fixed point NCO - numerically controlled oscillator
Core function: SIM::nco.process()
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Inheritance diagram for SIM::nco:

Public Member Functions
	nco ()

	~nco ()

void	set_N (int n)

void	set_acc (double a)

void	set_output (const vec &yout)

int	get_N ()

double	get_acc ()

vec	get_output ()

mat	process (const bvec &ce, const vec &x)

Detailed Description

fixed point NCO - numerically controlled oscillator
Core function: SIM::nco.process()

Accumulated phase is in Q1.N format, operational type is Q(64-N).N
input vector x [vec] is frequency control word
fcw is saturated at (-1..+1) and converted from fractional double to Q1.N fixed point
nco output is a matrix mat=[cy|ph] where:
cy is overflow flag: +1 for positive -1 for negative
ph is accumulated phase converted to double fractional format

Constructor & Destructor Documentation

SIM::nco::nco ( )

inline

SIM::nco::~nco ( )

inline

Member Function Documentation

double SIM::nco::get_acc ( void )

get state of phase accumulator converted to double fractional format

int SIM::nco::get_N ( void )

get N - number of bits for fractional representation in Q1.N

vec SIM::nco::get_output ( void )

get initial output value y0

mat SIM::nco::process	(	const bvec &	ce,
		const vec &	x
	)

process input samples - x[i] for active clock ticks ce[i]

Parameters

ce	- bvec - clock enable vector
x	- vec - input vector - fcw saturated at (-1..+1) in double fractional format

Returns: y - mat - output matrix [cy|ph] cy =(1,0,-1), ph - accumulated phase in double fractional format

void SIM::nco::set_acc ( double a )

set state of phase accumulator

Parameters

[in] a - state of phase accumulator in double fractional format

void SIM::nco::set_N ( int n )

set N - number of bits for fractional representation in Q1.N

Parameters

[in] n - number of bits

void SIM::nco::set_output ( const vec & yout )

set initial output value y0

Parameters

[in] yout - [vec] = [cy|ph]

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

C:/jobs/vcc/itpp_sci/include/sim/sim_nco.hpp
C:/jobs/vcc/itpp_sci/sim_lib/code/sim_nco.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation