Patents by Inventor Charles H. Carter
Charles H. Carter has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 10230411Abstract: A method and apparatus for distinguishing voice signals that are played together over the same speaker employs spectral reshaping of one or more of the audio signals. The spectral reshaping shifts modifies the timber of the voice signal while not modifying the pitch of the voice signal. Additional techniques can be used to further distinguish voice signals, such as dynamic gain offset and frequency shifting. After processing one or more signals to spectrally reshape them, they can be played over the same speaker. A user hearing the resulting acoustic signal will be more able to distinguish between the multiple voice signals being played.Type: GrantFiled: April 30, 2014Date of Patent: March 12, 2019Assignee: MOTOROLA SOLUTIONS, INC.Inventors: Jian Han, Charles H Carter, Jesus F Corretjer, Meng-Ge Duan, Yi Gao, Cheah Heng Tan
-
Publication number: 20170149461Abstract: A method and apparatus for distinguishing voice signals that are played together over the same speaker employs spectral reshaping of one or more of the audio signals. The spectral reshaping shifts modifies the timber of the voice signal while not modifying the pitch of the voice signal. Additional techniques can be used to further distinguish voice signals, such as dynamic gain offset and frequency shifting. After processing one or more signals to spectrally reshape them, they can be played over the same speaker. A user hearing the resulting acoustic signal will be more able to distinguish between the multiple voice signals being played.Type: ApplicationFiled: April 30, 2014Publication date: May 25, 2017Applicant: MOTOROLA SOLUTIONS, INC.Inventors: JIAN HAN, CHARLES H CARTER, JESUS F CORRETJER, MENG-GE DUAN, YI GAO, CHEAH HENG TAN
-
Patent number: 9473188Abstract: A portable radio communication device is provided that receives communications on a primary channel and a secondary channel as part of a dual-watch mode of operation. The portable radio communication device detects a gesture associated with the portable radio communication device and identifies a channel from one of the primary channel and the secondary channel corresponding to the detected gesture. Further, the portable radio communication device associates controls of a user interface in the portable radio communication device to the identified channel for controlling one or more operational parameters pertaining to the identified channel during the dual-watch mode of operation.Type: GrantFiled: May 21, 2013Date of Patent: October 18, 2016Assignee: MOTOROLA SOLUTIONS, INC.Inventors: Jesus F Corretjer, Mohd Syazani B Abdul Aziz, Charles H Carter
-
Patent number: 8971456Abstract: A receiver for a wireless communication device provides a dual path receiver receiving first and second protocol-agnostic, uncorrelated receive signals simultaneously. The dual path receiver generating first and second offset IF signals from the simultaneously received first and second protocol-agnostic, uncorrelated receive signals. The receiver utilizes at least one converter for converting the first and second offset IF signals into at least one serial synchronous interface (SSI) signal representing the spectrum at IF. At least one processor receives the at least one SSI signal and applies parallel processing paths to demodulate the at least one SSI signal into separate baseband signals. The processor provides interference detection of, and level control for, the first and second offset IF signals.Type: GrantFiled: December 19, 2011Date of Patent: March 3, 2015Assignee: Motorola Solutions, Inc.Inventors: Ariel L. Galan, Young-Seo Park, Charles H. Carter, Charles R. Ruelke, Darrell Stogner
-
Publication number: 20140349588Abstract: A portable radio communication device is provided that receives communications on a primary channel and a secondary channel as part of a dual-watch mode of operation. The portable radio communication device detects a gesture associated with the portable radio communication device and identifies a channel from one of the primary channel and the secondary channel corresponding to the detected gesture. Further, the portable radio communication device associates controls of a user interface in the portable radio communication device to the identified channel for controlling one or more operational parameters pertaining to the identified channel during the dual-watch mode of operation.Type: ApplicationFiled: May 21, 2013Publication date: November 27, 2014Applicant: MOTOROLA SOLUTIONS, INCInventors: JESUS F. CORRETJER, MOHD SYAZANI B. ABDUL AZIZ, CHARLES H. CARTER
-
Patent number: 8565702Abstract: A channel scanning technique and apparatus provides audio hole suppression in two-way radio communications. Upon detecting the absence of a carrier signal on a priority channel during a priority scan mode of operation, a training waveform is constructed upon returning to the home-channel. The training waveform is applied to audio shaping filters within an audio lineup to suppress transients and minimize or eliminate the occurrence of audio pops at a speaker output thereby reducing the audio hole.Type: GrantFiled: June 16, 2010Date of Patent: October 22, 2013Assignee: Motorola Solutions, Inc.Inventors: Geetha K. Thampi, Charles H. Carter, Jesus F. Corretjer, Yadunandana N. Rao
-
Publication number: 20130156134Abstract: A receiver for a wireless communication device provides a dual path receiver receiving first and second protocol-agnostic, uncorrelated receive signals simultaneously. The dual path receiver generating first and second offset IF signals from the simultaneously received first and second protocol-agnostic, uncorrelated receive signals. The receiver utilizes at least one converter for converting the first and second offset IF signals into at least one serial synchronous interface (SSI) signal representing the spectrum at IF. At least one processor receives the at least one SSI signal and applies parallel processing paths to demodulate the at least one SSI signal into separate baseband signals. The processor provides interference detection of, and level control for, the first and second offset IF signals.Type: ApplicationFiled: December 19, 2011Publication date: June 20, 2013Applicant: MOTOROLA SOLUTIONS, INC.Inventors: Ariel L. Galan, Young-Seo Park, Charles H. Carter, Charles R. Ruelke, Darrell Stogner
-
Publication number: 20110312294Abstract: A channel scanning technique and apparatus provides audio hole suppression in two-way radio communications. Upon detecting the absence of a carrier signal on a priority channel during a priority scan mode of operation, a training waveform is constructed upon returning to the home-channel. The training waveform is applied to audio shaping filters within an audio lineup to suppress transients and minimize or eliminate the occurrence of audio pops at a speaker output thereby reducing the audio hole.Type: ApplicationFiled: June 16, 2010Publication date: December 22, 2011Applicant: MOTOROLA, INC.Inventors: Geetha K. Thampi, Charles H. Carter, Jesus F. Corretjer, Yadunandana N. Rao
-
Patent number: 7492909Abstract: A method of acoustic transducer calibration (200, 400) using a band limited pseudo random noise source with an internal digital signal processor (209, 403) to tailor audio characteristics of an internal microphone 103 and internal speaker (301) within a communications device (101) to insure consistent amplitude and frequency characteristics of these microphone and speaker transducer devices. The method offers and advantage such that tuning of the amplitude and frequency response consistently converges to the desired filter response with a filter type offering operational stability.Type: GrantFiled: April 5, 2001Date of Patent: February 17, 2009Assignee: Motorola, Inc.Inventor: Charles H. Carter, Jr.
