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| Number | Title | Issue Date |
| 5052023 | Method and apparatus for received signal equalization A bipolar return-to-zero signal received from a communication channel (302) is sampled (402) to provide signal information that is processed (FIG. 5) to determine signal variation information. In accordance with this signal variation information, at least... | 09/24/1991 |
| 4965569 | Digitized stored voice paging receiver A paging receiver device and method are disclosed in which analog information transmitted from an external source such as a paging transmitter are received and decoded. The analog information includes at least one voice message. The voice message is recov... | 10/23/1990 |
| 4962545 | Volume level retention in a pager A selective call reciver, particularly a pager, is provided comprising an audio transducer for emitting audio signals, particularly voice. A volume setter is provided and a device, such as involatile memory, for protecting the volume setter when the recei... | 10/09/1990 |
| 4962377 | Paging by text matching A selective call system is provided in which string searching or text matching operations are performed on data from data generating devices such as condition sensors in a security system. When a predetermined string is identified, an address of a selecti... | 10/09/1990 |
| 4949085 | Prioritization of stored messages in a digital voice paging receiver A device and method are disclosed for saving stored messages in a digital stored voice paging receiver. The digital stored voice paging receiver includes a plurality of message slots, each slot capable of storing a digitized voice message. A status value ... | 08/14/1990 |
| 4942598 | Telephone answering machine in paging systems with automatic number identification based message operations An automatic telephone answering device employing an Automatic Number Identification (ANI) decoder to selectively perform operations on a telephone call is described. The device may perform such operations as to selectively not respond, end, record or for... | 07/17/1990 |
| 4928314 | Heterodyne stage having precise closed-loop control of the amplitude of the injection signal thereof A heterodyne stage of a receiver which includes a conventional mixer circuit and local oscillator circuit further includes a differential amplifier circuit which measures the amplitude of the injection signal generated by the local oscillator circuit and ... | 05/22/1990 |
| 4928086 | Pager receiver having a common timer circuit for both sequential lock-out and out-of-range A pager receiver includes at least one lock-out circuit, an out-of range circuit, and a single timer coupled to the lock-out and out-of range circuits and responsive to timing signals generated by the pager for generating an initiated one of either the lo... | 05/22/1990 |
| 4926141 | Frequency synthesizer with improved automatic control of loop bandwidth selection A method of and apparatus for automatically selecting one of first and second loop bandwidth states of a phase lock loop circuit of a frequency synthesizer. The phase lock loop circuit is governed by a reference frequency signal and a feedback frequency s... | 05/15/1990 |
| 4901033 | Frequency synthesizer with dynamically programmable frequency range of selected loop bandwith A frequency synthesizer which includes at least one phase lock loop operative in a selected loop bandwidth state includes a dynamically programmable control circuit for setting the frequency range of its selected loop bandwidth state. In another aspect, t... | 02/13/1990 |
| 4901036 | Frequency synthesizer with an interface controller and buffer memory A frequency synthesizer which has at least one programmably characterized phase lock loop circuit includes a buffer memory and an interface controller responsive to operational codes received from a central controller to direct transfer of data words for ... | 02/13/1990 |
| 4893094 | Frequency synthesizer with control of start-up battery saving operations A frequency synthesizer governed by a battery saving signal having sleep and awake cycles comprises a phase locked loop and a control circuit for enhancing the restart operation of the phase locked loop at the commencement of each awake cycle of the batte... | 01/09/1990 |
| 4891637 | Acknowledge back pager with apparatus for controlling transmit frequency An acknowledge back (ack-back) pager is provided for use in a paging system including a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back p... | 01/02/1990 |
| 4885577 | Paging system for providing a data message and a voice message to a unique address of a paging receiver A paging system is provided for transferring data and voice messages to a unique address of a paging receiver. The system includes a paging controller, an encoder, a transmitter, and a paging receiver. The paging controller receives voice and data informa... | 12/05/1989 |
| 4882729 | Paging controller having a multiplex bus arrangement A paging controller for a paging communication system exchanges information by a global multiplexed bus arrangement. The bus arrangement permits voice, data and control information to be exchanged between a common memory and a plurality of I/O modules in ... | 11/21/1989 |
| 4882579 | Code division multiplexed acknowledge back paging system An acknowledge back (ack-back) paging system is provided which includes a central station which transmits a group of message signals to an group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicat... | 11/21/1989 |
| 4875038 | Frequency division multiplexed acknowledge back paging system An acknowledge back (ack-back) paging system is provided which includes a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate... | 10/17/1989 |
| 4873520 | Paging receiver for storing digitized voice messages A selective call paging receiver for receiving analog voice information converts the analog information to digital information and stores the digital information in a memory of the paging receiver. In a first embodiment, the paging receiver includes a har... | 10/10/1989 |
| 4872005 | Paging receiver capable of reminding a user of an important message event An electronic paging receiver for reminding a user of an important event includes a time of day clock for recording the time when a data message is received. The paging receiver computes a future alert time to remind the user of the receipt of the data me... | 10/03/1989 |
