commit 7a87a213688c1905c43e6fe94b75ce9502fac356
Author: mheuer <malte.heuer@summitwave.eu>
Date:   Wed Oct 15 10:38:06 2025 +0200

    Initial Commit

diff --git a/# tone.py b/# tone.py
new file mode 100644
index 0000000..3a7a43b
--- /dev/null
+++ b/# tone.py	
@@ -0,0 +1,24 @@
+# tone.py
+import numpy as np
+import sounddevice as sd
+
+def play_tone(frequency=440.0, duration=1.0, volume=0.2, sample_rate=44_100):
+    """
+    Spielt einen Sinuston ab.
+    frequency: Hz
+    duration: Sekunden
+    volume: 0.0–1.0
+    sample_rate: Abtastrate in Hz
+    """
+    t = np.linspace(0, duration, int(sample_rate * duration), endpoint=False)
+    wave = (volume * np.sin(2 * np.pi * frequency * t)).astype(np.float32)
+    sd.play(wave, samplerate=sample_rate, blocking=True)
+
+if __name__ == "__main__":
+    import argparse
+    ap = argparse.ArgumentParser(description="Spiele einen Ton")
+    ap.add_argument("-f", "--frequency", type=float, default=440.0, help="Frequenz in Hz (z.B. 440)")
+    ap.add_argument("-t", "--time", type=float, default=1.0, help="Dauer in Sekunden (z.B. 1.5)")
+    ap.add_argument("-v", "--volume", type=float, default=0.2, help="Lautstärke 0.0–1.0")
+    args = ap.parse_args()
+    play_tone(args.frequency, args.time, args.volume)
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..21d0b89
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.venv/
diff --git a/latency_boxplot.png b/latency_boxplot.png
new file mode 100644
index 0000000..29d1292
Binary files /dev/null and b/latency_boxplot.png differ
diff --git a/latency_results.csv b/latency_results.csv
new file mode 100644
index 0000000..767096a
--- /dev/null
+++ b/latency_results.csv
@@ -0,0 +1,51 @@
+frequency_hz,trial_index,latency_ms,confidence
+300.0,0,-207.31400000022404,0.00622056501343238
+300.0,1,348.6330000000635,0.056284549811349935
+300.0,2,-143.1591666669192,0.038332755806023674
+300.0,3,-180.1999999997861,0.020459769531907698
+300.0,4,243.53600000040387,0.027538859419328387
+408.0,0,511.01566666693543,0.13034782307873757
+408.0,1,205.96383333304402,0.00602274978480801
+408.0,2,-156.44200000042474,0.006040940316049311
+408.0,3,321.73283333304425,0.013428349185833171
+408.0,4,-95.41566666666768,0.013516053778991198
+556.0,0,-51.99999999967986,0.008908330169987178
+556.0,1,163.87583333334987,0.012293108137542823
+556.0,2,20.89316666706509,0.013672583791677939
+556.0,3,92.36583333358794,0.08046100213143226
+556.0,4,496.5111666665507,0.03348673405585233
+756.0,0,-2.0180000001346343,0.0394411029185194
+756.0,1,1.150000000052387,0.03896462403988957
+756.0,2,206.1319999997977,0.8568158097486878
+756.0,3,209.28316666640967,0.8396316030225823
+756.0,4,211.58083333284594,0.8459048262785326
+1029.0,0,210.14933333344743,0.9530819615129752
+1029.0,1,210.65683333335983,0.9532782357410453
+1029.0,2,211.39866666680973,0.9518998263560067
+1029.0,3,211.22466666702167,0.9544329867247763
+1029.0,4,210.19283333362182,0.9053878364174661
+1400.0,0,210.17250000068088,0.9968093472420404
+1400.0,1,210.19466666621156,0.9966188177939429
+1400.0,2,210.24766666687356,0.9961348885445872
+1400.0,3,209.77616666687027,0.9955757851840116
+1400.0,4,211.357333333126,0.9945443953712811
+1905.0,0,211.82350000026418,0.9960441681665126
+1905.0,1,210.90266666669777,0.9961293380620004
