Systems and methods for generating key press status messages wit

Details Systems and methods for generating key press status messages wit Systems and methods for generating key press status messages wit

1997-07-21

1999-12-21

Horabik, Michael

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 20, 379368, 455550, 375247, H03K 1794

Patent

active

060054999

ABSTRACT:
Systems and method for monitoring and generating key pad status messages in a telecommunications network. A resistor ladder network is provided to generate distinct DC-level analog voltage signals in response to the pressing of any one of a plurality to keys of a key pad. A combiner circuit is employed to combine the DC-level analog voltage signals with an analog voice signal received from an audio transducer to form a composite analog signal, and a coder/decoder circuit is provided to convert the composite analog signal into a composite digital signal. A digital signal processing circuit executes a subtractive sample delta filtering algorithm to determine whether data indicative of a key press is included within the composite digital signal, and generates status messages indicative of a key press upon determining that a key has been pressed.

REFERENCES:
patent: 4467140 (1984-08-01), Fathauer et al.
patent: 4583189 (1986-04-01), Koyama
patent: 5220601 (1993-06-01), Gulick et al.
patent: 5235635 (1993-08-01), Gulick
patent: 5619196 (1997-04-01), Escobosa
patent: 5798716 (1998-08-01), Davis
patent: 5848353 (1998-12-01), Matsumoto

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