Patents by Inventor Arasanipalai K. Ananthapadmanabhan
Arasanipalai K. Ananthapadmanabhan 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).
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Patent number: 8660840Abstract: A method and apparatus for predictively quantizing voiced speech includes a parameter generator and a quantizer. The parameter generator is configured to extract parameters from frames of predictive speech such as voiced speech, and to transform the extracted information to a frequency-domain representation. The quantizer is configured to subtract a weighted sum of the parameters for previous frames from the parameter for the current frame. The quantizer is configured to quantize the difference value. A prototype extractor may be added to first extract a pitch period prototype to be processed by the parameter generator.Type: GrantFiled: August 12, 2008Date of Patent: February 25, 2014Assignee: QUALCOMM IncorporatedInventors: Arasanipalai K. Ananthapadmanabhan, Sarath Manjunath, Pengjun Huang, Eddie-Lun Tik Choy, Andrew P. Dejaco
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Patent number: 8358617Abstract: Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.Type: GrantFiled: July 10, 2009Date of Patent: January 22, 2013Assignee: QUALCOMM IncorporatedInventors: Khaled H. El-Maleh, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco
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Patent number: 8243695Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.Type: GrantFiled: August 7, 2009Date of Patent: August 14, 2012Assignee: QUALCOMM IncorporatedInventors: Khaled H. El-Maleh, Eddie-Lun Tik Choy, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco, Pengjun Huang
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Publication number: 20100036668Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.Type: ApplicationFiled: August 7, 2009Publication date: February 11, 2010Applicant: QUALCOMM IncorporatedInventors: Khaled H. El-Maleh, Eddie-Lun Tik Choy, Arasanipalai K. Ananthapadmanabhan, Andrew P. DaJaco, Pengjun Huang
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Publication number: 20090281796Abstract: Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.Type: ApplicationFiled: July 10, 2009Publication date: November 12, 2009Applicant: QUALCOMM IncorporatedInventors: Khaled H. El-Maleh, Arasanipalai K. Ananthapadmanabhan, Andrew P. Dejaco
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Patent number: 7590096Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.Type: GrantFiled: September 9, 2004Date of Patent: September 15, 2009Assignee: QUALCOMM IncorporatedInventors: Khaled H. El-Maleh, Eddie-Lun Tik Choy, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco, Pengjun Huang
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Patent number: 7577563Abstract: Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.Type: GrantFiled: September 22, 2006Date of Patent: August 18, 2009Assignee: Qualcomm IncorporatedInventors: Khaled H. El-Maleh, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco
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Publication number: 20080312917Abstract: A method and apparatus for predictively quantizing voiced speech includes a parameter generator and a quantizer. The parameter generator is configured to extract parameters from frames of predictive speech such as voiced speech, and to transform the extracted information to a frequency-domain representation. The quantizer is configured to subtract a weighted sum of the parameters for previous frames from the parameter for the current frame. The quantizer is configured to quantize the difference value. A prototype extractor may be added to first extract a pitch period prototype to be processed by the parameter generator.Type: ApplicationFiled: August 12, 2008Publication date: December 18, 2008Applicant: QUALCOMM IncorporatedInventors: Arasanipalai K. Ananthapadmanabhan, Sharath Manjunath, Pengjun Huang, Eddie-Lun Tik Choy, Andrew P. Dejaco
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Patent number: 7426466Abstract: A method and apparatus for predictively quantizing voiced speech includes a parameter generator and a quantizer. The parameter generator is configured to extract parameters from frames of predictive speech such as voiced speech, and to transform the extracted information to a frequency-domain representation. The quantizer is configured to subtract a weighted sum of the parameters for previous frames from the parameter for the current frame. The quantizer is configured to quantize the difference value. A prototype extractor may be added to first extract a pitch period prototype to be processed by the parameter generator.Type: GrantFiled: July 22, 2004Date of Patent: September 16, 2008Assignee: QUALCOMM IncorporatedInventors: Arasanipalai K. Ananthapadmanabhan, Sharath Manjunath, Pengjun Huang, Eddie-Lun Tik Choy, Andrew P. DeJaco
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Patent number: 7113522Abstract: Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.Type: GrantFiled: January 24, 2001Date of Patent: September 26, 2006Assignee: QUALCOMM, IncorporatedInventors: Khaled H. El-Maleh, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco
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Patent number: 7061934Abstract: The disclosed embodiments provide a method and apparatus for interoperability between CTX and DTX communications systems during transmissions of silence or background noise [FIG. 2]. Continuous eighth rate encoded noise frames are translated to discontinuous SID frames for transmission to DTX systems (402–410). Discontinuous SID frames are translated to continuous eighth rate encoded noise frames for decoding by a CTX system (602–606).Type: GrantFiled: July 17, 2003Date of Patent: June 13, 2006Assignee: Qualcomm IncorporatedInventors: Khaled El-Maleh, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco
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Publication number: 20040260542Abstract: A method and apparatus for predictively quantizing voiced speech includes a parameter generator and a quantizer. The parameter generator is configured to extract parameters from frames of predictive speech such as voiced speech, and to transform the extracted information to a frequency-domain representation. The quantizer is configured to subtract a weighted sum of the parameters for previous frames from the parameter for the current frame. The quantizer is configured to quantize the difference value. A prototype extractor may be added to first extract a pitch period prototype to be processed by the parameter generator.Type: ApplicationFiled: July 22, 2004Publication date: December 23, 2004Inventors: Arasanipalai K. Ananthapadmanabhan, Sharath Manjunath, Pengjun Huang, Eddie-Lun Tik Choy, Andrew P. DeJaco
