Compressing Sound

Kbps & Hz's

Audio Bitrate

Audio quality improves with increasing bitrate.

32 kbps - generally acceptable only for speech

96 kbps - generally used for speech or low-quality streaming

128 or 160 kbps – mid-range bitrate quality

192 kbps - a commonly used high-quality bitrate

320 kbps - highest level supported by MP3 standard

And means bits per second

Audio Sampling Rate

Audio quality improves with increasing sampling rate.

In digital audio the most common sampling rates are 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz and 192 kHz.

Questions

What is sampling?

Sampling is taking samples at different points in an analog wave. The higher sample rate the higher quality (more smooth wave)

What effect does it have on size and quality?

The lower sample rate can lower the quality causing the file size to decrease becasue of less sample points.

What is bit rate?

Bit rate is the bits per second. the higher the bit rate the higher the quality it keeps from the original and the lower produces lower quality.

What effect does it have on size and quality?

The less bits per second will decrease the file size and quality

How can audio be represented in binary?

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