waterfallsink.py

这是用python语言写的一个数字广播的信号处理工具包。利用它

            pens.append( wx.Pen(colour, 2, wx.SOLID))
        return pens
        
    def OnPaint(self, event):
        dc = wx.PaintDC(self)
        self.DoDrawing(dc)

    def DoDrawing(self, dc=None):
        if dc is None:
            dc = wx.ClientDC(self)
        dc.DrawBitmap(self.bm, 0, 0, False )
    

    def const_list(self,const,len):
        a = [const]
        for i in range(1,len):
            a.append(const)
        return a

    def make_colormap(self):
        r = []
        r.extend(self.const_list(0,96))
        r.extend(range(0,255,4))
        r.extend(self.const_list(255,64))
        r.extend(range(255,128,-4))
        
        g = []
        g.extend(self.const_list(0,32))
        g.extend(range(0,255,4))
        g.extend(self.const_list(255,64))
        g.extend(range(255,0,-4))
        g.extend(self.const_list(0,32))
        
        b = range(128,255,4)
        b.extend(self.const_list(255,64))
        b.extend(range(255,0,-4))
        b.extend(self.const_list(0,96))
        return (r,g,b)

    def set_data (self, evt):
        dB = evt.data
        L = len (dB)

        dc1 = wx.MemoryDC()
        dc1.SelectObject(self.bm)
        dc1.Blit(0,1,self.fftsink.fft_size,300,dc1,0,0,wx.COPY,False,-1,-1)

        x = max(abs(self.fftsink.sample_rate), abs(self.fftsink.baseband_freq))
        if x >= 1e9:
            sf = 1e-9
            units = "GHz"
        elif x >= 1e6:
            sf = 1e-6
            units = "MHz"
        else:
            sf = 1e-3
            units = "kHz"


        if self.fftsink.input_is_real:     # only plot 1/2 the points
            d_max = L/2
            p_width = 2
        else:
            d_max = L/2
            p_width = 1

        scale_factor = self.scale_factor
        if self.fftsink.input_is_real:     # real fft
           for x_pos in range(0, d_max):
               value = int(dB[x_pos] * scale_factor)
               value = min(255, max(0, value))
               dc1.SetPen(self.pens[value])
               dc1.DrawRectangle(x_pos*p_width, 0, p_width, 1) 
        else:                               # complex fft
           for x_pos in range(0, d_max):    # positive freqs
               value = int(dB[x_pos] * scale_factor)
               value = min(255, max(0, value))
               dc1.SetPen(self.pens[value])
               dc1.DrawRectangle(x_pos*p_width + d_max, 0, p_width, 1) 
           for x_pos in range(0 , d_max):   # negative freqs
               value = int(dB[x_pos+d_max] * scale_factor)
               value = min(255, max(0, value))
               dc1.SetPen(self.pens[value])
               dc1.DrawRectangle(x_pos*p_width, 0, p_width, 1) 

        self.DoDrawing (None)

    def on_average(self, evt):
        # print "on_average"
        self.fftsink.set_average(evt.IsChecked())

    def on_right_click(self, event):
        menu = self.popup_menu
        for id, pred in self.checkmarks.items():
            item = menu.FindItemById(id)
            item.Check(pred())
        self.PopupMenu(menu, event.GetPosition())


    def build_popup_menu(self):
        self.id_incr_ref_level = wx.NewId()
        self.id_decr_ref_level = wx.NewId()
        self.id_incr_y_per_div = wx.NewId()
        self.id_decr_y_per_div = wx.NewId()
        self.id_y_per_div_1 = wx.NewId()
        self.id_y_per_div_2 = wx.NewId()
        self.id_y_per_div_5 = wx.NewId()
        self.id_y_per_div_10 = wx.NewId()
        self.id_y_per_div_20 = wx.NewId()
        self.id_average = wx.NewId()

        self.Bind(wx.EVT_MENU, self.on_average, id=self.id_average)
        #self.Bind(wx.EVT_MENU, self.on_incr_ref_level, id=self.id_incr_ref_level)
        #self.Bind(wx.EVT_MENU, self.on_decr_ref_level, id=self.id_decr_ref_level)
        #self.Bind(wx.EVT_MENU, self.on_incr_y_per_div, id=self.id_incr_y_per_div)
        #self.Bind(wx.EVT_MENU, self.on_decr_y_per_div, id=self.id_decr_y_per_div)
        #self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_1)
        #self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_2)
        #self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_5)
        #self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_10)
        #self.Bind(wx.EVT_MENU, self.on_y_per_div, id=self.id_y_per_div_20)


