[A-DX] Fwd: Breakthrough: The Ideas That Changed The World The Smartphone #106

[Roger]

-------- Weitergeleitete Nachricht --------
Betreff: 	[WOR] Breakthrough: The Ideas That Changed The World The 
Smartphone #106
Datum: 	Fri, 24 May 2019 01:01:53 +0000 (UTC)
Von: 	Glenn Hauser via Groups.Io <wghauser=
An: 	


I`ve just watched this excellent show on PBS/OETA World channel. Check 
your listings --
Altho leading up to smartphone, a quick history of communications from 
fire signals to Morse code to Hedy Lamarr and beyond. And yes, that`s 
Patrick Stewart narrating.
Appears to be the last in the series. Previous episodes well worth 
watching too.
Glenn

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PBS:
https://de.wikipedia.org/wiki/Public_Broadcasting_Service
Rechtsform  öffentliches Rundfunkunternehmen
Gründung    3. November 1969
Sitz        Arlington, Virginia, USA
Leitung     Paula Kerger, Präsidentin[1]
Branche     Massenmedien
Website www.pbs.org


https://www.pbs.org/video/the-smartphone-a9ju6c/
"....Breakthrough: The Ideas That Changed the World
The Smartphone
Episode 6 | 54m 51s
Dial in to the fascinating history of the smartphone, from its roots in 
Morse Code to 2007, when Apple unveiled the first-ever iPhone. Plus, see 
how the next generation of smartphones will allow us to communicate 
through them just by thinking.
Aired: 05/22/19
Expires: 06/19/19
Rating: TV-PG

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Funktioniert via Browser nur über einen US-Proxy, in meinem Fall über 
eine IP aus dem Bereich des Sendegebietes von  KQED.

Ansonsten:     "We're sorry, but this video is not available in your 
region due to rights restrictions."


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Der direkte HLS-m3u8 -Stream  ist dagegen NICHT geo-geblockt. Datei hat  
ca.  1,5 GB,   MP4 mit  h264   1920x1080 / 30Hz  / audio:  aac
(lt. Abspann auch bei AMAZON PRIME VIDEO, aber wahrscheinlich wieder nur US)

Sehr interessanter Beitrag mit einem Streifzug durch die Geschichte der 
Kommunikation seit der Antike (optische Fern-Kommunikation), 
Frequenz-Sprungverfahren von Hedy Lamarr
und auch:  https://en.wikipedia.org/wiki/SIGSALY
SIGSALY used a random noise mask to encrypt voice conversations which 
had been encoded by a vocoder. The latter was used both to minimize the 
amount of redundancy (which is high in voice traffic), and also to 
reduce the amount of information to be encrypted.
The voice encoding used the fact that speech varies fairly slowly as the 
components of the throat move. The system extracts information about the 
voice signal around 25 times a second.
     ten channels covering the telephone passband (250 Hz – 2,950 Hz); 
are rectified and filtered to extract how much energy is in each of 
these channels.
     another signal indicating whether the sound is voiced or unvoiced;
     if voiced, a signal indicating the pitch; this also varied at less 
than 25 Hz....."




roger