uhd::math Namespace Reference

Namespaces
	fp_compare

Enumerations
enum class	interp_mode { NEAREST_NEIGHBOR , LINEAR }

Functions
UHD_INLINE bool	frequencies_are_equal (double lhs, double rhs)
double	dB_to_lin (const double dB_val)
double	lin_to_dB (const double val)
template<typename T >
constexpr int	sign (T x)
	Returns the sign of x. More...
double	wrap_frequency (const double requested_freq, const double rate)
	Return a wrapped frequency that is the equivalent frequency in the first Nyquist zone. More...

Detailed Description

Contains useful mathematical functions, classes, and constants, which should be used in UHD when portable / std options are not available.

Enumeration Type Documentation

interp_mode

enum uhd::math::interp_mode

strong

Enumerator
NEAREST_NEIGHBOR
LINEAR

Function Documentation

dB_to_lin()

double uhd::math::dB_to_lin ( const double  dB_val )

inline

frequencies_are_equal()

UHD_INLINE bool uhd::math::frequencies_are_equal	(	double	lhs,
		double	rhs
	)

lin_to_dB()

double uhd::math::lin_to_dB ( const double  val )

inline

sign()

template<typename T >

constexpr int uhd::math::sign ( T  x )

inlineconstexpr

Returns the sign of x.

Note: This is equivalent to the Boost.Math version, but without the dependency.

Returns +1 for positive arguments, -1 for negative arguments, and 0 if x is zero.

wrap_frequency()

double uhd::math::wrap_frequency ( const double  requested_freq, const double  rate  )

inline

Return a wrapped frequency that is the equivalent frequency in the first Nyquist zone.

Examples:

• Just above the sampling rate: wrap_frequency(250e6, 200e6) == 50e6
• Just outside the Nyquist zone: wrap_frequency(120e6, 200e6) == -80e6
• Also works for negative frequencies: wrap_frequency(-250e6, 200e6) == -50e6