1
You Zhang, Jeffery J Faneuff, William Hidden, James T Hotary, Steven C Lee, Vasu Iyengar: Automobile speech-recognition interface. Bose Corporation, November 2, 2010: US07826945 (220 worldwide citation)

An automotive system provides an integrated user interface for control and communication functions in an automobile or other type of vehicle. The user interface supports voice enabled interactions, as well as other modes of interaction, such as manual interactions using controls such as dashboard or ...


2
Vasu Iyengar, Rafi Rabipour, Paul Mermelstein, Brian R Shelton: Speech bandwidth extension method and apparatus. Northern Telecom, Dallas F Smith, John A Granchelli, October 3, 1995: US05455888 (184 worldwide citation)

A speech bandwidth extension method and apparatus analyzes narrowband speech sampled at 8 kHz using LPC analysis to determine its spectral shape and inverse filtering to extract its excitation signal. The excitation signal is interpolated to a sampling rate of 16 kHz and analyzed for pitch control a ...


3
Ronald Eldon Crochiere, Vasu Iyengar: Echo canceller with adaptive and non-adaptive filters. Lucent Technologies, David Sigmond, David L Smith, September 2, 1997: US05664011 (38 worldwide citation)

An echo canceller includes receive and send paths each having an input and output port, a first non-adaptive filter with first filter coefficients for generating a first replica signal in response to a receive input signal, a second adaptive filter with second filter coefficients for generating a se ...


4
Vasu Iyengar, Fatos Myftari, Sorin V Dusan, Aram M Lindahl: Microphone partial occlusion detector. Apple, Blakely Sokoloff Taylor & Zafman, October 11, 2016: US09467779 (35 worldwide citation)

Digital signal processing for microphone partial occlusion detection is described. In one embodiment, an electronic system for audio noise processing and for noise reduction, using a plurality of microphones, includes a first noise estimator to process a first audio signal from a first one of the mi ...


5
Vasu Iyengar: Echo canceller system with shared coefficient memory. Lucent Technologies, David Sigmond, David L Smith, September 2, 1997: US05663955 (22 worldwide citation)

An echo canceller system includes first and second echo cancellers. Each echo canceller includes a foreground filter and an adaptive background filter, with the foreground filter providing the actual echo cancellation and the background filter updating the foreground filter. The echo canceller syste ...


6
Vasu Iyengar, James Charles Popa, Richard M Ubowski: Handset access of message in digital cordless telephone. Agere Systems, William H Bollman, April 8, 2003: US06546241 (22 worldwide citation)

In one embodiment according to the invention, a digital cordless telephone includes a base unit adapted to couple to a telephone network, to transmit an outgoing message to an incoming caller, to store a digital message from the incoming caller, and to transmit and receive digital samples over an RF ...


7
Vasu Iyengar, Syed S Ali: Silence compression for recorded voice messages. Lucent Technologies, April 11, 2000: US06049765 (21 worldwide citation)

A silence compression system that improves data compression in a digital speech storage device, such as a digital telephone answering machine, without undue clipping of voice signals. Instead of employing only real-time compression, the inventive silence system analyzes and compresses or re-compress ...


8
Vasu Iyengar, James Charles Popa: Communication system based on echo canceler tap profile. Lucent Technologies, Darby & Darby, May 7, 2002: US06385176 (17 worldwide citation)

A controller and a method for controlling the amount of loss in signal paths of a communication system are disclosed. The method includes sampling the impulse response of an echo cancelling circuit, detecting an abnormal signal condition by comparing the impulse response to a reference, and insertin ...


9
Luke C Walters, Vasu Iyengar, Martin David Ring: Rejecting noise with paired microphones. Bose Corporation, December 31, 2013: US08620650 (14 worldwide citation)

A system for combining signals includes a first microphone generating a first input signal having a first voice component and a first noise component, a second microphone generating a second input signal having a second voice component and a second noise component, a mixing circuit, and an adaptive ...


10
Joseph M Cannon, James A Johanson, Vasu Iyengar: Speech coding selection based on call related information. Lucent Technologies, William H Bollman, September 25, 2001: US06295340 (14 worldwide citation)

A variable voice compression device and method in a voice messaging system is provided. The device includes a call related information/coding table or database which contains associations between call related information regarding desired calling parties, and selected coding techniques and effective ...