The other circuits of the Kiel patent are audio sensor circuits of some type, narrow band or broad band, which are used in conjunction with some type of timing circuit, either an explicit timer or an implicit integration-over-time-circuit. A motion detecting sensor and its supporting circuits would typically add a high degree of expense to a handset and the sensor itself would have to be rugged because handsets are often dropped. This apparatus requires an off-hook sensing circuit and a howler tone sensing system, a silence sensing system including some type of timer circuit, a dial tone sensing system and some type of timer circuit, or a motion sensing system and a timer. The occurrence of any of these is considered an inadvertent off-hook state and the apparatus automatically hangs up, i.e., goes to an on-hook condition. The Kiel apparatus monitors for: a characteristic howler tone sent by a local telecommunication switch to warn the telephone customer that his or her telephone is off-hook, a long period of silence where there is no dial tone or similar telephone signal indicative of an active telephone call, or no movement of a handset for a time, which is determined by a motion sensor in such a device. 4,922,529 issued to Kiel discloses an automatic hang-up apparatus for restoring service to off-hook telephones. Loud voices could be erroneously interpreted by this arrangement as an active telephone conversation and thus not an inadvertent off-hook condition of a telephone set. Further, it would not be effective if a high audio level of human speech activity was occurring near the microphone whether a telephone conversation was taking place or not. This arrangement requires a speech detector and at least one timer. If the user does not speak into microphone for a long period of time, then the arrangement of this patent automatically returns the telephone set to an on-hook condition. discloses an automatic on-hook arrangement which monitors the output of the microphone of the telephone to determine if a user is speaking into the microphone. This problem is compounded if there are multiple extensions to one line because none of the extensions may be used until the one extension that was left in the off-hook condition is returned to the on-hook condition.Ī telephone that is left off-hook is also a problem to its local telecommunication switch because after a few minutes the switch stops polling for the first character or number and shifts instead to a special program that performs a different, slower polling for sensing a return of the telephone to an on-hook state. Whenever a standard telephone is left off-hook, normal telephone calls cannot be originated or received until the telephone which was inadvertently left off-hook is returned to an on-hook condition. A third example occurs when a handset is knocked off its hook-switch and left by a household member or a household pet. Another common example occurs when a user does not place the handset squarely in the on-hook position causing the user's telephone to remain in the off-hook condition. For example, a user while conversing at one extension telephone in one room often leaves that extension off-hook to get something in a second room and then continues the conversation on another extension telephone in the second room and after the extension telephone in the second room is returned to the on-hook condition at the end of the conversation the extension in the first room is frequently inadvertently left off-hook. This often occurs for many different reasons. Standard telephone sets all have the problem that they may inadvertently be left off-hook. Kit, pair mount brackets with hardware.The present invention relates to telephone equipment and more particularly to telephone equipment which automatically returns to an on-hook condition even if its handset is physically off-hook. Kit, pair of mount brackets with hardware for Dodge Charger police package vehicles, 2015-2022 Single Rumbler Woofer for use with Pathfinder® sirenĭual Rumbler Woofer for use with Pathfinder siren Used with PF200 to utilize dual-tone and Rumbler capabilities Siren Amp, Rumbler, secondary warning system, 12 VDC, low frequency tones, hardware kit, housing bands and cradles.
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