Underwater multi-user voice communication method and device capable of distributing frequency spectrum dynamically

Abstract

The invention discloses a underwater multi-user voice communication method and a device capable of distributing frequency spectrum dynamically. The method is characterized in that: each user can dynamically transfer activity voice data preferentially by using currently available spectrum resources, and, when load is heavy, provides extra spectrum resources for activity voices by reducing transmission of mute data. The device comprises an underwater multi-channel transmitter module, a multi-channel modulation module, a rate and time delay regulating module, a voice encoding module and a voice collecting module which are connected sequentially, and further comprises a voice playing module, a voice decoding module, a de-bouncing module, a multi-channel demodulation module and an underwater multi-channel receiving module which are connected sequentially. The underwater multi-user voice communication method and device capable of distributing frequency spectrum dynamically disclosed by the invention can increase spectrum utilization efficiency of an underwater multi-user voice communication system, increase number of call users supported by the system, and transfer voice information effectively, and can be widely applied to the fields, such as, frogman diving, submarine communication, saturated diving, sea military training, ocean scientific research, underwater operation, underwater sightseeing tour, marine resources exploration, etc..

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to an underwater multi-user voice communication method and device for dynamically allocating spectrum. Background technique [0002] Underwater voice communication is an important subject in underwater acoustic communication. has a wide range of uses. With the increase of human activities underwater, the demand for underwater voice communication technology has shifted from traditional point-to-point voice communication to multi-user and networked voice communication. Since the underwater acoustic channel is a channel with extremely complex time-space-frequency changes, limited frequency band, long delay, Doppler frequency shift, strong multi-path interference and high noise, it is one of the most difficult wireless communication channels in nature. , making the establishment of an underwater multi-user voice communication system a very challenging task, not only ne...

AI Technical Summary

Problems solved by technology

Since in the way of fixed spectrum allocation, each channel is exclusively occupied by different users, and other users are not allowed to access even if a certain user is not communicating, so it has great limitations in underwater multi-user voice communication. Mainly: (1) Due to the narrow available frequency band in the underwater acoustic channel and the lack of spectrum resources, the capacity of the underwater multi-user voice communication system using fixed spectrum allocation is small, and the number of users who can support voice communication at the same time is small. It is difficult to meet the needs of human underwater activities in the future; (2) In human conversations, silent segments without speech usually occupy a large proportion. In speech coding technology, these silent segments can be detected, and The fixed code rate for encoding and transmission, the way of fixed spectrum allocation can not make use of these spare spectrum resources, which reduces the efficiency of spectrum utilization; (3) Compared with the active speech segment, the silent segment is much less important to hearing, and packet loss Restoring it through interpolation and other methods has little effect on speech intelligibility. Therefore, when the system load is heavy, some silent frame data can be discarded to free up spectrum resources for active voice segment data, while fixed allocation of spectrum The method cannot take advantage of this characteristic of hearing

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