sbl::dsp::primitives::ThiranAllpass< N > Class Template Reference

Order-N Thiran allpass: fractional delay by phase, not interpolation. More...

Detailed Description

template<uint8_t N = 1>
class sbl::dsp::primitives::ThiranAllpass< N >

Order-N Thiran allpass: fractional delay by phase, not interpolation.

Template Parameters

N	Filter order; the delay it can express is N ± 0.5 samples.

Note

All public methods are ISR-safe — bounded computation, no I/O.

Definition at line 56 of file thiran_allpass.hpp.

#include <thiran_allpass.hpp>

Inheritance diagram for sbl::dsp::primitives::ThiranAllpass< N >:

Public Member Functions
	ThiranAllpass ()
void	set_delay (float delay_samples)
	Set the total phase delay in samples.
float	process (float x)
	Process one sample.
float	group_delay_samples () const
	Phase delay the filter is tuned to, in samples (flat at DC by design).
void	reset ()

Static Public Member Functions
static constexpr uint8_t	order ()
static constexpr float	min_delay ()
	Smallest and largest delay this order can express.
static constexpr float	max_delay ()

Constructor & Destructor Documentation

ThiranAllpass()

template<uint8_t N = 1>

sbl::dsp::primitives::ThiranAllpass< N >::ThiranAllpass ( )

inline

Definition at line 61 of file thiran_allpass.hpp.

References sbl::dsp::primitives::ThiranAllpass< N >::set_delay().

Member Function Documentation

set_delay()

template<uint8_t N = 1>

void sbl::dsp::primitives::ThiranAllpass< N >::set_delay ( float  delay_samples )

inline

Set the total phase delay in samples.

Clamped to [N - 0.5, N + 0.5]. Coefficients are recomputed here, so call it when the pitch changes (block rate), not per sample.

Definition at line 69 of file thiran_allpass.hpp.

References sbl::dsp::primitives::detail::binomial(), and sbl::dsp::math::clamp().

Referenced by sbl::dsp::primitives::ThiranAllpass< N >::ThiranAllpass().

process()

template<uint8_t N = 1>

float sbl::dsp::primitives::ThiranAllpass< N >::process ( float  x )

inline

Process one sample.

Numerator coefficients are the denominator's, reversed — that is what makes the magnitude response unity.

Definition at line 92 of file thiran_allpass.hpp.

Referenced by sbl::dsp::pm::StringLoop::tick().

group_delay_samples()

template<uint8_t N = 1>

float sbl::dsp::primitives::ThiranAllpass< N >::group_delay_samples ( ) const

inline

Phase delay the filter is tuned to, in samples (flat at DC by design).

Definition at line 112 of file thiran_allpass.hpp.

Referenced by sbl::dsp::pm::StringLoop::allpass_delay_samples(), and sbl::dsp::pm::StringLoop::describe().

reset()

template<uint8_t N = 1>

void sbl::dsp::primitives::ThiranAllpass< N >::reset ( )

inline

Definition at line 114 of file thiran_allpass.hpp.

Referenced by sbl::dsp::pm::StringLoop::reset().

order()

template<uint8_t N = 1>

static constexpr uint8_t sbl::dsp::primitives::ThiranAllpass< N >::order ( )

inlinestaticconstexpr

Definition at line 121 of file thiran_allpass.hpp.

min_delay()

template<uint8_t N = 1>

static constexpr float sbl::dsp::primitives::ThiranAllpass< N >::min_delay ( )

inlinestaticconstexpr

Smallest and largest delay this order can express.

Definition at line 124 of file thiran_allpass.hpp.

max_delay()

template<uint8_t N = 1>

static constexpr float sbl::dsp::primitives::ThiranAllpass< N >::max_delay ( )

inlinestaticconstexpr

Definition at line 125 of file thiran_allpass.hpp.

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

• src/sbl/dsp/primitives/thiran_allpass.hpp