ADM::Delay< F > Class Template Reference

A delay-line class. More...

Public Member Functions
	Delay (F samples, F f_design, F fs)
	Create a signal delay object. More...
	~Delay ()
F	process (const F &in_sample)
	Apply delay to signal. More...

Private Attributes
unsigned	m_fullsamples
	Integer part of delay. More...
F	m_coeff
	coefficient for 1st order IIR lowpass filter which does the subsample delay More...
F	m_norm
	normalization for the IIR subsample delay filter More...
F *	m_state
	Ringbuffer: Delayline. More...
unsigned	m_now_in
	current position for inserting new samples into m_state ringbuffer More...

Detailed Description

template<class F>
class ADM::Delay< F >

A delay-line class.

It can delay samples in a single audio channel. It stores samples while they are delayed until they have reached their target delay. It can also do subsample-delays for a limited frequency range below fs/4.

Constructor & Destructor Documentation

Delay()

template<class F >

ADM::Delay< F >::Delay	(	F	samples,
		F	f_design,
		F	fs
	)

Create a signal delay object.

Parameters

samples	number of samples to delay (may be non-integer)
f_design	design frequency (in Hz). Subsampledelay is exact for this frequency and approximate for different frequencies
fs	sampling frequency (in Hz).

~Delay()

template<class F >

ADM::Delay< F >::~Delay

Member Function Documentation

process()

template<class F >

F ADM::Delay< F >::process ( const F &  in_sample )

inline

Apply delay to signal.

Whenever a new audio sample enters the delay line, a previous audio sample, now delayed, is returned by this method. Sub-sample-delays are implemented by applying a first-order recursive lowpass filter. This method needs to be called repeatedly, once for each incoming audio sample in correct order for a block of audio with multiple samples (oldest first, newest last).

Parameters

in_sample

The current input signal sample

Returns

The output sample, which is one of the previously received input samples except for the sub-sample delay.

Member Data Documentation

m_fullsamples

template<class F >

unsigned ADM::Delay< F >::m_fullsamples

private

Integer part of delay.

m_coeff

template<class F >

F ADM::Delay< F >::m_coeff

private

coefficient for 1st order IIR lowpass filter which does the subsample delay

m_norm

template<class F >

F ADM::Delay< F >::m_norm

private

normalization for the IIR subsample delay filter

m_state

template<class F >

F* ADM::Delay< F >::m_state

private

Ringbuffer: Delayline.

m_now_in

template<class F >

unsigned ADM::Delay< F >::m_now_in

private

current position for inserting new samples into m_state ringbuffer

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

• adm.hh