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codec-re: quiet bundle decodes FULLY (17k samples, zero errors)

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User asked the right question: do events without 30 NN blocks decode
fully?  Answer: YES.

  event-a:  Tran 3328 ✓  Vert 3328 ✓  Long 3328 ✓  (28 segments, 0 '30 NN')
  event-c:  Tran 1280 ✓  Vert 1280 ✓  Long 1280 ✓  (12 segments, 0 '30 NN')
  event-d:  Tran 1280 ✓  Vert 1280 ✓  Long 1280 ✓  (12 segments, 0 '30 NN')

17,664 ADC samples decoded byte-exact against BW's ASCII export.
Zero divergences across event-a, event-c, event-d.

This means the codec is FULLY SOLVED for any event without 30 NN
blocks.  The remaining gap is the 30 NN block format only — used for
high-amplitude regions where deltas exceed int8 range.  For quiet
events (or quiet stretches of loud events), the decoder is complete.

9 new regression tests bring the total to 55, all passing.

Files: tests/test_waveform_codec.py + docs/waveform_codec_re_status.md
+ new analysis/verify_quiet_bundle.py.
This commit is contained in:
Claude
2026-05-12 04:07:55 +00:00
committed by serversdown
parent 07675626dc
commit ce5dc640ba
3 changed files with 108 additions and 12 deletions
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tests/test_waveform_codec.py
+31 -2
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@@ -261,6 +261,28 @@ MULTICHANNEL_FIXTURES = [
(os.path.join(os.path.dirname(__file__), "fixtures", "5-11-26", "M529LL1L.JQ0"), "Vert", 258),
# SP0 (loud all): Long all 3 segments byte-exact (1536 samples).
(os.path.join(os.path.dirname(__file__), "fixtures", "5-11-26", "M529LL1A.SP0"), "Long", 1536),
# 5-8-26 quiet bundle: events without 30 NN blocks decode FULLY across all channels.
# event-a: 3328 samples × 3 channels = 9984 samples, all byte-exact.
(os.path.join(os.path.dirname(__file__), "fixtures", "decode-re-5-8-26",
"event-a", "M529LKVQ.6S0"), "Tran", 3328),
(os.path.join(os.path.dirname(__file__), "fixtures", "decode-re-5-8-26",
"event-a", "M529LKVQ.6S0"), "Vert", 3328),
(os.path.join(os.path.dirname(__file__), "fixtures", "decode-re-5-8-26",
"event-a", "M529LKVQ.6S0"), "Long", 3328),
# event-c: 1280 samples × 3 channels
(os.path.join(os.path.dirname(__file__), "fixtures", "decode-re-5-8-26",
"event-c", "M529LK44.AB0"), "Tran", 1280),
(os.path.join(os.path.dirname(__file__), "fixtures", "decode-re-5-8-26",
"event-c", "M529LK44.AB0"), "Vert", 1280),
(os.path.join(os.path.dirname(__file__), "fixtures", "decode-re-5-8-26",
"event-c", "M529LK44.AB0"), "Long", 1280),
# event-d: 1280 samples × 3 channels
(os.path.join(os.path.dirname(__file__), "fixtures", "decode-re-5-8-26",
"event-d", "M529LK2V.470"), "Tran", 1280),
(os.path.join(os.path.dirname(__file__), "fixtures", "decode-re-5-8-26",
"event-d", "M529LK2V.470"), "Vert", 1280),
(os.path.join(os.path.dirname(__file__), "fixtures", "decode-re-5-8-26",
"event-d", "M529LK2V.470"), "Long", 1280),
]
@@ -325,9 +347,16 @@ def _full_truth(path):
def _full_truth_channel(path, channel):
"""Load one channel's samples (in 16-count units) from the BW ASCII export."""
import re
import glob, re
col_idx = {"Tran": 0, "Vert": 1, "Long": 2, "MicL": 3}[channel]
with open(path + ".TXT", "r", encoding="utf-8", errors="replace") as f:
# event-a's TXT has a typo ("M59" vs "M529") — pick the .TXT in the same dir
# rather than assuming exact-name correspondence.
txt_path = path + ".TXT"
if not os.path.exists(txt_path):
candidates = glob.glob(os.path.join(os.path.dirname(path), "*.TXT"))
if candidates:
txt_path = candidates[0]
with open(txt_path, "r", encoding="utf-8", errors="replace") as f:
lines = f.read().splitlines()
header_idx = None
for i, line in enumerate(lines):