Patents Represented by Attorney, Agent or Law Firm Pedro P. Hernandez
  • Patent number: 5331293
    Abstract: A digital frequency synthesizer circuit with spur compensation includes a demodulator circuit (118) for demodulating the output signal (116) of the synthesizer's accumulator (108). Demodulator (118) also inverts the signal, and provides an inverted demodulated output signal (142) which is then coupled to the synthesizer clock (124) after passing through a gain stage (122) in order to modulate the synthesizer clock (124) with a compensation signal (146). The compensated clock signal (140) is then sent to accumulator (108) in order to substantially cancel out any jitter in the accumulator's output signal (116). The modulation signal (MOD IN) which is digitally applied to accumulator (108) is applied in analog fashion to the gain stage (122) in order to prevent the desired modulation signal (MOD IN) from being canceled in the output signal (116).
    Type: Grant
    Filed: September 2, 1992
    Date of Patent: July 19, 1994
    Assignee: Motorola, Inc.
    Inventors: Wayne P. Shepherd, Joseph P. Heck
  • Patent number: 5329219
    Abstract: A charger includes a control circuit (308) for determining the charge rate and charge capacity of a battery (312). Control circuit (308) switches the rate at which battery (312) is being charged from a first charge rate such as a rapid charge rate (206) to a charge rate which is increasing in charge over time (208). Once battery (312) becomes fully charged, control circuit (308) then charges battery (312) at a third charge rate such as a trickle rate (214).
    Type: Grant
    Filed: April 28, 1993
    Date of Patent: July 12, 1994
    Assignee: Motorola, Inc.
    Inventor: Scott M. Garrett
  • Patent number: 5325040
    Abstract: A battery charger (102) includes an input terminal (124) for receiving control signals from radio (104). The control signals are received by a charge controller (112) which provides a charge rate to radio battery pack (106) which is a function of the control signal. Radio (104) includes a controller (126) which can sense the state of the radio battery pack (106), as well as changes in the state of radio (104). Controller (126) can then modify the control signal sent to charger (102) and therefor the battery charge rate proved by charger (102) based on certain changes in the state of battery pack (106) or radio (104).
    Type: Grant
    Filed: September 21, 1992
    Date of Patent: June 28, 1994
    Assignee: Motorola, Inc.
    Inventors: Henry A. Bogut, Joseph Patino, Allen L. Christenson
  • Patent number: 5319635
    Abstract: A communication unit (10) transmits a first signal (12) that has a plurality of holes (44) therein during the occurrence of which another communication unit may interrupt. A repeater (14) receives the first signal and transmits a second signal (16) comprising the information in the first signal, and a plurality of digital coded squelch words synchronized with the holes to indicate the location of at least one of the holes in the first signal (i.e., the time at which at least one of the holes will occur). In one embodiment, each hole occurs after each pair of coded squelch words, and accordingly the pairs of coded squelch words are marked to indicate the times of occurrence of holes in the first signal.
    Type: Grant
    Filed: December 7, 1992
    Date of Patent: June 7, 1994
    Assignee: Motorola, Inc.
    Inventors: John D. Reed, Walter J. Rozanski, Jr., Charles N. Lynk, Jr.
  • Patent number: 5307519
    Abstract: A circuit assembly (400) includes a flexible circuit (402) having first (504) and second layers (502). A current-limiting device such as a nichrome strip (316) is coupled to the flexible circuit (402) for limiting the amount of current during a short circuit condition. A heat sink (404) is selectively placed between the first and second layers of the flexible circuit in thermal proximity to the nichrome wire (316) in order to dissipate some of the heat generated by the nichrome strip (316).
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: April 26, 1994
    Assignee: Motorola, Inc.
    Inventors: Alay M. Mehta, Venus D. Desai
  • Patent number: 5303409
    Abstract: A receiver (100) includes an audio section (200) which provides for compensated squelch settings which are automatically adjustable for changes in operating conditions such as changes in temperature or receiver channel spacing. Temperature circuit (128) provides a temperature signal (134) and controller (122) provides a signal indicating the channel spacing being used by receiver (100). The two signals are combined and formed into an address word which is in turn used to look-up a compensation word from memory location (218). The compensation word is then combined to a default squelch word by adder (216) providing for a compensated squelch word. The compensated squelch word automatically adjusts the squelch circuit's threshold level in order to compensate for changes in operational conditions affecting the squelch circuit.
