GNU Radio Manual and C++ API Reference 3.10.5.1
The Free & Open Software Radio Ecosystem
Miscellaneous <br>

Classes

class  gr::fxpt
 fixed point sine and cosine and friends. More...
 
class  gr::fxpt_nco
 Numerically Controlled Oscillator (NCO) More...
 
class  gr::fxpt_vco
 Voltage Controlled Oscillator (VCO) More...
 
class  gr::message
 Message class. More...
 
class  gr::msg_queue
 thread-safe message queue More...
 
class  gr::nco< o_type, i_type >
 base class template for Numerically Controlled Oscillator (NCO) More...
 
class  gr::prefs
 Base class for representing user preferences a la windows INI files. More...
 
class  gr::blocks::lfsr_15_1_0
 Linear Feedback Shift Register using primitive polynomial x^15 + x + 1. More...
 
class  gr::blocks::lfsr_32k
 generate pseudo-random sequence of length 32768 bits. More...
 
class  gr::digital::lfsr
 Fibonacci Linear Feedback Shift Register using specified polynomial mask. More...
 
struct  gr::fft::fft_inbuf< T, forward >
 FFT: templated. More...
 
class  gr::fft::goertzel
 Implements Goertzel single-bin DFT calculation. More...
 
class  gr::wavelet::squash_ff
 Implements cheap resampling of spectrum directly from spectral points, using gsl interpolation. More...
 

Functions

GR_RUNTIME_API float gr::fast_atan2f (float y, float x)
 Fast arc tangent using table lookup and linear interpolation. More...
 
GR_RUNTIME_API rt_status_t gr::enable_realtime_scheduling ()
 If possible, enable high-priority "real time" scheduling. More...
 

Detailed Description

Function Documentation

◆ enable_realtime_scheduling()

GR_RUNTIME_API rt_status_t gr::enable_realtime_scheduling ( )

If possible, enable high-priority "real time" scheduling.

◆ fast_atan2f()

GR_RUNTIME_API float gr::fast_atan2f ( float  y,
float  x 
)

Fast arc tangent using table lookup and linear interpolation.

Parameters
ycomponent of input vector
xcomponent of input vector
Returns
float angle angle of vector (x, y) in radians

This function calculates the angle of the vector (x,y) based on a table lookup and linear interpolation. The table uses a 256 point table covering -45 to +45 degrees and uses symmetry to determine the final angle value in the range of -180 to 180 degrees. Note that this function uses the small angle approximation for values close to zero. This routine calculates the arc tangent with an average error of +/- 0.045 degrees.

Referenced by gr::fast_atan2f().