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Publisher
The Great Courses
Pub. Date
2022.
Language
English
Description
In the 1870s, Alexander Graham Bell was trying to improve the telegraph when he and his assistant discovered that speech itself could be transmitted over telegraph wires. Explore the subsequent engineering developments that brought the telephone to almost all households, including Bell's invention of twisted-pair cabling to reduce crosstalk, still in use today.
Publisher
The Great Courses
Pub. Date
2022.
Language
English
Description
In the original telephone system, the connection stayed in place until that one conversation was complete. But when email was developed in the 1970s and ‘80s, people weren't satisfied sending just one type of signal. Explore the development of the ethernet and internet and learn about the protocols that now allow us to send such a wide variety of information types.
Publisher
The Great Courses
Pub. Date
2022.
Language
English
Description
In the old-style analog telephone system, voltage increased and decreased across the wires, corresponding to the human voice signal. But in a digital system, that all changes. Learn how the human voice is changed into binary values, sent over the system, and then converted back into volts with the voltage applied to the speaker in the phone handset. The human ear takes it from there.