Voice mail system on magnetic tape

The present invention is a magnetic tape-based "voice mail" multi-user message system. The system transmits audio prompts to callers to help guide them through the various procedures. The callers respond with Touch-Tone commands. A novel circuit is provided to detect these tone commands wi...

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Bibliographic Details
Main Authors KLARQUIST; THOMAS D, HOOD; WILLIAM G, NEPPLE; BRUCE C, PARK; LAWRENCE B, LEE; KAI-DICK, PARK; MICHAEL C, OLIN; DANIEL C
Format Patent
LanguageEnglish
Published 24.05.1988
Edition4
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
TELEPHONIC COMMUNICATION
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Summary:The present invention is a magnetic tape-based "voice mail" multi-user message system. The system transmits audio prompts to callers to help guide them through the various procedures. The callers respond with Touch-Tone commands. A novel circuit is provided to detect these tone commands without significant interference from the audio prompt signals. This circuit is highly insensitive to deviations in the impedance of the incoming telephone line from its expected value. A circuit is also provided to prevent Touch-Tone commands which are recorded on tape from being re-executed when they are played back from the tape. A single L.E.D. indicator on each recipient's telephone set indicates the status of the system: idle with new message waiting; idle without new message waiting; busy with new message waiting; or busy without new message waiting.
Bibliography:Application Number: US19860833888