From d68fa4782e971b8ea41204ef5898141efcb243af Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Wed, 18 Feb 2026 05:36:49 +0100
Subject: test(mq_editor): add isolated FFT test page and sine generator

- tools/mq_editor/test_fft.html: browser test for fft.js (12 tests:
  DC impulse, single tone, STFT magnitude, pairs, triplets)
- tools/gen_sine_440.py: generate 1s 440Hz WAV at 32kHz for manual testing

handoff(Gemini): FFT isolation tests added, all passing in browser.
---
 tools/gen_sine_440.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 tools/gen_sine_440.py

(limited to 'tools/gen_sine_440.py')

diff --git a/tools/gen_sine_440.py b/tools/gen_sine_440.py
new file mode 100644
index 0000000..6458dc8
--- /dev/null
+++ b/tools/gen_sine_440.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+import wave, struct, math
+
+SAMPLE_RATE = 32000
+FREQ = 440.0
+DURATION = 1.0
+AMPLITUDE = 32767
+
+samples = [int(AMPLITUDE * math.sin(2 * math.pi * FREQ * i / SAMPLE_RATE))
+           for i in range(int(SAMPLE_RATE * DURATION))]
+
+with wave.open("sine_440.wav", "w") as f:
+    f.setnchannels(1)
+    f.setsampwidth(2)
+    f.setframerate(SAMPLE_RATE)
+    f.writeframes(struct.pack(f"<{len(samples)}h", *samples))
+
+print(f"Written sine_440.wav: {FREQ}Hz, {DURATION}s, {SAMPLE_RATE}Hz mono")
-- 
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