Audio effects

					Hello

Hello Hello

Audio Effects:

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Hello Hello

Hardware:
DSP Starters Kit(DSK) 5510:
• 200 MHz TMS320VC5510 DSP • AIC23 Stereo Codec • Four Position User DIP Switch and Four User LEDs • On-board Flash and SDRAM

Software:
• MATLAB • Code Composer Studio(CCS) by Texas Instruments • LABView

Basic types of effects:
• • • • Delay based effects: Echo, Reverb, Phasing, Flanging Filtering effects: Phasing, Flanging, Wah-Wah, Equalization Modulation based effects: Ring Modulation Non-Linear Processing: Compression/Limiting

Delay Based Effect:
Delay range (ms) • 0 ... 15 • 10 ... 25 • > 50 • Delayline I Effect name Flanging Chorus Echo

Wah-Wah !
• Single band pass filter whose centre frequency can be controlled and varied anywhere in the audio frequency spectrum.

Ring Modulator:
• Creates Unusual Sound. Ringing sound or 'gong-like' sound. • Output is sum and difference of input. • In Fig.2. (a) 400 Hz (b) 600 Hz (c) 200 & 1000 Hz

Compressor:
• Variable Gain Device. • Louder Signals are Amplified less. • Audio recording, production work, noise reduction, and live performance applications.

Filter Design
for (i=0; i < order; i++) x[i] = x[i+1];

x[order] = leftsample;
w=0; for (i=0; i<=order; i++) w += x[order-i]*b[i]; for (i=0; i<order; i++) y[i] = y[i+1]; y[order] = 0; for (i=1; i<= order; i++) y[order] += y[order - i] * a[i]; y[order] +=w; leftsample = y[order];

Direct Form I realization

Thank you


				
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posted:7/28/2009
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Description: Effects its types and theory