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Digital Processing of Audio Signals

Digital Processing of Audio Signals. Prasanna Vemuri Padma Parakala Rekha Vemuri. Presentation Outline. Objective Product Idea Development strategy Design Phase Alternate Approach Cost Analysis Time line Conclusions. Objective.

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Digital Processing of Audio Signals

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  1. Digital Processing of Audio Signals Prasanna Vemuri Padma Parakala Rekha Vemuri

  2. Presentation Outline • Objective • Product Idea • Development strategy • Design Phase • Alternate Approach • Cost Analysis • Time line • Conclusions

  3. Objective • The main objective of this project is to design an audio amplifier and to process the output signal using digital filtering techniques

  4. Product Idea??? What can be done to reduce noise? Which process is more suitable?

  5. Product Idea??? What are the resources available to achieve the task? • Is the product idea feasible and within the economical constraints?

  6. Development Strategy

  7. Design Phase

  8. Analog Audio Amplifier

  9. Analog to Digital Conversion ADH 0 From Output of Audio Amplifier NI BNC 2120 DAQ Board

  10. Digital Filtering

  11. Digital to Analog Conversion DAC 0 To Speaker NI BNC 2120 DAQ Board

  12. Speaker

  13. Limitations • Hissing --- Lack of Precision equipment • Time lag – Scan time for acquiring and processing the data

  14. Alternate Approach FIR Filter

  15. Alternate Approach Contd.. • To eliminate time lag -- Using scan clock -- Using case structure • To eliminate hissing -- IIR Filter with Scaled Window

  16. Cost Analysis

  17. Time Line

  18. Conclusions • Real time application of digital filtering is more efficient for the acquisitions at lower speeds • Waveform graph after filtering showed reduction in noise of the audio signal

  19. For more information Visit us at: www.cas.unt.edu/~prasanna/ELET5330

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