1
Leo Strawczynski, Bill W A Gage, Rafi Rabipour: Telecommunication network utilizing a quality of service protocol. Nortel Networks Corporation, March 14, 2000: US06038452 (195 worldwide citation)

The present invention provides novel systems and methods for improving the voice quality of wireless-to-wireless calls or wireless-to-fixed terminal calls. This disclosure describes methods and apparatuses to determine and control the quality of service objectives in a telecommunication network invo ...


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
H S Peter Yue, Rafi Rabipour: Methods and apparatus for noise conditioning in digital speech compression systems using linear predictive coding. Northern Telecom, C W Junkin, June 24, 1997: US05642464 (139 worldwide citation)

In methods and apparatus for processing a speech signals comprising a plurality of successive signal intervals, each signal interval containing no speech sounds is classified as a noise interval, and LPC coefficients are calculated for each noise interval based on the samples of that noise interval ...


4
Paul Mermelstein, Rafi Rabipour, William Navarro, Paul Coverdale: Method and apparatus for improving the voice quality of tandemed vocoders. Nortel Networks Corporation, Foley & Lardner, November 30, 1999: US05995923 (80 worldwide citation)

In recent years, the telecommunications industry has witnessed the proliferation of a variety of digital vocoders in order to meet bandwidth demands of different wireline and wireless communication systems. The rapid growth in the diversity of networks and the number of users of such networks is inc ...


5
Hermon Pon, Rafi Rabipour, Chung Cheung Chu: System for TDMA mobile-to-mobile VSELP codec bypass. Northern Telecom, Foley & Lardner, June 16, 1998: US05768308 (37 worldwide citation)

In a TDMA mobile-to-mobile connection, the end-to-end audio signal quality as well as system performance can be improved by providing digital signal processors the capability to automatically switch configuration such that each digital signal processor in a mobile-to-mobile communication connection ...


6
Rafi Rabipour, Girish Patel: Dynamic vocoder selection for storing and forwarding voice signals. Nortel Networks, March 26, 2002: US06363339 (35 worldwide citation)

In recent years, the telecommunications industry has witnessed the proliferation of a variety of digital vocoders in order to meet bandwidth demands of different wireline and wireless communication systems. The rapid growth in the diversity of networks and the number of users of such networks is inc ...


7
Rafi Rabipour, Paul Coverdale, Paxton Smith: Method and apparatus for packet-based media communication. Nortel Networks, February 28, 2006: US07006456 (29 worldwide citation)

A conference bridge is provided for managing a conference between media signal sources generating media data packets conveying encoded media information and encoding type information. The media signal sources, in order to enter a conference, generate link messages including respective supported enco ...


8
Leo Strawczynski, Bill W A Gage, Rafi Rabipour: Cellular communication network with vocoder sharing feature. Nortel Networks Corporation, October 24, 2000: US06138022 (28 worldwide citation)

The present invention provides a novel system and a method for improving the voice quality of wireless-to-wireless calls or wireless-to-fixed terminal calls, while permitting a more efficient utilization of network resources. In a first aspect, the invention provides a communication system including ...


9
Hermon Pon, Rafi Rabipour, Chung Cheung Chu: System for TDMA mobile-to-mobile VSELP CODEC bypass. Nortel Networks, Dennis R Haszko, February 6, 2001: US06185424 (23 worldwide citation)

In a TDMA mobile-to-mobile connection, the end-to-end audio signal quality as well as system performance can be improved by providing digital signal processors the capability to automatically switch configuration such that each digital signal processor in a mobile-to-mobile communication connection ...


10
Leo Strawczynski, Bill Gage, Rafi Rabipour: Telecommunication network utilizing an error control protocol. Nortel Networks, November 14, 2000: US06148422 (20 worldwide citation)

The present invention provides a system and a method for improving the voice quality of wireless-to-wireless calls. More specifically, the invention provides a method and an apparatus to add supplemental information for better error detection and correction of data packets. This feature allows the i ...