Multiplex communications – Duplex – Convertible to half duplex
Patent
1996-07-23
2000-02-29
Ton, Dang
Multiplex communications
Duplex
Convertible to half duplex
370279, 370526, H04M 1100
Patent
active
060318252
ABSTRACT:
A system for providing an IR-link between a mobile phone and its accessories to transmit audio, control, and data signals between them in an apparent full-duplex real time mode using a conventional half-duplex IR-transceiver with suitable FIFO registers and control means. The "direction" of the half-duplex channel is "switched" by the system which may be embodied in an IR-link module, having transmission channels for digital full-duplex audio signals, slow data messages and fast data messages, and for some control data. The module is connected to the baseband of a phone through a baseband interface (BBIF) and communicates through a media interface (MIF) and an infrared interface (IRIF) with free air space or a lightguide. A link-specific low-level protocol is used for audio and slow data message transmission but the link hardware of the module may also support other protocol implementations. The system may be implemented in hardware and/or software.
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Jarvensivu Seppo
Kaikuranta Terho
Lipponen Markku
Sulavuori Toni
Ho Tuan Q
Nokia Mobile Phones Limited
Ton Dang
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