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    <p>Just a mix of answer and op code ( <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-audiocheblimit.html" rel="nofollow">sample pipe</a> )</p> <pre><code>#!/usr/bin/env python import pygtk pygtk.require('2.0') import gtk, gst, time class HelloWorld: def delete_event(self, widget, event, data=None): print "delete event occurred" return False def destroy(self, widget, data=None): print "destroy signal occurred" gtk.main_quit() def __init__(self): self.window = gtk.Window(gtk.WINDOW_TOPLEVEL) self.window.connect("delete_event", self.delete_event) self.window.connect("destroy", self.destroy) self.window.set_border_width(2) #self.window.set_size_request(600, 483) """ Play """ self.vbox = gtk.VBox(False, 2) self.vbox.set_border_width(0) self.hbox = gtk.HBox() self.hlpass = gtk.Entry() self.hlpass.set_text("low-pass") self.hbox.pack_start( gtk.Label("High/Low-pass: "), False, False, 0 ) self.hbox.pack_start( self.hlpass, False, False, 0 ) self.vbox.add(self.hbox) self.hbox = gtk.HBox() self.cutoff = gtk.Entry() self.cutoff.set_text("40") self.hbox.pack_start( gtk.Label("Cutoff: "), False, False, 0 ) self.hbox.pack_start( self.cutoff, False, False, 0 ) self.vbox.add(self.hbox) self.hbox = gtk.HBox() self.poles = gtk.Entry() self.poles.set_text("4") self.hbox.pack_start( gtk.Label("Poles: "), False, False, 0 ) self.hbox.pack_start( self.poles, False, False, 0 ) self.vbox.add(self.hbox) self.hbox = gtk.HBox() self.button = gtk.Button("High-Pass") self.button.connect("clicked", self.change, None) self.hbox.pack_start(self.button, False, False, 0 ) self.vbox.add(self.hbox) self.window.add(self.vbox) self.window.show_all() def main(self): self.gst() gtk.main() def gst(self): test = """ alsasrc device=hw:0 ! audioconvert ! audioresample ! audiocheblimit mode=low-pass cutoff=40 poles=4 name=tuneit ! level ! autoaudiosink """ self.pipeline = gst.parse_launch(test) self.bus = self.pipeline.get_bus() self.bus.add_signal_watch() self.bus.connect('message', self.playerbinMessage) self.pipeline.set_state(gst.STATE_PLAYING) def playerbinMessage(self,bus, message): if message.type == gst.MESSAGE_ELEMENT: struct = message.structure if struct.get_name() == 'level': print struct['peak'][0], struct['decay'][0], struct['rms'][0] #time.sleep(1) def change(self, widget, data=None): data = [self.hlpass.get_text(), self.cutoff.get_text(), self.poles.get_text()] print data[0], data[1], data[2] self.audiocheblimit = self.pipeline.get_by_name('tuneit') self.audiocheblimit.props.mode = data[0] self.audiocheblimit.props.cutoff = int( data[1] ) self.audiocheblimit.props.poles = int ( data[2] ) if __name__ == "__main__": hello = HelloWorld() hello.main() </code></pre> <p>Output low-pass:</p> <pre><code>-20.9227157774 -20.9227157774 -20.953279177 -20.9366239523 -20.9227157774 -20.9591815321 -20.9290995367 -20.9227157774 -20.9601319723 </code></pre> <p>Output high-pass:</p> <pre><code>-51.2328030138 -42.8335117509 -62.2730163502 -51.3932079772 -43.3559607159 -62.2080540769 -52.1412276733 -43.8784096809 -62.9151309943 </code></pre> <p><strong>EDIT:</strong></p> <pre><code>high-pass = speech and taking all audio low-pass = some audio like when you are talking near the microphone </code></pre>
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    1. PODetecting blowing on a microphone with GStreamer (or another library)
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