| Patent Number |
Title Of Patent |
Date Issued |
| 5065423 |
Paging system with registration mode |
November 12, 1991 |
| The user of a new pager places it into "registration mode" by commands entered through the pager's user interface. In registration mode, the pager displays previously stored identification code and begins rapidly searching through a list of candidate paging channels. The user then te |
| 5054051 |
Autodial from database in an electronic wristwatch |
October 1, 1991 |
| A system and method to autodial a telephone number, employing (1) an electronic wristwatch which includes means for receiving radio paging messages and a memory for storing a database of predetermined multidigit telephone numbers and (2) a collapsible compact telephone handset, which |
| 5045717 |
Combined bias supply and power shut-off circuit with selective biasing |
September 3, 1991 |
| A microcircuit bias-current supply in a wristwatch-pager. An FM-radio receiver in a microcircuit paging device operates intermittently with a short on-time and long off-time to reduce power consumption and preserve battery life. The bias-supply circuit distributes predetermined bias |
| 5031233 |
Single chip radio receiver with one off-chip filter |
July 9, 1991 |
| The present invention provides an improved single chip radio receiver which has less external components than do previous similar receivers. With the present invention the integrated circuit which includes the radio receiver also has an on-chip adaptive filter. The radio receiver is desi |
| 5029237 |
Radio receiver frequency control system |
July 2, 1991 |
| Frequency control in a miniature receiver is effected by a synthesizer that is operated briefly to provide a tuning voltage to a voltage controlled local oscillator. A capacitor is shunted across the output of the synthesizer and is charged to the level of the tuning voltage. After the |
| 5016273 |
Dual communication mode video tape recorder |
May 14, 1991 |
| The present invention is a dual communication mode sysem that combines a point to point communications device with a television receiver and a video tape recorder. The result is a highly versatile and easily operated personal entertainment and communication center. The point to point |
| 4999516 |
Combined bias supply power shut-off circuit |
March 12, 1991 |
| A microcircuit bias-current supply in a wristwatch-pager. An FM-radio receiver in a microcircuit paging device operates intermittently with a short on-time and long off-time to reduce power consumption and preserve battery life. Ths bias-supply circuit distributes predetermined bias |
| 4978930 |
Low voltage VCO temperature compensation |
December 18, 1990 |
| A circuit for temperature compensation of a varactor voltage controlled oscillator control signal includes a proportional to absolute temperature (PTAT) current source and an adjustable, temperature stable current source. The difference between these two current sources defines an offset |
| 4977399 |
Mobile radio paging test system |
December 11, 1990 |
| In a ratio paging system of the type having digital data modulated onto radio signals transmitted from a radio station to receiving units at remote sites, a test system. The test system includes a transmitter test module coupled to a radio transmitter at the station and a test bed module |
| 4961184 |
Integrate and hold amplifier |
October 2, 1990 |
| The present invention relates to a system which uses information in a certain band of frequencies, f.sub.b. The information of interest is contained in an analog signal that has noise at higher frequencies. The analog signal is sampled using an integrate and hold amplifier, hence, no |
| 4944025 |
Direct conversion FM receiver with offset |
July 24, 1990 |
| A direct conversion FM receiver that includes AC coupling and automatic gain control employs an offset frequency at the first local oscillator. The offset frequency prevents the frequency spectrum occupied by the signal modulation from being affected by AC coupling. The offset frequency |
| 4922260 |
Adjustable watchband with embedded antenna |
May 1, 1990 |
| The present invention provides a means of maintaining a constant tuned frequency as a wrist band antenna is lengthened and shortened. As a wrist band antenna is lengthened, the inductance of the antenna is generally increased. The present invention provides a wrist band the length of the |
| 4897835 |
High capacity protocol with multistation capability |
January 30, 1990 |
| A wide area paging system is disclosed in which paging messages input to the system in one local area can be broadcast to a receiver in any other local area without necessarily broadcasting the message in all areas. A local area clearinghouse in each area stores resident subscriber data |
| 4893341 |
Digital receiver operating at sub-nyquist sampling rate |
January 9, 1990 |
| A digital receiver samples data from an amplitude modulated subcarrier at a rate less than twice the subcarrier's maximum frequency by sampling at known phase points. Sampling at known phase points is achieved by generating a sampling clock from a signal phase locked to and transmitted |
| 4885802 |
Wristwatch receiver architecture |
December 5, 1989 |
| A wristwatch FM subcarrier paging receiver architecture is disclosed that overcomes the many inherent problems (such as self-oscillation, image responses, spurious local oscillator radiation and interference from entertainment programming) that are encountered in this demanding appli |
| 4885763 |
Voice mail system with improved detection and cancellation |
December 5, 1989 |
| A voice mail system includes method and apparatus for muting a previously recorded audio signal upon detection of a DTMF signal to differentiate between recorded DTMF signals and valid DTMF commands. A DTMF signal detected after muting is recognized as an invalid command. |
| 4870372 |
AGC delay on an integrated circuit |
September 26, 1989 |
| Circuitry is disclosed for staggering the onset of gain reduction in a series of cascaded gain stages as a function of received signal strength. The staggering is effected by controlling the area ratio between corresponding components in two or more AGC control circuits whose topolog |
| 4747126 |
Voice mail system on magnetic tape |
May 24, 1988 |
| The present invention is a magnetic tape-based "voice mail" multi-user message system. The system transmits audio prompts to callers to help guide them through the various procedures. The callers respond with Touch-Tone commands. A novel circuit is provided to detect these tone comma |
| 4713808 |
Watch pager system and communication protocol |
December 15, 1987 |
| A wide area paging system is disclosed in which paging messages input to the system in one local area can be broadcast to a receiver in any other local area without necessarily broadcasting the message in all areas. A local area clearinghouse in each area stores resident subscriber data |
