Importance

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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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First Claim