Помогите для метода разработки со спецификацией фильтра
help(d,'
designmethod
')
help(d,'
отображения помогают в командном окне для алгоритма проекта designmethod
')designmethod
для текущих спецификаций объекта спецификации фильтров d
. designmethod
должен быть одним из алгоритмов проекта, возвращенных designmethods
для d
, объекта проектирования.
Получите определенную справку для разработки lowpass Фильтры Баттерворта.
Первый фильтр lowpass использует спецификацию по умолчанию 'Fp, Fst, AP, Ast' и возвращает текст справки, характерный для спецификации.
d = fdesign.lowpass;
designmethods(d,'Systemobject',true)
Design Methods that support System objects for class fdesign.lowpass (Fp,Fst,Ap,Ast): butter cheby1 cheby2 ellip equiripple ifir kaiserwin multistage
help(d,'butter')
DESIGN Design a Butterworth IIR filter. HD = DESIGN(D, 'butter') designs a Butterworth filter specified by the FDESIGN object D, and returns the DFILT/MFILT object HD. HD = DESIGN(D, ..., 'SystemObject', true) implements the filter, HD, using a System object instead of a DFILT/MFILT object. HD = DESIGN(..., 'FilterStructure', STRUCTURE) returns a filter with the structure STRUCTURE. STRUCTURE is 'df2sos' by default and can be any of the following: 'df1sos' 'df2sos' 'df1tsos' 'df2tsos' 'cascadeallpass' 'cascadewdfallpass' Some of the listed structures may not be supported by System object filters. Type validstructures(D, 'butter', 'SystemObject', true) to get a list of structures supported by System objects. HD = DESIGN(..., 'MatchExactly', MATCH) designs a Butterworth filter and matches the frequency and magnitude specification for the band MATCH exactly. The other band will exceed the specification. MATCH can be 'stopband' or 'passband' and is 'stopband' by default. HD = DESIGN(..., 'SOSScaleNorm', NORM) designs an SOS filter and scales the coefficients using the P-Norm NORM. NORM can be either a discrete-time-domain norm or a frequency-domain norm. Valid time-domain norms are 'l1','l2', and 'linf'. Valid frequency-domain norms are 'L1','L2', and 'Linf'. Note that L2-norm is equal to l2-norm (Parseval's theorem) but the same is not true for other norms. The different norms can be ordered in terms of how stringent they are as follows: 'l1' >= 'Linf' >= 'L2' = 'l2' >= 'L1' >= 'linf'. Using the most stringent scaling, 'l1', the filter is the least prone to overflow, but also has the worst signal-to-noise ratio. Linf-scaling is the most commonly used scaling in practice. Scaling is turned off by default, which is equivalent to setting SOSScaleNorm = ''. HD = DESIGN(..., 'SOSScaleOpts', OPTS) designs an SOS filter and scales the coefficients using an FDOPTS.SOSSCALING object OPTS. Scaling options are: Property Default Description/Valid values --------- ------- ------------------------ 'sosReorder' 'auto' Reorder section prior to scaling. {'auto','none','up','down','lowpass', 'highpass','bandpass','bandstop'} 'MaxNumerator' 2 Maximum value for numerator coefficients 'NumeratorConstraint' 'none' {'none', 'unit', 'normalize','po2'} 'OverflowMode' 'wrap' {'wrap','saturate'} 'ScaleValueConstraint' 'unit' {'unit','none','po2'} 'MaxScaleValue' 'Not used' Maximum value for scale values When sosReorder is set to 'auto', the sections will be automatically reordered depending on the response type of the design (lowpass, highpass, etc.). Note that 'MaxScaleValue' will only be used when 'ScaleValueConstraint' is set to something other than 'unit'. If 'MaxScaleValue' is set to a number, the 'ScaleValueConstraint' will be changed to 'none'. Further, if SOSScaleNorm is off (as it is by default), then all the SOSScaleOpts will be ignored. For more information about P-Norm and scaling options see help for DFILT\SCALE. % Example #1 - Compare passband and stopband MatchExactly. h = fdesign.lowpass('Fp,Fst,Ap,Ast', .1, .3, 1, 60); Hd = design(h, 'butter', 'MatchExactly', 'passband'); Hd(2) = design(h, 'butter', 'MatchExactly', 'stopband'); % Compare the passband edges in FVTool. fvtool(Hd); axis([.09 .11 -2 0]);
Отметьте обсуждение опции входа MatchExactly
. Когда вы используете объект проектирования, который использует различную спецификацию, такую как and, F3dB', содержимое справки для метода разработки масла изменяется.