-
Patent number: 7133468Abstract: A method and apparatus are provided which detects distortion in a received FM signal caused by amplitude modulating and phase transition of two combined FM signals. A method corrects and modifies the distortion by detecting a distorted sample, replacing the distorted sample with an appropriate sample, and applying a smoothing process to the sample.Type: GrantFiled: October 17, 2002Date of Patent: November 7, 2006Assignee: Motorola, Inc.Inventors: Charles H. Carter, Jr., Amish Pravinbhai Shah
-
Patent number: 7085390Abstract: A method for controlling audio gain balance in a multi-mode communications device (200) includes providing (201) microphone audio input to the multimode communications device. The audio is supplied to an amplifier gain stage while a dynamic instantaneous energy value of the audio input is computed (203) when in a first operational mode such as an analog mode. A predetermined gain algorithm is processed (207) representing an audio input when in a second mode such as a digital mode using the energy value. The audio gain stage in the multi-mode communications device is then adjusted (209) so that audio gain when in the first mode substantially approximates an audio gain when in an second mode. This provides a consistent audio amplitude output when receiving the first and second modes in a radio receiver.Type: GrantFiled: May 4, 2001Date of Patent: August 1, 2006Assignee: Motorola, Inc.Inventors: Charles H. Carter, Jr., Karthik Narasimhan
-
Publication number: 20040076242Abstract: A method and apparatus are provided which detect distortion in a received FM signal caused by amplitude modulating and phase transition of two combined FM signals. The method (90) corrects and modifies the distortion by detecting a distorted sample (112), replacing the distorted sample with an appropriate sample (118), and applying a smoothing process (114) to the sample.Type: ApplicationFiled: October 17, 2002Publication date: April 22, 2004Inventors: Charles H. Carter, Amish Pravinbhai Shah
-
Publication number: 20020164039Abstract: A method for controlling audio gain balance in a multi-mode communications device (200) includes providing (201) microphone audio input to the multimode communications device. The audio is supplied to an amplifier gain stage while a dynamic instantaneous energy value of the audio input is computed (203) when in a first operational mode such as an analog mode. A predetermined gain algorithm is processed (207) representing an audio input when in a second mode such as a digital mode using the energy value. The audio gain stage in the multi-mode communications device is then adjusted (209) so that audio gain when in the first mode substantially approximates an audio gain when in an second mode. This provides a consistent audio amplitude output when receiving the first and second modes in a radio receiver.Type: ApplicationFiled: May 4, 2001Publication date: November 7, 2002Inventors: Charles H. Carter, Karthik Narasimhan
-
Publication number: 20020146136Abstract: A method of acoustic transducer calibration (200, 400) using a band limited pseudo random noise source with an internal digital signal processor (209, 403) to tailor audio characteristics of an internal microphone 103 and internal speaker (301) within a communications device (101) to insure consistent amplitude and frequency characteristics of these microphone and speaker transducer devices. The method offers and advantage such that tuning of the amplitude and frequency response consistently converges to the desired filter response with a filter type offering operational stability.Type: ApplicationFiled: April 5, 2001Publication date: October 10, 2002Inventor: Charles H. Carter
-
Patent number: 5949821Abstract: A communication device (100) includes an equalizer (126) for correcting imbalance between in-phase and quadrature components of a received signal. The equalizer (126) determines peak amplitude for the in-phase and quadrature components, and the phase imbalance between both components (440). At least one of the in-phase and quadrature components is adjusted based on a function of the phase imbalance, and of the ratio of peak amplitudes of the in-phase and quadrature components (450, 460).Type: GrantFiled: August 5, 1996Date of Patent: September 7, 1999Assignee: Motorola, Inc.Inventors: Shahriar Emami, Charles H. Carter