Patents by Inventor Raghavendra S. Prabhu
Raghavendra S. Prabhu 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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Publication number: 20240040297Abstract: A method performed by an in-ear headphone. Coupled to the in-ear headphone is a first ear tip that is inserted into an ear canal of a user. The method obtains an audio signal from an audio source device paired with the in-ear headphone and uses the signal to drive a speaker of the headphone to output a sound into the ear canal. The method obtains a microphone signal that is responsive to the outputted sound. The method notifies the user to replace the first ear tip with a second ear tip in response to a parameter associated with the microphone signal being less than a threshold.Type: ApplicationFiled: June 30, 2023Publication date: February 1, 2024Inventors: Esge B. Andersen, Andrew E. Greenwood, Tom-Davy W. Saux, Baptiste P. Paquier, Hanchi Chen, Raghavendra S. Prabhu
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Patent number: 11722809Abstract: A method performed by an in-ear headphone. Coupled to the in-ear headphone is a first ear tip that is inserted into an ear canal of a user. The method obtains an audio signal from an audio source device paired with the in-ear headphone and uses the signal to drive a speaker of the headphone to output a sound into the ear canal. The method obtains a microphone signal that is responsive to the outputted sound. The method notifies the user to replace the first ear tip with a second ear tip in response to a parameter associated with the microphone signal being less than a threshold.Type: GrantFiled: August 29, 2022Date of Patent: August 8, 2023Assignee: Apple Inc.Inventors: Esge B. Andersen, Andrew E. Greenwood, Tom-Davy W. Saux, Baptiste P. Paquier, Hanchi Chen, Raghavendra S. Prabhu
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Publication number: 20230015418Abstract: A method performed by an in-ear headphone. Coupled to the in-ear headphone is a first ear tip that is inserted into an ear canal of a user. The method obtains an audio signal from an audio source device paired with the in-ear headphone and uses the signal to drive a speaker of the headphone to output a sound into the ear canal. The method obtains a microphone signal that is responsive to the outputted sound. The method notifies the user to replace the first ear tip with a second ear tip in response to a parameter associated with the microphone signal being less than a threshold.Type: ApplicationFiled: August 29, 2022Publication date: January 19, 2023Inventors: Esge B. Andersen, Andrew E. Greenwood, Tom-Davy W. Saux, Baptiste P. Paquier, Hanchi Chen, Raghavendra S. Prabhu
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Patent number: 11470413Abstract: A method performed by an in-ear headphone. Coupled to the in-ear headphone is a first ear tip that is inserted into an ear canal of a user. The method obtains an audio signal from an audio source device paired with the in-ear headphone and uses the signal to drive a speaker of the headphone to output a sound into the ear canal. The method obtains a microphone signal that is responsive to the outputted sound. The method notifies the user to replace the first ear tip with a second ear tip in response to a parameter associated with the microphone signal being less than a threshold.Type: GrantFiled: July 1, 2020Date of Patent: October 11, 2022Assignee: APPLE INC.Inventors: Esge B. Andersen, Andrew E. Greenwood, Tom-Davy W. Saux, Baptiste P. Paquier, Hanchi Chen, Raghavendra S. Prabhu
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Publication number: 20210014597Abstract: A method performed by an in-ear headphone. Coupled to the in-ear headphone is a first ear tip that is inserted into an ear canal of a user. The method obtains an audio signal from an audio source device paired with the in-ear headphone and uses the signal to drive a speaker of the headphone to output a sound into the ear canal. The method obtains a microphone signal that is responsive to the outputted sound. The method notifies the user to replace the first ear tip with a second ear tip in response to a parameter associated with the microphone signal being less than a threshold.Type: ApplicationFiled: July 1, 2020Publication date: January 14, 2021Inventors: Esge B. Andersen, Andrew E. Greenwood, Tom-Davy W. Saux, Baptiste P. Paquier, Hanchi Chen, Raghavendra S. Prabhu
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Patent number: 8515335Abstract: Cognitive anti-jam receiver systems and associated methods are provided. The systems and methods may include a signal analysis module that processes a baseband signal to determine one or more signal characteristics of the baseband signal, the baseband signal comprising at least a desired signal; a cognitive decision unit that receives the one or more signal characteristics from the signal analysis module, and generates at least one first adaptive parameter; and at least one anti-jam processing module that processes the baseband signal to generate a modified signal that reduces an impact of at least one jammer signal on a quality of reception of the desired signal from the baseband signal, where processing by the at least one anti-jam processing module may be based at least in part on the received at least one first adaptive parameter from the cognitive decision unit.Type: GrantFiled: November 30, 2009Date of Patent: August 20, 2013Assignee: The Aerospace CorporationInventors: Philip Anthony Dafesh, Raghavendra S. Prabhu, Esteban Luis Valles
