Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1991-05-02
1994-07-05
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379413, 379396, 379 89, 379252, H04M 164
Patent
active
053274938
ABSTRACT:
Device for detecting and identifying call progress tones on telephone lines. The application discloses a device for converting auditory call progress tones to visual indications and a novel circuit for identifying and distinguishing call progress tones based on their on-off cadence, if any, along with various alternative embodiments including: (1) a device which converts call progress tones to visual indications as for use by the deaf, (2) a device which is programmed to automatically go off-hook at certain times, detect a tone such as a stuttered dial tone indicating a message waiting, and activate a visual indicator, and (3) the use of a capacitor or rechargeable battery which is periodically refreshed by the device automatically going off-hook and which, while the device is on-hook, provides power required by the device.
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Maryann Chandler, Editor; "US WEST To Offer Message Waiting Indication--Visual"; US WEST ONA Newsletter Jan. 1991, pp. 2-6.
Aydelotte Richard
Blake Bennet
Richmond Martin
Richmond Robert L.
Active Voice, Inc.
Dwyer James L.
Hunter Daniel S.
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