JavaScript Block - Amplifier Model

options:
    parameters:
        author: Claude
        comment: ''
        copyright: ''
        description: Arbitrary DSP in JavaScript -- a power-amplifier model written as a JS Block, its distortion driven live by sliders, followed by the repository's Complex Soft Clipper
        generate_options: qt_gui
        id: JavaScript_Block___Amplifier_Model
        title: JavaScript Block - Amplifier Model
    states:
        coordinate: [10, 10]
        rotation: 0
        state: enabled
blocks:
-   name: am_pm
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: AM/PM conversion
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '0'
        step: '0.05'
        stop: '2'
        value: '0'
        widget: counter_slider
    states:
        coordinate: [580, 10]
        rotation: 0
        state: enabled
-   name: clip_threshold
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: Clipper threshold
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '0.1'
        step: '0.05'
        stop: '2'
        value: '2'
        widget: counter_slider
    states:
        coordinate: [840, 10]
        rotation: 0
        state: enabled
-   name: drive
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: Amplifier drive
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '0.1'
        step: '0.1'
        stop: '8'
        value: '1'
        widget: counter_slider
    states:
        coordinate: [1090, 10]
        rotation: 0
        state: enabled
-   name: samp_rate
    id: variable
    parameters:
        comment: ''
        value: '200000'
    states:
        coordinate: [1340, 10]
        rotation: 0
        state: enabled
-   name: amplifier
    id: wasm_js_block
    parameters:
        _js_io: '{"decim":1,"doc":"AM/AM compression and AM/PM conversion, the way a real PA distorts.","general":false,"hasStart":false,"hasStop":false,"history":1,"inputs":[{"dtype":"complex","vlen":1}],"interp":1,"label":"Amplifier Model","numericParams":["drive","am_pm"],"outputMultiple":0,"outputs":[{"dtype":"complex","vlen":1}],"overridesForecast":false,"params":[["drive",1],["am_pm",0]],"relativeRate":1}'
        _js_source: ''
        _source_code: "// An amplifier, modelled in JavaScript.\n//\n// A real power amplifier does two things to a complex signal as it is driven\n// harder: it compresses the magnitude (AM/AM) and it shifts the phase in\n// proportion to the input power (AM/PM). Neither is a stock GNU Radio block, and\n// the two together are what turn a clean tone into the spectral regrowth you can\n// see on the Frequency Sink downstream.\n//\n// Both parameters are driven live by the sliders in this flowgraph: every numeric\n// parameter of a JS block gets a setter, so a QT GUI Range drives one exactly as\n// it drives a C++ block's.\n//\n// Double-click this block to open the code editor. The block's ports, parameters\n// and label all follow whatever you write, as you write it.\ngr.export({\n  label: 'Amplifier Model',\n  doc: 'AM/AM compression and AM/PM conversion, the way a real PA distorts.',\n  inputs: ['complex'],\n  outputs: ['complex'],\n  params: { drive: 1.0, am_pm: 0.0 },\n\n  work(nout, input, output) {\n    const x = input[0], y = output[0];\n    const drive = this.drive, amPm = this.am_pm;\n    for (let i = 0; i < nout * 2; i += 2) {\n      const re = x[i] * drive, im = x[i + 1] * drive;\n      const power = re * re + im * im;\n      // Rapp-style soft compression: unity gain at low drive, rolling off to a\n      // magnitude of 1 as the input is pushed past it.\n      const gain = 1 / Math.sqrt(1 + power * power);\n      // AM/PM: the phase shift grows with the instantaneous power, which is what\n      // makes the distortion asymmetric about the carrier.\n      const shift = amPm * power;\n      const c = Math.cos(shift), s = Math.sin(shift);\n      y[i] = gain * (re * c - im * s);\n      y[i + 1] = gain * (re * s + im * c);\n    }\n    return nout;\n  },\n});\n"
        affinity: ''
        alias: ''
        am_pm: am_pm
        comment: ''
        drive: drive
    states:
        coordinate: [880, 260]
        rotation: 0
        state: enabled
-   name: clipper
    id: js_clip_cc
    parameters:
        affinity: ''
        alias: ''
        comment: ''
        knee: '0.5'
        maxoutbuf: '0'
        minoutbuf: '0'
        threshold: clip_threshold
    states:
        coordinate: [1160, 270]
        rotation: 0
        state: enabled
-   name: constellation
    id: qtgui_const_sink_x
    parameters:
        affinity: ''
        alias: ''
        alpha1: '1'
        alpha10: '1'
        alpha2: '1'
        alpha3: '1'
        alpha4: '1'
        alpha5: '1'
        alpha6: '1'
        alpha7: '1'
        alpha8: '1'
        alpha9: '1'
        autoscale: 'False'
        axislabels: 'True'
        color1: '"blue"'
        color10: '"dark blue"'
        color2: '"red"'
        color3: '"green"'
        color4: '"black"'
        color5: '"cyan"'
        color6: '"magenta"'
        color7: '"yellow"'
        color8: '"dark red"'
        color9: '"dark green"'
        comment: ''
        grid: 'True'
        label1: Amplifier output
        label10: ''
        label2: ''
        label3: ''
        label4: ''
