scripts/README.md

@@ -51,13 +51,3 @@ low pass & decimate if necessary
             reset code detection counter (prohibit detecting codes for another 0.5 sec)
 
 ```
-
-## Usage
-Either
-```
-./audio-capture.sh | ./live.py
-```
-or
-```
-./audio-pipe.sh ./samples/MA-ZC.wav | ./live.py
-```

scripts/audio-capture.sh

@@ -3,6 +3,6 @@
 set -eux
 
 sample_rate="44100"
-channels="1"
+channels="2"
 
-arecord -t raw -c ${channels} -f S16_LE -r ${sample_rate}
+arecord -t raw -c ${channels} -f S16_LE -r ${sample_rate}

scripts/audio-pipe.sh

@@ -4,6 +4,6 @@ set -eux
 
 audio_file=$1
 sample_rate="44100"
-channels="1"
+channels="2"
 
-ffmpeg -hide_banner -loglevel error -i ${audio_file} -f s16le -ac ${channels} -ar ${sample_rate} -
+ffmpeg -i ${audio_file} -f s16le -ac ${channels} -ar ${sample_rate} -

scripts/live.py

@@ -3,14 +3,19 @@
 import sys
 import threading
 import numpy as np
-import signal as sig
-from tones import TONES
-from filters import anti_alias, bandpass_filter, note
-from scipy import signal
-from scipy.signal import butter, lfilter, decimate
-
+import signal
 import pyqtgraph as pg
-from pyqtgraph.Qt import QtGui, QtWidgets, mkQApp
+
+data1 = np.random.normal(size=300)
+ptr1 = 0
+
+win = pg.GraphicsLayoutWidget(show=True)
+win.setWindowTitle('pyqtgraph example: Scrolling Plots')
+
+plot = win.addPlot()
+curve = plot.plot(data1)
+
+
 
 keep_running = True
 def signal_handler(sig, frame):
@@ -18,62 +23,6 @@ def signal_handler(sig, frame):
     print('SIGINT received. Stopping...')
     keep_running = False
 
-
-class DetectorGui(QtWidgets.QMainWindow):
-    def __init__(self, *args, **kwargs):
-        super(DetectorGui, self).__init__(*args, **kwargs)
-        layout = pg.GraphicsLayoutWidget(show=True)
-        self.setCentralWidget(layout)
-        self.setWindowTitle('SELCAL Detector')
-        self.resize(1280, 800)
-
-        self.plot = layout.addPlot()
-        legend_view = layout.addViewBox()
-
-        legend = pg.LegendItem(offset=(0, 0))
-        legend.setParentItem(legend_view)
-
-        color_map = pg.colormap.get('CET-C6s')
-        colors = color_map.getLookupTable(nPts=len(TONES))
-
-        t = np.linspace(0, 500, 100)
-
-        self.tone_data = {}
-        self.tone_lines = {}
-
-        for tone,color in zip(TONES.keys(), colors):
-            self.tone_data[tone] = np.zeros(int(10000), dtype=np.float64) #np.array([], dtype=np.float64)
-            self.tone_lines[tone] = self.plot.plot(self.tone_data[tone], pen=pg.mkPen(color=color), name=tone)
-            legend.addItem(self.tone_lines[tone], tone)
-
-        self.plot.setLabel('left', 'Signal Correlation')
-        self.plot.setLabel('bottom', 'Time (samples)')
-        self.plot.showGrid(x=True, y=True)
-
-        legend_view.setFixedWidth(80)
-        layout.ci.layout.setColumnFixedWidth(1, 80)
-
-        self.show()
-
-    def set_position(self, pos):
-        pass
-
-    def push_tone(self, tone, value):
-        self.tone_data[tone] = np.roll(self.tone_data[tone], -1)
-        self.tone_data[tone][-1] = value
-        self.tone_lines[tone].setData(self.tone_data[tone])
-
-    def push_tones(self, tone, values):
-        #self.tone_data[tone] = np.append(self.tone_data[tone], values)
-
-        self.tone_data[tone] = np.roll(self.tone_data[tone], -len(values))
-        self.tone_data[tone][-len(values):] = values
-        self.tone_lines[tone].setData(self.tone_data[tone])
-
-
-mkQApp("Correlation matrix display")
-gui = DetectorGui()
-
 def read_audio_from_stdin(chunk_size, process_chunk):
     global keep_running
 
@@ -90,43 +39,55 @@ def read_audio_from_stdin(chunk_size, process_chunk):
         audio_chunk = np.frombuffer(data, dtype=np.int16)
         process_chunk(audio_chunk)
 
-sample_rate = 44100
-note_length = 0.1
-N = 256
-cumsum_convolution = np.ones(N)/N
-
-
 def process_audio_chunk(audio_chunk):
-    global gui
+    # Example processing: simply print the chunk
+    global data1, ptr1, curve
+    print(f"Read chunk: {len(audio_chunk)}")
 
-    data = audio_chunk
-    sample_rate = 44100
+    data1[:-1] = data1[1:]  # shift data in the array one sample left
+                           # (see also: np.roll)
+    data1[-1] = len(audio_chunk)
 
-    data, sample_rate, decimation = anti_alias(data, sample_rate, 4800)
-    pure_signals = {tone:note(freq, note_length, rate=sample_rate) for tone,freq in TONES.items()}
-    correlations = {tone:np.abs(signal.correlate(data, pure, mode='same')) for tone,pure in pure_signals.items()}
-    massaged = {tone:decimate(np.convolve(correlation, cumsum_convolution, mode='valid'), 4) for tone,correlation in correlations.items()}
-
-    print('processing done')
-
-    for tone,massage in massaged.items():
-        gui.push_tones(tone, massage )
+    ptr1 += 1
+    curve.setData(data1)
+    curve.setPos(ptr1, 0)
 
 
 if __name__ == '__main__':
-    sig.signal(sig.SIGINT, signal_handler)
+    signal.signal(signal.SIGINT, signal_handler)
 
     chunk_duration = 0.1 # seconds
     sample_rate = 44100
-    channels = 1
+    channels = 2
     chunk_size = int(sample_rate * chunk_duration) * channels
 
     reader_thread = threading.Thread(target=read_audio_from_stdin, args=(chunk_size, process_audio_chunk))
     reader_thread.daemon = True
     reader_thread.start()
 
-
     pg.exec()
 
     # Wait...
     reader_thread.join()
+
+
+'''
+# 1) Simplest approach -- update data in the array such that plot appears to scroll
+#    In these examples, the array size is fixed.
+p1 = win.addPlot()
+p2 = win.addPlot()
+data1 = np.random.normal(size=300)
+curve1 = p1.plot(data1)
+curve2 = p2.plot(data1)
+ptr1 = 0
+def update1():
+    global data1, ptr1
+    data1[:-1] = data1[1:]  # shift data in the array one sample left
+                            # (see also: np.roll)
+    data1[-1] = np.random.normal()
+    curve1.setData(data1)
+
+    ptr1 += 1
+    curve2.setData(data1)
+    curve2.setPos(ptr1, 0)
+'''