+1905.0,2,210.557666666773,0.9968312654763809
+1905.0,3,212.87600000050588,0.9917235795474151
+1905.0,4,210.96283333326937,0.9972385928498976
+2592.0,0,211.56116666679736,0.9986127409307071
+2592.0,1,212.37466666707405,0.9959640592347981
+2592.0,2,212.0991666665759,0.9978592280151695
+2592.0,3,212.55183333323657,0.9980591577758795
+2592.0,4,212.1754999998302,0.998122763542641
+3527.0,0,212.77016666681448,0.9966566522428859
+3527.0,1,212.27300000055038,0.9977422314075753
+3527.0,2,212.0703333334859,0.9970086636719195
+3527.0,3,212.2191666667277,0.9930518500366761
+3527.0,4,212.39983333362034,0.9958515430059891
+4800.0,0,212.03550000018367,0.9362108622164094
+4800.0,1,212.61533333336047,0.9542874220201463
+4800.0,2,212.76416666660225,0.9675263253369292
+4800.0,3,212.87066666673127,0.9592850324828915
+4800.0,4,213.04566666685787,0.9851714795883683
diff --git a/latency_sweep.py b/latency_sweep.py
new file mode 100644
index 0000000..7e96a65
--- /dev/null
+++ b/latency_sweep.py
@@ -0,0 +1,181 @@
+#!/usr/bin/env python3
+import argparse
+import csv
+from dataclasses import dataclass
+import numpy as np
+import sounddevice as sd
+import matplotlib
+matplotlib.use("Agg")  # Dateiausgabe ohne GUI; mit --show wird umgestellt
+import matplotlib.pyplot as plt
+
+# ---------- Audio/Signal-Helfer ----------
+@dataclass
+class Times:
+    dac_first_time: float | None = None
+    adc_first_time: float | None = None
+
+def generate_tone(f_hz: float, dur_s: float, fs: int, volume: float,
+                  pre_silence: float = 0.20, post_silence: float = 0.40):
+    """Stille + Sinus + Stille (mit 5ms Fade-in/out)."""
+    n_pre = int(pre_silence * fs)
+    n_tone = int(dur_s * fs)
+    n_post = int(post_silence * fs)
+    t = np.arange(n_tone) / fs
+    tone = np.sin(2 * np.pi * f_hz * t).astype(np.float32)
+    fade_n = max(1, int(0.005 * fs))
+    w = np.ones_like(tone)
+    w[:fade_n] *= np.linspace(0, 1, fade_n, endpoint=False)
+    w[-fade_n:] *= np.linspace(1, 0, fade_n, endpoint=False)
+    ref = (volume * tone * w).astype(np.float32)
+    out = np.concatenate([np.zeros(n_pre, dtype=np.float32), ref, np.zeros(n_post, dtype=np.float32)])
+    return out, ref, n_pre
+
+def detect_onset_xcorr(signal: np.ndarray, ref: np.ndarray):
+    """Normierte Kreuzkorrelation; liefert Onset-Index und Confidence."""
+    x = signal.astype(np.float64)
+    r = ref.astype(np.float64)
+    M, N = len(r), len(x)
+    if N < M + 1:
+        return 0, np.array([0.0]), 0.0
+    # einfache Vor-Whitening (Hochpass) stabilisiert
+    xw = np.concatenate([[x[0]], x[1:] - 0.97 * x[:-1]])
+    rw = np.concatenate([[r[0]], r[1:] - 0.97 * r[:-1]])
+    corr = np.correlate(xw, rw, mode="valid")
+    x2 = xw**2
+    cs = np.concatenate([[0.0], np.cumsum(x2)])
+    E_x = cs[M:] - cs[:-M]
+    E_r = np.sum(rw**2) + 1e-20
+    nrm = np.sqrt(E_x * E_r) + 1e-20
+    nxc = corr / nrm
+    k = int(np.argmax(nxc))
+    conf = float(nxc[k])
+    return k, nxc, conf
+
+def measure_latency_once(freq_hz: float, fs: int, dur_s: float, volume: float,
+                         indev: int | None, outdev: int | None,
+                         pre_silence: float = 0.20, post_silence: float = 0.40):
+    """Spielt einen Ton, nimmt parallel auf, schätzt Latenz in ms, gibt Confidence zurück."""
