Patents Represented by Attorney, Agent or Law Firm Richard A. Sonnentag
  • Patent number: 6449305
    Abstract: Handoff from a Code-Division, Multiple Access (CDMA) protocol to an Advanced Mobile Phone Service (AMPS) protocol occurs by comparing a remote unit's (405) phase shift measurement to a threshold (503) and determining a reference CDMA base station (401) from an active set of CDMA base stations (515). Next, corrected phase shifts are calculated for each CDMA base station in the active set (521) and the remote unit (405) is handed off to an AMPS base station (109) underlying the CDMA coverage area (126) having the smallest corrected phase shift (525).
    Type: Grant
    Filed: May 10, 1996
    Date of Patent: September 10, 2002
    Assignee: Motorola, Inc.
    Inventors: Barry J. Menich, James P. Aldrich, Samuel D. Fernandez
  • Patent number: 6415252
    Abstract: Bits are allocated to short-term repetition information for unvoiced input signals. Stated differently, more bits are allocated for pitch information during unvoiced input speech than in the prior art. The improved method and apparatus in an encoder (300) and decoder (700) result in improved consistency of amplitude pulses compared to prior art methods which indicates improved stability due to increased search resolution. Also, the improved method and apparatus result in higher energy compared to prior art methods which indicates that the synthesized waveform matches the target waveform more closely, resulting in a higher fixed codebook (FCB) gain.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: July 2, 2002
    Assignee: Motorola, Inc.
    Inventors: Weimin Peng, James Patrick Ashley
  • Patent number: 6240100
    Abstract: A receiver (10) corrects for dynamic DC offsets by utilizing an open loop predictive DC offset correction stage (18) to respond instantly to changes in AGC settings on a timeslot by timeslot basis. The receiver has an AC coupled baseband receiver and has memory (22) for storing calibration offset data (24 and 26) representing a calibration offset voltage value for each automatic gain control (AGC) state determined relative to a known reference value. The predictive DC offset stage (18) predicts a predictive DC offset correction value (74 and 76) for a selected timeslot using stored calibration offset data (24 and 26) and an average of stored calibration offset data corresponding to AGC states for all timeslots in a given frame.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: May 29, 2001
    Assignee: Motorola, Inc.
    Inventors: Kenneth B. Riordan, Neil Peplinski, David J. Anderson
  • Patent number: 6173005
    Abstract: Orthogonal transmit diversity is implemented by employing a data splitter (803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits (804). Each portion is spread with its own Walsh code for eventual transmission to a mobile station via a predetermined carrier frequency. When the number of bits in the first and second portion (802, 804) are small, separate Walsh codes are used to maintain orthogonality. When the number of bits in the first and second portion (802, 804) are relatively large, a time-division multiplex transmission is used to maintain orthogonality. A controller (809) controls the subdivision of the channel information and also an interleaver (308) to further enhance the effects of the diversity transmission. Control information related to the subdivision is transmitted to the mobile station so the channel information can be accurately reconstructed prior to decoding.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: January 9, 2001
    Assignee: Motorola, Inc.
    Inventors: Michael D. Kotzin, Kamyar Rohani, Walter J. Rozanski, Jr.
  • Patent number: 6157669
    Abstract: A frequency-hopping communication system preempts certain burst frequency assignments. The communication system is capable of communicating to mobile stations (114, 115) via a radio channel (121) in a TDM/TDMA mode. A plurality of mobile stations are assigned burst frequencies for transmission during timeslots of the TDMA system. To support additional mobile stations without additional burst frequencies, the communication system preempts the burst frequency assignment from the plurality of mobile stations, and utilizes the preempted assignment to support communication to the additional mobile stations.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: December 5, 2000
    Assignee: Motorola, Inc.
    Inventor: Michael D. Kotzin
  • Patent number: 6141638
    Abstract: A speech coder (400) for coding an information signal varies the codebook configuration based on parameters inherent in the information signal. The speech coder (400) requires no additional overhead for sending of mode parameters while allowing subframe resolution. The configurations vary not only for voicing level, but also for pitch period since different physiological traits yield different codebook configurations. A dispersion matrix (406) within the speech coder (400) facilitates a codebook search which is performed on vectors whose length can be less than a subframe length. Additionally, use of the dispersion matrix (406) allows the addition of random events for very slightly voiced speech which incurs little computational overhead but produces a rich excitation.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: October 31, 2000
    Assignee: Motorola, Inc.
    Inventors: Weimin Peng, James Patrick Ashley
  • Patent number: 6134444
    Abstract: A method and apparatus for balancing uplink and downlink signal transmissions in a code-division multiple access (CDMA) communication system (100) is disclosed. In the preferred embodiment, a system level change is performed (303) and parameters related to the uplink (107) and downlink (108) transmissions are analyzed (306). The uplink (107) and downlink (108) transmissions are balanced (309) by, inter alia, increasing or decreasing the downlink transmission power at a base-station (101, 106), systematically adding loss or noise to a receiver located at a base-station (101, 106) or both.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: October 17, 2000
    Assignee: Motorola, Inc.
