Implementation of Audio Process Technologies in the Service Linked with 110 Emergency Alerting Station

The research result of digital audio process technologies has already stepped out of the laboratory to the commercial market.The digital audio process is comprising of three parts, that is, digital description of audio signals, digital process technologies of audio signals, and practical application of audio signals process. The two ways for digital description of audio signal can be classified into wave description and parameter discription.The wave description mainly adopts sampling and quantum for the transformation of the audio signals to digital audio signals while the wave is the same.The parameter description views the audio signals as an output of some models under some inspiration.The inspiration source and model parameter are the description of audio signals.Obviously, these parameters are figured by the audio signals. Telephone digital recording requires a large storage capacity, thus it is unpractical for the storage of uncompressed telephone recording.The paper introduces the implementation of audio compression technology in Wuhan Power Supply Bureau's service linked with 110 emergency alerting station, which needs processing a large volume of telephone recording and compression.Therefore, audio compression technology is a key factor for this system. The system adopts the LPC10E and G723 algorithm to implement the voice compression process.For a real time effect, the system handles the voice compression while telephone recording;and playbacks the audio information after one-time audio decoding in order to implement continuous playback when transferred in the network via Modem.