        # make a menu
        menu = wx.Menu()
        self.popup_menu = menu
        menu.AppendCheckItem(self.id_average, "Average")
        # menu.Append(self.id_incr_ref_level, "Incr Ref Level")
        # menu.Append(self.id_decr_ref_level, "Decr Ref Level")
        # menu.Append(self.id_incr_y_per_div, "Incr dB/div")
        # menu.Append(self.id_decr_y_per_div, "Decr dB/div")
        # menu.AppendSeparator()
        # we'd use RadioItems for these, but they're not supported on Mac
        #menu.AppendCheckItem(self.id_y_per_div_1, "1 dB/div")
        #menu.AppendCheckItem(self.id_y_per_div_2, "2 dB/div")
        #menu.AppendCheckItem(self.id_y_per_div_5, "5 dB/div")
        #menu.AppendCheckItem(self.id_y_per_div_10, "10 dB/div")
        #menu.AppendCheckItem(self.id_y_per_div_20, "20 dB/div")

        self.checkmarks = {
            self.id_average : lambda : self.fftsink.average
            #self.id_y_per_div_1 : lambda : self.fftsink.y_per_div == 1,
            #self.id_y_per_div_2 : lambda : self.fftsink.y_per_div == 2,
            #self.id_y_per_div_5 : lambda : self.fftsink.y_per_div == 5,
            #self.id_y_per_div_10 : lambda : self.fftsink.y_per_div == 10,
            #self.id_y_per_div_20 : lambda : self.fftsink.y_per_div == 20,
            }


def next_up(v, seq):
    """
    Return the first item in seq that is > v.
    """
    for s in seq:
        if s > v:
            return s
    return v

def next_down(v, seq):
    """
    Return the last item in seq that is < v.
    """
    rseq = list(seq[:])
    rseq.reverse()

    for s in rseq:
        if s < v:
            return s
    return v


# ----------------------------------------------------------------
#          	      Deprecated interfaces
# ----------------------------------------------------------------

# returns (block, win).
#   block requires a single input stream of float
#   win is a subclass of wxWindow

def make_waterfall_sink_f(fg, parent, title, fft_size, input_rate):
    
    block = waterfall_sink_f(fg, parent, title=title, fft_size=fft_size,
                             sample_rate=input_rate)
    return (block, block.win)

# returns (block, win).
#   block requires a single input stream of gr_complex
#   win is a subclass of wxWindow

def make_waterfall_sink_c(fg, parent, title, fft_size, input_rate):
    block = waterfall_sink_c(fg, parent, title=title, fft_size=fft_size,
                             sample_rate=input_rate)
    return (block, block.win)


# ----------------------------------------------------------------
# Standalone test app
# ----------------------------------------------------------------

class test_app_flow_graph (stdgui.gui_flow_graph):
    def __init__(self, frame, panel, vbox, argv):
        stdgui.gui_flow_graph.__init__ (self, frame, panel, vbox, argv)

        fft_size = 512

        # build our flow graph
        input_rate = 20.000e3

        # Generate a complex sinusoid
        src1 = gr.sig_source_c (input_rate, gr.GR_SIN_WAVE, 5.75e3, 1000)
        #src1 = gr.sig_source_c (input_rate, gr.GR_CONST_WAVE, 5.75e3, 1000)

        # We add these throttle blocks so that this demo doesn't
        # suck down all the CPU available.  Normally you wouldn't use these.
        thr1 = gr.throttle(gr.sizeof_gr_complex, input_rate)

        sink1 = waterfall_sink_c (self, panel, title="Complex Data", fft_size=fft_size,
                                  sample_rate=input_rate, baseband_freq=100e3)
        vbox.Add (sink1.win, 1, wx.EXPAND)
        self.connect (src1, thr1, sink1)

        # generate a real sinusoid
        src2 = gr.sig_source_f (input_rate, gr.GR_SIN_WAVE, 5.75e3, 1000)
        #src2 = gr.sig_source_f (input_rate, gr.GR_CONST_WAVE, 5.75e3, 1000)
        thr2 = gr.throttle(gr.sizeof_float, input_rate)
        sink2 = waterfall_sink_f (self, panel, title="Real Data", fft_size=fft_size,
                                  sample_rate=input_rate, baseband_freq=100e3)
        vbox.Add (sink2.win, 1, wx.EXPAND)
        self.connect (src2, thr2, sink2)

def main ():
    app = stdgui.stdapp (test_app_flow_graph,
                         "Waterfall Sink Test App")
    app.MainLoop ()

if __name__ == '__main__':
    main ()