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Subrahmanyam Y Kunapuli

from Fremont, CA
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Connected to:
Bradley A Kunas, 57Edward A Kunas, 41Gordon E Kunaschk, 86Matthew Kunasek, 33Shelley A Kunasek, 45Thomas F Kunasek, 92Brian J Kunath, 57Charles E Kunath, 68Donald L Kunath, 63Frances G Kunath, 69

Subrahmanyam Kunapuli Phones & Addresses

  • 5089 Ridgewood Dr, Fremont, CA 94555 (510) 795-1856
  • 5089 Ridgewood Dr, Fremont, CA 94555

Work

Position: Professional/Technical

Education

Degree: High school graduate or higher

Resumes

Resumes

Subrahmanyam Kunapuli Photo 1

Audio/Dsp Engineering Lead - Telepresence/Video Conferencing At Cisco

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Location:
San Francisco Bay Area
Industry:
Computer Networking
Experience:
Cisco (Public Company; CSCO; Computer Networking industry): Audio/DSP Engineering Lead - Telepresence/Video Conferencing,  (February 2003-Present) Lucent Technologies (Public Company; 10,001+ employees; LU; Telecommunications industry): Principal DSP Engineer, &nb...
Subrahmanyam Kunapuli Photo 2

Subrahmanyam Kunapuli

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Publications

Us Patents

System And Method For Muting Audio Associated With A Source

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US Patent:
20130044893, Feb 21, 2013
Filed:
Aug 16, 2011
Appl. No.:
13/136990
Inventors:
J. William Mauchly - Berwyn PA, US
Subrahmanyam V. Kunapuli - Fremont CA, US
Fei Yang - San Jose CA, US
Assignee:
CISCO TECHNOLOGY, INC. - San Jose CA
International Classification:
H04R 3/00
US Classification:
381 92
Abstract:
In one embodiment, a method includes receiving audio at a plurality of microphones, identifying a sound source to be muted, processing the audio to remove sound received from the sound source at each of the microphones, and transmitting the processed audio. An apparatus is also disclosed.

Acoustic Echo Cancellation For Audio System With Bring Your Own Devices (Byod)

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US Patent:
20160205262, Jul 14, 2016
Filed:
Mar 18, 2016
Appl. No.:
15/073799
Inventors:
- San Jose CA, US
Subrahmanyam Venkata Kunapuli - Fremont CA, US
Fei Yang - San Jose CA, US
Tor A. Sundsbarm - San Jose CA, US
International Classification:
H04M 9/08
G10K 11/178
H04R 3/02
H04M 3/56
H04R 3/00
Abstract:
A controller for the conference session generates a speaker signal for speakers in a conference room. The controller correlates the speaker signal with network timing information and generates speaker timing information. The controller transmits the correlated speaker signal and timing information to a mobile device participating in the conference session. The mobile device generates an echo cancelled microphone signal from a microphone of the mobile device, and transmits the echo cancelled signal back to the controller. The controller also receives array microphone signals associated with an array of microphones at known positions in the room. The controller estimates a relative location of the mobile device within the conference room. The controller dynamically selects as audio output corresponding to the mobile device location either the echo cancelled microphone signal from the mobile device or an echo cancelled array microphone signal associated with the relative location of the mobile device.

Muting A Sound Source With An Array Of Microphones

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US Patent:
20150201278, Jul 16, 2015
Filed:
Jan 14, 2014
Appl. No.:
14/154975
Inventors:
- San Jose CA, US
Subrahmanyam Kunapuli - Fremont CA, US
Fei Yang - San Jose CA, US
Tor Sundsbarm - San Jose CA, US
Assignee:
CISCO TECHNOLOGY, INC. - San Jose CA
International Classification:
H04R 3/00
H04R 3/04
Abstract:
A processing system can include tracking microphone array(s), audio-tracking circuitry configured to detect a location of audio sources from audio signals from the array(s), and processing circuitry. The processing circuitry can be configured to: identify a first microphone that has a strongest signal strength; estimate a location of an active speaker based on at least an output of the audio-tracking circuitry; determine whether a second microphone for the active speaker is affected by an acoustic obstacle based on the location of the active speaker and a location of the first microphone that has the strongest signal strength; estimate attenuation for microphones based on a comparison of actual signal strengths of the microphones with estimated signal strengths of the microphones that are estimated based on microphone signals of the second microphone for the active speaker; and modify the attenuation based on an estimated location of the acoustic obstacle.

