Patents by Inventor Iqbal M. Surti

Iqbal M. Surti 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: 9225844
    Abstract: A system and method of communicating data between a vehicle and call center via a voice channel of a wireless communication system. The method carried out by the system includes the steps of: establishing a voice channel connection between a vehicle telematics unit and call center via a wireless cellular network; generating a modem signaling carrier comprising a prefix followed by a single frequency tone; sending the modem signaling carrier over the voice channel connection using an EVRC-B vocoder; establishing a data communication session over the voice channel connection in response to the modem signaling carrier; and thereafter carrying out data communications between the vehicle telematics unit and call center during the data communication session.
    Type: Grant
    Filed: October 11, 2010
    Date of Patent: December 29, 2015
    Assignee: General Motors LLC
    Inventors: Sethu K. Madhavan, Cem U. Saraydar, Andrew J. Macdonald, Ki Hak Yi, Iqbal M. Surti
  • Patent number: 8259840
    Abstract: A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel using a vocoder that operates in different modes depending upon characteristics of the inputted signal it receives. To prepare the digital data for transmission, one or more carrier signals are encoded with the digital data using one of a number of modulation schemes that utilize differential phase shift keying to give the modulated carrier signal certain periodicity and energy characteristics that allow it to be transmitted by the vocoder at full rate. The modulation schemes include DPSK using either a single or multiple frequency carriers, combined FSK-DPSK modulation, combined ASK-DPSK, PSK with a phase tracker in the demodulator, as well as continuous signal modulation (ASK or FSK) with inserted discontinuities that can be independent of the digital data.
    Type: Grant
    Filed: December 31, 2007
    Date of Patent: September 4, 2012
    Assignee: General Motors LLC
    Inventors: Elizabeth Chesnutt, Jijun Yin, Sethu K. Madhavan, Iqbal M. Surti
  • Patent number: 8194526
    Abstract: A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel of the communications network. Digital data is encoded into DBPSK data using differential binary phase shift keying encoding. The DBPSK data is then sent across the cellular network using a vocoder having a linear predictive or other speech compression codec. At the receiving end, the DBPSK data is demodulated back into the original digital data. This approach permits data communication via a CDMA, GSM, or other type of voice traffic channel at a low bit error rate.
    Type: Grant
    Filed: October 24, 2005
    Date of Patent: June 5, 2012
    Assignee: General Motors LLC
    Inventors: Sethu K. Madhavan, Iqbal M. Surti, Jijun Yin
  • Publication number: 20110249714
    Abstract: A system and method of communicating data between a vehicle and call center via a voice channel of a wireless communication system. The method carried out by the system includes the steps of: establishing a voice channel connection between a vehicle telematics unit and call center via a wireless cellular network; generating a modem signaling carrier comprising a prefix followed by a single frequency tone; sending the modem signaling carrier over the voice channel connection using an EVRC-B vocoder; establishing a data communication session over the voice channel connection in response to the modem signaling carrier; and thereafter carrying out data communications between the vehicle telematics unit and call center during the data communication session.
    Type: Application
    Filed: October 11, 2010
    Publication date: October 13, 2011
    Applicants: GM GLOBAL TECHNOLOGY OPERATIONS, INC., GENERAL MOTORS LLC.
    Inventors: Sethu K. Madhavan, Cem U. Saraydar, Andrew J. MacDonald, Ki Hak Yi, Iqbal M. Surti
  • Publication number: 20080255828
    Abstract: A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel using a vocoder that operates in different modes depending upon characteristics of the inputted signal it receives. To prepare the digital data for transmission, one or more carrier signals are encoded with the digital data using one of a number of modulation schemes that utilize differential phase shift keying to give the modulated carrier signal certain periodicity and energy characteristics that allow it to be transmitted by the vocoder at full rate. The modulation schemes include DPSK using either a single or multiple frequency carriers, combined FSK-DPSK modulation, combined ASK-DPSK, PSK with a phase tracker in the demodulator, as well as continuous signal modulation (ASK or FSK) with inserted discontinuities that can be independent of the digital data.
    Type: Application
    Filed: December 31, 2007
    Publication date: October 16, 2008
    Applicant: GENERAL MOTORS CORPORATION
    Inventors: Elizabeth Chesnutt, Jijun Yin, Sethu K. Madhavan, Iqbal M. Surti