Introduction to channel capacity, symbol rate (baud) & message space. This is the first step towards more modern measures of information. Featuring the Baudot multiplex system & Thomas Edison's quadruplex telegraph. Play with the pulse generator! http://www.khanacademy.org/cs/symbol-rate-exploration/1528686552 Play with message space generator! http://www.khanacademy.org/cs/message-space-exploration-edit-copy/1528863275 References: Transmission of Information - R. V. L. Hartley An Introduction to Information Theory: Symbols, Signals and Noise - John R. Pierce