Multisensing circuitry for class signals and stutter dial tone i

Details Multisensing circuitry for class signals and stutter dial tone i Multisensing circuitry for class signals and stutter dial tone i

1996-07-24

1998-10-20

Tsang, Fan S.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 67, 379 88, 379 89, 379201, 379215, 379372, 379373, 379376, 379381, 375334, 375340, H04M 164

Patent

active

058258523

ABSTRACT:
A VMWI (Visual Message Waiting Indicator) multisense detection device solves both the problem of long CLASS VMWI signal retransmission delays and unreliable CLASS VMWI signal transmission by simultaneously enabling both stutter dial tone detection and CLASS VMWI signal detection. The multisense device samples the line each time the phone is placed on-hook or after the phone goes unanswered after a ring. If a valid CLASS VMWI signal is detected before the scheduled dial tone test, the dial tone test will be canceled. If no CLASS VMWI signal is detected, after a given amount of time, the VMWI device automatically enables stutter dial tone detection. The detection circuitry periodically polls for a preamble field of the CLASS signal to determine whether a valid CLASS signal is about to be transmitted. If the preamble indicates a CLASS signal is being transmitted, the detection circuitry remains on and the CLASS signal is received and processed. If no signal is detected during the time period for the preamble, the detection circuitry is shut off until the next polling period. This polling technique allows the VMWI detection device to operate only on batteries for long periods of time.

REFERENCES:
patent: 4086441 (1978-04-01), Ullakko et al.
patent: 4582957 (1986-04-01), Hayes et al.
patent: 5327493 (1994-07-01), Richmond et al.
patent: 5394109 (1995-02-01), Simard
patent: 5400365 (1995-03-01), Tulai
patent: 5436590 (1995-07-01), Simard et al.
patent: 5483577 (1996-01-01), Gulick
patent: 5521964 (1996-05-01), Schull et al.

Affiliated with

Also associated with

Rating

Multisensing circuitry for class signals and stutter dial tone i does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multisensing circuitry for class signals and stutter dial tone i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multisensing circuitry for class signals and stutter dial tone i will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-253743