Patents by Inventor Vinod Prakash

Vinod Prakash 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).

  • ECHO PRESENCE DETERMINATION IN VOICE CONVERSATIONS
    Publication number: 20100177884
    Abstract: Presence of echo in a conversation is determined through a search performed in the sub-band domain using independent short length adaptive filters across a range of sub-band and maximum expected echo delay values. The adaptive filters attempt to predict and cancel the echo in the microphone signal based on the content in the speaker signal. If substantial cancelation is achieved in any of the sub-band filters, echo presence in the microphone signal is determined.
    Type: Application
    Filed: January 13, 2009
    Publication date: July 15, 2010
    Applicant: Microsoft Corporation
    Inventors: Vinod Prakash, Chao He
  • Method, system and apparatus for allocating bits in perceptual audio coders
    Patent number: 7725313
    Abstract: A non-iterative and computationally efficient bit allocation technique for perceptual audio coders employing uniform quantization schemes. This is achieved by computing a target MNR for all critical bands in a frame using a target bit rate and associated SMRs. Associated SNRs are then computed for the critical bands using the computed target MNR and the associated SMRs. Bits are then allocated to the critical bands based on the computed associated SNRs.
    Type: Grant
    Filed: September 13, 2004
    Date of Patent: May 25, 2010
    Assignee: Ittiam Systems (P) Ltd.
    Inventors: Preethi Konda, Vinod Prakash
  • System, method, and apparatus for fast quantization in perceptual audio coders
    Patent number: 7650277
    Abstract: A technique to encode an audio signal based on a perceptual model. In one example embodiment, this is accomplished by shaping quantization noise in the spectral lines on a band-by-band basis using their local gains. The noise shaped spectral lines are then fitted within a predetermined bit rate to form an encoded bit stream.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: January 19, 2010
    Assignee: Ittiam Systems (P) Ltd.
    Inventors: Vinod Prakash, Ashok I Magadum
  • Systems and methods for low bit rate audio coders
    Patent number: 7640157
    Abstract: A technique to enhance audio quality of a quantized audio signal when a perceptual audio coder is operating at low bit rates. The perceptual audio coder uses a modified two-loop quantization technique that maintains audio quality at medium to high bit rates while eliminating artifacts at low bit rates. The perceptual audio coder saves vanishing bands by stealing bits from surviving bands to reduce artifacts at low bit rates.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: December 29, 2009
    Assignee: Ittiam Systems (P) Ltd.
    Inventors: Vinod Prakash, Sarat Chandra Vadapalli, Anil Kumar, Preethi Konda
  • ACCOUSTIC ECHO CANCELLATION AND ADAPTIVE FILTERS
    Publication number: 20090316924
    Abstract: In one embodiment, a two-way telecommunication device may perform acoustic echo cancellation on incoming signals. An audio decoding module may produce an audio render signal. An audio capture interface may receive an audio capture signal. A short length adaptive filter may determine a time delay between the audio render signal and the audio capture signal by adaptively predicting a sub-band of the audio capture signal using a corresponding sub-band of the audio render signal.
    Type: Application
    Filed: June 20, 2008
    Publication date: December 24, 2009
    Applicant: MICROSOFT CORPORATION
    Inventors: Vinod Prakash, Chao He
  • TIMESTAMP QUALITY ASSESSMENT FOR ASSURING ACOUSTIC ECHO CANCELLER OPERABILITY
    Publication number: 20090316881
    Abstract: A voice communication end device provides echo reduction when operating in a full duplex mode using acoustic echo cancellation, which includes periodic audio queue adjustments to account for drift. The end device performs a quality assessment by calculating consistency statistics for the queue adjustments to determine whether acoustic echo cancellation would be ineffective, and if so falls back to a half duplex mode using voice switching.
    Type: Application
    Filed: June 20, 2008
    Publication date: December 24, 2009
    Applicant: Microsoft Corporation
    Inventors: Vinod Prakash, Chao He
  • Method, system and apparatus for allocating bits in perceptual audio coders
    Publication number: 20060069555
    Abstract: A non-iterative and computationally efficient bit allocation technique for perceptual audio coders employing uniform quantization schemes. This is achieved by computing a target MNR for all critical bands in a frame using a target bit rate and associated SMRs. Associated SNRs are then computed for the critical bands using the computed target MNR and the associated SMRs. Bits are then allocated to the critical bands based on the computed associated SNRs.
    Type: Application
    Filed: September 13, 2004
    Publication date: March 30, 2006
    Inventors: Preethi Konda, Vinod Prakash
  • Systems and methods for low bit rate audio coders
    Publication number: 20050071027
    Abstract: A technique to enhance audio quality of a quantized audio signal when a perceptual audio coder is operating at low bit rates. The perceptual audio coder uses a modified two-loop quantization technique that maintains audio quality at medium to high bit rates while eliminating artifacts at low bit rates. The perceptual audio coder saves vanishing bands by stealing bits from surviving bands to reduce artifacts at low bit rates.
    Type: Application
    Filed: February 6, 2004
    Publication date: March 31, 2005
    Inventors: Vinod Prakash, Sarat Vadapalli, Anil Kumar, Preethi Konda
  • System, method, and apparatus for fast quantization in perceptual audio coders
    Publication number: 20040158456
    Abstract: A technique to encode an audio signal based on a perceptual model. In one example embodiment, this is accomplished by shaping quantization noise in the spectral lines on a band-by-band basis using their local gains. The noise shaped spectral lines are then fitted within a predetermined bit rate to form an encoded bit stream.
    Type: Application
    Filed: September 25, 2003
    Publication date: August 12, 2004
    Inventors: Vinod Prakash, Ashok I. Magadum