tools: WIP on PDM<->PCM conversion in Python

First test signal does not seem correct...

1 files changed, 37 insertions, 0 deletions

diff --git a/tools/testsignal.py b/tools/testsignal.py
new file mode 100644
index 0000000..0f28e1c
--- /dev/null
+++ b/tools/testsignal.py
@@ -0,0 +1,37 @@
+import numpy as np
+import soundfile as sf
+
+def generate_test_tone(
+    duration_sec=5,
+    sample_rate=44100,
+    freqs=[440, 1000, 3000],
+    noise_level=0.05,
+    amplitude=0.5,
+):
+    t = np.linspace(0, duration_sec, int(sample_rate * duration_sec), endpoint=False)
+    signal = np.zeros_like(t)
+
+    # Add multiple sine waves
+    for freq in freqs:
+        signal += amplitude * np.sin(2 * np.pi * freq * t)
+
+    # Normalize to avoid clipping if multiple frequencies are added
+    signal /= len(freqs)
+
+    # Add white noise
+    noise = noise_level * np.random.normal(0, 1, signal.shape)
+    signal += noise
+
+    return signal
+
+if __name__ == "__main__":
+
+    filename="test_tone.wav"
+    # Save to WAV file
+    
+    sample_rate = 16000
+
+    signal = generate_test_tone(sample_rate=sample_rate)
+
+    sf.write(filename, signal, sample_rate)
+    print(f"Saved test tone to '{filename}'.")