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| Number | Title | Issue Date |
| 6088428 | Voice controlled messaging system and processing method A voice controlled voice-messaging systems permits manipulation of voice messages over the telephone without the need for keypressed commands. Manipulation includes playback of messages, deletion of messages, saving messages, and sending a new message to ... | 07/11/2000 |
| 5805673 | Method and apparatus for reliable access to audio and facsimile message storage and retrieval system Reliable access to audio and facsimile message storage and retrieval systems is accomplished by employing a listening procedure to differentiate voice message clients from fax clients and, upon identifying a fax client, performing an extended listening pr... | 09/08/1998 |
| 5400394 | Adaptive echo canceller for voice messaging system An apparatus and method for echo cancellation in voice-messaging and voice-response systems, to enhance recognition of received DTMF and voice signals, comprising an efficient software echo canceller using adaptive digital filtering techniques. The voice ... | 03/21/1995 |
| 5267322 | Digital automatic gain control with lookahead, adaptive noise floor sensing, and decay boost initialization An automatic gain controller for a digitized audio signal, comprising a buffer with a plurality of subframes. Each subframe contains digitized data samples of the signal, the subframes including at least one future subframe and a current subframe. Signal ... | 11/30/1993 |
| 5163050 | Configurable parameter DTMF detector In a digital messaging system (10), an apparatus (37) and method for determining whether a DTMF (Dual Tone Multi Frequency) digit is present on an input signal (11,12). A heuristics engine (37) performs a series of tests on the input signal (11,12) using ... | 11/10/1992 |
