electronics principles & applications sixth edition dsp audio examples (ch. 16 supplement)...
TRANSCRIPT
![Page 1: Electronics Principles & Applications Sixth Edition DSP Audio Examples (Ch. 16 supplement) ©2003 Glencoe/McGraw-Hill Charles A. Schuler](https://reader030.vdocument.in/reader030/viewer/2022012902/56649cc15503460f9498867e/html5/thumbnails/1.jpg)
ElectronicsElectronics
Principles & ApplicationsPrinciples & ApplicationsSixth EditionSixth Edition
DSP Audio Examples(Ch. 16 supplement)
©2003 Glencoe/McGraw-Hill
Charles A. Schuler
![Page 2: Electronics Principles & Applications Sixth Edition DSP Audio Examples (Ch. 16 supplement) ©2003 Glencoe/McGraw-Hill Charles A. Schuler](https://reader030.vdocument.in/reader030/viewer/2022012902/56649cc15503460f9498867e/html5/thumbnails/2.jpg)
The audio examples in this presentation were preparedusing the GoldWave digital audio editor version 4.26.
(www.goldwave.com)
Click this icon to verifythat your sound works.
![Page 3: Electronics Principles & Applications Sixth Edition DSP Audio Examples (Ch. 16 supplement) ©2003 Glencoe/McGraw-Hill Charles A. Schuler](https://reader030.vdocument.in/reader030/viewer/2022012902/56649cc15503460f9498867e/html5/thumbnails/3.jpg)
Square wave before filtering
![Page 4: Electronics Principles & Applications Sixth Edition DSP Audio Examples (Ch. 16 supplement) ©2003 Glencoe/McGraw-Hill Charles A. Schuler](https://reader030.vdocument.in/reader030/viewer/2022012902/56649cc15503460f9498867e/html5/thumbnails/4.jpg)
Square wave after low-pass filter
![Page 5: Electronics Principles & Applications Sixth Edition DSP Audio Examples (Ch. 16 supplement) ©2003 Glencoe/McGraw-Hill Charles A. Schuler](https://reader030.vdocument.in/reader030/viewer/2022012902/56649cc15503460f9498867e/html5/thumbnails/5.jpg)
The GoldWave Device Controls panel
Spectrum(1 kHz square wave)
Spectrum(1 kHz sine wave)
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HPF(2.7 kHz)
LPF(500 Hz)
400 HzSquarewave
Filtered wave(sine)
Audio example (square wave and filters)
Click the speaker icons to hear the sounds.
The low-pass filter attenuates all harmonicshigher than the 1st (the fundamental).
Filtered wave
The high-pass filter passes the 7th harmonicand all those above.
BPF(2.0 kHz)
Filtered wave(sine)
The band-pass filter passes the 5th harmonic
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LPF(2 kHz)
Voice Filtered Voice
Audio example (voice and low-pass filter)
![Page 8: Electronics Principles & Applications Sixth Edition DSP Audio Examples (Ch. 16 supplement) ©2003 Glencoe/McGraw-Hill Charles A. Schuler](https://reader030.vdocument.in/reader030/viewer/2022012902/56649cc15503460f9498867e/html5/thumbnails/8.jpg)
HPF(500 Hz)
Voice Filtered Voice
Audio example (voice and high-pass filter)
![Page 9: Electronics Principles & Applications Sixth Edition DSP Audio Examples (Ch. 16 supplement) ©2003 Glencoe/McGraw-Hill Charles A. Schuler](https://reader030.vdocument.in/reader030/viewer/2022012902/56649cc15503460f9498867e/html5/thumbnails/9.jpg)
BPF0.5 - 2kHz
Voice Filtered Voice
Audio example (voice and band-pass filter)
![Page 10: Electronics Principles & Applications Sixth Edition DSP Audio Examples (Ch. 16 supplement) ©2003 Glencoe/McGraw-Hill Charles A. Schuler](https://reader030.vdocument.in/reader030/viewer/2022012902/56649cc15503460f9498867e/html5/thumbnails/10.jpg)
Voice Voice with echo
Audio example (echo effect)
An echo effect is created by addingdelayed samples to the original signal.
Delay Delay
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ReverseVoice Reversed Voice
Audio example (voice and reverse effect)
The reverse effect flips the end ofthe sampled signal with the beginning
(thus it plays backwards).
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Voice
Noise
Voice + Noise
Audio example (voice + noise)
LPF(2 kHz)
The noise is broad band and a LPF only helps a little.
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The importance of signal-to-noise ratio
Very poor
Very good
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Voice
Clicks
Voice + Clicks
Audio example (voice + clicks)
ClickDSP
The removal of clicks with DSP works very well.
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BSF(1 kHz)
Voice
1 kHz sine
Voice + 1 kHz sine
Audio example (voice + 1 kHz sine)
The removal of an interfering tone with a band-stopfilter works very well but there is some ringing.
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Pitchhigher
Voice Altered Voice
Audio example (voice and special effects)
Pitchlower Altered Voice
The pitch is changed by clocking the datato the D/A converter at a faster or slower rate.
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SE #1400 Hz
square wave
Audio example (400 Hz square wave and special effects)
SE #2
SE #3
SE #4
If you can imagine it, DSP can probably do it!