A comparison of the new 2400 bps MELP Federal Standard with other standard coders
نویسنده
چکیده
In 1996, the U.S. Department of Defense Digital Voice Processing Consortium (DDVPC) selected Texas Instrument’s mixed excitation linear prediction (MELP) algorithm as the recommended new federal standard for 2400 bps voice communications. The algorithm selection process involved quality, intelligibility, communicability, and recognizability testing in many acoustic noise, error, and tandem conditions. Algorithm complexity was also measured. This paper compares the performance scores, diagnostic information, and complexity of MELP to the 4800 bps federal standard (FS1016) code excited linear prediction (CELP) algorithm, the 16 kbps continuously variable slope delta modulation (CVSD) algorithm, and the venerable federal standard (FIPS Pub. 137) 2400 bps linear predictive coding (LPC-10) algorithm.
منابع مشابه
Modified multiband excitation model at 2400 bps
This paper presents the Modi ed Multiband Excitation Model used for speech coding. In many MBE model coders, speech quality is degraded when incorrect voicing decisions are made, particularly for high-pitched female speakers. The MMBE addresses this issue with a modi ed voiced/unvoiced decision algorithm and a more robust pitch estimate. The listening quality of speech produced using the MMBE m...
متن کامل47.5 U.S. Federal Standard MELP Vocoder Tactical Performance Enhancement via MAP Error Correction
The United States government has developed a new Federal Standard 2400 bps vocoding algorithm called MELP Mixed Excitation Linear Prediction [1]. This vocoder has very acceptable voice quality under benign error-free channel conditions. However, when subjected to high error conditions as could be experienced in tactical vehicular operations, amelioration techniques may be employed which take ad...
متن کاملAn improved mixed excitation linear prediction (MELP) coder
This paper presents an improved Mixed Excitation Linear Prediction (MELP) coder. The MELP is the linearprediction-based speech coder that was recently chosen as the new 2400 bps U.S. Federal Standard. Even though the MELP is quite good, there are still some perceivable distortions, particularly around non-stationary speech segments and for some low-pitch male speakers. The key features of our n...
متن کاملA 1200 bps speech coder with LSF matrix quantization
A new 1200 bps speech coder designed with a tree searched multistage matrix quantization scheme is proposed. To improve speech quality and reduce the average bit rate, we have developed a new residual multistage matrix quantization method with the joint design technique. The new joint design algorithm reduces the codebook training complexity. Other new techniques for improving the performance i...
متن کاملSpeech Coding at very low rate
This work is an introduction to research in the field of speech coding. The goal is to become familiar with the latest technical analysis and speech coding to get the developing of two coders operating at very low speed, respectively (2400 and 1200 bps). The choice of the encoding algorithm has been focused on the MELP (Mixed Excitation Linear Prediction), which has a flow rate ratio / interest...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997