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Monitoring Volume Level Application - End of Project Presentation

Monitoring Volume Level Application - End of Project Presentation . Made by : Roi Abecasis Maxim Meltsin Supervisor : Boaz Mizrahi. Contents Table. Previous Project Project goals Project milestones System demonstration. The Previous Project.

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Monitoring Volume Level Application - End of Project Presentation

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  1. Monitoring Volume Level Application - End of Project Presentation Made by: Roi Abecasis Maxim Meltsin Supervisor: Boaz Mizrahi

  2. Contents Table • Previous Project • Project goals • Project milestones • System demonstration

  3. The Previous Project Multi-Sensors Personal Digital Assistant (PDA) By: Aviv Rosenberg & Ben-Ami Zilber

  4. The Previous Project TOP LEVEL INPUTS: OUTPUTS:

  5. Project Goals • Automatic TV volume control • Keeping TV volume on given level • Detecting significant volume changes and acting accordingly • Implementation of Universal TV Remote Controller (optional)

  6. Project Milestones Part A: Microphone • debugging microphone circuit • Processing microphone samples • Implementing an algorithm for AGC

  7. Project Milestones Part B: Infra Red • Learning existing IR Protocols (RC5, NEC,..) • Detecting IR protocols frequencies • Implementing functions for decoding IR messages • Implementing functions for transmission

  8. The algorithm Goal: • Finding reliable and stable method to measure volume level changes Problems: • Overcoming sensitivity for short but intense sounds • Avoiding ‘quiet’ samples • Typical TV Broadcasting volume is very inhomogeneous

  9. The algorithm Solutions: • Measuring maximal value in time segment: new sample = max{sample(i)} , i=1,…,20 2. Averaging samples as follows: new avg = new sample + old avg 3. Throwing samples which are below certain value

  10. The algorithm Implementation: • calculating stable value by sampling and averaging 2. Setting higher and lower thresholds values as app. 2% higher and lower then stable average value 3. An act is taken whenever a deviation from threshold values is detected

  11. The algorithm New value > max => decreasing volume Start: Setting higher and lower thresholds Finding stable value Sample Otherwise do nothing New value < min => increasing volume

  12. NEC: f=38 kHz Two Main Infra Red Protocols RC5: f=36 kHz

  13. Implementation of different IR protocols issues • Different Carry Frequencies • Different ‘0’ and ‘1’ bit representation • Different Start Sequence • Toggle bit and repeat pulse • Different bits number

  14. System demonstration Universal Learning IR Remote Control Automatic Control of TV volume

  15. Throughout work Presenting signal on screend decoding:

  16. PDA Respond for 1KHz sinus wave

  17. System demonstration National geographic channel: Channel 2: Channel 10:

  18. System demonstration Universal Learning IR Remote Control Automatic Control of TV volume

  19. Resource Usage CPU Usage: • About 0.3% for average volume detecting • About 1.1% in transmitting mode • Typical total average usage = 0.3% Memory Usage: Less than 1Kbytes

  20. Special Thanks to: • Boaz Mizrahi – Supervisor • BruriaZohar – Lab technician

  21. THE END

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