Time Station Emulator
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The Time Station Emulator is a project hosted on GitHub that allows users to synchronize most radio-controlled ("atomic") clocks and watches using almost any phone or tablet.
時間站模擬器
AI 生成摘要
時間站模擬器是一個託管在GitHub上的專案，它允許使用者利用幾乎任何手機或平板電腦來同步大多數無線電控制（"原子"）時鐘和手錶。
GitHub - kangtastic/timestation: Synchronize most radio-controlled ("atomic") clocks and watches using almost any phone or tablet
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Synchronize most radio-controlled ("atomic") clocks and watches using almost any phone or tablet
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kangtastic/timestation
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Time Station Emulator
Overview
Time Station Emulator turns almost any phone or tablet into a low-frequency
radio transmitter broadcasting a time signal that can synchronize most
radio-controlled (“atomic”) clocks and watches.
Real time signal broadcasts are limited in geographic range and notoriously
prone to interference in urban areas, so many such clocks end up never actually
using their self-setting functionality. Time Station Emulator may allow
setting such clocks when/where a suitable signal is not otherwise available.
Features
Requirements
The hard requirements of note are browser WebAssembly support and DAC support
for ≥44.1 KHz PCM. Almost any device running a browser from ≥2019 should
work.
However, as of early 2024, Safari on iOS and Firefox on Android have
multiple breaking issues and will not work.
For other devices, Time Station Emulator works best with a
built-in speaker of a phone or tablet. See
Technical Details for an explanation.
Usage
Time Station Emulator is hosted at https://timestation.pages.dev/.
Choose emulator settings.
The most important setting is which time station to emulate. Certain settings
are only available for certain stations.
Clocks (or watches) that support more than one station may prefer one of them
over the others.
Choose any clock settings and place the clock into sync mode.
If your clock has them, try to choose station and/or time zone settings that
make sense for your location.
Most clocks provide a way to force a synchronization attempt. You will
probably have to navigate menus and/or press physical buttons.
Position the speaker as close as possible to the clock’s antenna.
The transmission range is quite short, so positioning is crucial. Some
experimentation will probably be required, especially if you’re unsure where
the antenna is.
The volume should be set so that the clock picks up the cleanest signal.
Usually, this occurs at or near the maximum possible volume.
Start transmitting and hold the speaker in position.
If all goes well, the clock will set itself within three minutes.
Technical Details
Time Station Emulator generates an audio waveform intentionally crafted to
create, when played back through consumer-grade audio hardware, the right kind
of RF noise to be mistaken for a time station broadcast.
Specifically, given a fundamental carrier frequency used by a real time station,
it generates and modulates the highest odd-numbered subharmonic that also falls
below the Nyquist frequencies of common playback sample rates.
One of the higher-frequency harmonics inevitably created by any real-world DAC
during playback will then be the original fundamental, which should leak to the
environment as a short-range radio transmission via the ad-hoc antenna formed by
the physical wires and circuit traces in the audio output path.
License
src/shared/casefoldingmap.ts derives from a
data file
published by the Unicode Consortium, and is
Unicode licensed.
src/shared/icons.ts derives from SVG icons originally part of
ionicons v5.0.0 and
Flagpack, and is MIT licensed by way of those projects.
All other files are also MIT licensed.
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Synchronize most radio-controlled ("atomic") clocks and watches using almost any phone or tablet
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