Name: 源編碼 (錢幣語言：4/16) (Source Encoding (Language of Coins: 4/16))
Uploaded: 2021-01-14T04:32:23.000Z
Duration: 5 min 57 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

[ALICE - MUFFLED] Hello? I can't hear you.

[BOB - MUFFLED] I can hear you, but just barely.

which is much easier to detect over the noise.

How do they encode their messages as plucks?

they tackle the most common messages first  --

In this case, the messages they are sending

in this case, the eleven possible numbers,

At first, they decide to use the simplest method.

They send the result as the number of plucks.

So, to send a '3,' they send three plucks.

However, they soon realize that this takes

From practice, they find that their maximum pluck speed

So two plucks per second can be thought of as the 'rate' --

or 'capacity' -- for sending information in this way.

so it takes 3.5 seconds to send the number 7.

Alice then realizes they can do much better

She realizes that the odds of each number being sent

the number of ways each result can occur.

7 -- to the shortest signal -- one pluck.

She then proceeds to the next most probable number.

And if there is a tie, she picks one at random.

In this case, she selects 6 to be two plucks,

more information in the same amount of time, on average.

of sending two dice rolls -- using identical plucks.

However, after playing with the wire for some time,

[PLUCKS SHOWN IN SLOW MOTION -- NO SOUND]

字幕列表影片播放

源編碼 (錢幣語言：4/16) (Source Encoding (Language of Coins: 4/16))

number

send

noise

graph