Signal Processing ----------------- .. jupyter-execute:: :hide-code: %config InlineBackend.figure_format = 'svg' import schemdraw from schemdraw import elements as elm from schemdraw import dsp Signal processing elements are in the :py:mod:`schemdraw.dsp.dsp` module. .. code-block:: python from schemdraw import dsp Various Networks ^^^^^^^^^^^^^^^^ .. jupyter-execute:: :code-below: d = schemdraw.Drawing() d += dsp.Line().length(d.unit/3).label('in') d += (inpt := dsp.Dot()) d += dsp.Arrow().length(d.unit/3) d += (delay := dsp.Box(w=2, h=2).anchor('W').label('Delay\nT')) d += dsp.Arrow().right().length(d.unit/2).at(delay.E) d += (sm := dsp.SumSigma()) d += dsp.Arrow().at(sm.E).length(d.unit/2) d += (intg := dsp.Box(w=2, h=2).anchor('W').label('$\int$')) d += dsp.Arrow().right().at(intg.E).length(d.unit/2).label('out', loc='right') d += dsp.Line().down().at(inpt.center).length(d.unit/2) d += dsp.Line().right().tox(sm.S) d += dsp.Arrow().up().toy(sm.S).label('+', loc='bot') d.draw() .. jupyter-execute:: :code-below: d = schemdraw.Drawing(fontsize=14) d += dsp.Line().length(d.unit/2).label('F(s)') d.push() d += dsp.Dot() d += dsp.Line().up().length(d.unit/2) d += dsp.Arrow().right().length(d.unit/2) d += (h1 := dsp.Box(w=2, h=2).anchor('W').label('$H_1(s)$')) d.pop() d += dsp.Line().down().length(d.unit/2) d += dsp.Arrow().right().length(d.unit/2) d += (h2 := dsp.Box(w=2, h=2).anchor('W').label('$H_2(s)$')) d += (sm := dsp.SumSigma().right().at((h1.E[0] + d.unit/2, 0)).anchor('center')) d += dsp.Line().right().at(h1.E).tox(sm.N) d += dsp.Arrow().down().toy(sm.N) d += dsp.Line().right().at(h2.E).tox(sm.S) d += dsp.Arrow().up().toy(sm.S) d += dsp.Arrow().right().at(sm.E).length(d.unit/3).label('Y(s)', 'right') d.draw() Superheterodyne Receiver ^^^^^^^^^^^^^^^^^^^^^^^^ `Source `_. .. jupyter-execute:: :code-below: d = schemdraw.Drawing(fontsize=12) d += dsp.Antenna() d += dsp.Line().right().length(d.unit/4) d += (filt1 := dsp.Filter(response='bp').fill('thistle').anchor('W').label('RF filter\n#1', 'bottom', ofst=.2)) d += dsp.Line().at(filt1.E).length(d.unit/4) d += dsp.Amp().fill('lightblue').label('LNA') d += dsp.Line().length(d.unit/4) d += (filt2 := dsp.Filter(response='bp').anchor('W').fill('thistle').label('RF filter\n#2', 'bottom', ofst=.2)) d += dsp.Line().right().at(filt2.E).length(d.unit/3) d += (mix := dsp.Mixer().fill('navajowhite').label('Mixer')) d += dsp.Line().down().at(mix.S).length(d.unit/3) d += dsp.Oscillator().right().anchor('N').fill('navajowhite').label('Local\nOscillator', 'right', ofst=.2) d += dsp.Line().right().at(mix.E).length(d.unit/3) d += (filtIF := dsp.Filter(response='bp').anchor('W').fill('thistle').label('IF filter', 'bottom', ofst=.2)) d += dsp.Line().right().at(filtIF.E).length(d.unit/4) d += dsp.Amp().fill('lightblue').label('IF\namplifier') d += dsp.Line().length(d.unit/4) d += (demod := dsp.Demod().anchor('W').fill('navajowhite').label('Demodulator', 'bottom', ofst=.2)) d += dsp.Arrow().right().at(demod.E).length(d.unit/3) d.draw() Direct Conversion Receiver ^^^^^^^^^^^^^^^^^^^^^^^^^^ .. jupyter-execute:: :code-below: d = schemdraw.Drawing() d += dsp.Antenna() d += dsp.Arrow().right().length(d.unit/2).label('$f_{RF}$', 'bot') d += dsp.Amp().label('LNA') d += dsp.Line().right().length(d.unit/5) d += dsp.Dot() d.push() d += dsp.Line().length(d.unit/4) d += (mix1 := dsp.Mixer().label('Mixer', ofst=0)) d += dsp.Arrow().length(d.unit/2) d += (lpf1 := dsp.Filter(response='lp').label('LPF', 'bot', ofst=.2)) d += dsp.Line().length(d.unit/6) d += (adc1 := dsp.Adc().label('ADC')) d += dsp.Arrow().length(d.unit/3) d += (dsp1 := dsp.Ic(pins=[dsp.IcPin(side='L'), dsp.IcPin(side='L'), dsp.IcPin(side='R')], size=(2.75, 5), leadlen=0).anchor('inL2').label('DSP')) d += dsp.Arrow().at(dsp1.inR1).length(d.unit/3) d.pop() d += dsp.Line().down().toy(dsp1.inL1) d += dsp.Arrow().right().tox(mix1.W) d += (mix2 := dsp.Mixer().label('Mixer', ofst=0)) d += dsp.Arrow().tox(lpf1.W) d += dsp.Filter(response='lp').label('LPF', 'bot', ofst=.2) d += dsp.Line().tox(adc1.W) d += dsp.Adc().label('ADC') d += dsp.Arrow().to(dsp1.inL1) d += dsp.Arrow().down().reverse().at(mix1.S).length(d.unit/6) d += dsp.Line().left().length(d.unit*1.25) d += dsp.Line().down().length(d.unit*.75) d += (flo := dsp.Dot().label('$f_{LO}$', 'left')) d.push() d += dsp.Line().down().length(d.unit/5) d += dsp.Oscillator().right().anchor('N').label('LO', 'left', ofst=.15) d.pop() d += dsp.Arrow().down().reverse().at(mix2.S).length(d.unit/4) d += (b1 := dsp.Square().right().label('90°').anchor('N')) d += dsp.Arrow().left().reverse().at(b1.W).length(d.unit/4) d += dsp.Line().up().toy(flo.center) d += dsp.Line().left().tox(flo.center) d.draw() Digital Filter ^^^^^^^^^^^^^^ .. jupyter-execute:: :code-below: d = schemdraw.Drawing(unit=1, fontsize=14) d += dsp.LineDot().length(d.unit*2).label('x[n]', 'left') d.push() d += dsp.Line().right() d += dsp.Amp().label('$b_0$', 'bottom') d += dsp.Arrow() d += (s0 := dsp.Sum().anchor('W')) d.pop() d += dsp.Arrow().down() d += (z1 := dsp.Square(label='$z^{-1}$')) d += dsp.LineDot().length(d.unit/2) d.push() d += dsp.Line().right() d += dsp.Amp().label('$b_1$', 'bottom') d += dsp.Arrow() d += (s1 := dsp.Sum().anchor('W')) d.pop() d += dsp.Arrow().down().length(d.unit*.75) d += dsp.Square().label('$z^{-1}$') d += dsp.Line().length(d.unit*.75) d += dsp.Line().right() d += dsp.Amp().label('$b_2$', 'bottom') d += dsp.Arrow() d += (s2 := dsp.Sum().anchor('W')) d += dsp.Arrow().up().at(s2.N).toy(s1.S) d += dsp.Arrow().up().at(s1.N).toy(s0.S) d += dsp.LineDot().right().at(s0.E).length(d.unit*2.75) d.push() d += dsp.Arrow().right().label('y[n]', 'right') d.pop() d += dsp.Arrow().down() d += dsp.Square().label('$z^{-1}$') d += dsp.LineDot().length(d.unit/2) d.push() d += dsp.Line().left() d += (a1 := dsp.Amp().label('$-a_1$', 'bottom')) d += dsp.Arrow().at(a1.out).tox(s1.E) d.pop() d += dsp.Arrow().down().length(d.unit*.75) d += dsp.Square().label('$z^{-1}$') d += dsp.Line().length(d.unit*.75) d += dsp.Line().left() d += (a2 := dsp.Amp().label('$-a_2$', 'bottom')) d += dsp.Arrow().at(a2.out).tox(s2.E) d.draw()