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Electronics Principles & Applications Seventh Edition

Electronics Principles & Applications Seventh Edition. Charles A. Schuler. DSP Audio Examples (Ch. 16 supplement). The audio examples in this presentation were prepared using the GoldWave digital audio editor version 4.26. (www.goldwave.com). Click this icon to verify

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Electronics Principles & Applications Seventh Edition

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  1. Electronics Principles & Applications Seventh Edition Charles A. Schuler DSP Audio Examples (Ch. 16 supplement)

  2. The audio examples in this presentation were prepared using the GoldWave digital audio editor version 4.26. (www.goldwave.com) Click this icon to verify that your sound works.

  3. Square wave before filtering

  4. Square wave after low-pass filter

  5. The GoldWave Device Controls panel Spectrum (1 kHz square wave) Spectrum (1 kHz sine wave)

  6. Audio example (square wave and filters) The low-pass filter attenuates all harmonics higher than the 1st (the fundamental). The high-pass filter passes the 7th harmonic and all those above. The band-pass filter passes the 5th harmonic 400 Hz Square wave Filtered wave (sine) LPF (500 Hz) HPF (2.7 kHz) Filtered wave BPF (2.0 kHz) Filtered wave (sine) Click the speaker icons to hear the sounds.

  7. Audio example (voice and low-pass filter) LPF (2 kHz) Voice Filtered Voice

  8. Audio example (voice and high-pass filter) HPF (500 Hz) Voice Filtered Voice

  9. Audio example (voice and band-pass filter) BPF 0.5 - 2 kHz Voice Filtered Voice

  10. Audio example (echo effect) Delay Delay Voice Voice with echo An echo effect is created by adding delayed samples to the original signal.

  11. Audio example (voice and reverse effect) Reverse Voice Reversed Voice The reverse effect flips the end of the sampled signal with the beginning (thus it plays backwards).

  12. Audio example (voice + noise) Noise Voice Voice + Noise LPF (2 kHz) The noise is broad band and a LPF only helps a little.

  13. The importance of signal-to-noise ratio Very good Very poor

  14. Audio example (voice + clicks) Clicks Voice Voice + Clicks Click DSP The removal of clicks with DSP works very well.

  15. Audio example (voice + 1 kHz sine) 1 kHz sine Voice Voice + 1 kHz sine BSF (1 kHz) The removal of an interfering tone with a band-stop filter works very well but there is some ringing.

  16. Audio example (voice and special effects) Pitch higher Voice Altered Voice Pitch lower Altered Voice The pitch is changed by clocking the data to the D/A converter at a faster or slower rate.

  17. Audio example (400 Hz square wave and special effects) 400 Hz square wave SE #1 SE #2 SE #3 SE #4 If you can imagine it, DSP can probably do it!

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