Audio and video radio transmission system and transmission method

A wireless transmission, audio and video technology, applied in the direction of pulse modulation TV signal transmission, wireless communication, two-way working system, etc., can solve the problems of unusable communication network, low efficiency, poor effect, etc., and achieve scientific scheduling, support and self-protection The effect of safe, efficient and reliable transmission

Inactive Publication Date: 2009-08-05
SHENZHEN YUANFU INNOVATION ELECTRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the event of a fire, the original communication network (wired telephone, indoor coverage wireless system) cannot be used at all
The walkie-talkie system can only reach the communication distance of the first underground floor. On t

Method used

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  • Audio and video radio transmission system and transmission method
  • Audio and video radio transmission system and transmission method
  • Audio and video radio transmission system and transmission method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example one

[0027] Please refer to figure 1 As shown, the audio and video wireless transmission system of this example includes a wireless audio and video central station, a wireless audio and video intelligent relay station, and a wireless audio and video mobile terminal.

[0028] The wireless audio and video center station includes a semi-fixed and removable parabolic antenna, a pre-antenna amplifier, a feeder, a wireless audio and video transmission device, a monitoring computer, and two-way talkback equipment. Please refer to figure 2 As shown, the wireless audio and video transmission device: includes a WLAN transmission module, and its actual working frequency band can be 1.2GHz, 2.4GHz, 5.8GHz or 700-900MHz based on the improved version of WLAN; multi-carrier transmission module, its actual working frequency band can be 300~800MHz, similar to the current individual video communication terminal module. For ease of description, 340MHz is the typical representative ...

Example Embodiment

[0044] Example two

[0045] On the basis of the first embodiment, the wireless audio and video central station, the wireless audio and video intelligent relay station and the wireless audio and video mobile terminal are respectively embedded with software-implemented spread-spectrum remote transceiver sub-modules, which are used to transmit signals at the building entrance to far away It is used when driving a vehicle (such as the command vehicle cannot drive near the target building). The command vehicle from the second underground floor to the ground and 1500-4000 meters away from the exit (without obstruction) can receive high-quality images as described in the characteristics of the system. The intelligent relay station is also a wireless audio and video center station. end.

Example Embodiment

[0046] Example three

[0047] Please refer to Figure 5 As shown, the difference between this embodiment and the first embodiment is that the wireless audio and video intelligent relay station of this embodiment does not include a multi-carrier transmission module, so it only performs relay transmission for WLAN transmission and voice intercom transmission.

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Abstract

The invention discloses an audio-video wireless transmission system and a transmission method, wherein, the system comprises a wireless audio-video central station and a wireless audio-video mobile terminal; when the central station and the mobile terminal carry out audio-video wireless transmission by adopting a WLAN transmission channel, the wireless audio-video central station detects the quality of a signal transmitted from the wireless audio-video mobile terminal in real time; when the signal quality is reduced to an early warning value, the two adopt a multicarrier transmission channel, a central station image is synchronously switched to the multicarrier transmission channel; and the WLAN transmission channel keeps monitoring, when the signal quality of the WLAN transmission channel is increased to a preset value, an interface of the WLAN transmission channel is restored, and the multicarrier transmission channel is cut off. The invention organically combines the WLAN and multicarrier proposal together, realizes the full utilization under different source conditions, and reliably realizes the real-time transmission of audio-video and data under the complex environment.

Description

【Technical field】 [0001] The invention relates to a wireless signal transmission technology, in particular to a wireless audio and video transmission scheme. 【Background technique】 [0002] At present, with the development of cities and the density of buildings, the safety of high-rise buildings, underground garages and shopping malls has become a difficult problem for communication guarantees in fire protection and emergency response; in complex environments, such as multi-storey underground garages or urban villages, abnormal situations occur in handshake buildings How can the outside know the actual situation inside, which also puts forward the requirement of real-time video surveillance solution for communication guarantee. Especially when a fire breaks out in an underground shopping mall or garage, how to effectively communicate and dispatch firefighters has always been a difficult problem in the field of wireless communication. In case of fire, the original communicat...

Claims

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Application Information

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IPC IPC(8): H04N7/14H04N7/24H04W84/12H04L5/06
CPCH04N7/106H04L5/006
Inventor 刘化文
Owner SHENZHEN YUANFU INNOVATION ELECTRON
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