icad-tone-detection 2.8.2

A Python library for extracting scanner radio tones from scanner audio.

icad_tone_detection

Detect Two-Tone (Quick Call), Pulsed Single-Tone (On/Off Beeps), Long Tones, Hi–Low warble tones, MDC1200 / FleetSync, and DTMF in scanner-audio recordings.
The heavy DSP is performed by a bundled native binary (icad_decode), while the Python wrapper handles audio I/O and STFT-based frequency extraction.

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Features

• Single function: tone_detect() or CLI tool icad-tone-detect
• Tone types:
  • Pulsed single-tone
  • Two-Tone / Quick Call
  • Long tones
  • Hi–Low warble tones
  • MDC1200 / FleetSync
  • DTMF
• Flexible inputs: File path, URL, bytes, BytesIO, or pydub.AudioSegment
• Automatic resample to 16 kHz mono PCM via FFmpeg
• Fully configurable: All thresholds & detection params exposed as keyword args or CLI flags
• Binaries included for:
  • Linux (x86_64, arm64, armv7)
  • macOS (x86_64, arm64)
  • Windows (x86_64)

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Installation

pip install icad_tone_detection

Requires: Python 3.9+ and ffmpeg in PATH.

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Quick start — Python

from icad_tone_detection import tone_detect

result = tone_detect("my_scanner_recording.wav")
print(result.pulsed_result)
print(result.two_tone_result)

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Quick start — CLI

# Show help
icad-tone-detect --help

# Analyze a file with MDC disabled
icad-tone-detect my.wav --detect_mdc false --debug

Boolean flags accepted: true/false, yes/no, or 1/0.

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Full CLI example

icad-tone-detect my_scanner_recording.wav \
--detect_pulsed true \
--pulsed_center_hz 1010 --pulsed_bw_hz 25 \
--pulsed_min_cycles 6 \
--pulsed_min_on_ms 120  --pulsed_max_on_ms 900 \
--pulsed_min_off_ms 25  --pulsed_max_off_ms 350 \
--detect_two_tone true \
--tone_a_min_length 0.85 --tone_b_min_length 2.6 \
--detect_hi_low true --hi_low_interval 0.2 --hi_low_min_alternations 6 \
--detect_long true --long_tone_min_length 3.8 \
--detect_mdc false --detect_dtmf true \
--time_resolution_ms 50 --matching_threshold 2.5 \
--debug

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Example output (debug mode)

############################################################
ICAD Tone Detection: DEBUG - v2.8.0
------------------------------------------------------------
Decode binary path:        /…/bin/linux_arm64/icad_decode
Analyzing audio at:        my_scanner_recording.wav
Matching Threshold:        2.5%
Time Resolution (ms):      50
… (trimmed) …
------------------------------------------------------------
DETECTION SUMMARY
------------------------------------------------------------
Two-Tone (Quick Call): 1
Long Tones:            0
Hi-Low Warble:         0
Pulsed Single Tone:    3
MDC1200/FleetSync:     0   (disabled)
DTMF:                  2
------------------------------------------------------------
{
"pulsed": [
{
"tone_id": "pl_1",
"detected": 1010.1,
"start": 2.31, "end": 5.12, "length": 2.81,
"cycles": 8,
"on_ms_median": 180, "off_ms_median": 95
}
],
"two_tone": [
{
"tone_id": "qc_1",
"detected": [473.2, 810.0],
"tone_a_length": 0.90, "tone_b_length": 2.84,
"start": 6.23, "end": 9.07
}
],
"long_tone": [],
"hi_low": [],
"mdc": [],
"dtmf": [
{ "digit": "5", "start": 12.01, "end": 12.08 },
{ "digit": "9", "start": 12.35, "end": 12.42 }
]
}

---

Python API — tone_detect() signature

result = tone_detect(
audio_path="my.wav",          # path / URL / BytesIO / AudioSegment

    # STFT & grouping
    matching_threshold=2.5,       # % tolerance for grouping freqs
    time_resolution_ms=50,        # STFT hop size in ms

    # Quick Call (two-tone)
    tone_a_min_length=0.85,       # sec – min A-tone
    tone_b_min_length=2.6,        # sec – min B-tone

    # Hi/Low warble
    hi_low_interval=0.2,          # sec – max gap between hi/low groups
    hi_low_min_alternations=6,    # min alternations

    # Long tone
    long_tone_min_length=3.8,     # sec – min duration

    # Pulsed single-tone (~1 kHz)
    pulsed_center_hz=None,        # Hz – None=auto estimate (200–3000 Hz)
    pulsed_bw_hz=25.0,            # Hz ± deviation counted as ON
    pulsed_min_cycles=6,          # min ON→OFF cycles
    pulsed_min_on_ms=120,         # ms – ON min
    pulsed_max_on_ms=900,         # ms – ON max
    pulsed_min_off_ms=25,         # ms – OFF min
    pulsed_max_off_ms=350,        # ms – OFF max

    # Detector toggles
    detect_pulsed=True,
    detect_two_tone=True,
    detect_long=True,
    detect_hi_low=True,

    # External decoders
    detect_mdc=True,              # MDC1200 / FleetSync
    mdc_high_pass=200,            # Hz
    mdc_low_pass=4000,            # Hz
    detect_dtmf=True,

    debug=False
)

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Result object

tone_detect() returns a ToneDetectionResult dataclass with:

• pulsed_result — Pulsed single-tone hits: tone_id, detected, start, end, length, cycles, on_ms_median, off_ms_median
• two_tone_result — Quick-Call matches: tone_id, detected [A,B], tone_a_length, tone_b_length, start, end
• long_result — Long tone hits: tone_id, detected, length, start, end
• hi_low_result — Warble sequences: tone_id, detected [low,high], alternations, length, start, end
• mdc_result — Decoded frames from external MDC/FleetSync decoder (if enabled)
• dtmf_result — Decoded DTMF presses (if enabled)

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Platforms & binaries

OS	Architectures	Wheel folder name
Linux	x86_64, arm64, armv7	linux_x86_64, linux_arm64, linux_armv7
macOS	x86_64, arm64	macos_x86_64, macos_arm64
Windows	x86_64	windows_x86_64

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Example audio

Sample WAV files are in examples/example_audio/.

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Contributing

Issues and pull requests welcome: GitHub repo

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License

MIT © TheGreatCodeholio • Version 2.8.2 • Python 3.9+