Whiteboard Activity Noise Detection System For Immersive Telepresence Systems

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US Patent:
20150156395, Jun 4, 2015
Filed:
Dec 4, 2013
Appl. No.:
14/096885
Inventors:
- San Jose CA, US
Subrahmanyam Venkata Kunapuli - Fremont CA, US
Fei Yang - San Jose CA, US
Tor Sundsbarm - San Jose CA, US
David Paul Wunsch Desrosiers - Los Gatos CA, US
David Michael Sanguinet - San Jose CA, US
Assignee:
Cisco Technology, Inc. - San Jose CA
International Classification:
H04N 5/232
Abstract:
In one embodiment, a method includes obtaining a first signal from a first microphone, and determining when the first signal is indicative of activity on a first surface. The method also includes controlling a camera to focus on the first surface when it is determined that the first signal indicates the activity on the first surface. In such an embodiment, the first microphone and the camera may be part of a collaboration system, and the first surface may be a surface of a whiteboard.

Acoustic Echo Cancellation For Microphone Array With Dynamically Changing Beam Forming

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US Patent:
20150063579, Mar 5, 2015
Filed:
Sep 5, 2013
Appl. No.:
14/018635
Inventors:
- San Jose CA, US
Subrahmanyam Venkata Kunapuli - Fremont CA, US
Fei Yang - San Jose CA, US
Xiangyu Bao - Campbell CA, US
Tor A. Sundsbarm - San Jose CA, US
Assignee:
Cisco Technology, Inc. - San Jose CA
International Classification:
G10K 11/16
US Classification:
381 66
Abstract:
Acoustic echo cancellation is improved by receiving a speaker signal that is used to produce audio in a room, and receiving audio signals that capture audio from an array of microphones in the room, including an acoustic echo from the speakers. To cancel the acoustic echo, one adaptive filter is associated with a corresponding subspace in the room. Each of the audio signals is assigned to at least one of the adaptive filters, and a set of coefficients is iteratively determined for each of the adaptive filters. The coefficients for an adaptive filter are determined by selecting each of the audio signals assigned to that adaptive filter and adapting the filter to remove an acoustic echo from each of the selected audio signals. At each iteration, a different audio signal is selected from the audio signals assigned to the adaptive filter in order to determine the set of coefficients.

Acoustic Echo Cancellation For Audio System With Bring Your Own Devices (Byod)

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US Patent:
20150050967, Feb 19, 2015
Filed:
Aug 15, 2013
Appl. No.:
13/967687
Inventors:
- San Jose CA, US
Subrahmanyam Venkata Kunapuli - Fremont CA, US
Fei Yang - San Jose CA, US
Tor A. Sundsbarm - San Jose CA, US
Assignee:
Cisco Technology, Inc - San Jose CA
International Classification:
H04M 9/08
H04M 3/56
US Classification:
455570
Abstract:
A controller for the conference session receives at least one audio signal to generate a speaker signal. The controller correlates the speaker signal with network timing information and generates speaker timing information. The controller transmits the correlated speaker signal and timing information to a mobile device participating in the conference session. The mobile device generates an echo cancelled microphone signal from a microphone of the mobile device, and transmits the echo cancelled signal back to the controller. The controller also receives array microphone signals associated with an array of microphones at known positions in the room. The controller removes acoustic echo from the array microphone signals, and estimates a relative location of the mobile device. The controller dynamically selects as audio output corresponding to the mobile device location either (a) the array microphone signal, or (b) the echo cancelled microphone signal from the mobile device.

System And Method For Clock Synchronization Of Acoustic Echo Canceller (Aec) With Different Sampling Clocks For Speakers And Microphones

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US Patent:
20140112466, Apr 24, 2014
Filed:
Oct 23, 2012
Appl. No.:
13/657908
Inventors:
- San Jose CA, US
J. William Mauchly - Berwyn PA, US
Subrahmanyam Kunapuli - Fremont CA, US
Xiangyu Bao - Campbell CA, US
Assignee:
CISCO TECHNOLOGY, INC. - San Jose CA
International Classification:
H04M 9/08
H04B 15/00
US Classification:
37940606, 37940601
Abstract:
Clock synchronization for an acoustic echo canceller (AEC) with a speaker and a microphone connected over a digital link may be provided. A clock difference may be estimated by analyzing the speaker signal and the microphone signal in the digital domain. The clock synchronization may be combined in both hardware and software. This synchronization may be performed in two stages, first with coarse synchronization in hardware, then fine synchronization in software with, for example, a re-sampler.
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Subrahmanyam Y Kunapuli from Fremont, CA Get Report