    Inventor: Michael D. Kotzin
  • Patent number: 6134521
    Abstract: Audio degradation is minimized in scenarios where tandem coding occurs. One such scenario is in the environment of voice mail service. Characteristics of an audio information signal are determined, and the signal is classified as to whether further coding should be performed and, if so, which rate/type of coding should be performed. Characteristics of the audio signal which are determined are, inter alia, quality characteristics, rate of previous coding, type of previous coding and the source of previous coding of the audio information signal. The source of previous coding determined may further include, inter alia, an analog network, a digital network, a PSTN or a wireless communication system. Based on this information, the voice mail service will either choose not to further code the audio information signal or code the audio information signal with the best coding algorithm available.
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: October 17, 2000
    Assignee: Motorola, Inc.
    Inventor: Michael Dale Kotzin
  • Patent number: 6125137
    Abstract: A base station receiver assembly (400) for performing a signal search, which operates in a coherent code division multiple access (CDMA) wireless communication system conveying a mobile communication signal is disclosed. The assembly (400) includes a multipath signal searcher (200), a receiver (300), and an energy adjustment generator (490). The energy adjustment generator operates to combine an energy metric (241) from the multipath signal searcher (200) with a symbol match count (447) to yield a signal (448) for weighting inputs to a finger manager (260). The symbol match count (447) is based on a count, resulting from a comparison of a number of times an output from the multipath signal searcher (200) matched an output from the receiver (300). The symbol match count (447) is representative of a likelihood that a time offset selected by the finger manager (260) corresponds to a time offset of the mobile communication signal (107).
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: September 26, 2000
    Assignee: Motorola, Inc.
    Inventors: Michael Mao Wang, Tyler Brown
  • Patent number: 6113653
    Abstract: An open-loop delay contour estimator (204) generates delay information during coding of an information signal. The delay contour is adjusted according to an error minimization criterion on a subframe basis, which allows a more precise estimate of the true delay contour. A delay contour reconstruction block (211) uses the delay information in a decoder in reconstructing the information signal.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: September 5, 2000
    Assignee: Motorola, Inc.
    Inventors: James P. Ashley, Weimin Peng
  • Patent number: 6107880
    Abstract: The present invention provides for a method and apparatus for increasing the linearity of the phase and gain of an amplifier circuit (10, 22). The amplifier circuit (10, 22) maintains linearity of the amplified output signal by monitoring the power levels of the input signal, and adjusting the supply voltage level(s) of the amplifier (18), based upon the measured input power levels. By appropriately adjusting the supply voltage level(s) of the amplifier (18) an output signal having a consistent gain and phase can be realized. Preferably a delay circuit (26) will be used to delay receipt of the input signal by the amplifier (18), so as to synchronize receipt of the input signal with the corresponding source voltage adjustments. The value of the delay preferably corresponds to the time for the envelope detector (14) to measure the instantaneous input power levels and the time for the processing unit (16) to determine and apply the appropriate supply voltage level(s) to the amplifier (18).
    Type: Grant
    Filed: August 6, 1998
    Date of Patent: August 22, 2000
    Assignee: Motorola, Inc.
    Inventor: Michael Joseph Shaw
  • Patent number: 6104993
    Abstract: To accurately determine rate and voice activity in moderate-to-low signal-to-noise ratios (SNRs) to maximize voice quality, system capacity and/or battery life, parameters from a noise suppression system are used as inputs to the rate determination function. Using this method, more of the speech is extracted from the background noise and a lower number of false onsets during fluctuating noise conditions compared with conventional systems are detected. The method is beneficial for voice activity detection (VAD) as well as rate determination (RDA) and unlike other RDA/VAD implementations, is independent of the type of speech coder employed (IS-127, CDG-27, IS-96 and GSM).
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: August 15, 2000
    Assignee: Motorola, Inc.
    Inventor: James P. Ashley
  • Patent number: 6091962
    Abstract: A method and corresponding apparatus for re-establishing a communication in a wireless communication system is disclosed. A serving base-station (32) detects that a synchronization with a mobile station (38) has been lost and chooses a target base-station (34) to attempt to establish synchronization with the mobile station (38). If synchronization is established, the communication with the mobile station (38) is re-established by the target base-station (34). The method and corresponding apparatus does not require any handoff-related signaling to the mobile station (38) to essentially effect a communication handoff from the serving base-station (32) to the target base-station (34).
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: July 18, 2000
    Assignee: Motorola, Inc.
    Inventor: Jeffrey D. Bonta
  • Patent number: 6092230
    Abstract: A communication system implements detection of bad frames of information by utilizing multiple bit correction thresholds. Equipment used within the communication system adapts to different signaling environments by dynamically altering the bit correction threshold based on a history of the number of consecutive bad frames of information that have been previously erased and the number of bits corrected by a channel decoder (202). By implementing this dynamic bit correction threshold, sufficient bad frame indication (BFI) detection and receiver sensitivity can be obtained simultaneously, which results in an improved perceived audio quality to the end user.