    Type: Grant
    Filed: June 4, 1992
    Date of Patent: April 12, 1994
    Assignee: Motorola, Inc.
    Inventors: Charles R. Ruelke, Alexander Rodriguez
  • Patent number: 5302963
    Abstract: A retractable antenna assembly with connector (200) allows communication devices that require the use of more than one type of antenna element (114), to easily store the normally used antenna element (114) inside of a housing (134) which is part of the antenna assembly (200). Once inside the housing (134), the antenna element (114) forms a half wave cavity that has a high impedance at the operating frequency of the communication device (302), thereby operatively decoupling the antenna element (114) from the radio frequency path. Once inside of housing (134), antenna element (114) forms part of a coaxial connector (112) with the top portion (116) of antenna element (114) forming the center conductor of the coaxial connector (112). Thereby allowing for an external antenna element (308) to be attached to the communication device (302).
    Type: Grant
    Filed: December 8, 1992
    Date of Patent: April 12, 1994
    Assignee: Motorola, Inc.
    Inventor: James T. Wiggenhorn
  • Patent number: 5301353
    Abstract: A communication device (16) comprises first and second transceivers and apparatus for determining when the communication device (16) is in an on-site area (11) and when the communication device (16) is in an off-site area. The first transceiver transmits and receives signals on a first communication medium (17), when the communication device (16) is in a first area (11); whereas, second transceiver transmits and receives signals on a second communication medium (28), when the communication device (16) is in a second area.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: April 5, 1994
    Assignee: Motorola, Inc.
    Inventors: Jaime A. Borras, David D. Johnson
  • Patent number: 5301360
    Abstract: A communication device (10) comprises a coupler (19) for coupling an external device (30) to the communication device, and controller (16) for controlling the communication device., The controller has at least first and second terminals (22 and 23) for receiving digital numbers from the external device, each digital number representing a mode of operation for the communication device. The controller also includes an apparatus for transmitting a test pulse to the external device, and an apparatus for receiving a response pulse in response to the test pulse. The response pulse has predetermined direction, duration and polarity indicating a mode of operation for the communication device.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: April 5, 1994
    Assignee: Motorola, Inc.
    Inventor: Arthur M. Goldberg
  • Patent number: 5301232
    Abstract: In a communication system (300), a controller interface (302) provides for monitoring of channel activity in order to determine communication devices (400) which are communicating using old encryption information. Upon a key management controller (306) determining that one or more communication devices are using an old encryption scheme, the key management controller (306) establishes communications with the communication device(s) (400) and provides them with the new encryption information.
    Type: Grant
    Filed: November 5, 1992
    Date of Patent: April 5, 1994
    Assignee: Motorola, Inc.
    Inventor: Keith I. Mulford
  • Patent number: 5301357
    Abstract: A system and method for providing automatic system deregistration for any incorrectly registered radios is described. The system and method further provides for an automatic re-registration request to be sent in order to guarantee that any valid radios that have the same radio identification information in the system as the incorrectly registered radio to become re-registered. By requesting any radio having the same ID to re-register back with the system, a loss of communication to that radio is thereby prevented.
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: April 5, 1994
    Assignee: Motorola, Inc.
    Inventor: Michael J. Thompson
  • Patent number: 5294749
    Abstract: A surface mountable molded electronic component (100) is made from formed wire having a main portion (202) and end portions (102 and 104) connected to the main portion (202). The electronic component (100) includes a first and second recess areas (108 and 110) in molded section (114) for allowing the end portions (102 and 104) to lie inside and provide for the component (100) to be surfaced mounted onto a printed circuit board.
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: March 15, 1994
    Assignee: Motorola, Inc.
    Inventors: James V. Lauder, Leng H. Ooi
  • Patent number: 5293140
    Abstract: A microstrip or stripline structure (10) is disclosed. A dielectric substrate (11) of ceramic includes an area (14) having a different electromagnetic characteristic. The differing dielectric characteristic can be provided by an area (14) in the substrate having a reduced thickness. A transmission line (13) is disposed on one side of the substrate and is partially disposed on the area of reduced thickness. An opposed conductor, such as a ground plane (12), is disposed on the opposite side of the substrate. For a microstrip (20), two such substrates are utilized.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: March 8, 1994
    Assignee: Motorola, Inc.
