Audio Compression

 

1.      Answer

a.      What is the size of a Macroblock? How many Y, Cr and Cb blocks does it contain?

b.      Give, one approach to deciding when to encode an I-frame in a video sequence. (I want you to give your answer based on your understanding)

2.      Answer

a.      What is the purpose of rate-control in H 261?

b.      What is the idea behind CBP (the Coded Block Pattern)?

3.      Answer

a.      In hierarchical motion vector estimation, what information from the lower resolution image is used in the estimation process with the next higher resolution image?

b.      Of the two logarithmic search mechanisms for determining the Motion Vector which is better? (Give your reasoning)

4.      Answer true or false

a.      P-frames take more space (in terms of bytes) than I-frames.

b.      In H.261, I-frames use uniform quantization.

c.      In H.261 the reference frame is always the next I-frame.

d.      The motion vector is computed for a Macroblock.

e.      H.261 was targeted towards the home telephone market.

f.       The P in P-frames stands for “previous”