Week 1 Part 2

AUDIO

ACTIVITY #7

DISCOVERIES

Q1) What are the available file formats ?

1) MP3: MP3 is coding format for digital audio that compresses a sound sequence into very small files, to enable digital storage and transmission.MP3 as a file format commonly designates files containing an elementary stream of MPEG-1 Audio or MPEG-2 Audio encoded data.

2) FLAC: FLAC (Free Lossless Audio Codec) is an audio coding format for lossless compression of digital audio. FLAC is a musical file format that offers bit-perfect copies of CDs but at half the size.

3) WAV: WAV(Waveform Audio File Format) is an audio file format standard, developed by IBM and Microsoft, for storing an audio bitstream on PCs. It is the main format used on Microsoft Windows systems for uncompressed audio. A usually uncompressed lossless computer file format used for the storage of digital audio data.

4) ATRAC : ATRAC(Adaptive Transform Acoustic Coding) belongs to proprietary audio compression algorithms developed by Sony. ATRAC allowed a relatively small disc like Minidisc to have the same running time as CD while storing audio information with minimal loss in perceptible quality.

Q2) What is a waveform, amplitude and frequency?

1) Waveform: A waveform is a image that represents audio signals or recording and shows the changes that takes place over a certain time. Usually recordings show waveforms to give the user visual idea.

For example: The waveform might be small when a vocalist is singing , but it becomes larger when when a guitar or drum is played .

2) Amplitude : The maximum height of a wave from the middle of the wave to its peak .

For Example: The sound wave produced by a theatre actor while saying its dialogues to the audience has a higher amplitude than the sound wave produced by someone in the audience whispering to their friend.

3) Frequency : An audio frequency or audible frequency is a periodic vibration whose frequency is in the band audible to the average human, the human hearing range. The SI unit of frequency is the hertz.

ACTIVITY 8

ACTIVITY # 9

DISCOVERIES

Q1) what are the available file formats?

1) Flash video : Flash video is a file format that used to deliver digital video content over internet using adobe file . There are two different Flash Video file formats FLV and F4V . Both formats are supported in Adobe Flash Player and developed by Adobe Systems.

2) GIF: A GIF or Graphical Interchange Format is a type of highly compressed image. . An animated GIF combines numerous images or frames into a single file and displays them in a sequence to generate an animated clip or a short video. The color limitations are up to 256 for each frame and are likely to be the least suitable for reproducing other images and photographs with color gradient.