Broadband and Brandwidth

1.    What is broadband?
Broadband refers to telecommunication in which a wide band of frequencies is available to transmit information.

2. What units are used to measure bandwidth?

3. How much faster is broadband than dial up?

4. What are the speeds that broadband operates at compared to dial up?

5. What are some of the advantages of using a broadband connection to download something like a video compared to dial up?

Definition

Stereo-A sound system, typically including a CD, tape, or record player, that has two or more speakers and produces stereo sound.

Channel- Its different sounds or tracks for recording sound such as stereo; left and right channel. Channels of the rear, channel of the front etc.

Track- Is when something is still being edited in software.

Frequency-  the number of periods or regularly occurring events of any given kind in unit of time

Hertz- the SI unit of frequency, equal to one cycle per second

Decibel- A unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level

Wav- shore for Waveform Audio File Format.

mp3- A means of compressing a sound into a very small file, used as a way of downloading audio files from the internet.

aiff- Audio Interchange File Format (AIFF) is an audio file format standard used for storing sound data for personal computers.

Data compression

DATA COMPRESSION!

What is data compression?

What is a data compression ratio?

Why is data compression an important technique for the online world?

What is the difference between Lossy and Lossless data compression?

Which method offers the greatest compression ratio?

Why is human psychology and perception an important factor in methods of Lossy compression?

Introduction to video notes

Introduction to video notes

1.    What are some advantages of digital video
Digital video is the single most dominant form of live video and image capturing. Its capable of transforming the brightness of the light in a digital signal. To make a photo would not only increase the quality but also the quantity.

2.    What is meant by frame rate in video
Frame rates in videos refer to the speed at which the image is refreshed (typically in frams per second; FPS)

3.    Are all videos/movies the same frame rate, explain your answer

No because not all videaos and movies have the same frame rates. An example would be if someone was running a marathon there would be lots of movement there fore there would be a lower frame rate and would have an effect on quality. But if someone was reading a book there would be little movement and would no have a major effect on quality. The frame rate depends on what is being filmed and the movements/ actions which are being done.

4.    What is meant by resolution, how is it measured.
Resolution is the term used to describe the number of dots, or pixels, used to display an image.
Higher resolutions mean that more pixels are used to create the image. When a monitor's resolution is described, the description generally consists of the number of dots (pixels) contained in each line followed by the number of lines on the monitor. The number of dots per line can be multiplied by the number of lines to identify the total number of pixels displayed by the monitor.

5.    What is the colour system called RGB

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The RGB color model is an additive color model in which red, green, and blue light is added together in various ways to reproduce a broad array of colors.6.    Explain the video standards PAL, NTSC, and SECAM, what are the main differences between them.

PAL- (Phase Alternating Line) is the format for the UK and most European countries, except France.
NTSC- (National Television System Committee) is used in North American, Japan, and most of the countires in South America
SECAM- (Séquentiel Couleur à Mémoire—Sequential Color with Memory) Parts of Easter Europe use it.

7.    Which standard do we use in Australia?
the standard commonly used in Australia is PAL

8.    What is an IEEE 1394 port
Its also known as FireWire, its a component originated from Apple which, like a USB, allows the connection of peripherals to a computer, such as video cameras. However, there is one distinct difference. IEEE 1394 supports much higher bandwidth than USB, allowing you to get feed from a high-resolution video camera onto a computer without experiencing issues.
9.    Why do digital video cameras use video compression
Difital video camera's use video compression because once a videao signal is digital, it needs a large amount of storage space and transmission badwidth. Video compression reduces the amount of sata, several strategies are employed that compress the information. It does this without affecting the quality of the image.

10. Describe what a codec is.
It is a microchip that compresses or decompresses data.

11. What is meant by “generation loss”, where does it happen?
Generation loss refers to the loss of quality and potential increase of file size between subsequent copies of data. This occurs with old technology, and sometimes when trying to burn a video from an old camera, each time the video is burnt, the quality becomes weaker and weaker, generation loss.

Making sound

1. Sound moves through what medium?

Liquid?

2. Briefly describe how a microphone works, in particular what does it gather and what does it produce? 

A microphone has small membrane that vibrates, it also has a mchanism that translates moovements of the membrane into electrical signals. When acoustical waves are translated into electrical waves by the micrphone. The higher the pressure the higher voltage, the lower the pressure the lower the voltage.

3. What unit is used to measure sample size?

 Measured in bits.

4. What unit is used to measure sampling rate?

 Measured in Hertz (Hz).

5. How does sound quality vary with sample size and sample rate.

If sample size is increased, the quality increases. 
increase sample rate it also increase the sample quality.

6. What is another name for sample size?

 Sample format.

7. From the information given which offers better quality sound, FM radio or AM radio?

FM radio has better quality sound.

8. Why not record all sound in extremely hight sample sizes and sample rates?

To much memory and space would be taken up.

Ringtone

My Ringtone made on Audacity.

I have made this ring tone on the computer program, Audacity. First i downloaded the song 'Another world' by one direction and when they say 'Hi we're one direction'.

The i added the sounds to the program and trimmed the parts i didnt want, i did that by selecting what i wanted to trim then went to 'edit' and 'trim'.

I then selected the end part of the song 'Another world' and went to 'effect' and 'base boost' to add a strong base to that section.

Then i selected both the song itself and when the boys talk and made the pitch of their voices high by; clicking 'effect' and 'change pitch'.

Once I had finished creating the ringtone, i saved it. To upload it on my blog i needed to make it a movie so I went onto movie maker uploaded three pictures onto movie maker that realated to One direction and their song 'Another world' and placed the ringtone i created onto it.

 I then had to save the movie by clicking 'save movie' then 'forcomputer'.