+    play_buf, ref, _ = generate_tone(freq_hz, dur_s, fs, volume, pre_silence, post_silence)
+    record_buf = []
+    written = 0
+    times = Times()
+
+    def cb(indata, outdata, frames, time_info, status):
+        nonlocal written, times
+        if status:
+            # Ausgabe nur informativ; Xruns etc. beeinflussen Latenz
+            print(status, flush=True)
+        if times.adc_first_time is None:
+            times.adc_first_time = time_info.inputBufferAdcTime
+
+        chunk = play_buf[written:written+frames]
+        out = np.zeros((frames,), dtype=np.float32)
+        if len(chunk) > 0:
+            out[:len(chunk)] = chunk
+
+        if times.dac_first_time is None and np.any(out != 0.0):
+            first_nz = int(np.argmax(out != 0.0))
+            times.dac_first_time = time_info.outputBufferDacTime + first_nz / fs
+
+        outdata[:] = out.reshape(-1, 1)
+        record_buf.append(indata.copy().reshape(-1))
+        written += frames
+
+    stream_kwargs = dict(samplerate=fs, dtype="float32", channels=1)
+    if indev is not None or outdev is not None:
+        stream_kwargs["device"] = (indev, outdev)
+
+    with sd.Stream(callback=cb, **stream_kwargs):
+        sd.sleep(int(1000 * (len(play_buf) / fs)))
+        sd.sleep(200)
+
+    if times.adc_first_time is None or times.dac_first_time is None or not record_buf:
+        return np.nan, 0.0
+
+    rec = np.concatenate(record_buf).astype(np.float32)
+    onset_idx, _, conf = detect_onset_xcorr(rec, ref)
+    adc_detect_time = times.adc_first_time + onset_idx / fs
+    latency_ms = (adc_detect_time - times.dac_first_time) * 1000.0
+    return float(latency_ms), conf
+
+# ---------- Sweep-Runner & Plot ----------
+def run_sweep(freqs, repeats, fs, dur, vol, indev, outdev, conf_min):
+    results = {float(f): [] for f in freqs}
+    confs   = {float(f): [] for f in freqs}
+    for f in freqs:
+        for _ in range(repeats):
+            lat_ms, conf = measure_latency_once(f, fs, dur, vol, indev, outdev)
+            results[float(f)].append(lat_ms)
+            confs[float(f)].append(conf)
+            print(f"f={f:.1f} Hz  ->  latency={lat_ms:.2f} ms   conf={conf:.3f}")
+    # Markiere zu schwache Messungen (Confidence)
+    bad = sum((np.isnan(v) or c < conf_min) for arr, carr in zip(results.values(), confs.values()) for v, c in zip(arr, carr))
+    if bad > 0:
+        print(f"Warnung: {bad} Messungen mit niedriger Confidence (< {conf_min}) oder NaN.")
+    return results, confs
+
+def save_csv(path, results, confs):
+    with open(path, "w", newline="") as f:
+        w = csv.writer(f)
+        w.writerow(["frequency_hz", "trial_index", "latency_ms", "confidence"])
+        for f_hz, arr in results.items():
+            for i, lat in enumerate(arr):
+                w.writerow([f_hz, i, lat, confs[f_hz][i]])
+
+def plot_boxplot(path_png, results, show=False):
+    freqs = sorted(results.keys())
+    data = [results[f] for f in freqs]
+    fig = plt.figure(figsize=(10, 5))
+    plt.title("Akustische Latenz über Frequenz (Boxplot je 5 Wiederholungen)")
+    plt.boxplot(data, positions=range(len(freqs)), manage_ticks=False)
+    # Mittelwerte als Linie
+    means = [np.nanmean(arr) if len(arr) else np.nan for arr in data]
+    plt.plot(range(len(freqs)), means, marker="o", linestyle="--", label="Mittelwert")
+    plt.xticks(range(len(freqs)), [f"{int(f)}" for f in freqs])
+    plt.xlabel("Frequenz [Hz]")
+    plt.ylabel("Latenz [ms]")
+    plt.grid(True, axis="y", alpha=0.3)
+    plt.legend(loc="best")
+    plt.tight_layout()
+    plt.savefig(path_png, dpi=150)
+    print(f"Plot gespeichert: {path_png}")
+    if show:
+        plt.switch_backend("TkAgg")
+        plt.show()
+    plt.close(fig)
+
+def parse_freqs(arg: str | None, default_n: int = 10, fmin: float = 300.0, fmax: float = 4800.0):
+    """Erzeuge logarithmisch verteilte Defaults oder parse Kommata-Liste."""
