| 摘要 |
HIGH SPEED DATA INTERFACE FOR LAND MOBILE COMMUNICATION SYSTEM A high speed data interface unit that is fully compatible with existing, trunked, land mobile voice transceivers is provided. Data rates of up to 4800 baud using bilevel modulation are achievable without the use of dedicated data transceivers, or the designation of a dedicated data channel. The data interface includes a microprocessor based modem having data pulse formation, data recovery, and pulse filtering circuits that optimize available channel bandwidth for communication of digital data. |
