pulp::signal::LookupTableT< SampleType > Class Template Reference

Pre-computed function lookup table with linear interpolation. More...

#include <lookup_table.hpp>

Public Member Functions
	LookupTableT ()=default
	LookupTableT (int size, SampleType min_input, SampleType max_input, std::function< SampleType(SampleType)> generator)
	Construct with a generator function.
SampleType	process (SampleType input) const
	Look up a value with linear interpolation.
void	process (SampleType *data, int num_samples) const
	Process a buffer in-place.
SampleType	operator[] (int index) const
	Direct table access (no interpolation).
int	size () const
bool	empty () const

Detailed Description

template<typename SampleType = float>
class pulp::signal::LookupTableT< SampleType >

Pre-computed function lookup table with linear interpolation.

RT contract: construction allocates and runs the generator. process(), operator[], and size queries allocate no memory after construction.

Maps an input range [min, max] to pre-computed output values, using linear interpolation between table entries for smooth results.

// Fast tanh approximation with 1024 entries
LookupTable tanh_table(1024, -4.0f, 4.0f, [](float x) { return std::tanh(x); });
float out = tanh_table.process(input);
 
// Sine wavetable
LookupTable sine(4096, 0.0f, 1.0f, [](float phase) {
    return std::sin(phase * 2.0f * 3.14159265f);
});

Constructor & Destructor Documentation

LookupTableT() [1/2]

template<typename SampleType = float>

pulp::signal::LookupTableT< SampleType >::LookupTableT ( )

default

LookupTableT() [2/2]

template<typename SampleType = float>

pulp::signal::LookupTableT< SampleType >::LookupTableT ( int size, SampleType min_input, SampleType max_input, std::function< SampleType(SampleType)> generator )

inline

Construct with a generator function.

Parameters

size	Number of table entries.
min_input	Minimum input value.
max_input	Maximum input value.
generator	Function that maps input to output.

Member Function Documentation

empty()

template<typename SampleType = float>

bool pulp::signal::LookupTableT< SampleType >::empty ( ) const

inline

operator[]()

template<typename SampleType = float>

SampleType pulp::signal::LookupTableT< SampleType >::operator[] ( int index ) const

inline

Direct table access (no interpolation).

process() [1/2]

template<typename SampleType = float>

void pulp::signal::LookupTableT< SampleType >::process ( SampleType * data, int num_samples ) const

inline

Process a buffer in-place.

process() [2/2]

template<typename SampleType = float>

SampleType pulp::signal::LookupTableT< SampleType >::process ( SampleType input ) const

inline

Look up a value with linear interpolation.

size()

template<typename SampleType = float>

int pulp::signal::LookupTableT< SampleType >::size ( ) const

inline

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

• /home/runner/work/pulp/pulp/core/signal/include/pulp/signal/lookup_table.hpp