Comparison of TSVCIS voice at 8000 and 12000 bps VERSUS CVSD at 16000 bps

Shahan, Patrick; Heide, David A.; Cohen, Aaron E.

doi:10.1109/milcom.2012.6415564

Cited by 12 publications

(5 citation statements)

References 5 publications

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“…In other words, in the presence of no bit errors, the vocoding performance is exactly the same as the 2400 bps MELPe option. But when there are significant amounts of bit errors, performance is improved significantly by this error correction [6].…”

Section: And 12000 Bps Fixed Rate Modes Based On 2400 Bps Melpe mentioning

confidence: 99%

Universal Vocoder Using Variable Data Rate Vocoding

Heide¹,

Cohen²,

Lee³

et al. 2013

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To help achieve universal secure communications interoperability in the Department of Defense (DoD), one intermediate goal has been the development of a universal voice encoder (vocoder) that can seamlessly encode speech at a wide range of variable and fixed data rates to suit a wide range of DoD communication equipment. This report describes the most recent advancements in achieving this goal. Four of the most important areas of improvements presented are: (1) Significant improvements were made to the variable data rate (VDR) vocoder that make it much more robust in less than ideal environments. (2) Error control coding is now extended to all VDR modes. (3) Fixed rate vocoding modes based directly on the VDR encoding method were designed so that transcoding between these options can be done directly and with very little degradation in voice quality. (4) Heavily error protected, fixed rate modes were designed. These modes can be used as fail-safe modes to ensure communicability when channels deteriorate to previously unusable levels.

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Section: And 12000 Bps Fixed Rate Modes Based On 2400 Bps Melpe mentioning

confidence: 99%

Universal Vocoder Using Variable Data Rate Vocoding

Heide¹,

Cohen²,

Lee³

et al. 2013

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“…Compared with the continuously variable slope delta (CVSD) vocoder found in much legacy communication equipment, these protected modes show significant improvements in high bit error environments. [4] …”

Section: And 12000 Bps Fixed Rate Modes Based On 2400 Bps Melpe Opmentioning

confidence: 99%

“…This variable data rate (VDR) vocoder can be used in a wide variety of secure communication equipment depending on channel capabilities and congestion. Recently, we have also published papers [3] [4] describing work on fixed rate vocoders that are being specified in the Tactical Secure Voice Cryptographic Interoperability Specification (TSVCIS) [5] for future narrowband and wideband secure voice terminals being deployed in the DoD. The goal of this paper is to show how this work in both variable and fixed rate vocoding can be combined into a truly universal vocoder that can be used throughout the DoD in all types of platforms and communication equipment with direct interoperability between devices.…”

Section: Introductionmentioning

confidence: 99%

Variable Data Rate Vocoder Improvements for Secure Interoperable DoD Voice Communication

Heide

Cohen

Lee

et al. 2013

MILCOM 2013 - 2013 IEEE Military Communications Conference

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One intermediate goal towards achieving universal secure voice interoperability in the Department of Defense (DoD) has been the development of a universal voice encoder (vocoder). This vocoder would seamlessly encode speech at a wide range of interoperable variable and fixed data rates to suit a wide range of DoD communication equipment. This paper describes the most important features of such a vocoder and recent advancements in achieving this goal. Specifically this paper will describe three main areas: 1) Summary of the variable data rate (VDR) algorithm and the most recent improvements to the vocoder. 2) Methods for transcoding between fixed rate and variable data rate vocoding modes. 3) Summary of heavily bit error protected, fixed-rate modes.

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“…Recently, some effective ways [2] were suggested to realize lithium electrode working in aqueous electrolyte. It has been reported that such lithium electrode discharged stably in aqueous electrolyte for long time [3]. And it was expected that aqueous rechargeable lithium/air battery could also perform well based on this technology.…”

Section: Introductionmentioning

confidence: 99%