GB1351111A - Apparatus for selectively distributing signals - Google Patents

Abstract

1351111 Signal distributer NATIONAL RESEARCH DEVELOPMENT CORP 17 Aug 1971 [27 May 1970] 25511/70 Heading G4A Apparatus for supplying signals to a plurality of channels includes a plurality of gating means 22, 23; 24, 25; 26, 27; and 28, 29 whose outputs are connected to a respective one of the channels, storage means 19, 20 storing a plurality of signals and presenting them a fixed number at a time to the gating means during each of a succession of intervals, and a plurality of control means 14, 15, 16, and 17 each associated with a respective gating means and storing a chosen sequence of gating signals which are presented, one during each interval, to the associated gating means. As described the channels are inputs to a number of Digital Differential Analysers 10, 11, 12, 13. In operation the dz outputs of the DDA's are fed to the stores 19, 20, store 19 storing 1 for a +ve increment and 0 for a zero increment and store 20 1 for a - ve increment and 0 for a zero increment. The signals in the stores are then fed out serially to the gating means which are rendered conductive or otherwise in accordance with the bit appearing at the output of their associated control means 14-17. The control means and stores 19, 20 may be shift registers which are shifted in synchronism by clock pulses from a source 18. In accordance with the contents of the control means 14-17 the respective DDA's can be supplied with the outputs of a selected one or ones of the DDA's. In a modification, Fig. 2 (not shown), two or more apparatus as shown in Fig. 1 may be provided, each DDA in each apparatus being provided with an additional gating and control means for each other apparatus in the system, the additional gating means being provided with inputs from the stores (19, 20) of one of the other apparatus and with appropriate control signals. It is stated that each DDA may not be provided with a gating means for every other apparatus, only selected interconnections being provided. In a further modification the storage means (19, 20) of one apparatus may be connected to receive some of the DDA outputs from one or more of the other apparatus. In this case the storage means of the one apparatus presents the additional signal(s) in respective additional intervals to its gating means, the associated control means storing extra control bits in order to distribute the additional signals as required.