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Electronics Electronics Principles & Applications Principles & Applications Eighth Edition Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill ©2013 by The McGraw-Hill Companies, Inc. All rights reserved

Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

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Page 1: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

ElectronicsElectronics

Principles & ApplicationsPrinciples & ApplicationsEighth EditionEighth Edition

DSP Audio Examples(Ch. 16 supplement)

Charles A. Schuler

McGraw-Hill©2013 by The McGraw-Hill Companies, Inc. All rights

reserved

Page 2: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

Square wave before filtering

Page 3: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

Square wave after low-pass filter

Page 4: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

The GoldWave Device Controls panel

Spectrum(1 kHz square wave)

Spectrum(1 kHz sine wave)

Page 5: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

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

Page 6: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

LPF(2 kHz)

Voice Filtered Voice

Audio example (voice and low-pass filter)

Page 7: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

HPF(500 Hz)

Voice Filtered Voice

Audio example (voice and high-pass filter)

Page 8: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

BPF0.5 - 2kHz

Voice Filtered Voice

Audio example (voice and band-pass filter)

Page 9: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

Voice Voice with echo

Audio example (echo effect)

An echo effect is created by addingdelayed samples to the original signal.

Delay Delay

Page 10: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

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).

Page 11: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

Voice

Noise

Voice + Noise

Audio example (voice + noise)

LPF(2 kHz)

The noise is broad band and a LPF only helps a little.

Page 12: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

The importance of signal-to-noise ratio

Very poor

Very good

Page 13: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

Voice

Clicks

Voice + Clicks

Audio example (voice + clicks)

ClickDSP

The removal of clicks with DSP works very well.

Page 14: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

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.

Page 15: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

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.

Page 16: Electronics Principles & Applications Eighth Edition DSP Audio Examples (Ch. 16 supplement) Charles A. Schuler McGraw-Hill©2013 by The McGraw-Hill Companies,

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!


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