AHR'S Talk at Basildon - 8/2/67
"SOME LANDMARKS IN TELECOMMUNICATION"
The telecom "explosion" could do harm as well as good. Telecom gives couplings. (Slides 1 and 2 : tuned cct, couplings.)
If the circuits are tightly coupled, you get a similar response curve as to each - if they are losely coupled then you get two response curves. However if they have just the right coupling then you get a curve which is something completely new.
LANDMARKS (up to about AD 2020, in chronological order, past, present, and future
- PCM (Slide : principle, - from KW's paper, Fig. 5, top.) (Slide : portrait of PCM's inventor.)
- FM (Nerve pulses - and as in stochastic computing.)
- LSI (Miniature Large-Scale Integrated circuitry, in primitive life.)
- Negative Feedback (direct,functional stored, and organic self-restoring)
- Radio (Slide 5 portrait of the inventor: the electric eel.)
- PCM re-invented, version (a) (Slide 6 : tomtoms.)
- PCM re-invented, version (b) (Slide 7 : smoke signals.)
- Waveguides (The speaking tube.)
- The telephone (By Graham Bell.)
- The Baudot Telegraph
- Radio re-invented. (Maxwell, Herz, Lodge, Marconi.)
Semicbnductor Detectors (crystals and coherers by Lodge, Branly, Marconi, etc., were the first practical types.
- Analogue radio The Poulsen arc made radiotelephony and CW telegraphy possible.
- The triode valve (De Forest)
- the water-cooled radio transmitting valve (incl. the copper-glass seal). Made practical radiotelephony, for point-to-point and broadcasting.
(Slide 8 : photo of station 2WP.)
(Slide 9 : our 1922 Birmingham broadcaster.)
- First telephony across the Atlantic (of any kind), (Long Island to
New Southgate.) (Slide 10 : New Southgate radio receiver.)
- TV by Logie Baird.
- Discovery of long-distance short-wave radio propagation, by a schoolboy, Goyder.
- Negative feedback (direct), re-invented by H.S. Black, making practical :-
- Multi-channel "Carrier" systems ("wired wireless"), for wired telephony.
- Quartz-crystal frequency control.
- FM re-invented (by Armstrong)
- Microwaves for practical radio links. (By A.G. Clavier, et al.)
- Digital telephony (AM, PTM.)
PCM again re-invented, by A.H. Reeves.
Delta, invented by E.M. Deloraine.
(Slide 11 : Cattermole and Reeves, with equm. coder mechanical model.)
- Integrated circuitry re-invented (by gas gaps).
- The transistor
- Trans-ocean,telephone cables
- Telecom by satellites
- Integrated circuitry again re-invented (by semiconductors).
- Moletronics [ie nanotechnology - webmaster]
- Channel selection by new timing methods.
- Re-invention of Stored Negative Feedback, for easier tolerances.
- "CONLIN" circuitry (COoperative Non-LINear; For faster processing of telecom data and lower power consumption.
- Passive Reactance circuitry.
- Cheap and efficient refrigeration (cryogenics)
- OPTICAL TELECOM
- The laser
- Low optical-attenuation fibres
- Purely optical bistables, clippers etc.
- Optical integrated circuitry
- Picosecond logic, by statistical drop-out.
- Straight-line telecom, by neutrinos(or anti-neutrinos).
- "Thought-wave" telecom, direct.
- "Thought-wave" telecom, by artificial means.