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Publication number: 20110128178Abstract: Cognitive anti-jam receiver systems and associated methods are provided. The systems and methods may include a signal analysis module that processes a baseband signal to determine one or more signal characteristics of the baseband signal, the baseband signal comprising at least a desired signal; a cognitive decision unit that receives the one or more signal characteristics from the signal analysis module, and generates at least one first adaptive parameter; and at least one anti-jam processing module that processes the baseband signal to generate a modified signal that reduces an impact of at least one jammer signal on a quality of reception of the desired signal from the baseband signal, where processing by the at least one anti-jam processing module may be based at least in part on the received at least one first adaptive parameter from the cognitive decision unit.Type: ApplicationFiled: November 30, 2009Publication date: June 2, 2011Applicant: THE AEROSPACE CORPORATIONInventors: PHILIP ANTHONY DAFESH, RAGHAVENDRA S. PRABHU, ESTEBAN LUIS VALLES
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Patent number: 7003093Abstract: Disclosed is an integrated tone detection processor for discriminating between tone and voice signals and determining the tones. The tone detection processor performs Automatic Gain Control (AGC) to normalize the power of the tone or voice signal. Further, the energy of the tone or voice signals are determined at specific frequencies utilizing a Goertzel Filter process. The tone detection processor determines whether or not a tone is present, and if a tone exists, determines the type of tone. Based upon determining the two maximum energy levels of the Goertzel filtered tone, whether the tone is a single tone, dual tone, silence, or other (e.g. speech) can be discriminated. The tone can then be identified by a user-defined dictionary of tones. Based upon various ON and OFF cadence checks in combination with the use of TONE ON and TONE OFF counters, tones can be declared.Type: GrantFiled: August 23, 2001Date of Patent: February 21, 2006Assignee: Intel CorporationInventors: Raghavendra S. Prabhu, Adam Strauss, Stan Hsieh, Zhen Zhu, Anurag Bist
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Patent number: 6738358Abstract: A network echo canceller for integrated telecommunications processing. The network echo canceller processes echoes in multiple communication channels over a packet network. The network echo canceller adapts a least means squared finite impulse response filter to each communication channel in order to estimate an echo therein. The echo estimation is subtracted from signals that are being sent over each communication channel. The echo canceller includes a residual error suppressor to suppress non-linear sources of echo when desired. The echo canceller includes a double talk detector to inhibit filter adaptation during double talk. The network echo canceller is programmable into a digital signal processor and can be flexibly controlled through messaging.Type: GrantFiled: September 6, 2001Date of Patent: May 18, 2004Assignee: Intel CorporationInventors: Anurag Bist, Stan Hsieh, Raghavendra S. Prabhu, Zhen Zhu, Adam Strauss
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Publication number: 20020116186Abstract: Disclosed is an integrated voice activation detector for detecting whether voice is present. In one embodiment, the integrated voice activation detector includes a semiconductor integrated circuit having at least one signal processing unit to perform voice detection and a storage device to store signal processing instructions for execution by the at least one signal processing unit to: detect whether noise is present to determine whether a noise flag should be set, detect a predetermined number of zero crossings to determine whether a zero crossing flag should be set, detect whether a threshold amount of energy is present to determine whether an energy flag should be set, and detect whether instantaneous energy is present to determine whether an instantaneous energy flag should be set. Utilizing a combination of the noise, zero crossing, energy, and instantaneous energy flags the integrated voice activation detector determines whether voice is present.Type: ApplicationFiled: August 23, 2001Publication date: August 22, 2002Inventors: Adam Strauss, Anurag Bist, Stan Hsieh, Zhen Zhu, Raghavendra S. Prabhu
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Publication number: 20020076034Abstract: Disclosed is an integrated tone detection processor for discriminating between tone and voice signals and determining the tones. The tone detection processor performs Automatic Gain Control (AGC) to normalize the power of the tone or voice signal. Further, the energy of the tone or voice signals are determined at specific frequencies utilizing a Goertzel Filter process. The tone detection processor determines whether or not a tone is present, and if a tone exists, determines the type of tone. Based upon determining the two maximum energy levels of the Goertzel filtered tone, whether the tone is a single tone, dual tone, silence, or other (e.g. speech) can be discriminated. The tone can then be identified by a user-defined dictionary of tones. Based upon various ON and OFF cadence checks in combination with the use of TONE ON and TONE OFF counters, tones can be declared.Type: ApplicationFiled: August 23, 2001Publication date: June 20, 2002Inventors: Raghavendra S. Prabhu, Adam Strauss, Stan Hsieh, Zhen Zhu, Anurag Bist
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Publication number: 20020064139Abstract: A network echo canceller for integrated telecommunications processing. The network echo canceller processes echoes in multiple communication channels over a packet network. The network echo canceller adapts a least means squared finite impulse response filter to each communication channel in order to estimate an echo therein. The echo estimation is subtracted from signals that are being sent over each communication channel. The echo canceller includes a residual error suppressor to suppress non-linear sources of echo when desired. The echo canceller includes a double talk detector to inhibit filter adaptation during double talk. The network echo canceller is programmable into a digital signal processor and can be flexibly controlled through messaging.Type: ApplicationFiled: September 6, 2001Publication date: May 30, 2002Inventors: Anurag Bist, Stan Hsieh, Raghavendra S. Prabhu, Zhen Zhu, Adam Strauss