    Inventor: Robert J. Higgins
  • Patent number: 5287013
    Abstract: An electronic device such as a cordless telephone base station (100) includes a battery compartment (212) for storing back-up batteries. The battery compartment (212) has a cover (202) which prevents access to the back-up batteries. When the battery compartment cover (202) is attached, a safety interlock electrically connects the back-up battery contact terminals (204 and 206) found in the battery compartment (212) to the rest of the base station electronics 320. But when the battery compartment cover is opened, the safety interlock disconnects the battery terminals (204) and (206) from the rest of the electronics. In this way the base station user is protected from dangerous electrical shock which may become present at the battery contact terminals (204 and 206).
    Type: Grant
    Filed: February 3, 1992
    Date of Patent: February 15, 1994
    Assignee: Motorola, Inc.
    Inventor: Gary E. Adair
  • Patent number: 5280541
    Abstract: A method for re-establishing a communication link that has been lost between a portable unit (406) and a fixed unit or base station (402) provides for a way of quickly re-establishing the lost communication link, on the previously used RF channel. The method is begun by transmitting a link re-establishment code word (900) using MUX 1 after determining that synchronization has been lost (502) for a predetermined period of time (504). This is followed by automatically switching the portable unit (406) from MUX 1 to MUX 3 communication protocol. Followed by re-establishing communication (re-establish synchronization) between the portable (406) and base station (402) in MUX 3 and switching the two communication devices (402 and 406) back to MUX 1 after the communication link has been re-established. The same steps can be followed by base site (402) if it had been the first to detect loss of the communication link.
    Type: Grant
    Filed: October 24, 1991
    Date of Patent: January 18, 1994
    Assignee: Motorola, Inc.
    Inventors: Paul D. Marko, Stelios J. Patsiokas, Craig P. Wadin
  • Patent number: 5278990
    Abstract: A radio communication system includes a central station such as a repeater for transmitting FM signals to a plurality of radios. The repeater 11 is capable of receiving both analog speech FM signals and compressed voice signals. This permits the use of energy efficient transmission schemes by some of the radios operating in the system while permitting use of both types of transmission by the various remote radios.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: January 11, 1994
    Assignee: Motorola, Inc.
    Inventors: Anthony P. Van Den Heuvel, Michael D. Kotzin
  • Patent number: 5276454
    Abstract: A control and antenna mount assembly (100) includes an antenna mount portion (130) having a top portion (132) for mating to an antenna (142). Assembly (100) also includes an insert member (122), control knob (110) having selector contact (118) and a retainer ring (120) all connected to antenna mount (130), together forming a rotary switch, concentric to antenna mount (130).
    Type: Grant
    Filed: September 24, 1992
    Date of Patent: January 4, 1994
    Assignee: Motorola, Inc.
    Inventors: Armando J. Gonzalez, Steven J. Finch, Rudy Yorio
  • Patent number: 5274454
    Abstract: A programmable electronic product includes a video generator (120) and RF modulator (122) for interfacing with an external video monitor. The programmable electronic product can then be programmed by the product user with the programming information being displayed on the external video monitor.
    Type: Grant
    Filed: August 10, 1992
    Date of Patent: December 28, 1993
    Assignee: Motorola, Inc.
    Inventor: Robert J. Higgins, Jr.
  • Patent number: 5265262
    Abstract: A system and method for providing single channel remote site trunking is described. The present invention allows for radios (116) operating in single channel non-dedicated control channel sites (104) to communicate with radios (112, 114) in dedicated control channel sites (102) which are part of the system (100). Further, the present invention will allow for non-trunked radios to utilize the benefits of trunking when operating in the single channel remote site. By mapping the ID's of the radios in the system (100) the system can keep track of all radios in the system whether in a remote single site (104) or in one of the dedicated control channel sites (102) and thereby link allow radios in one site to automatically communicate with the radios in the other site.
    Type: Grant
    Filed: August 2, 1991
    Date of Patent: November 23, 1993
    Assignee: Motorola, Inc.
    Inventors: Gary W. Grube, John W. Wiens, David J. Kizior
  • Patent number: D348071
    Type: Grant
    Filed: August 17, 1992
    Date of Patent: June 21, 1994
    Assignee: Motorola, Inc.
    Inventors: Craig F. Siddoway, Stephen M. Stanton