MULTIMEDIA AND QUALITY OF SERVICE
COMPRESSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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44, 100 Hz
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88, 200 Hz
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22, 100 Hz
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None of the above
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Detailed explanation-1: -Analog audio is often recorded by sampling it 44, 100 times per second, and then these samples are used to reconstruct the audio signal when playing it back. The 44.1 kHz audio sampling rate is widely used due to the compact disc (CD) format, dating back to its use by Sony from 1979.
Detailed explanation-2: -44, 100 Hz (44.1 kHz) is the sampling rate of audio CDs giving a 20 kHz maximum frequency. 20 kHz is the highest frequency generally audible by humans, so making 44, 100 Hz the logical choice for most audio material.
Detailed explanation-3: -Most digital audio has a sampling rate of 44.1kHz, which is also the sampling rate for audio CDs. This means that the audio is sampled 44, 100 times per second during recording.
Detailed explanation-4: -A bit depth of 16-bit for a sample rate of 44.1kHz is enough to reproduce the audible frequency and dynamic range for the average person, which is why it became the standard CD format.