Apparatus and method for incoming call detection and alarm circuitry for cellular telephones
First Claim
1. An apparatus, monitoring the electrical power demands made by operation of a cellular telephone on a source of electrical power, for indicating an incoming telephone call to a user, comprising:
- monitoring means operatively coupled to the source of electrical power for providing an electrical state signal representative of the electrical current being drawn by operation of the cellular telephone;
means, operatively coupled to said monitoring means to receive said electrical state signal, for generating a voltage state signal having a value representative of the electrical current being drawn by the operation of the cellular telephone from the source of electrical power;
status determination means for receiving and monitoring said voltage state signal and for generating a powered up state signal whenever the value of said voltage state signal increases from a first selected lower value to a first selected higher value for a first preselected period of time;
incoming call detection means for receiving said powered up state signal and monitoring said voltage state signal, and for generating an alarm start signal whenever said powered up state signal is present and said voltage state signal is representative of a first selected current transient in the current being drawn by the cellular telephone for a second preselected period of time;
alarm means operative upon receipt of said alarm start signal for indicating an incoming call to a user;
alarm cutoff means for monitoring said voltage state signal and disabling said alarm means from further operation whenever the value of said voltage state signal is representative of a second selected current transient in the current being drawn by the cellular telephone; and
,cutoff means for monitoring said voltage state signal and disabling said status determination means from further operation whenever the value of said voltage state signal drops below a preselected cutoff value.
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Accused Products
Abstract
An apparatus for use with cellular telephone to indicate an incoming telephone call to a user includes a cellular telephone battery pack having a circuit that generates a voltage signal with a value representative of the current being drawn from the battery by the operation of the cellular telephone. A status determination circuit monitors the voltage signal and generates a powered up state signal whenever the value of the voltage signal increases from a first selected lower value to a first selected higher value for a first preselected period of time. An incoming call detection circuit whenever the powered up state signal is present and either the voltage signal is representative of a selected periodic current transient in the current being drawn by the cellular telephone for a second preselected period of time. An alarm is operative upon receipt of the alarm start signal for indicating an incoming call to a user. Also a cutoff circuit monitors the voltage of the battery and disables the apparatus further operation whenever the battery voltage drops below a preselected cutoff value to avoid damage to the battery.
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Citations
25 Claims
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1. An apparatus, monitoring the electrical power demands made by operation of a cellular telephone on a source of electrical power, for indicating an incoming telephone call to a user, comprising:
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monitoring means operatively coupled to the source of electrical power for providing an electrical state signal representative of the electrical current being drawn by operation of the cellular telephone; means, operatively coupled to said monitoring means to receive said electrical state signal, for generating a voltage state signal having a value representative of the electrical current being drawn by the operation of the cellular telephone from the source of electrical power; status determination means for receiving and monitoring said voltage state signal and for generating a powered up state signal whenever the value of said voltage state signal increases from a first selected lower value to a first selected higher value for a first preselected period of time; incoming call detection means for receiving said powered up state signal and monitoring said voltage state signal, and for generating an alarm start signal whenever said powered up state signal is present and said voltage state signal is representative of a first selected current transient in the current being drawn by the cellular telephone for a second preselected period of time; alarm means operative upon receipt of said alarm start signal for indicating an incoming call to a user; alarm cutoff means for monitoring said voltage state signal and disabling said alarm means from further operation whenever the value of said voltage state signal is representative of a second selected current transient in the current being drawn by the cellular telephone; and
,cutoff means for monitoring said voltage state signal and disabling said status determination means from further operation whenever the value of said voltage state signal drops below a preselected cutoff value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus, monitoring the electrical power demands made by operation of a cellular telephone on a source of electrical power, for indicating an incoming telephone call to a user, comprising:
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monitoring means operatively coupled to the source of electrical power for providing an electrical state signal representative of the electrical current being drawn by operation of the cellular telephone; means, operatively coupled to said monitoring means to receive said electrical state signal, for generating a voltage state signal having a value representative of the current being drawn by the operation of the cellular telephone from the source of electrical power; status determination means for receiving and monitoring said voltage state signal and for generating a powered up state signal whenever the value of said voltage state signal increases from a first selected lower value to a first selected higher value for a first preselected period of time; incoming call detection means for receiving said powered up state signal and monitoring said voltage state signal, and for generating an alarm start signal whenever said powered up state signal is present and said voltage state signal is representative of a selected current transient in the current being drawn by the cellular telephone for a second preselected period of time; and
,alarm means operative upon receipt of said alarm start signal for indicating an incoming call to a user. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An method for monitoring the electrical power demands made by operation of a cellular telephone on a source of electrical power, for indicating an incoming telephone call to a user, comprising:
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monitoring the electrical current being drawn by the operation of the cellular telephone from the source of electrical power and generating an electrical state signal representative of the electrical current being drawn by operation of the cellular telephone; receiving said electrical state signal and generating, based thereon, a voltage state signal having a value representative of the current being drawn by the operation of the cellular telephone from the source of electrical power; generating a powered up state signal whenever the value of said voltage state signal increases from a first selected lower value to a first selected higher value for a first preselected period of time; generating an alarm start signal whenever said powered up state signal is present and said voltage state signal is representative of a selected current transient in the current being drawn by the cellular telephone for a second preselected period of time; and
,generating an alarm signal perceptible by a user upon receipt of said alarm start signal for indicating an incoming call. - View Dependent Claims (22, 23, 24, 25)
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Specification