Component: Waveform Generator (DSP)

Author	Matrix Ltd
Version	1.2
Category	DSP

Waveform Generator component

A waveform generator component designed to plug into the DSP system component and allow several discreet waveforms to be generated. Functions available include: Sine, Cosine, Square, Pulse, Triangle, Sawtooth, Noise, Custom

Component Pack

DSP

Detailed description

No detailed description exists yet for this component

Examples

Basic Sine Wave Generator

FreqGen The frequency is controlled by adjusting the potentiometer on the panel.

The frequency generator period is controlled using the Period Offset property and/or the SetOffset component macro. The Offset value is the LUT index multiplier so a offset of 3.0 will only read every 3 values of the waveform to provide 1/3 of the period and generate 3 x the frequency. As the waveform period is being reduced there is potential for the signal to start to become less defined and more stepped.

Multi Wave Signal Generator

Switch-able mode frequency generator example file generating different waveforms depending on the value on pins RB0 and RB1.

0 = Sine, 1 = Square, 2 = Triangle, 3 = SawTooth

FreqGenMulti

The frequency is controlled by adjusting the potentiometer on the panel, the waveform is controlled by adjusting the switches on the panel.

Downloadable macro reference

	Generate
Assigns a single value to the specified buffer from the selected waveform data. Each call will read the next value from the waveform and will wrap correctly at the end of the data period.
- VOID	Return

	ModifyPhaseOffset
Shifts the output phase by the specified absolute angle in degrees.
- FLOAT	PhaseOffset
Phase offset in degrees
- BOOL	Absolute
0=Relative offset to current o/p 1=Absolute offset to initial o/p
- VOID	Return

	GenerateArray
Fills the output buffer with the selected waveform data. If the buffer is smaller or larger then the waveform data period then the data passed will follow on correctly for subsequent cycles.
- VOID	Return

	ModifyFrequency
Sets the frequency output rate by altering the period offset to a new value.
- FLOAT	OffsetRate
0.2=F/5 0.5=F/2 1.0=F 1.5=F*1.5 2.0=F*2
- VOID	Return

	SetOffset
- UINT	Offset
- VOID	Return

	GetOffset
- UINT	Return

Property reference

	Properties
	Buffer Size
Number of individual elements the buffer can store, default 1.
	Buffer Type
Sets the buffer data type.
	Waveform
	Type
Waveform type selection
	Amplitude
Waveform amplitude or volume
	Offset
Waveform DC offset
	Calculate Data
Yes = Allows Sine and Cosine data to be generated using a mathmatical floating point calculation, provides much better resolution at the cost of processing performance. No = Allows Sine and Cosine data to be generated ahead of run time, provides fixed resolution output but is fast and efficient to generate.
	Samples
Waveform sample count, the number of data points in the stored cyclic wave look up table.
	Start Phase Angle
Waveform phase, the angle in degrees or sample in the wave to start streaming from
	Data
The raw waveform data
	Period Offset
The initial amount that the index increments through the LUT data when reading the stored waveform. 0.2 = Frequency / 5 0.5 = Frequency / 2 1.0 = Original Frequency 1.5 = Frequency * 1.5 2.0 = Frequency * 2
	Sample Period
Degrees per default sample offset period
	Frequency Calculation
	Sample Rate (hz)
Allows the sample rate to be entered to allow some basic calculations
	Period (s)
The length of time in seconds that the wave period will cover at the specified sample rate
	Frequency (hz)
The repeat frequency of the wave at the specified sample rate