Answer detection method and apparatus for coin telephone sets

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4726057
SERIAL NO

06890194

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A coin operated telephone station is provided with apparatus for detectinghen a called party has answered a call (initiated at the coin operated telephone station) by the measurement of incoming signal energy on the telephone line. The apparatus includes hardware and software that cooperate in providing efficient and reliable detection of called party answer for the purpose of accurately charging telephone users. A microprocessor samples the output from each of three specialized energy detectors every 20 milliseconds to determine whether called party answer has occurred. The energy detectors include: (1) call progress tones in the frequency band 200-700 Hz approximately; (2) special information tones; and (3) broadband energy in the frequency band above 200 Hz. Additionlly, the time duration of the call progress tones and the quiet intervals between them are measured and used in the answer detection process. Signal energy from the calling party in the 200-700 Hz frequency band is filtered from the transmitting path by a 1200 Hz high-pass filter until called party answer occurs. Such filtering precludes a user from interfering with the detection process while permitting a limited amount of information to be tranmitted in the event that the answer detector is slow to operate.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
AMERICAN TELEPHONE AND TELEGRAPH COMPANYMURRAY HILL, NJ1082
AT&T Information Systems Inc.MURRAY HILL, NJ1

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Doerry, Armin W Noblesville, IN 21 97
Noonan, Dennis J Indianapolis, IN 1 21

Cited Art Landscape

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
* 4563681 Tone receiver for digital data communication systems 10 1983
 
TRANSWAVE, A PARTNERSHIP (1)
* 4484035 Dual tone multi frequency digital detector 11 1983
 
BELL TELEPHONE LABORATORIES, INCORPORATED (1)
* 4384175 Tone detection method and arrangement for observing and classifying repetitive status signals 5 1981
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
SECURUS TECHNOLOGIES, INC. (17)
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6665376 Selectively activated integrated real-time recording of telephone conversations with automated documentation of consent to call recording 62 1998
6611583 Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access 44 1998
6665380 Inmate messaging system and method 55 1999
6763099 Advanced three way call detection system and method using spread spectrum techniques 28 1999
6668045 Message screening, delivery and billing system 60 2000
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7248680 Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access 9 2003
7899167 Centralized call processing 41 2003
8000269 Call processing with voice over internet protocol transmission 11 2004
7916845 Unauthorized call activity detection and prevention systems and methods for a Voice over Internet Protocol environment 5 2006
* 2007/0242,658 Unauthorized call activity detection and prevention systems and methods for a voice over internet protocol environment 16 2006
7529357 Inmate management and call processing systems and methods 51 2007
8340260 Inmate management and call processing systems and methods 8 2009
9560193 Systems and methods for detecting a call anomaly using biometric identification 0 2015
 
SECURUS TECHNOLOGIES HOLDINGS, INC. (2)
7889847 Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access 39 2006
* 2007/0041,545 Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access 84 2006
 
AT&T Bell Laboratories (1)
* 5222122 Payphone having master and slave modes 15 1992
 
SUBSCRIBER SOLUTION, INC. (1)
6560323 Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access 63 1997
 
SCIENCE DYNAMICS CORPORATION (1)
7505406 Public telephone control with voice over internet protocol transmission 30 2001
 
SUBSCRIBER SOLUTIONS (1)
7106843 Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access 259 1998
* Cited By Examiner