2 ms·
Boils down to the fact that a phone line to a house was built with a a certain amount of bandwidth for a human voice, implemented with a lowpass filter of 4 kHz
by theoldlove 3y ago
Boils down to the fact that a phone line to a house was built with a a certain amount of bandwidth for a human voice, implemented with a lowpass filter of 4 kHz. But the article doesn’t explain or show why the magic 4 kHz number was chosen.
- rasz 3y agoThere are no filters and cable is not BW limited, otherwise ADSL wouldnt work on same wiring.
- quercusa 3y agoSee the section Long, long ago
- theoldlove 3y ago“Ultimately, they settled on approximately 3.2 kHz.” doesn’t really explain who made this decision, when, or why. All we get is “Long ago, when the phone networks were still completely analog, when the first real phone networks were being built, the engineers that were designing them faced a decision.” Who were those engineers? What company? How did they test what would be adequate bandwidth?