В этом случае опция MatchExactly не появляется в справке, потому что это не доступный входной параметр для спецификации and, F3dB'.
d = fdesign.lowpass('N,F3dB')
d = lowpass with properties: Response: 'Lowpass' Specification: 'N,F3dB' Description: {2x1 cell} NormalizedFrequency: 1 FilterOrder: 10 F3dB: 0.5000
designmethods(d,'Systemobject',true)
Design Methods that support System objects for class fdesign.lowpass (N,F3dB): butter maxflat
help(d,'butter')
DESIGN Design a Butterworth IIR filter. HD = DESIGN(D, 'butter') designs a Butterworth filter specified by the FDESIGN object D, and returns the DFILT/MFILT object HD. HD = DESIGN(D, ..., 'SystemObject', true) implements the filter, HD, using a System object instead of a DFILT/MFILT object. HD = DESIGN(..., 'FilterStructure', STRUCTURE) returns a filter with the structure STRUCTURE. STRUCTURE is 'df2sos' by default and can be any of the following: 'df1sos' 'df2sos' 'df1tsos' 'df2tsos' 'cascadeallpass' 'cascadewdfallpass' Some of the listed structures may not be supported by System object filters. Type validstructures(D, 'butter', 'SystemObject', true) to get a list of structures supported by System objects. HD = DESIGN(..., 'SOSScaleNorm', NORM) designs an SOS filter and scales the coefficients using the P-Norm NORM. NORM can be either a discrete-time-domain norm or a frequency-domain norm. Valid time-domain norms are 'l1','l2', and 'linf'. Valid frequency-domain norms are 'L1','L2', and 'Linf'. Note that L2-norm is equal to l2-norm (Parseval's theorem) but the same is not true for other norms. The different norms can be ordered in terms of how stringent they are as follows: 'l1' >= 'Linf' >= 'L2' = 'l2' >= 'L1' >= 'linf'. Using the most stringent scaling, 'l1', the filter is the least prone to overflow, but also has the worst signal-to-noise ratio. Linf-scaling is the most commonly used scaling in practice. Scaling is turned off by default, which is equivalent to setting SOSScaleNorm = ''. HD = DESIGN(..., 'SOSScaleOpts', OPTS) designs an SOS filter and scales the coefficients using an FDOPTS.SOSSCALING object OPTS. Scaling options are: Property Default Description/Valid values --------- ------- ------------------------ 'sosReorder' 'auto' Reorder section prior to scaling. {'auto','none','up','down','lowpass', 'highpass','bandpass','bandstop'} 'MaxNumerator' 2 Maximum value for numerator coefficients 'NumeratorConstraint' 'none' {'none', 'unit', 'normalize','po2'} 'OverflowMode' 'wrap' {'wrap','saturate'} 'ScaleValueConstraint' 'unit' {'unit','none','po2'} 'MaxScaleValue' 'Not used' Maximum value for scale values When sosReorder is set to 'auto', the sections will be automatically reordered depending on the response type of the design (lowpass, highpass, etc.). Note that 'MaxScaleValue' will only be used when 'ScaleValueConstraint' is set to something other than 'unit'. If 'MaxScaleValue' is set to a number, the 'ScaleValueConstraint' will be changed to 'none'. Further, if SOSScaleNorm is off (as it is by default), then all the SOSScaleOpts will be ignored. For more information about P-Norm and scaling options see help for DFILT\SCALE. % Example #1 - Design a lowpass Butterworth filter in the DF2TSOS structure. h = fdesign.lowpass('N,F3dB'); Hd = design(h, 'butter', 'FilterStructure', 'df2tsos');
design
| designmethods
| designopts
| fdesign
1. Если смысл перевода понятен, то лучше оставьте как есть и не придирайтесь к словам, синонимам и тому подобному. О вкусах не спорим.
2. Не дополняйте перевод комментариями “от себя”. В исправлении не должно появляться дополнительных смыслов и комментариев, отсутствующих в оригинале. Такие правки не получится интегрировать в алгоритме автоматического перевода.
3. Сохраняйте структуру оригинального текста - например, не разбивайте одно предложение на два.
4. Не имеет смысла однотипное исправление перевода какого-то термина во всех предложениях. Исправляйте только в одном месте. Когда Вашу правку одобрят, это исправление будет алгоритмически распространено и на другие части документации.
5. По иным вопросам, например если надо исправить заблокированное для перевода слово, обратитесь к редакторам через форму технической поддержки.