Universal TTY/TDD devices for robust text and data transmission via PSTN and cellular phone networks
作者： Karl Hellwig , Matthias Dörbecker
DOI:
关键词:
摘要: A new modem standard provides reliable in-band transmission of TTY/TDD signals via the speech channel all digital cellular phone systems. The includes error correction such as Forward Error Correction (FEC), and also performs interleaving to spread each character over several adjacent frames. can be applied coding standards mobile implemented using a special interface cable or box between conventional device phone. integrated directly into phones, necessary signal processing performed by mobile's DSP. Universal provided that supports both standards: Baudot code well signals, specialized hardware, hardware laptop computer with software.
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