November 03, 2016 Thursday
Bedtime Story
How Delay was Converted to Memory or Storage
How Delay was Converted to Memory or Storage
Comparison of 2 subsequent echoes were made from each location,
and wherever there was no change, the electrical pulse was erased.
This would erase out all the stationary undesired artefacts.
How was this achieved?
That was a clever bit of electrical gimmickry and you are going to
love it.
A delay line or a unit was set up between the receiver and the
display monitor.
The signal that was sent from the receiver to the display was
divided or split into 2 which as we ophthalmologists know, is accomplished by a
beam splitter only in our case the pulses come as photons.
One pulse was sent directly to the monitor while the other sent to
the delay unit.
Using an electronic technique called pulse repetition frequency
(PRF) the delay unit creates a lag in the pulse.
The lag is calculated in such a manner so as to make the exit of
the delayed pulse from the delay unit coincide with the next newer pulse being
collected by the receiver’s antenna.
The delayed signal is then inverted and made to amalgamate with
the next incoming signal.
If the new incoming signal is exactly the same as the previous
made-to-lag signal, they would cancel each other out.
This would erase all the redundant information of the stationary
objects that was superfluous.
Now at this stage you may wonder what this delay and radar has to
do with memory or storage.
At least I could not get the connection at the first glance of it.
But some clever apes did.
They latched on to the fact that even that fraction of delay made
to happen by that PRF or the pulse repetition frequency technique tantamounts
to storage of information for that fraction of time.
If the delay was recycled for a longer period of time without
losing it, that is equivalent to having it in memory for that period.
For electrical engineers, it was not a difficult task with their
knowledge of electronic circuits.
One of the first, or rather the first such smart engineer to do so
was the American John Eckert at the University of Pennsylvania’s Moore School
of Electrical Engineering.
Stay tuned to the voice of an average story storytelling
chimpanzee or login at http://panarrans.blogspot.in/
Good night and my fellow cousin ape.
Another great educator and a teacher that I am aware of is
Professor Subhashish Chattopadhyay in Bangalore, India.
While I narrate stories, Professor Subhashish an IIT graduate and
a former professor at BARC, does and teaches real mathematics and physics.
He started the participation of Indian students at the International
Physics Olympiad.
Do visit him here:
All his books can be downloaded for free through this link:
For edutainment and English education of your children, may I
suggest this large collection of Kids Songs:
No comments:
Post a Comment