CLAM::MelFilterBank Class Reference

This class performs filterbank analysis for Mel Frequency Cepstrum Coefficients (MFCC) computation. More...

#include <MelFilterBank.hxx>

List of all members.

Public Member Functions

 MelFilterBank ()
 MelFilterBank (const MelFilterBankConfig &)
 ~MelFilterBank ()
bool Do ()
 Supervised mode execution method (using ports).
bool Do (const Spectrum &s, MelSpectrum &ms)
 Perform the filterbank analysis using the specified number of bands.
const ProcessingConfig & GetConfig () const
 Configuration getter.
virtual const char * GetClassName () const
 Override it in every subclass and retur the name of that class.

Protected Member Functions

virtual bool ConcreteConfigure (const ProcessingConfig &cfg)
 Configuration method interface.
TData Mel (TData linFreq)
 Linear to Mel scale transformation.
void InitializeTables ()

Detailed Description

This class performs filterbank analysis for Mel Frequency Cepstrum Coefficients (MFCC) computation.

It is designed to be compliant with similar functionality found in the speech processing software HTK v3.2.1.

No normalization or windowing of the spectrum data is performed prior to analysis.

See also:
CLAM::CepstralTransform

Definition at line 67 of file MelFilterBank.hxx.

Constructor & Destructor Documentation

CLAM::MelFilterBank::MelFilterBank (  ) 

Definition at line 48 of file MelFilterBank.cxx.

CLAM::MelFilterBank::MelFilterBank ( const MelFilterBankConfig &  cfg  ) 

Definition at line 55 of file MelFilterBank.cxx.

CLAM::MelFilterBank::~MelFilterBank (  ) 

Definition at line 62 of file MelFilterBank.cxx.

Member Function Documentation

bool CLAM::MelFilterBank::ConcreteConfigure ( const ProcessingConfig &   )  [protected, virtual]

Configuration method interface.

The Processing base class forces all the concrete classes derived from it to implement this method, which must actually perform the specific configuration tasks.

Note that the user can not call this method directly. He will use Configure instead. The argument is expected to be an object of the necesary concrete configuration class.

Parameters:
Reference to the configuration object.
Returns:
false if the object is not yet fully configured. (For example, if some important configuration attribute such as number of ports was set to zero in the config object)

true if the processing object is left in a consistent state, and can be executed.

Exceptions:
This method must throw a bad_cast exception if the argument is not an object of the expected configuration class.

Reimplemented from CLAM::Processing.

Definition at line 131 of file MelFilterBank.cxx.

bool CLAM::MelFilterBank::Do ( const Spectrum &  s,
MelSpectrum &  ms 
)

Perform the filterbank analysis using the specified number of bands.

Parameters:
s Input spectrum from FFT transform
ms Output filterbank coefficients
Returns:
True is computation was successfull, false otherwise

Definition at line 76 of file MelFilterBank.cxx.

bool CLAM::MelFilterBank::Do (  )  [virtual]

Supervised mode execution method (using ports).

Returns:
A boolean telling whether it has been output

Implements CLAM::Processing.

Definition at line 66 of file MelFilterBank.cxx.

virtual const char* CLAM::MelFilterBank::GetClassName (  )  const [inline, virtual]

Override it in every subclass and retur the name of that class.

Implements CLAM::Processing.

Definition at line 94 of file MelFilterBank.hxx.

const ProcessingConfig& CLAM::MelFilterBank::GetConfig (  )  const [inline, virtual]

Configuration getter.

Gets the configuration parameters used to create the object.

Returns:
Const reference to the configuration object. The usual way to perform a configuration change in the processing object is to take a copy of this reference, to change it and to send it with the Configure method. If not overriden, it returns a NullProcessingConfig.

Reimplemented from CLAM::Processing.

Definition at line 89 of file MelFilterBank.hxx.

void CLAM::MelFilterBank::InitializeTables (  )  [protected]

Definition at line 150 of file MelFilterBank.cxx.

TData CLAM::MelFilterBank::Mel ( TData  linFreq  )  [protected]

Linear to Mel scale transformation.

Parameters:
linFreq Frequency in Hz.
Returns:
Frequency in Mel.

Definition at line 138 of file MelFilterBank.cxx.

The documentation for this class was generated from the following files:
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