shown).