| 摘要 |
A wireless network device for sending multimedia data by using ZigBee is provided to compress image and voice signals, in order to transmit images effectively even within bandwidths of ZigBee. A voice/image encoder(121) comprises an image encoder(102), a voice encoder(104), and a multiplexer(109). The image encoder compresses and encodes an image signal inputted from an image input device(101). The voice encoder compresses and encodes a voice signal inputted from a voice input device(103). The multiplexer synthesizes digital signals individually delivered from the encoders, and generates one bit stream(bit string) signal. A voice/image decoder(122) comprises a demultiplexer(110), an image decoder(106), and a voice decoder(108). The demultiplexer separates the image signal from the voice signal from the bit stream signal to extract the separated signals. The image decoder restores compression from the compressed image signal to generate an original image signal. The voice decoder restores compression, and generates an original voice signal. ZigBee RF transceivers(113,114) wirelessly transceive data by using IEEE802.15.4 ZigBee.
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