+    if arg:
+        return np.array([float(x) for x in arg.split(",") if x.strip() != ""])
+    # 10 log-spaced Frequenzen (Laptop-Lautsprecher-freundlich)
+    return np.round(np.geomspace(fmin, fmax, default_n)).astype(float)
+
+def main():
+    ap = argparse.ArgumentParser(description="Mehrfachmessung akustischer Latenz über Frequenzpunkte")
+    ap.add_argument("--freqs", type=str, default=None,
+                    help="Kommagetrennt (z.B. 300,400,600,1000) – sonst 10 log-spaced 300..4800 Hz")
+    ap.add_argument("--repeats", type=int, default=5, help="Wiederholungen je Frequenz")
+    ap.add_argument("-r", "--samplerate", type=int, default=48_000, help="Samplerate")
+    ap.add_argument("-t", "--time", type=float, default=0.15, help="Tondauer (s)")
+    ap.add_argument("-v", "--volume", type=float, default=0.6, help="Lautstärke 0..1")
+    ap.add_argument("--indev", type=int, default=None, help="Input-Geräteindex")
+    ap.add_argument("--outdev", type=int, default=None, help="Output-Geräteindex")
+    ap.add_argument("--csv", type=str, default="latency_results.csv", help="CSV-Dateiname")
+    ap.add_argument("--png", type=str, default="latency_boxplot.png", help="PNG-Dateiname")
+    ap.add_argument("--show", action="store_true", help="Plot anzeigen (GUI notwendig)")
+    ap.add_argument("--conf-min", type=float, default=0.3, help="Warnschwelle für Confidence")
+    args = ap.parse_args()
+
+    freqs = parse_freqs(args.freqs)
+    print("Frequenzen:", ", ".join(f"{int(f)}" for f in freqs))
+    results, confs = run_sweep(freqs, args.repeats, args.samplerate, args.time,
+                               args.volume, args.indev, args.outdev, args.conf_min)
+    save_csv(args.csv, results, confs)
+    plot_boxplot(args.png, results, args.show)
+    # Kurze Zusammenfassung
+    means = {int(f): float(np.nanmean(v)) for f, v in results.items()}
+    print("Mittelwerte (ms):", means)
+
+if __name__ == "__main__":
+    main()
diff --git a/latenz.png b/latenz.png
new file mode 100644
index 0000000..a0b2790
Binary files /dev/null and b/latenz.png differ
diff --git a/mic_scope_smooth.py b/mic_scope_smooth.py
new file mode 100644
index 0000000..5d36d3e
--- /dev/null
+++ b/mic_scope_smooth.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python3
+import argparse, threading, os
+import numpy as np
+import sounddevice as sd
+import matplotlib
+# GUI-Backend wählen
+if os.environ.get("DISPLAY"):
+    matplotlib.use("TkAgg", force=True)
+else:
+    matplotlib.use("Agg", force=True)
+import matplotlib.pyplot as plt
+from matplotlib.animation import FuncAnimation
+
+def ema_update(prev, new, alpha):
+    return new if prev is None else (alpha * new + (1 - alpha) * prev)
+
+def main():
+    ap = argparse.ArgumentParser(description="Live Mic-Scope (glatt, autoscale, Clip-Anzeige)")
+    ap.add_argument("-r", "--samplerate", type=int, default=48_000)
+    ap.add_argument("-c", "--channels", type=int, default=1)
+    ap.add_argument("-b", "--blocksize", type=int, default=1024)
+    ap.add_argument("-w", "--window", type=float, default=0.8, help="Anzeigefenster in Sekunden")
+    ap.add_argument("--indev", type=int, default=None, help="Input-Geräteindex")
+    ap.add_argument("--gain", type=float, default=1.0, help="Anzeige-Gain (nur Darstellung)")
+    ap.add_argument("--smooth-ms", type=float, default=5.0, help="Glättung des Waveforms (ms)")
+    ap.add_argument("--level-ema", type=float, default=0.30, help="Level-EMA Zeitkonstante in s")
+    ap.add_argument("--autoscale", action="store_true", help="Automatische Y-Skalierung aktivieren")
+    ap.add_argument("--ymax", type=float, default=1.05, help="Fixe Y-Grenze, wenn Autoscale aus")
+    args = ap.parse_args()
+
+    fs = args.samplerate
+    nwin = int(args.window * fs)
+    buf = np.zeros(nwin, dtype=np.float32)
