John S. Collura

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Speech communication in Electronic Warfare (EW) environment should be resistant to interception, masquerade and tolerant to communication channel errors. In this paper, we described an algorithm which provides speech compression, strong encryption, error tolerance and speaker authentication features. This Robust Speech Coder (RSC) is backward compatible(More)
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(More)
Speech compression is one of the leading vicinity of digital signal processing that spotlight on dipping the bit rate of speech signals for transmission and storage devoid of considerable loss of quality. In past decades many speech coding techniques have been proposed for speech analysis. This paper attempts to assess and compare two compression techniques(More)
This paper describes the evaluation, test and selection of STANAG 4591, the future NATO Narrow Band Voice Coder (NBVC). STANAG 4591 will enable high performance interoperable secure speech communications in harsh acoustic and channel error environments at rates of 1.2kbps and 2.4kbps. The low data rate requirements of this voice coder allow it to operate on(More)