TB308.1 order maximize effectiveness DECIMATE software there desi

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HSP43220 DECIMATEDesign Rule Checks
TB308.1
order maximize effectiveness DECIMATE software there design rule checks that need some depth discussion. Once these crosschecks understood usefulness DECIMATE will improve because filters that were previously thought unrealizable fact achievable. Consider following normalized response first null). Figure dotted line represents aliasing. point defined stopband attenuation (50dB) passband transitionband frequencies, must cross dotted line. Sometimes MANUAL design mode will come upon filter which vary either transitionband passband frequencies attenuation just find filter jumps from unrealizable many taps viable filter that only needs taps. This crossing aliasing curve. This effect, renders ineffective DECIMATE trying accomplish everything FIR. also error message "HDF unrealizable".
PASSBAND TRANSITION BAND
MAGNITUDE (dB)
PASSBAND
DESIRED RESPONSE
FREQ RESPONSE
FIGURE
important user understand which rule being violated because first hard fast must violated. second correctable with additional work (manual design other software). course possible that both rules being broken. There simple tests that done identify what problem difficulty with rolloff passband (rule then relaxing passband attenuation will allow software generate filter. problem intrusion stopband attenuation past dotted line (rule then changing passband attenuation will solve anything. reducing stopband attenuation, little, then lot, this results filter design, then problem rule
Solutions
MAGNITUDE (DB)
FREQ RESPONSE
DECIMATE design mode MANUAL when problem occurred, then user adjust design parameters (input rate, output rate, passband, transition band, passband attenuation, stopband), filter parameters achieve filter. problems with rule following: higher input rate, narrower passband, less stopband attenuation, less decimation, more stages. problems with rule following: higher input rate, higher output rate, narrower passband, looser passband attenuation, less decimation, fewer stages. general, DECIMATE design mode AUTO when problem occurred, then going manual design mode playing with stages, decimation will produce better results (with exception noted below "Special Case"). user then must decide system tolerate relaxed design parameters (input rate, output rate, passband, transition band, passband attenuation, stopband attenuation) needed achieve realizable filter. not, user will need perform manual design filter parameters.
FIGURE
Violation second rule exhibits similar symptoms. Figure illustrates design rule check that rolloff should violate passband attenuation spec. This condition occur variety ways, passband large percentage output rate; passband attenuation very small; most decimation being done (which brings first null response close passband region). number stages also determines rolloff response. This design rule check done with knowledge type being used, STANDARD, IMPORTED, PRECOMP. Therefore, switching PRECOMP, IMPORTED will alleviate violation this rule. PRECOMP fact, reduce rolloff effect when rolloff within limits stated above.
Special Case
those users have option system decimation rates there some alternatives. those with system decimation rates less than trying varying combinations decimation stages prove worth while. Also, those that have system decimation less, bypassing (setting decimation stages using only beneficial.
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