    Type: Grant
    Filed: September 15, 1993
    Date of Patent: July 18, 2000
    Assignee: Motorola, Inc.
    Inventors: Sandra L. Wood, Thomas J. Kundmann, Lee M. Proctor, Ken Stewart
  • Patent number: 6084890
    Abstract: A method and apparatus of combining carrier signals (110, 111) includes in a coupler (125) phase shifting signals (110, 111) by substantially 90 degrees to produce phase shifted signals (120, 121), coupling signals (110, 121) to produce a coupled signal (130) and the signals (111, 120) to produce a coupled signal (140). In phase shifters (450, 460), the coupled signals (130, 140) are independently phase shifted according to two independent frequency selective phase shifting functions (150, 160) to produce phase shifted coupled signals (170, 180) which are combined at combiner (190) to produce a combined carrier signal (199). A phase shifting attribute of functions (150, 160) is divided over predetermined frequency bands (210, 220, 230). Over the frequency bands (210) phase shift (260) leads phase shift (250) and lags over the frequency band (230) by substantially 90 degrees.
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: July 4, 2000
    Assignee: Motorola, Inc.
    Inventor: Dale Robert Anderson
  • Patent number: 6078571
    Abstract: A single transmitter (109) controlled to transmit at appropriate beacon signal frequencies (F1-F3) is scanned through each of the frequencies (F1-F3) so that a mobile station (101) can determine when a hard handoff to different frequencies (F4-F6) is required. The beacon signal transmitter (109) is controlled by a controller (112) to transmit beacon signals which include a pilot channel only, pilot/sync channels, pilot/page/sync channels common to each of the frequencies (F1-F3), or pilot/page/sync channels different for each of the frequencies (F1-F3). Additional control is provided by the controller (112) such that each of frequencies (F1-F3) is further transmitted to different sectors (A1-A3) when the coverage area supported by a target base-station (106) is sectorized.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: June 20, 2000
    Assignee: Motorola, Inc.
    Inventor: Scott M. Hall
  • Patent number: 6075989
    Abstract: In a wireless communication system, which includes a first base site (101) having an associated controller (130) and a second base site (108), a mobile station (103) responsive to the first and second base site, a method for determining a need to hard handoff a mobile communication signal (107) associated with the mobile station from the first base site to the second base site is disclosed. The method includes receiving a plurality of hard handoff candidate parameters associated with the mobile communication signal, and then measuring a plurality of scan result parameters associated with the mobile communication signal by a handoff scan receiver (304). The method further includes forwarding the plurality of scan result parameters to the controller, and then determining whether or not a hard handoff of the mobile communication signal is required based on the scan result parameters.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: June 13, 2000
    Assignee: Motorola, Inc.
    Inventors: Jay B. Moore, Jon Quin St. Clair
  • Patent number: 6072778
    Abstract: A code division multiple access (CDMA) communication system (100) has improved control by accurately characterizing coverage and loading parameters related to the CDMA communication system (100). To accurately characterize coverage and loading parameters related to the CDMA communication system, parameter meshes corresponding to parameters of the CDMA communication system are generated. The parameter meshes are evaluated, either individually or in combination, to provide comprehensive information regarding the performance of the CDMA communication system. Based on the results of the evaluation, a controller (113) within the CDMA communication system (100) controls the parameters to improve call quality, loading, etc. of the CDMA communication system (100).
    Type: Grant
    Filed: August 14, 1996
    Date of Patent: June 6, 2000
    Assignee: Motorola, Inc.
    Inventors: Gerald P. Labedz, Robert T. Love
  • Patent number: 6064266
    Abstract: A load limiting circuit (56) and method for limiting the output impedance seen by an amplifier (12), wherein a load limiting impedance (64), preferably a resister (94), is selectively coupled in parallel with the output impedance by a switch circuit (62), when a threshold detect circuit (60) detects the value of the output impedance (48) rising above a predetermined value. The output impedance is preferably measured by monitoring the output current through a resistor (70) connected in series with the output impedance (48).
    Type: Grant
    Filed: September 15, 1998
    Date of Patent: May 16, 2000
    Assignee: Motorola, Inc.
    Inventors: Dale Robert Anderson, James Orah Ashabraner
  • Patent number: 6049537
    Abstract: A method and system for controlling speech encoding in a communication system utilizes feedback information such as packet modification control data (154) sent from a communication link output controller, such as a network arbitor (142). The network arbitor (142) sends the packet modification control data (154) to a selected vocoder (146) to change the filter states of the selected vocoder (146) when the network arbitor (142) modifies an output speech packet communicated of a communication link (20), to facilitate improved convergence of a speech encoder and a speech decoder, such as a mobile subscriber unit.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: April 11, 2000
    Assignee: Motorola, Inc.
    Inventors: Lee Michael Proctor, James Patrick Ashley