Detecting whether a telephone line has been disconnected
First Claim
1. Apparatus for detecting whether a telephone call has been disconnected, which apparatus comprises:
- click detector means for detecting a click and for generating a click indication indicating whether or not a click was detected;
handset impact detector means for detecting a telephone handset impact and for generating a handset impact indication indicating whether or not a handset impact was detected;
silence detector means for detecting silence and for generating a silent indication indicating whether or not silence was detected;
means for determining a predetermined time interval and for transmitting a signal to a controller means whenever the time period expires;
wherein the controller means comprises analysis means, responsive to the signal and to click indications, handset impact indications, and silence indications, for, determining whether a predetermined sequence of handset impact, clicks, and silence was detected and, if so, for generating a signal indicating that the telephone call has been disconnected.
7 Assignments
0 Petitions
Accused Products
Abstract
Apparatus for detecting whether a telephone call has been disconnected, which apparatus includes: (a) a click detector for detecting a click and for generating a "click indication"; (b) a telephone handset impact detector for detecting a telephone handset impact and for generating a "handset impact indication"; (c) a silence detector for detecting silence and for storing a "silent indication"; (d) a timer for determining a predetermined time interval and for transmitting a signal to a controller whenever the time period expires; wherein, in response to the signal, the controller analyzes the "click indication", the handset impact indication", and the "silent indication" to determine whether a predetermined sequence of handset impact, clicks, and silence was detected and, if so, for generating a signal indicating that the telephone call has been disconnected.
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Citations
8 Claims
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1. Apparatus for detecting whether a telephone call has been disconnected, which apparatus comprises:
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click detector means for detecting a click and for generating a click indication indicating whether or not a click was detected; handset impact detector means for detecting a telephone handset impact and for generating a handset impact indication indicating whether or not a handset impact was detected; silence detector means for detecting silence and for generating a silent indication indicating whether or not silence was detected; means for determining a predetermined time interval and for transmitting a signal to a controller means whenever the time period expires; wherein the controller means comprises analysis means, responsive to the signal and to click indications, handset impact indications, and silence indications, for, determining whether a predetermined sequence of handset impact, clicks, and silence was detected and, if so, for generating a signal indicating that the telephone call has been disconnected. - View Dependent Claims (2, 3)
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4. Apparatus for detecting whether a telephone call has been disconnected, which apparatus comprises:
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click detector means for detecting a click and for generating a click indication indicating whether or not a click was detected; handset impact detector means for detecting a telephone handset impact and for generating a handset impact indication indicating whether or not a handset impact was detected; silence detector means for detecting silence and for generating a silent indication indicating whether or not silence was detected; means for determining a predetermined time interval and for transmitting a signal to a controller means whenever the time period expires; energy detector means for obtaining a measure of the energy of the signal during the predetermined time interval; wherein the controller means comprises analysis means, responsive to the signal and to click indications, handset impact indications, silence indications, and measures of energy, for determining whether a predetermined sequence of handset impact, clicks, and silence was detected and whether a ratio of a measure of energy obtained prior to the predetermined sequence and a measure of energy obtained during the last silence of the predetermined sequence is below a predetermined constant and, if so, for generating a signal indicating that the telephone call has been disconnected.
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5. Apparatus for detecting whether a telephone call has been disconnected, which apparatus comprises:
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handset impact detector means for detecting a telephone handset impact and for generating a handset impact indication indicating whether or not a handset impact was detected; silence detector means for detecting silence and for generating a silent indication indicating whether or not silence was detected; means for determining a predetermined time interval and for transmitting a signal to a controller means whenever the time period expires; wherein the controller means comprises analysis means, responsive to the signal and to handset impact indications and silence indications, for determining whether a predetermined sequence of handset impact and silence was detected and, if so, for generating a signal indicating that the telephone call has been disconnected.
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6. Apparatus for detecting whether a telephone call has been disconnected, which apparatus comprises:
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means for detecting a telephone handset impact and for generating a handset impact indication; and
;means, in response to the handset impact indication, for generating a signal indicating that the telephone call has been disconnected.
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7. Method for detecting whether a telephone call has been disconnected, which method comprises the steps of:
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detecting a click and generating a click indication; detecting a telephone handset impact and generating a handset impact indication; detecting silence and generating a silent indication; determining the expiration of a predetermined time interval; and in response to the expiration and click indications, handset impact indications; and
silent indications, determining whether a predetermined sequence of handset impact, clicks, and silence was detected and, if so, generating a signal indicating that the telephone call has been disconnected.
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8. Method for detecting whether a telephone call has been disconnected, which method comprises the steps of:
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detecting a telephone handset impact and generating a handset impact indication; detecting silence and generating a silent indication; in response to handset impact indications and silent indications, determining whether a predetermined sequence of handset impact and silence was detected and, if so, generating a signal indicating that the telephone call has been disconnected.
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Specification