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Rattlegram

- SMS via audio!
1.13

Transmit short text messages over COFDMTV encoded audio signals

İsim Rattlegram
Sürüm 1.13
Güncelleme 08 Nis 2024
Boyut 5 MB
Kategori Haberleşme
Yükleme sayısı 10B+
Geliştirici aicodix GmbH
Android OS Android 5.0+
Google Play ID com.aicodix.rattlegram
Rattlegram · Ekran Görüntüleri

Rattlegram · Açıklama

COFDMTV is based on COFDM (coded orthogonal frequency-division multiplexing) technology:
- 160 ms long OFDM symbols
- 6.25 Hz per sub-carrier
- 1/8 guard interval
- differentially encoded PSK (phase-shift keying) modulation
- systematic polar codes for forward error correction

Currently Modes 14, 15 and 16 are supported:
Using either SPC(2048, 1392), SPC(2048, 1056) or SPC(2048, 712) with CRC32C aided SCL decoding and differential QPSK modulation for the payload.
Only a bandwidth of 1600 Hz is needed and the transmission of either 85, 128 or 170 bytes take about one second with the leading noise and fancy header disabled.

Rattlegram 1.13 · Ücretsi̇z İndi̇ri̇n

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