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Introduction to Digital Audio

Introduction to Digital Audio. Objectives. Explain the difference between analog and digital signals Identify audio sampling standards Describe audio sampling variables Determine how variables affect file size and quality. Analog vs. Digital Signals. Analog –

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Introduction to Digital Audio

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  1. Introduction toDigital Audio

  2. Objectives • Explain the difference between analog and digital signals • Identify audio sampling standards • Describe audio sampling variables • Determine how variables affect file size and quality

  3. Analog vs. Digital Signals Analog – • A continuously recorded sine wave signal usually recorded on a magnetic medium

  4. Analog vs. Digital Signals Digital – • A signal that samples specified portions of a signal resulting in discrete digital information (i.e. bits of data) “Sampled” discrete data

  5. Audio Sampling Variables • Three main criteria: • How many samples? OR “sampling rate” • How much data per sample? OR “bit depth” • How many channels sampled?

  6. How Many Samples?Audio “Sampling Rates” • Digital Video • CD Quality • Stereo • FM Radio • AM Radio • Telephone

  7. How Many Samples?Audio “Sampling Rates” • Digital Video • 48,000 per sec • 32,000 per sec

  8. How Many Samples?Audio “Sampling Rates” • CD Quality • 44,100 per sec • Left & Right • Channels Combined

  9. Sample Rate Quality Less 8000 Telephone 11000 AM Radio 16000 FM Radio 22050 per Stereo Typical Sample Rates: Other Sample Rates

  10. How Much Dataper Sample? • Common Sampling “Bit Depth” • 8 bits of data per sample • 16 bits of data per sample

  11. How Many Channels Sampled? • Number of Channels • Stereo (2 channels) • Mono (1 channel) • Multiple tracks

  12. Audio Sampling Variables Quality File Size Digital Audio

  13. Record Settings Sound Quality File Size Sample Rate Bit Depth Number of Channels Audio Sampling Variables Balance

  14. Larger Audio Files More Audio Samples Audio Record Rate

  15. Sample Rate Bit Depth No of Channels File size is determined by a combination of: Audio File Size

  16. Sample Rate Bit Depth No of Channels File size is determined by a combination of: Audio File Size Length in Minutes

  17. Various Sample Rates 8 bit or 16 bit Stereo or Mono Length in Minutes Audio File Size Variables of concern:

  18. Cool Edit 96 Shareware from Syntrillium Software www.syntrillium.com

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