+    lock = threading.Lock()
+
+    # State
+    level_dbfs = None
+    peak_hold = 0.0
+    clip_pct = 0.0
+    disp_ymax = args.ymax if not args.autoscale else None  # wird dynamisch gesetzt
+
+    # Glättungskern (nur für Darstellung)
+    k = max(1, int(args.smooth_ms * fs / 1000))
+    kernel = np.ones(k, dtype=np.float32) / k if k > 1 else None
+
+    # Level-EMA Alpha aus Zeitkonstante
+    lvl_alpha = 1.0 - np.exp(-args.blocksize / (fs * max(1e-3, args.level_ema)))
+
+    def callback(indata, frames, time_info, status):
+        nonlocal buf, level_dbfs, peak_hold, clip_pct
+        if status:
+            print(status)
+        # nur erster Kanal
+        x = indata[:, 0].copy()
+        # Clip-Detektion (echtes Input-Clipping => abs(x) ~ 1.0)
+        c = np.mean(np.abs(x) >= 0.999)
+        clip_pct = 0.9 * clip_pct + 0.1 * c  # leicht glätten
+
+        # RMS -> dBFS (vor Gain, um echte Nähe zu 0 dBFS zu sehen)
+        rms = np.sqrt(np.mean(np.clip(x, -1.0, 1.0) ** 2) + 1e-20)
+        db = 20 * np.log10(rms)
+        level_dbfs = ema_update(level_dbfs, db, lvl_alpha)
+
+        # Ringpuffer
+        with lock:
+            if len(x) >= len(buf):
+                buf[:] = x[-len(buf):]
+            else:
+                buf[:-len(x)] = buf[len(x):]
+                buf[-len(x):] = x
+
+            # Peak-Hold (für Textanzeige)
+            peak = float(np.max(np.abs(x)))
+            peak_hold = max(peak, peak_hold * 0.95)  # langsamer Abkling
+
+    stream_kwargs = dict(samplerate=fs, channels=args.channels, dtype="float32", blocksize=args.blocksize)
+    if args.indev is not None:
+        stream_kwargs["device"] = (args.indev, None)
+
+    # Plot-Setup
+    fig, ax = plt.subplots(figsize=(10, 4))
+    t = np.linspace(-args.window, 0, nwin)
+    (line,) = ax.plot(t, np.zeros_like(t), lw=1)
+    ax.set_title("Mikrofon – Live Waveform (glättet & autoscaled)")
+    ax.set_xlabel("Zeit [s]"); ax.set_ylabel("Amplitude")
+    ax.set_ylim(-args.ymax, args.ymax)
+    ax.grid(True, alpha=0.3)
+    txt = ax.text(0.01, 0.92, "", ha="left", va="center", transform=ax.transAxes)
+    clip_txt = ax.text(0.99, 0.92, "", ha="right", va="center", transform=ax.transAxes)
+
+    # weiche Autoscale-EMA für Y-Limits
+    y_ema = None
+    y_alpha = 0.15  # Höhere Werte => schnellere Anpassung
+
+    def update(_frame):
+        nonlocal disp_ymax, y_ema
+        with lock:
+            y = buf.copy()
+
+        # Anzeige-Gain
+        y *= args.gain
+
+        # Glättung nur für Darstellung
+        if kernel is not None and len(y) >= len(kernel):
+            y = np.convolve(y, kernel, mode="same")
+
+        # Autoscale (robust): Ziel = 95. Perzentil(|y|) * 1.2
+        if args.autoscale:
+            target = float(np.percentile(np.abs(y), 95)) * 1.2
+            target = max(target, 0.2)  # minimal sinnvoller Bereich
+            y_ema = ema_update(y_ema, target, y_alpha)
+            disp_ymax = max(0.2, min(1.5 * args.gain, y_ema))  # clamp
+            ax.set_ylim(-disp_ymax, +disp_ymax)
+
+        line.set_ydata(y)
+
+        # Info-Text
+        db = level_dbfs if level_dbfs is not None else -np.inf
+        txt.set_text(f"Level: {db:6.1f} dBFS   Peak: {peak_hold*args.gain:0.2f}   Gain: {args.gain:g}"
+                     + (f"   Y±{disp_ymax:0.2f}" if args.autoscale else f"   Y±{args.ymax:0.2f}"))
+
+        # Clip-Warnung (rot, wenn >0.5% geclippt)
+        if clip_pct > 0.005:
+            clip_txt.set_text(f"CLIP {clip_pct*100:4.1f}%")
+            clip_txt.set_color("red")
+        else:
+            clip_txt.set_text("")
+        return line, txt, clip_txt
+
+    with sd.InputStream(callback=callback, **stream_kwargs):
+        ani = FuncAnimation(fig, update, interval=33, blit=False)  # ~30 FPS
+        print("Live-Ansicht läuft. Fenster schließen oder Strg+C zum Beenden.")
