SignalFrameController.py 文件源码

def on_bandpass_filter_triggered(self, f_low: float, f_high: float):
        self.filter_abort_wanted = False

        QApplication.instance().setOverrideCursor(Qt.WaitCursor)
        filter_bw = Filter.read_configured_filter_bw()
        filtered = Array("f", 2 * self.signal.num_samples)
        p = Process(target=perform_filter, args=(filtered, self.signal.data, f_low, f_high, filter_bw))
        p.daemon = True
        p.start()

        while p.is_alive():
            QApplication.instance().processEvents()

            if self.filter_abort_wanted:
                p.terminate()
                p.join()
                QApplication.instance().restoreOverrideCursor()
                return

            time.sleep(0.1)

        filtered = np.frombuffer(filtered.get_obj(), dtype=np.complex64)
        signal = self.signal.create_new(new_data=filtered.astype(np.complex64))
        signal.name = self.signal.name + " filtered with f_low={0:.4n} f_high={1:.4n} bw={2:.4n}".format(f_low, f_high,
                                                                                                         filter_bw)
        self.signal_created.emit(signal)
        QApplication.instance().restoreOverrideCursor()