| 摘要 |
<p>An array of electromagnetic implements which, singly or in combination, enable audio, analog or digital communications over short or long distances using low power and a narrow (audio) bandwidth of 3KHz or less, preferably 1KHz or less. These electromagnetic implements maintain or restore emergency communications during terrorist and related disasters when commercial power is unavailable and traditional communications infrastructures and systems have failed. Conveyance of data is accomplished by computer generated voice transmission or by variously engineered tone transmissions, with or without quadrature amplitude modulation, forward error correction, and/or vocabulary encoding, among other features. Receipt of the data may be controlled by automated prioritization and transcription as well as manual or automated display on a computer screen.</p> |
