This page is used to define different waveforms for the Waveforms page.
This page has no frequence, time or voltage specifications. The curve is scaled to the values specified on Waveforms page.

Curve generating functions

Use "Enable curves" to display any of the defined curves

Harmonic, enter a list of harmonics, they will be combined to a curve
Fixed curve, the same as harmonic, but the basic curve does not need to be a sinus
Steps, specify the curve in tabular form
Formula, use a expression, see "Calculator" page for description of formats
Save, save a curve for later use (Definition is not saved, only curve), the saved curve can be used together with other curves
Unity sinus, a sinus curve, when no other function is selected, this is automatic selected

Curve shaping functions (Transfer functions)

Use "Enable transfer functions" to use ONE of these functions at a time.
CAVEAT: the slider must be moved to the right for the transfer function to work

Functions, some predefined functions
Steps, a list of input/output values
Formula, use a expression, see "Calculator" page for description of formats
Sample, simulate different types of A/D D/A converters

Input values

Harmonic	The frequence multiplier, only integer values can be specified
Level	Amplitude of this harmonic, must be a negative dB value (or use "todB(fraction)", to specify a fraction)
Phase	Phase of this harmonic, value is in degrees and can be both positive and negative
Curve	The curve waveform to use for this harmonic, any other waveform than sinus will add more higher harmonics
Steps: Time	Time must be between 0 and 1, lowest values must be specified first
Steps: Output	The value must be between 0 and 1
Steps: Smooth	Apply a smoothing function to the generated curve, remember that first and last value are adjacent

Transfer functions

The specified "try" values can be used with a "Unity sinus" to show the effect of the transfer function. Using "Display sinus" makes it easy to compare with a clean sinus.
CAVEAT: the slider must be moved to the right for the transfer function to work

Dual slope, two different slopes are used, the change point between the slopes are specified (try Y=0.1, X=20)
Hard clipping, the output level is clipped (try effect=100, width=30)
Exponential e, the e function is applied to the curve
Exponential, with any base is applied to the curve (try base=10)
Logarithmic, a ln(x) function is applied to the curve (try ofs=0.1)

Transfer Sample

PCM, puls code modulation, this is the ordinary DA/AD converter (try bits=8 rate=10)
DSD, Direct Stream Digital, bits signal above/below values (try level=10 rate=30)
PWM, puls width modulation, the width of the puls, shows the actual value (try rate=50)

Display sinus

Displays a sinus curve on the graph, this curve is only for reference and not use in any calculations.

Hints

Clicking on the curve will measure values
Usual first harmonic is 1, but other values can be used. This makes it possible to work with fractions of a harmonic (if 2 and 3 is used, it would give same result as 1 and 1.5)
The values are always normalized to -1 to 1 range (0 to 1 for symmetric), the normalization is always used after user functions.

MiscEl: Waveforms user curve