Wireless sensor network access control method for voice collecting and transmitting and system thereof

A wireless sensor and voice collection technology, applied in access restriction, network topology, wireless communication, etc., can solve the problems of high computational complexity, unsuitable for low cost, and high loss rate of wireless sensor network, etc.

Inactive Publication Date: 2009-07-08
INST OF SOFTWARE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, since E-Model is aimed at VoIP applications, it does not consider the characteristics of high loss rate of wireless sensor networks
In addition, the compress

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  • Wireless sensor network access control method for voice collecting and transmitting and system thereof
  • Wireless sensor network access control method for voice collecting and transmitting and system thereof
  • Wireless sensor network access control method for voice collecting and transmitting and system thereof

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Embodiment Construction

[0061] The present invention will be described in detail through the preferred embodiments below in conjunction with the accompanying drawings, but it does not constitute a limitation to the present invention.

[0062] In this embodiment, the system hardware platform of the present invention is a low-cost voice collection node. The node supports high-bandwidth voice transmission and uses a 32-bit microcontroller. The maximum data sending and receiving rate of the wireless transceiver chip is 500Kbps. An electret condenser microphone is installed on the node for voice data collection. Since the human voice frequency ranges from 340Hz to 3400Hz, the voice sampling frequency is set to 8KHz to ensure lossless voice collection. In addition, a 340Hz to 3400Hz band-pass filter is implemented on the platform to further reduce the noise brought by other frequency bands such as the human voice frequency and optimize the sampling effect. In order to reduce the transmission voice bandwi...

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Abstract

The invention discloses a wireless sensor network access control method and the system thereof for speech acquisition and transmission and belongs to the field of wireless sensor network. The method of the invention comprises the following procedures: a node captures a terminal-to-terminal path packet loss rate from the node to a convergent node, and compression ratio and redundancy rate are calculated according to the packet loss rate; a node i is required to calculate the rate of injection according to the compression ratio and the redundancy rate and sends out a participation request message containing the rate of injection to the convergent node simultaneously; the convergent node judges whether the current flow satisfies the bandwidth constraint according to the participation request message; if the current flow satisfies the bandwidth constraint and no message of objecting the node i to participate sent by other nodes is received, then the node i is allowed to participate; if objects, the node i is not allowed to participate. The system of the invention also comprises a microcontroller, a wireless transmit-receive module and a speech acquisition device. Compared with the present technique, the invention has the advantages of ensuring the terminal-to-terminal speech quality, raising network utilization rate and providing on-line and in-real evaluation of sensor network speech transmission.

Description

technical field [0001] The invention relates to an admission control method and system for voice collection and transmission, in particular to a wireless sensor network admission control method and system for voice collection and transmission, belonging to the field of wireless sensor networks. Background technique [0002] In recent years, with the development of embedded hardware technology and perception technology, deploying low-cost microphones on embedded nodes can enable nodes to collect low frame rate video or sound signals, and use limited computing equipment to process raw data in extremely Transmission over limited bandwidth. In a variety of applications, such as voice environment monitoring, intrusion detection, etc. have a wide range of applications. [0003] The high packet loss rate, high delay and delay jitter of the wireless network seriously affect the voice quality. In addition, voice has the characteristics of high data volume, which is easy to cause da...

Claims

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Application Information

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IPC IPC(8): H04W24/06H04W28/06H04W28/10H04W48/08H04W84/18
Inventor 孙利民李立群皇甫伟刘燕
Owner INST OF SOFTWARE - CHINESE ACAD OF SCI
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