Audio data Skills: Set sample size and rate in Audacity IT concepts: analog to digital conversion, digital to analog conversion, sample rate, sample size,

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Presentation transcript:

Audio data Skills: Set sample size and rate in Audacity IT concepts: analog to digital conversion, digital to analog conversion, sample rate, sample size, quality-file size trade off This work is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 License.

Where does this topic fit? Internet concepts –Applications –Technology (electronics) –Implications Internet skills –Application development –Content creation (audio)

Analog to digital converter Digital to analog converter Recording and playing sound Computer (150) (201) (199) … Computer (150) (201) (199) …

Zoom in – it is connected dots

9 samples in.0002 seconds 45,000 samples per second Sampling rate of 45 kHz

Increase sample rate → quality ↑ file size ↑

Each sample produces a number 45,000 numbers every second But How big (how many bits) is each number?

Increase sample size → quality ↑ file size ↑ (Sample “size” and sample “depth” mean the same thing).

Edit > Preferences > Quality Set default sample rate and size

Set sample rate and size

Where does this topic fit? Internet concepts –Applications –Technology (electronics) –Implications Internet skills –Application development –Content creation (audio)

A few questions At a sampling rate of 8, bit mono samples per second, what would be the file size for a one minute recording? How much larger would a stereo recording be? How much larger would the file size be if we were to sample at 48,000 samples per second? How much larger would the file size be if the samples were 32 bits each?