Rattlegram

22 downloads

Uploaded by

Silent Miqo

Version

1.13 (build 14)  2 version(s)

Rattlegram versions

1.13 (build 14)

22 downloads

1.12 (build 13)

12 downloads

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Size

5.3 MiB

Publish Date

2024-04-28

Category

Tools

Package

com.aicodix.rattlegram

Minimum OS

Android 5.0

SHA1

5c8c86bf87aa29b4dc67af60c49c6714dd54c908

Description

Rattlegram lets you transmit short text messages over COFDMTV encoded audio signals. 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.