Entering the 21st century, with the rapid development of digital technology and the ever-increasing demands for audio quality in conference systems, conference systems have fully entered the digital age, giving rise to all-digital conference systems. The core technology of an all-digital conference system is multi-channel digital audio transmission technology. It employs analog-to-digital conversion technology to directly convert the captured speaker's voice into a digital signal, then encodes the digital signal and transmits it over the cable. Based on the bandwidth of the transmission cable, appropriate multiplexing techniques are used to achieve simultaneous transmission of multiple audio signals on a single cable.
All-digital conference systems fundamentally solve problems existing in early conference systems, such as grounding interference, equipment noise, channel crosstalk, and long-distance transmission. The sound fidelity is extremely high, approaching CD quality. Simultaneously, a single twisted-pair or dual coaxial cable can transmit multiple original and translated audio signals, avoiding the use of complex multi-core cables, saving costs, simplifying construction and wiring, and enhancing system reliability. Furthermore, as a fully digital platform, a fully digital conference system can easily implement many value-added application functions, such as independent microphone output, allowing for independent recording or individual enhancement of each speaker's voice; internal communication functions (providing two-way communication between the chairperson, delegates, interpreters, and operators); and SMS functionality (system administrators can send SMS messages to all or specific conference units). The computer control and management software of a fully digital conference system is also very powerful, including multiple functional modules such as meeting room design, microphone management, voting management, meeting check-in, identity recognition, and personnel management.
In recent years, wireless conference discussion systems and wireless voting systems have emerged. Wireless systems greatly facilitate equipment installation for engineers and users (for example, without wired connections, certain system devices no longer need to be fixedly installed, allowing users to easily adjust system configurations according to the size of the meeting). The main disadvantages of wireless conference systems are relatively lower reliability and security. In addition, current wireless conference systems still need improvement in performance and cost.