        label5: ''
        label6: ''
        label7: ''
        label8: ''
        label9: ''
        legend: 'True'
        marker1: '0'
        marker10: '0'
        marker2: '0'
        marker3: '0'
        marker4: '0'
        marker5: '0'
        marker6: '0'
        marker7: '0'
        marker8: '0'
        marker9: '0'
        name: AM/AM and AM/PM
        nconnections: '1'
        size: '1024'
        style1: '0'
        style10: '0'
        style2: '0'
        style3: '0'
        style4: '0'
        style5: '0'
        style6: '0'
        style7: '0'
        style8: '0'
        style9: '0'
        tr_chan: '0'
        tr_level: '0'
        tr_mode: qtgui.TRIG_MODE_FREE
        tr_slope: qtgui.TRIG_SLOPE_POS
        tr_tag: ''
        update_time: '0.1'
        width1: '1'
        width10: '1'
        width2: '1'
        width3: '1'
        width4: '1'
        width5: '1'
        width6: '1'
        width7: '1'
        width8: '1'
        width9: '1'
        xmax: '2'
        xmin: '-2'
        ymax: '2'
        ymin: '-2'
    states:
        coordinate: [80, 540]
        rotation: 0
        state: enabled
-   name: spectrum
    id: qtgui_freq_sink_x
    parameters:
        affinity: ''
        alias: ''
        alpha1: '1'
        alpha10: '1'
        alpha2: '1'
        alpha3: '1'
        alpha4: '1'
        alpha5: '1'
        alpha6: '1'
        alpha7: '1'
        alpha8: '1'
        alpha9: '1'
        autoscale: 'False'
        average: '0.2'
        axislabels: 'True'
        color1: '"blue"'
        color10: '"dark blue"'
        color2: '"red"'
        color3: '"green"'
        color4: '"black"'
        color5: '"cyan"'
        color6: '"magenta"'
        color7: '"yellow"'
        color8: '"dark red"'
        color9: '"dark green"'
        comment: ''
        ctrlpanel: 'False'
        fc: '0'
        fftsize: '2048'
        freqhalf: 'True'
        grid: 'True'
        label1: Amplifier output
        label10: ''
        label2: ''
        label3: ''
        label4: ''
        label5: ''
        label6: ''
        label7: ''
        label8: ''
        label9: ''
        legend: 'True'
        marker1: '-1'
        marker10: '-1'
        marker2: '-1'
        marker3: '-1'
        marker4: '-1'
        marker5: '-1'
        marker6: '-1'
        marker7: '-1'
        marker8: '-1'
        marker9: '-1'
        maxoutbuf: '0'
        minoutbuf: '0'
        name: Spectral regrowth
        nconnections: '1'
        samp_rate: samp_rate
        style1: '1'
        style10: '1'
        style2: '1'
        style3: '1'
        style4: '1'
        style5: '1'
        style6: '1'
        style7: '1'
        style8: '1'
        style9: '1'
        tr_chan: '0'
        tr_level: '0'
        tr_mode: qtgui.TRIG_MODE_FREE
        tr_tag: ''
        type: complex
        update_time: '0.1'
        width1: '1'
        width10: '1'
        width2: '1'
        width3: '1'
        width4: '1'
        width5: '1'
        width6: '1'
        width7: '1'
        width8: '1'
        width9: '1'
        ymax: '10'
        ymin: '-90'
    states:
        coordinate: [80, 680]
        rotation: 0
        state: enabled
-   name: throttle
    id: blocks_throttle2
    parameters:
        affinity: ''
        alias: ''
        comment: ''
        ignoretag: 'True'
        limit: time
        maximum: '0.1'
        maxoutbuf: '0'
        minoutbuf: '0'
        samples_per_second: samp_rate
        type: complex
        vlen: '1'
    states:
        coordinate: [550, 250]
        rotation: 0
        state: enabled
-   name: tone_a
    id: analog_sig_source_x
    parameters:
        affinity: ''
        alias: ''
        amplitude: '0.5'
        comment: ''
        frequency: '9000'
        maxoutbuf: '0'
        minoutbuf: '0'
        samp_rate: samp_rate
        type: complex
        waveform: analog.GR_COS_WAVE
    states:
        coordinate: [10, 240]
        rotation: 0
        state: enabled
-   name: tone_b
    id: analog_sig_source_x
    parameters:
        affinity: ''
        alias: ''
        amplitude: '0.5'
        comment: ''
        frequency: '11000'
        maxoutbuf: '0'
        minoutbuf: '0'
        samp_rate: samp_rate
        type: complex
        waveform: analog.GR_COS_WAVE
    states:
        coordinate: [10, 380]
        rotation: 0
        state: enabled
-   name: two_tone
    id: blocks_add_xx
    parameters:
        affinity: ''
        alias: ''
        comment: ''
        maxoutbuf: '0'
        minoutbuf: '0'
        num_inputs: '2'
        type: complex
        vlen: '1'
    states:
        coordinate: [310, 260]
        rotation: 0
        state: enabled
-   name: wasm_gui_layout_0
    id: wasm_gui_layout
    parameters:
        affinity: ''
        alias: ''
        columns: '12'
        comment: ''
        layout: '{}'
        row_height: '60'
    states:
        coordinate: [290, 10]
        rotation: 0
        state: enabled
connections:
- [amplifier, '0', clipper, '0']
- [clipper, '0', constellation, '0']
- [clipper, '0', spectrum, '0']
- [throttle, '0', amplifier, '0']
- [tone_a, '0', two_tone, '0']
- [tone_b, '0', two_tone, '1']
- [two_tone, '0', throttle, '0']
metadata:
    file_format: 1
    grc_version: 3.11.0.0