• Template
• Discussion
• View source
• History

• Main Page
• Classes
• Resources
• Community portal
• Current events
• Recent changes
• Random page
• Help
• IAM home
• IAM blogs
• Columbia home
• MediaWiki home

Sampling theory

sampling process

Quantization Error

Difference between the actual analog value and the quantized digital value due to rounding (or truncating)

aka signal to error ratio

• http://en.wikipedia.org/wiki/Quantization_error
• Dither
  • http://en.wikipedia.org/wiki/Dithering#Digital_audio

Aliasing

Error due to under sampling

Nyquist Sampling Rate  = 2 * highest frequency

• http://en.wikipedia.org/wiki/Nyquist_rate
• http://www.dsptutor.freeuk.com/aliasing/AD102.html
• http://en.wikipedia.org/wiki/Wagon-wheel_effect
• http://en.wikipedia.org/wiki/Nyquist_frequency

Jitter

Time synchronization error

Bit Depth

over 24 bit used mainly for internal processing and really high end audio equipment 24 bit Professional recording and internal processing 16 bit CD quality audio (not so good for processing) 8 bit Smaller size used for consumer voice stuff and multimedia