Add spectrogram viewer with FFT bandpass filter, file browser, zoom/pan controls

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
2026-03-27 21:56:47 -07:00
parent b32f9edd5f
commit c5234d5799
14 changed files with 106774 additions and 3 deletions
@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+"""
+Generate test WAV files with a 1kHz sine wave tone at different sample rates.
+"""
+
+import wave
+import struct
+import math
+import os
+
+def generate_tone_wav(filename, sample_rate, duration_sec=2.0, frequency=1000.0, amplitude=0.5):
+    """
+    Generate a WAV file with a single sine wave tone.
+    
+    Args:
+        filename: Output WAV file path
+        sample_rate: Sample rate in Hz (e.g., 16000, 22050, 44100)
+        duration_sec: Duration in seconds
+        frequency: Tone frequency in Hz
+        amplitude: Amplitude 0.0-1.0
+    """
+    num_samples = int(sample_rate * duration_sec)
+    
+    # Generate samples
+    samples = []
+    for i in range(num_samples):
+        t = i / sample_rate
+        sample = amplitude * math.sin(2 * math.pi * frequency * t)
+        # Convert to 16-bit PCM
+        sample_int = int(sample * 32767)
+        samples.append(sample_int)
+    
+    # Write WAV file
+    with wave.open(filename, 'w') as wav_file:
+        wav_file.setnchannels(1)  # Mono
+        wav_file.setsampwidth(2)  # 16-bit (2 bytes)
+        wav_file.setframerate(sample_rate)
+        
+        for sample in samples:
+            wav_file.writeframes(struct.pack('<h', sample))  # Little-endian 16-bit
+    
+    print(f"Created: {filename}")
+    print(f"  Sample Rate: {sample_rate} Hz")
+    print(f"  Duration: {duration_sec} sec")
+    print(f"  Frequency: {frequency} Hz")
+    print(f"  Samples: {num_samples}")
+    print()
+
+def main():
+    # Get the directory where this script is located
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    
+    # Test frequencies and sample rates
+    tone_frequency = 1000.0  # 1 kHz tone
+    
+    sample_rates = [
+        (16000, "16k"),
+        (22050, "22k"), 
+        (44100, "44k"),
+    ]
+    
+    print(f"Generating {tone_frequency} Hz test tones at different sample rates...\n")
+    
+    for sample_rate, suffix in sample_rates:
+        filename = os.path.join(script_dir, f"test_tone_{suffix}_{int(tone_frequency)}hz.wav")
+        generate_tone_wav(filename, sample_rate, duration_sec=2.0, frequency=tone_frequency)
+    
+    print("Done! Copy these WAV files to your spectrogram viewer to test.")
+    print("\nExpected display:")
+    print("  - 16k file: Tone should appear at 1kHz (1/8 of max 8kHz)")
+    print("  - 22k file: Tone should appear at 1kHz (~1/11 of max 11kHz)")
+    print("  - 44k file: Tone should appear at 1kHz (~1/22 of max 22kHz)")
+
+if __name__ == "__main__":
+    main()