Multimedia Compression Question:

What does AAC standard for? Explain how it works?
What do you understand by rate distortion theory?
Define lossless channels.
What are the parameters used in silence compression?
Define vocoders.
Explain decimation & interpolation.
Why cutoff frequency for anti-aliasing filter is 7khz & 8khz?
How masking qualities of human ear is used in reducing number of bits in uniform quantiser?
Give the Nyquist rule.
What are the disadvantages of video compression?
Explain MPEG-7.
Describe the aims of MPEG-21.