Question 3 – ISRO-2018
November 27, 2023Question 5118 – UGC NET CS 2018 JUNE Paper-2
November 27, 2023Question 1719 – Image-Processing
Consider an uncompressed stereo audio signal of CD quality which is sampled at 44.1 kHz and quantized using 16 bits. What is required storage space if a compression ratio of 0.5 is achieved for 10 seconds of this audio?
Correct Answer: C
Question 4 Explanation:
Given frequency = 44.1 kHz = 44100 bits per second and compression ratio = 0.5
This is stereo audio signal, it will need 2 channels.
16 bits used for quantized (converting to MP3)
This is stereo audio signal, it will need 2 channels.
16 bits used for quantized (converting to MP3)
Bit Rate = number channels * bits* frequency =2 x16 x 44100 = 1411200 bps
Compressed Bit Rate = 0.5x 1411200= 705600 bps ( It is for one second)
For 10 seconds,
Bit rate = 10 x 705600 bits
= 7056000bits
=882000 Bytes (7056000/8 & 1 Byte =8 bits)
= 882 KB (882000/1000& 1 KB=1000 bytes)
172 KB
430 KB
860 KB
1720 KB
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