+        plt.show()
+
+if __name__ == "__main__":
+    main()
diff --git a/mic_scope_smooth_spectrum.py b/mic_scope_smooth_spectrum.py
new file mode 100644
index 0000000..96f8562
--- /dev/null
+++ b/mic_scope_smooth_spectrum.py
@@ -0,0 +1,196 @@
+#!/usr/bin/env python3
+import argparse, threading, os
+import numpy as np
+import sounddevice as sd
+import matplotlib
+# GUI-Backend wählen
+if os.environ.get("DISPLAY"):
+    matplotlib.use("TkAgg", force=True)
+else:
+    matplotlib.use("Agg", force=True)
+import matplotlib.pyplot as plt
+from matplotlib.animation import FuncAnimation
+
+def ema_update(prev, new, alpha):
+    return new if prev is None else (alpha * new + (1 - alpha) * prev)
+
+def dbfs(x):
+    return 20.0 * np.log10(np.maximum(x, 1e-20))
+
+def main():
+    ap = argparse.ArgumentParser(description="Live Mic-Scope (ruhiges Zeitbild + Frequenzband)")
+    # Audio
+    ap.add_argument("-r", "--samplerate", type=int, default=48_000)
+    ap.add_argument("-c", "--channels", type=int, default=1)
+    ap.add_argument("-b", "--blocksize", type=int, default=1024)
+    ap.add_argument("--indev", type=int, default=None, help="Input-Geräteindex")
+    # Zeitansicht
+    ap.add_argument("-w", "--window", type=float, default=0.8, help="Zeitfenster (s)")
+    ap.add_argument("--gain", type=float, default=1.0, help="Anzeige-Gain (nur Darstellung)")
+    ap.add_argument("--smooth-ms", type=float, default=6.0, help="Glättung Waveform (ms)")
+    ap.add_argument("--level-ema", type=float, default=0.30, help="Level-EMA Zeitkonstante (s)")
+    ap.add_argument("--autoscale", action="store_true", help="Automatische Y-Skalierung aktivieren")
+    ap.add_argument("--ymax", type=float, default=1.05, help="Fixe Y-Grenze, wenn Autoscale aus")
+    # Spektrum
+    ap.add_argument("--fft-n", type=int, default=4096, help="FFT-Punkte (wird auf nächste 2er-Potenz gerundet)")
+    ap.add_argument("--spec-ema", type=float, default=0.30, help="Spektral-EMA Zeitkonstante (s)")
+    ap.add_argument("--fmin", type=float, default=20.0, help="untere Frequenzgrenze (Hz)")
+    ap.add_argument("--fmax", type=float, default=20000.0, help="obere Frequenzgrenze (Hz)")
+    ap.add_argument("--logx", action="store_true", help="logarithmische Frequenzachse")
+    args = ap.parse_args()
+
+    fs = args.samplerate
+    nwin = int(args.window * fs)
+    buf = np.zeros(nwin, dtype=np.float32)
+    lock = threading.Lock()
+
+    # --- Zustände ---
+    level_dbfs = None
+    peak_hold = 0.0
+    clip_pct = 0.0
+
+    # Waveform-Glättungskern (nur Anzeige)
+    k = max(1, int(args.smooth_ms * fs / 1000.0))
+    kernel = np.ones(k, dtype=np.float32) / k if k > 1 else None
+
+    # EMA-Alphas aus Zeitkonstanten
+    lvl_alpha = 1.0 - np.exp(-args.blocksize / (fs * max(1e-3, args.level_ema)))
+    spec_alpha = 1.0 - np.exp(-args.blocksize / (fs * max(1e-3, args.spec_ema)))
+
+    # Spektrum-Setup
+    # nächstgrößere 2er-Potenz für FFT
+    nfft = 1 << (int(np.ceil(np.log2(max(256, args.fft_n)))))
+    hann = np.hanning(nfft).astype(np.float32)
+    spec_db = None  # für EMA
+    # Frequenzachse & Sichtfenster
