Pager with escalating audio alert signal level
Patent 4237448 Issued on December 2, 1980. Estimated Expiration Date: 
April 30, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 30, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDigital electronic control and switching arrangement Alerting system with dual-address memory Patent #: 4145684 InventorAssigneeApplicationNo. 06/034302 filed on 04/30/1979US Classes:340/7.62, Audible340/384.7, Electronic340/392.3Volume controlExaminersPrimary: Yusko, Donald J.Attorney, Agent or FirmInternational ClassesG08B 3/00 (20060101)G08B 3/10 (20060101) H03G 1/02 (20060101) H03G 1/00 (20060101) AbstractAn alerting device, such as a radio pager, which produces an audible alerting signal includes a signal level control which causes the alerting signal to be initially produced at a low audio level, with the signal increasing or escalating to a higher audio level. The signal level can increase continuously in a smooth rise, or can increase in steps. The level control can include an attenuator which initially reduces the signal level, to which a control signal is applied to reduce the attenuation and increase the alerting signal. The attenuator can be coupled to an audio amplifier so that the overall gain of the signal applied to the transducer producing the audible signal is increased from an initial low signal level as the signal continues. | |
