Patent ID: 9191478
Filing Date: 2015-11-17
Classification: H04M,H04W

Abstract:
1. A digital wireless intercom system, comprising: at least one master base station; at least one remote base station connected to the at least one master base station wiredly through at least one of a local area network, a local area network infrastructure and an internet, the at least one remote base station transmitting and receiving a synchronization signal and a data signal of digital type with the at least one master base station; a plurality of first belt packs within a transmission radius of the at least one master base station, the plurality of first belt packs transmitting and receiving the synchronization signal and the data signal with the at least one master base station wirelessly; and a plurality of second belt packs within a transmission radius of the at least one remote base station, the plurality of second belt packs transmitting and receiving the synchronization signal and the data signal with the at least one remote base station wirelessly, wherein the at least one master base station and the at least one remote base station are driven with different independent frequencies based on a frequency interference situation, wherein a transmission frame of each of the at least one master base station and the at least one remote base station includes a transmission synchronization frame, a plurality of reception data frames and a plurality of transmission data frames constituting a period, and wherein a starting timing of the period of the transmission frame of the synchronization signal and the data signal transmitted and received between the at least one master base station is different from a starting timing of the period of the transmission frame of and the at least one remote base station have different starting timings of period.