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Science Project part 2

Grace French

on 19 April 2010

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Transcript of Technology

Technology By: Liz White-Hatton and Grace French Analog Vs. Digital
Who will Win? Analog A wave is recorded or used in its original form Digital wave is sampled then turned into numbers that are stored in the digital device. Digital On a CD, the sampling rate is 44,000 samples per second. So on a CD, there are 44,000 numbers stored per second of music. To listen to the music, the numbers are turned into a voltage wave that mimics the original wave.
An example is an analog tape recorder. The signal is taken straight from the microphone and put onto the tape. The wave from the microphone is an analog wave, so therefore the wave on the tape is analog too. The wave on the tape can be read amplified and played through the speaker to produce sound. How does Wi-Fi work? A computer's wireless adapter turns data into a radio signal and sends it through an antenna.
A wireless router receives the signal and turns it back into data.
The router sends the data to the Internet through a wire called and Ethernet connection.
The process also works in reverse. The transmition is at 2.4 GHz or 5 CHz. This frequency is way higher then the frequencies used for cellphones or walkie-talkies. The high frequency also allows the transmission to carry more information. You see it everywhere "Wi-Fi hotspot". But do you know what it means? DIGITAL WAVES HAVE THE LEAD
The recording does not degrade over time. As long as the numbers can be read, you will always get exactly the same wave.
Groups of numbers can often be compressed by finding patterns in them.
The FCC has deliberated and decided...
Digital waves are our winner. From now on television signals are all digital. No more old fashioned analog. You have to have a new digital television of convertor box to recieve any television signal at all. You can now also get Over-The-Air HD. Which makes picture quality a lot better. Next time your in a Wi-Fi hotspot maybe you'll think about all the steps that have to be taken for you to pull up your email and check your facebook. How does an OTA HD signal work? A transmitter sends audio and video signals over the air waves. A reciever recieves the transmitted signals and turns the radio waves, which include audio and video signals, into useful signals that can be processed into an image and sound. The TV is a display device that has the technology to turn the electric signals into visible light. Each channel is transmitted on its own frequency.
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