960 Bits In One Delay Line: Difference between revisions

From gpu
Jump to navigation Jump to search
Created page with "<br>Delay-line memory is a type of pc memory, largely out of date, that was used on some of the earliest digital computer systems, and is reappearing in the form of optical delay strains. Like many modern forms of electronic pc memory, delay-line memory was a refreshable memory, however versus modern random-access memory, delay-line memory was sequential-entry. Analog delay line expertise had been used because the 1920s to delay the propagation of analog signals. When a..."
 
(No difference)

Latest revision as of 15:19, 3 October 2025


Delay-line memory is a type of pc memory, largely out of date, that was used on some of the earliest digital computer systems, and is reappearing in the form of optical delay strains. Like many modern forms of electronic pc memory, delay-line memory was a refreshable memory, however versus modern random-access memory, delay-line memory was sequential-entry. Analog delay line expertise had been used because the 1920s to delay the propagation of analog signals. When a delay line is used as a memory device, an amplifier and a pulse shaper are related between the output of the delay line and the enter. These devices recirculate the signals from the output again into the input, creating a loop that maintains the signal as long as energy is applied. The shaper ensures the pulses remain effectively-formed, eradicating any degradation attributable to losses in the medium. The memory capacity equals the time to transmit one bit divided by the recirculation time. Early delay-line memory techniques had capacities of some thousand bits (though the time period "bit" was not in in style use on the time), with recirculation occasions measured in microseconds.



To read or write a particular memory deal with, it's essential to look ahead to the signal representing its worth to circulate by means of the delay line into the electronics. The latency to learn or write any explicit deal with is thus time and handle dependent, however now not than the recirculation time. This patent targeted on mercury delay strains, however it also discussed delay traces manufactured from strings of inductors and capacitors, magnetostrictive delay traces, and delay lines constructed utilizing rotating disks to transfer information to a read head at one point on the circumference from a write head elsewhere around the circumference. The essential idea of the delay line originated with World Warfare II radar analysis, as a system to cut back litter from reflections from the ground and other non-moving objects. A radar system consists principally of an antenna, a transmitter, a receiver, and a display. The antenna is related to the transmitter, which sends out a quick pulse of radio energy before being disconnected once more.
destinationmissoula.org


The antenna is then linked to the receiver, which amplifies any reflected signals and sends them to the display. Objects farther from the radar return echos later than those closer to the radar, which the show signifies visually as a "blip", which will be measured against a scale in order to find out vary. Non-shifting objects at a fixed distance from the antenna at all times return a sign after the identical delay. This could seem as a set spot on the display, making detection of different targets in the realm more difficult. Early radars merely aimed their beams away from the bottom to avoid the vast majority of this "muddle". This was not an ideal situation; it required cautious aiming, which was troublesome for smaller mobile radars, and didn't remove other sources of muddle-like reflections from features like distinguished hills, and within the worst case would allow low-flying enemy aircraft to actually fly "below the radar".



To filter out static objects, two pulses have been in contrast, and returns with the identical delay occasions were removed. To do that, the sign sent from the receiver to the show was split in two, with one path leading on to the show and Memory Wave the second resulting in a delay unit. The delay was carefully tuned to be some a number of of the time between pulses, or "pulse repetition frequency". This resulted in the delayed signal from an earlier pulse exiting the delay unit the identical time that the sign from a newer pulse was received from the antenna. One of many indicators was electrically inverted, sometimes the one from the delay, and the 2 signals had been then mixed and Memory Wave despatched to the show. Any sign that was at the identical location was nullified by the inverted sign from a previous pulse, MemoryWave Guide leaving only the shifting objects on the display. A number of different types of delay programs were invented for this objective, with one common principle being that the knowledge was saved acoustically in a medium.