MHAFilter::o1_ar_filter_t Class Reference

First order attack-release lowpass filter. More...

Inheritance diagram for MHAFilter::o1_ar_filter_t:

Public Member Functions
	o1_ar_filter_t (unsigned int channels, mha_real_t fs=1.0f, std::vector< mha_real_t > tau_a=std::vector< float >(1, 0.0f), std::vector< mha_real_t > tau_r=std::vector< float >(1, 0.0f))
	Constructor, setting all taus to zero. More...
void	set_tau_attack (unsigned int ch, mha_real_t tau)
	Set the attack time constant. More...
void	set_tau_release (unsigned int ch, mha_real_t tau)
	Set the release time constant. More...
mha_real_t	operator() (unsigned int ch, mha_real_t x)
	Apply filter to value x, using state channel ch. More...
void	operator() (const mha_wave_t &in, mha_wave_t &out)
	Apply filter to a mha_wave_t data. More...
Public Member Functions inherited from MHASignal::waveform_t
	waveform_t (const unsigned int &frames, const unsigned int &channels)
	constructor of waveform_t More...
	waveform_t (const mhaconfig_t &cf)
	Constructor to create a waveform from plugin configuration. More...
	waveform_t (const mha_wave_t &src)
	Copy contructor for mha_wave_t source. More...
	waveform_t (const MHASignal::waveform_t &src)
	Copy contructor. More...
	waveform_t (const std::vector< mha_real_t > &src)
	Copy contructor for std::vector<mha_real_t> source. More...
virtual	~waveform_t (void)
std::vector< mha_real_t >	flatten () const
	operator std::vector< mha_real_t > () const
void	operator= (const mha_real_t &v)
mha_real_t &	operator[] (unsigned int k)
const mha_real_t &	operator[] (unsigned int k) const
mha_real_t &	value (unsigned int t, unsigned int ch)
	Element accessor. More...
mha_real_t &	operator() (unsigned int t, unsigned int ch)
	Element accessor. More...
const mha_real_t &	value (unsigned int t, unsigned int ch) const
	Constant element accessor. More...
const mha_real_t &	operator() (unsigned int t, unsigned int ch) const
	Constant element accessor. More...
mha_real_t	sum (const unsigned int &a, const unsigned int &b)
	sum of all elements between [a,b) in all channels More...
mha_real_t	sum (const unsigned int &a, const unsigned int &b, const unsigned int &ch)
	sum of all elements between [a,b) in channel ch More...
mha_real_t	sum ()
	sum of all elements More...
mha_real_t	sumsqr ()
	sum of square of all elements More...
mha_real_t	sum_channel (const unsigned int &)
	return sum of all elements in one channel More...
void	assign (const unsigned int &k, const unsigned int &ch, const mha_real_t &val)
	set frame "k" in channel "ch" to value "val" More...
void	assign (const mha_real_t &)
	set all elements to value More...
void	assign_frame (const unsigned int &k, const mha_real_t &val)
	assign value "val" to frame k in all channels More...
void	assign_channel (const unsigned int &c, const mha_real_t &val)
	assign value "val" to channel ch in all frames More...
void	copy (const std::vector< mha_real_t > &v)
void	copy (const mha_wave_t &)
	copy data from source into current waveform More...
void	copy (const mha_wave_t *)
void	copy_channel (const mha_wave_t &, unsigned int, unsigned int)
	Copy one channel of a given waveform signal to a target channel. More...
void	copy_from_at (unsigned int, unsigned int, const mha_wave_t &, unsigned int)
	Copy part of the source signal into part of this waveform object. More...
void	export_to (mha_wave_t &)
	copy data into allocated mha_wave_t structure More...
void	limit (const mha_real_t &min, const mha_real_t &max)
	limit target to range [min,max] More...
void	power (const waveform_t &)
	transform waveform signal (in Pa) to squared signal (in W/m^2) More...
void	powspec (const mha_spec_t &)
	get the power spectrum (in W/m^2) from a complex spectrum More...
void	scale (const unsigned int &a, const unsigned int &b, const unsigned int &ch, const mha_real_t &val)
	scale section [a,b) in channel "ch" by "val" More...
void	scale (const unsigned int &k, const unsigned int &ch, const mha_real_t &val)
	scale one element More...
void	scale_channel (const unsigned int &, const mha_real_t &)
	scale one channel of target with a scalar More...
void	scale_frame (const unsigned int &, const mha_real_t &)
unsigned int	get_size () const

Protected Attributes
MHASignal::waveform_t	c1_a
MHASignal::waveform_t	c2_a
MHASignal::waveform_t	c1_r
MHASignal::waveform_t	c2_r
mha_real_t	fs

Additional Inherited Members
Public Attributes inherited from mha_wave_t
mha_real_t *	buf
	signal buffer More...
unsigned int	num_channels
	number of channels More...
unsigned int	num_frames
	number of frames in each channel More...
mha_channel_info_t *	channel_info
	detailed channel description More...

Detailed Description

First order attack-release lowpass filter.

This filter is the base of first order lowpass filter, maximum tracker and minimum tracker.

Constructor & Destructor Documentation

o1_ar_filter_t()

MHAFilter::o1_ar_filter_t::o1_ar_filter_t	(	unsigned int	channels,
		mha_real_t	fs = 1.0f,
		std::vector< mha_real_t >	tau_a = std::vector<float>(1,0.0f),
		std::vector< mha_real_t >	tau_r = std::vector<float>(1,0.0f)
	)

Constructor, setting all taus to zero.

The filter state can be accessed through the member functions of MHASignal::waveform_t.

Parameters

channels	Number of independent filters
fs	Sampling rate (optional, default = 1)
tau_a	Attack time constants (optional, default = 0)
tau_r	Release time constants (optional, default = 0)

Member Function Documentation

set_tau_attack()

void MHAFilter::o1_ar_filter_t::set_tau_attack	(	unsigned int	ch,
		mha_real_t	tau
	)

Set the attack time constant.

Parameters

ch	Channel number
tau	Time constant

set_tau_release()

void MHAFilter::o1_ar_filter_t::set_tau_release	(	unsigned int	ch,
		mha_real_t	tau
	)

Set the release time constant.

Parameters

ch	Channel number
tau	Time constant

operator()() [1/2]

mha_real_t MHAFilter::o1_ar_filter_t::operator() ( unsigned int  ch, mha_real_t  x  )

inline

Apply filter to value x, using state channel ch.

Parameters

ch	Cannel number
x	Input value

Returns

Output value

operator()() [2/2]

void MHAFilter::o1_ar_filter_t::operator() ( const mha_wave_t &  in, mha_wave_t &  out  )

inline

Apply filter to a mha_wave_t data.

Parameters

in	Input signal
out	Output signal

The number of channels must match the number of filter bands.

Member Data Documentation

c1_a

MHASignal::waveform_t MHAFilter::o1_ar_filter_t::c1_a

protected

c2_a

MHASignal::waveform_t MHAFilter::o1_ar_filter_t::c2_a

protected

c1_r

MHASignal::waveform_t MHAFilter::o1_ar_filter_t::c1_r

protected

c2_r

MHASignal::waveform_t MHAFilter::o1_ar_filter_t::c2_r

protected

fs

mha_real_t MHAFilter::o1_ar_filter_t::fs

protected

---

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

• mha_filter.hh
• mha_filter.cpp