+    freqs = np.fft.rfftfreq(nfft, 1.0 / fs)
+    fmask = (freqs >= args.fmin) & (freqs <= args.fmax)
+    if not np.any(fmask):
+        fmask[:] = True  # Fallback: alles zeigen
+
+    def callback(indata, frames, time_info, status):
+        nonlocal buf, level_dbfs, peak_hold, clip_pct
+        if status:
+            print(status)
+        x = indata[:, 0].astype(np.float32, copy=True)
+
+        # Clip-Detektion
+        c = np.mean(np.abs(x) >= 0.999)
+        clip_pct = 0.9 * clip_pct + 0.1 * c
+
+        # RMS -> dBFS (vor Anzeige-Gain)
+        rms = np.sqrt(np.mean(np.clip(x, -1.0, 1.0) ** 2) + 1e-20)
+        level_dbfs = ema_update(level_dbfs, 20 * np.log10(rms), lvl_alpha)
+
+        # Ringpuffer aktualisieren
+        with lock:
+            if len(x) >= len(buf):
+                buf[:] = x[-len(buf):]
+            else:
+                buf[:-len(x)] = buf[len(x):]
+                buf[-len(x):] = x
+
+            # Peak-Hold
+            peak = float(np.max(np.abs(x)))
+            peak_hold = max(peak, peak_hold * 0.95)
+
+    # --- Plot-Setup: zwei Spalten nebeneinander ---
+    fig, (ax_t, ax_f) = plt.subplots(1, 2, figsize=(12, 4))
+    # Zeitdiagramm
+    t = np.linspace(-args.window, 0, nwin)
+    (line_t,) = ax_t.plot(t, np.zeros_like(t), lw=1)
+    ax_t.set_title("Zeitbereich (glättet & autoscaled)")
+    ax_t.set_xlabel("Zeit [s]"); ax_t.set_ylabel("Amplitude")
+    ax_t.set_ylim(-args.ymax, args.ymax); ax_t.grid(True, alpha=0.3)
+    txt = ax_t.text(0.01, 0.92, "", ha="left", va="center", transform=ax_t.transAxes)
+    clip_txt = ax_t.text(0.99, 0.92, "", ha="right", va="center", transform=ax_t.transAxes)
+
+    # Frequenzdiagramm
+    (line_f,) = ax_f.plot(freqs[fmask], np.full(np.count_nonzero(fmask), -120.0), lw=1)
+    ax_f.set_title("Frequenzband (dBFS)")
+    ax_f.set_xlabel("Frequenz [Hz]"); ax_f.set_ylabel("Pegel [dBFS]")
+    ax_f.grid(True, alpha=0.3)
+    if args.logx:
+        ax_f.set_xscale("log")
+    ax_f.set_xlim(freqs[fmask][0], freqs[fmask][-1])
+    ax_f.set_ylim(-120, 0)
+    peak_marker = ax_f.axvline(x=1000, linestyle="--", alpha=0.7)
+    peak_text = ax_f.text(0.98, 0.92, "", ha="right", va="center", transform=ax_f.transAxes)
+
+    # Autoscale der Zeitansicht
+    y_ema = None
+    y_alpha = 0.15
+    disp_ymax = args.ymax
+
+    def update(_frame):
+        nonlocal spec_db, y_ema, disp_ymax
+        with lock:
+            y = buf.copy()
+
+        # ---- Zeitbereich (links) ----
+        y_plot = y * args.gain
+        if kernel is not None and len(y_plot) >= len(kernel):
+            y_plot = np.convolve(y_plot, kernel, mode="same")
+
+        if args.autoscale:
+            target = float(np.percentile(np.abs(y_plot), 95)) * 1.2
+            target = max(target, 0.2)
+            y_ema = ema_update(y_ema, target, y_alpha)
+            disp_ymax = max(0.2, min(1.5 * args.gain, y_ema))
+            ax_t.set_ylim(-disp_ymax, +disp_ymax)
+        line_t.set_ydata(y_plot)
+
+        db = level_dbfs if level_dbfs is not None else -np.inf
+        txt.set_text(f"Level: {db:6.1f} dBFS   Peak: {peak_hold*args.gain:0.2f}   Gain: {args.gain:g}"
