Oscillators

class tiliqua.dsp.SawNCO(*args, src_loc_at=0, **kwargs)

Sawtooth Numerically Controlled Oscillator.

Frequency is linearly proportional to i.payload.freq_inc, with optional phase modulation on i.payload.phase. One output sample per input sample.

Often a saw is used routed into a waveshaper for arbitrary waveform types.

Members:

i (In(stream.Signature(data.StructLayout)) – Input stream - freq_inc (linear frequency) and phase (phase offset). One output sample is produced for each input sample.
o (Out(stream.Signature(ASQ))) – Output stream, values sweep from ASQ.min() to ASQ.max().

class tiliqua.dsp.WhiteNoise(*args, src_loc_at=0, **kwargs)

Simple white noise generator based on an LFSR.

Members:: o (Out(stream.Signature(ASQ))) – Output stream of white noise. Throttled by output backpressure on o.ready.

class tiliqua.dsp.DWO(*args, src_loc_at=0, **kwargs)

Digital Waveguide Oscillator.

Emits a fixed frequency and amplitude sine wave, without needing a sine LUT. Instead, only uses 2 registers, 1 multiply, 3 adds.

This is not easy to modulate, but it is an interesting way to achieve a high-fidelity sine wave with minimal resources.

For details, see Fig. 3 from:: https://ccrma.stanford.edu/~jos/wgo/Second_Order_Waveguide_Filter.html

Members:: o (Out(stream.Signature(ASQ))) – Output stream of sinusoid samples. Throttled by output backpressure on o.ready.

__init__(sq=None, macp=None, c=0.99)