'wwii' Episodes

PCM, Origins of Digital Audio

     5/3/2020

Every day we are inundated with digital audio: phone calls, music, even this podcast. Digitized sound has become so ubiquitous that it often fades into the background. What makes this all possible is a technology called Pulse Code Modulation, or PCM. This isn't new technology, its roots trace all the way back to 1937. So how exactly did digital audio come into being well before the first digital computers?

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Important dates in this episode:

1937: PCM Developed by Alec Reeves
1941: Germany Cracks A-3 Code
1943: Bell Labs Develops SIGSALY(aka The Green Hornet)
1957: First PCM Synthesizer, MUSIC I, Programmed by Max Mathews


ENIAC, Part I

     11/16/2020

Completed in 1945, ENIAC was one of the first electronic digital computers. The machine was archaic, but highly influential. But it wasn't a totally new take on computing. Today we are taking a look at the slow birth of ENIAC, how analog computers started to fall apart, and how earlier ideas transitioned into the digital future.

Like the show? Then why not head over and support me on Patreon. Perks include early access to future episodes, and bonus content: https://www.patreon.com/adventofcomputing


(OldComputerPods) ©Sean Haas, 2020