A Simplified Algorithm For MELP Vocoder And With Feasible Means To Assess

In recent years， with the rapid development of broadband communications technology，voice communications， wired communications， the bandwidth is almost not a problem， inmobile communications， satellite communications， wireless communications， we still needto reduce the speech coding rate to save bandwidth。Speech Coding Technology is a very important technology in the digital communication。With the development of communication technology and in order to transmit the same channelcapacity in the same channel and save storage space， Speech Coding Technology is widelyused in shortwave FM， terrestrial microwave and satellite communication。The speechcoding has an irreplaceable role，and in recent years，a variety of digital voice storage，voiceresponse applications such as voice can synthesize high-quality voice compression algorithmmade an urgent request。Speech Coding has three major directions: Low-rate Speech Coding， Variable-rateSpeech Coding and Non-compressed Voice Coding。 With the development of digitalcommunication services， high-quality low-rate Speech Coding Technology will become thehotspot of research，and it must have a wide application in the area of Secure Communication，Voice Mail， Network Communication， IP Telephone， especially in the battlefield ofinformation。 It can also be used for communication equipment in the field of Single-soldierBattle。MELP vocoder is the low rate speech coding an ideal coding scheme， the algorithm islinear predictive coding parameters of the traditional model of improvement， which combinesmulti-band mixed excitation， and the idea of a better simulation of the natural Languagefeatures， you can2。4kb/s the rate of synthesis of high quality voice。This thesis has three characteristics: First of all， after careful analysis， the integer pitchperiod， fractional pitch peiod and the final pitch period are very close to each other or evenidentical in most cases。...