Voice mail system on magnetic tape
作者： Bruce C. Nepple , Thomas D. Klarquist , Daniel C. Olin , Lawrence B. Park , William G. Hood
DOI:
关键词:
摘要: The present invention is a magnetic tape-based "voice mail" multi-user message system. system transmits audio prompts to callers help guide them through the various procedures. respond with Touch-Tone commands. A novel circuit provided detect these tone commands without significant interference from prompt signals. This highly insensitive deviations in impedance of incoming telephone line its expected value. also prevent which are recorded on tape being re-executed when they played back tape. single L.E.D. indicator each recipient's set indicates status system: idle new waiting; busy or waiting.
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