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Chapter 26: Design Examples
26–7
The example model is topiir.mdl.
32 Tap Serial FIR Filter
Open this model
This design example illustrates how to implement a low pass 32 tap FIR (finite
impulse response) filter with a 4-8 look-up table (LUT) for partial product
pre-computation. This design requires the Mathworks Signal Processing ToolBox to
calculate the coefficient with the FIR1 function:
FilterOrder = 32
InputBitWidth = 8
LowPassFreqBand = [0 0.1 0.2 1];
LowPassMagnBand = [1 0.9 0.0001 0.0001];
FlCoef = firls(FilterOrder,LowPassFreqBand,LowPassMagnBand);
CoefBitWidth = InputBitWidth +
ceil(log2((max(abs(FlCoef))/min(abs(FlCoef)))))
ScalingFactor = (2^(CoefBitWidth-1))-1;
FpCoef = fix(ScalingFactor * FlCoef);
plot(FpCoef,'o');
title('Fixed-point scaled coefficient value');
ImpulseData = zeros(1,1000);
ImpulseData(1) = 100;
h = conv(ImpulseData,FpCoef);
fftplot(h);
title('FIR Frequency response');
FirSamplingPeriod=1;
The example model is AltrFir32.mdl .
MAC based 32 Tap FIR Filter
Open this model
This design example illustrates how to implement a MAC-based, fixed-coefficient,
32-tap, low pass FIR (finite impulse response) filter with a single Multiply
Accumulate block and a single memory element for the tap delay line. This design
requires the MathWorks Signal Processing ToolBox to calculate the coefficient with the
fir1 function:
coef = fix(fir1(32,3/8)*2^16-1);
Impulse = zeros(1,1000);
Impulse(1) = 1;
h = conv(coef,Impulse);
plot(coef,'o');
title('Fixed-point scaled coefficient value');
fftplot(h);
title('Impulse Frequency response');
The example model is FIR_MAC32.mdl .
Color Space Converter
Open this model
This design example illustrates how to implement a color space converter, which
converts R'G'B to Y'C'bCr.
The example model is TopCsc.mdl .
November 2013
Altera Corporation
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
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