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Course: Computer science theory>Unit 3

Lesson 2: Modern information theory

Symbol rate

Introduction to Symbol Rate (Baud). Created by Brit Cruise.

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• Is the black rectangle on the Baudôt keyboard another key that can be used somehow?
• Good question! And no, it's just a divider.
• What is with the dolphin at ?
• uses a dolphin because it emits high-frequency noises often, making the waves and symbol rate easy to measure
• Is a pulse the same as a signal?
• I was wondering... At around I hear the same voice as the person who was teaching Morse Code from earlier videos. Is this the same person?
• Yeah, this is Brit Cruise. He does computer science stuff.
• Why do signals "run together at the receiving end of a com-line"? I didnt understand the explanation given at .
• This is the result of noise like shown in the other video.
Also, you can think about the string plucking. You can pluck out a message rather quickly, but the vibrations of the string on the other end bounce back and forth causing the "bleed" or overlap
• At how does the character light two matches at once? does anyone know?
• He puts the match between the two. Also, what does this have to do with the video?
• And another question: if the symbol rate is how many signals you can squeeze in a given amount of time, what's capacity?
• The channel capacity of a given channnel is the highest symbol rate possible through that channel while still sending an understandable message. If you send a message at a higher rate than the channel capacity, the message will likely not make sense to the recipient.

I hope this clarifies channel capacity!
• At it seems that the letters of the teletype-writer is represented by 7 pulses instead of the supposed 5, am I misunderstanding the image?