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Patent number: 6804218Abstract: A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from causing audible artifacts such as screeches or beeps. The disclosed system and method detects frames with incorrectly determined data rates and performs frame erasure processing and/or memory state clean up to prevent propagation of distortion across multiple frames. Frames with incorrectly determined data rates are detected by checking illegal rate transitions, reserved bits, validating unused filter type bit combinations and analyzing relationships between fixed code-book gains and linear prediction coefficient gains.Type: GrantFiled: December 4, 2000Date of Patent: October 12, 2004Assignee: Qualcomm IncorporatedInventors: Khaled H. El-Maleh, Eddie-Lun Tik Choy, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco, Pengjun Huang
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Publication number: 20040133419Abstract: The disclosed embodiments provide a method and apparatus for interoperability between CTX and DTX communications systems during transmissions of silence or background noise [FIG. 2]. Continuous eighth rate encoded noise frames are translated to discontinuous SID frames for transmission to DTX systems (402-410). Discontinuous SID frames are translated to continuous eighth rate encoded noise frames for decoding by a CTX system (602-606).Type: ApplicationFiled: July 17, 2003Publication date: July 8, 2004Inventors: Khaled El-Maleh, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco
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Patent number: 6754624Abstract: A method and apparatus for enhancing coding efficiency by reducing illegal or other undesirable packet generation while encoding a signal. The probability of generating illegal or other undesirable packets while encoding a signal is reduced by first analyzing a history of the frequency of codebook values selected while quantizing speech parameters. Codebook entries are then reordered so that the index/indices that create illegal or other undesirable packets contain the least frequently used entry/entries. Reordering multiple codebooks for various parameters further reduces the probability that an illegal or other undesirable packet will be created during signal encoding. The method and apparatus may be applied to reduce the probability of generating illegal null traffic channel data packets while encoding eighth rate speech.Type: GrantFiled: February 13, 2001Date of Patent: June 22, 2004Assignee: Qualcomm, Inc.Inventors: Eddie-Lun Tik Choy, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco
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Patent number: 6631139Abstract: The disclosed embodiments provide a method and apparatus for interoperability between CTX and DTX communications systems during transmissions of silence or background noise. Continuous eighth rate encoded noise frames are translated to discontinuous SID frames for transmission to DTX systems. Discontinuous SID frames are translated to continuous eighth rate encoded noise frames for decoding by a CTX system.Type: GrantFiled: January 31, 2001Date of Patent: October 7, 2003Assignee: Qualcomm IncorporatedInventors: Khaled El-Maleh, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco
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Publication number: 20030012221Abstract: Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical wideband-to-narrowband conversion method is the elimination of frequencies above 3400 Hz using a low pass filter and a down sampler. However, this method produces a muffled speech sound since the resulting narrowband signal has a flat frequency response. Methods and apparatus are presented herein to enhance the acoustic quality of a wideband-to-narrowband converted signal. A bandwidth switching filter is used to emphasize a mid-range frequency portion of the wideband signal so that the resulting narrowband signal has a non-flat frequency spectrum.Type: ApplicationFiled: January 24, 2001Publication date: January 16, 2003Inventors: Khaled H. El-Maleh, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco
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Patent number: 6438518Abstract: A method and apparatus for using coding scheme selection patterns in a predictive speech coder to reduce sensitivity to frame error conditions includes a speech coder configured to select from among various predictive coding modes. After a predefined number of speech frames have been predictively coded, the speech coder codes one frame with a nonpredictive coding mode or a mildly predictive coding mode. The predefined number of frames can be determined in advance from the subjective standpoint of a listener. The predefined number of frames may be varied periodically. An average coding bit rate may be maintained for the speech coder by ensuring that an average coding bit rate is maintained for each successive pattern, or group, of predictively coded speech frames including at least one nonpredictively coded or mildly predictively coded speech frame.Type: GrantFiled: October 28, 1999Date of Patent: August 20, 2002Assignee: Qualcomm IncorporatedInventors: Sharath Manjunath, Andrew P. Dejaco, Arasanipalai K. Ananthapadmanabhan, Eddie Lun Tik Choy
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Publication number: 20020111804Abstract: A method and apparatus for enhancing coding efficiency by reducing illegal or other undesirable packet generation while encoding a signal. The probability of generating illegal or other undesirable packets while encoding a signal is reduced by first analyzing a history of the frequency of codebook values selected while quantizing speech parameters. Codebook entries are then reordered so that the index/indices that create illegal or other undesirable packets contain the least frequently used entry/entries. Reordering multiple codebooks for various parameters further reduces the probability, that an illegal or other undesirable packet will be created during signal encoding. The method and apparatus may be applied to reduce the probability of generating illegal null traffic channel data packets while encoding eighth rate speech.Type: ApplicationFiled: February 13, 2001Publication date: August 15, 2002Inventors: Eddie-Lun Tik Choy, Arasanipalai K. Ananthapadmanabhan, Andrew P. DeJaco
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Patent number: 6434519Abstract: A method and apparatus for identifying frequency bands to compute linear phase shifts between frame prototypes in a speech coder includes partitioning the frequency spectrum of a prototype of a frame by dividing the frequency spectrum into segments, assigning one or more bands to each segment, and establishing, for each segment, a set of bandwidths for the bands. The bandwidths may be fixed and uniformly distributed in any given segment. The bandwidths may be fixed and non-uniformly distributed in any segment. The bandwidths may be variable and non-uniformly distributed in any given segment.Type: GrantFiled: July 19, 1999Date of Patent: August 13, 2002Assignee: Qualcomm IncorporatedInventors: Sharath Manjunath, Andrew P. Dejaco, Arasanipalai K. Ananthapadmanabhan, Pengjun Huang, Eddie Lun Tik Choy