+                     + (f"   Y±{disp_ymax:0.2f}" if args.autoscale else f"   Y±{args.ymax:0.2f}"))
+
+        if clip_pct > 0.005:
+            clip_txt.set_text(f"CLIP {clip_pct*100:4.1f}%")
+            clip_txt.set_color("red")
+        else:
+            clip_txt.set_text("")
+
+        # ---- Frequenzband (rechts) ----
+        # nimm den letzten nfft-Slice aus dem Ringpuffer
+        xfft = y[-nfft:].astype(np.float32, copy=False)
+        if xfft.size < nfft:
+            pad = np.zeros(nfft - xfft.size, dtype=np.float32)
+            xfft = np.concatenate([pad, xfft])
+        # Hann-Fenster & FFT
+        xw = xfft * hann
+        spec = np.fft.rfft(xw, n=nfft)
+        mag = np.abs(spec) / (np.sum(hann) / 2.0)  # grobe Amplitudenkalibrierung
+        spec_linear = mag
+
+        # Spektral-EMA (über Frames)
+        spec_db_inst = dbfs(spec_linear)
+        if spec_db is None:
+            spec_db = spec_db_inst
+        else:
+            spec_db = spec_alpha * spec_db_inst + (1 - spec_alpha) * spec_db
+
+        # Anzeige beschränken
+        yspec = spec_db[fmask]
+        line_f.set_ydata(yspec)
+
+        # Peak suchen im Sichtfenster
+        idx_pk = int(np.nanargmax(yspec))
+        f_pk = float(freqs[fmask][idx_pk])
+        v_pk = float(yspec[idx_pk])
+        peak_marker.set_xdata([f_pk, f_pk])
+        peak_text.set_text(f"Peak: {f_pk:0.0f} Hz / {v_pk:0.1f} dBFS")
+
+        return line_t, txt, clip_txt, line_f, peak_marker, peak_text
+
+    stream_kwargs = dict(samplerate=fs, channels=args.channels, dtype="float32", blocksize=args.blocksize)
+    if args.indev is not None:
+        stream_kwargs["device"] = (args.indev, None)
+
+    with sd.InputStream(callback=callback, **stream_kwargs):
+        ani = FuncAnimation(fig, update, interval=33, blit=False)  # ~30 FPS
+        print("Live-Ansicht läuft. Fenster schließen oder Strg+C zum Beenden.")
+        plt.tight_layout()
+        plt.show()
+
+if __name__ == "__main__":
+    main()
diff --git a/tone.py b/tone.py
new file mode 100644
index 0000000..9c3ce1a
--- /dev/null
+++ b/tone.py
@@ -0,0 +1,23 @@
+import numpy as np
+import sounddevice as sd
+
+def play_tone(frequency=440.0, duration=1.0, volume=0.2, sample_rate=44_100):
+    """
+    Spielt einen Sinuston ab.
+    frequency: Hz
+    duration: Sekunden
+    volume: 0.0–1.0
+    sample_rate: Abtastrate in Hz
+    """
+    t = np.linspace(0, duration, int(sample_rate * duration), endpoint=False)
+    wave = (volume * np.sin(2 * np.pi * frequency * t)).astype(np.float32)
+    sd.play(wave, samplerate=sample_rate, blocking=True)
+
+if __name__ == "__main__":
+    import argparse
+    ap = argparse.ArgumentParser(description="Spiele einen Ton")
+    ap.add_argument("-f", "--frequency", type=float, default=440.0, help="Frequenz in Hz (z.B. 440)")
+    ap.add_argument("-t", "--time", type=float, default=1.0, help="Dauer in Sekunden (z.B. 1.5)")
+    ap.add_argument("-v", "--volume", type=float, default=0.2, help="Lautstärke 0.0–1.0")
+    args = ap.parse_args()
+    play_tone(args.frequency, args.time, args.volume)