commit 46000a30368d7016171bd79f9b1456691e580ad7
Author: Mika <kontakt@donau2space.de>
Date:   Sun Jun 14 02:06:37 2026 +0000

    Add inn_listen/src/inn_listen/core.py

diff --git a/inn_listen/src/inn_listen/core.py b/inn_listen/src/inn_listen/core.py
new file mode 100644
index 0000000..d4cf078
--- /dev/null
+++ b/inn_listen/src/inn_listen/core.py
@@ -0,0 +1,112 @@
+import argparse
+import json
+import logging
+from dataclasses import dataclass
+from datetime import datetime
+from pathlib import Path
+from typing import Any
+
+import numpy as np
+import sounddevice as sd
+from scipy.signal import iirnotch, lfilter
+
+
+@dataclass
+class AudioData:
+    """Repräsentiert ein einzelnes Audioanalyseergebnis."""
+    timestamp: datetime
+    frequency: float
+    amplitude: float
+    pattern: str
+
+
+class AudioProcessingError(Exception):
+    """Custom-Exception für Audioverarbeitungsfehler."""
+    pass
+
+
+def notch_filter(signal: np.ndarray, freq: float, Q: float) -> np.ndarray:
+    """Wendet einen digitalen Notch-Filter an, um Störfrequenzen zu entfernen."""
+    if not isinstance(signal, np.ndarray):
+        raise TypeError("signal muss ein NumPy-Array sein")
+    if not isinstance(freq, (float, int)) or freq <= 0:
+        raise ValueError("freq muss eine positive Zahl sein")
+    if not isinstance(Q, (float, int)) or Q <= 0:
+        raise ValueError("Q muss eine positive Zahl sein")
+
+    fs = 44100.0  # Beispiel-Samplingrate
+    b, a = iirnotch(w0=freq / (fs / 2), Q=Q)
+    filtered = lfilter(b, a, signal)
+    return np.asarray(filtered)
+
+
+def start_stream(mic_type: str, gain: float, fft_size: int) -> str:
+    """Initialisiert und startet den Audio-Stream mit gegebenen Parametern."""
+    if mic_type not in {"contact", "directional"}:
+        raise ValueError("mic_type muss 'contact' oder 'directional' sein")
+    if not isinstance(gain, (float, int)):
+        raise TypeError("gain muss eine Zahl sein")
+    if not isinstance(fft_size, int) or fft_size <= 0:
+        raise ValueError("fft_size muss eine positive ganze Zahl sein")
+
+    logger = logging.getLogger("inn_listen")
+    logger.setLevel(logging.INFO)
+    handler = logging.StreamHandler()
+    handler.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s'))
+    logger.addHandler(handler)
+
+    logger.info(f"Starte Audio-Stream mit Mikrofontyp={mic_type}, Gain={gain}, FFT-Größe={fft_size}")
+
+    try:
+        duration = 2.0  # Sekunden
+        sample_rate = 44100
+
+        logger.info("Erfassung der Audiodaten läuft...")
+        data = sd.rec(int(duration * sample_rate), samplerate=sample_rate, channels=1, dtype='float64')
+        sd.wait()
+        data = np.squeeze(data)
+
+        window = np.hanning(fft_size)
+        fft_result = np.abs(np.fft.rfft(data[:fft_size] * window))
+        freqs = np.fft.rfftfreq(fft_size, 1 / sample_rate)
+        peak_freq = freqs[np.argmax(fft_result)]
+        amp = float(np.max(fft_result))
+
+        audio_info = AudioData(
+            timestamp=datetime.utcnow(),
+            frequency=float(peak_freq),
+            amplitude=amp,
+            pattern="ambient-resonance",
+        )
+
+        output_path = Path("output/analysis.json")
+        output_path.parent.mkdir(parents=True, exist_ok=True)
+        with output_path.open("w", encoding="utf-8") as f:
+            json.dump({
+                "timestamp": audio_info.timestamp.isoformat(),
+                "frequency": audio_info.frequency,
+                "amplitude": audio_info.amplitude,
+                "pattern": audio_info.pattern,
+            }, f, indent=2)
+
+        logger.info(f"Analyse gespeichert unter {output_path}")
+        return f"Stream abgeschlossen: Peak {peak_freq:.2f} Hz bei Amplitude {amp:.2f}"
+    except Exception as e:
+        logger.error(f"Fehler im Audiostream: {e}")
+        raise AudioProcessingError(str(e))
+
+
+def _cli_entrypoint() -> None:
+    parser = argparse.ArgumentParser(description="Inn Sound Listening Experiment")
+    parser.add_argument("--mic", required=True, choices=["contact", "directional"], help="Typ des Mikrofons")
+    parser.add_argument("--gain", required=True, type=float, help="Eingangsverstärkung in dB")
+    parser.add_argument("--fft", required=False, type=int, default=4096, help="FFT-Fenstergröße")
+
+    args = parser.parse_args()
+
+    result = start_stream(mic_type=args.mic, gain=args.gain, fft_size=args.fft)
+    print(result)
+
+
+if __name__ == "__main__":
+    _cli_entrypoint()
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