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authorMohit Agarwal <mohit.agarwal@sky.com>2021-10-09 19:08:24 +0100
committerMohit Agarwal <mohit.agarwal@sky.com>2021-10-09 19:08:24 +0100
commit4d32410ba6d2bdf9b994bd889f698ba6b090c91d (patch)
tree80c3f3e09e2999ad43dcd9b0c74bb9d506b5c989 /tests/1/questions.tex
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-\begin{questions}
-
- \question Lucy records using her camera. The camera saves the
- audio and video parts of the recording seperately. Lucy transfers
- recording to her computer. The audio file has a size of 12.8 kB.
- Audio is recorded at a sample rate of 320 kB per second. The audio
- resolution is 32 bits.
-
- \begin{parts}
-
- \part[5] In minutes, how many seconds was the recording.
- \vspace{\stretch{1}}
-
- \part[5] A video file consists of many still frames. Each
- frame is a normal image. The size of a video file can
- therefore be expressed as:
-
- \begin{align*}
- \mbox{Video file size} = \mbox{Number of frames} \times
- \mbox{Size of each frame}
- \end{align*}
-
- If each frame is 1920 pixels wide and 1080 pixels high in
- resolution, and the bit depth of 24 bits, what is the file
- size of the video file.
- \vspace{\stretch{1}}
-
- \pagebreak
-
- \part[1] Lucy combines the audio and video to form a file. She
- then runs a lossy compression algorithm on the resulting file.
- What is lossy compression?
- \vspace{\stretch{1}}
-
- \part[3] The file size after compression is reduced by 20\%.
- What is the final file size?
- \vspace{\stretch{1}}
-
- \part[1] State an assumption made for part (d).
- \vspace{\stretch{1}}
-
- \end{parts}
- \droptotalpoints
-
-\end{questions}
-