David A. Heide

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Throughout the history of telecommunication, speech has rarely been transmitted with its full analog bandwidth (0 to 8 kHz or more) due to limitations in channel bandwidth. This impaired legacy continues with tactical voice communication. The passband of a voice terminal is typically 0 to 4 kHz. Hence, high-frequency speech components (4 to 8 kHz) are(More)
In this paper a novel technique for implementing heavily bit error protected 8 and 12 kilobits per second (kbps) voice coder (vocoder) based on a 2.4 kbps vocoder specified in Tactical Secure Voice Cryptographic Interoperability Specification (TSVCIS) is compared to the current 16 kbps Continuously Variable Slope Delta Modulation (CVSD) used in several(More)
Approved for public release; distribution is unlimited. 6h2 The following notice applies to any unclassified (including originally classified and now declassified) technical reports released to "qualified U.S. contractors" under the provisions of DOD Directive 5230.25, Withholding of Unclassified Technical Data From Public Disclosure. 1. Export of(More)
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