1
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 ...


2
Ahmad Jalali, Witold Krzymien, Paul Mermelstein: Medium access control scheme for data transmission on code division multiple access (CDMA) wireless systems. Northern Telecom, Finnegan Henderson Farabow Garrett & Dunner L, October 27, 1998: US05828662 (124 worldwide citation)

A synchronous discontinuous transmission medium access control (SDTX-MAC) method and apparatus for more efficiently using existing uplink channels by sharing these uplink channels between multiple terminals engaged in bursty data transmission. This is accomplished by assigning each mobile terminal a ...


3
Sofiène Affes, Henrik Hansen, Paul Mermelstein: Interference suppression in CDMA systems. Institut National de la Recherche Scientifique, Thomas Adams, December 13, 2005: US06975666 (81 worldwide citation)

A receiver of the present invention addresses the need for improved interference suppression without the number of transmissions by the power control system being increased, and, to this end, provides a receiver for a CDMA communications system which employs interference subspace rejection to tune a ...


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
Matthew Lennig, Paul Mermelstein, Vishwa N Gupta: Speech recognition. Northern Telecom, Foley & Lardner Schwartz Jeffery Schwaab Mack Blumenthal & Evans, September 11, 1990: US04956865 (58 worldwide citation)

In a speech recognizer, for recognizing unknown utterances in isolated-word speech or continuous speech, improved recognition accuracy is obtained by augmenting the usual spectral representation of the unknown utterance with a dynamic component. A corresponding dynamic component is provided in the t ...


6
Paul Mermelstein: Apparatus and method for coding speech signals by making use of voice/unvoiced characteristics of the speech signals. Nortel Networks, June 19, 2001: US06249758 (21 worldwide citation)

An audio signal encoding device is provided comprising an input for receiving a sub-frame of an audio signal, a voiced audio signal synthesis stage, an unvoiced audio signal synthesis stage, and a processing unit. The voiced audio signal synthesis stage is operative for producing a first synthetic a ...


7
Rafi Rabipour, Michael G Beyrouti, Paul Mermelstein: LPC-based DTMF receiver for secondary signalling. Northern Telecom, John E Mowle, August 1, 1989: US04853958 (15 worldwide citation)

A dual tone multi-frequency (DTMF) receiver for use in detecting digitally transmitted signals in the telephone industry. The receiver derives linear predictive coefficients for the digital signals in the data frame. This information is used to compute frequency response magnitudes at the DTMF frequ ...


8
Paul Mermelstein: Reducing search complexity for code-excited linear prediction (CELP) coding. Northern Telecom, Dallas F Smith, John A Granchelli, June 11, 1996: US05526464 (12 worldwide citation)

A code-excited linear prediction (CELP) coding method and code divide the residual signal into frequency bands. Codebooks provided for each band decrease in size with increasing band frequency. Reduction in codebook size with increasing frequency together with reduction in sampling rate with decreas ...


9
Paul Mermelstein: Apparatus and method for coding speech signals by making use of an adaptive codebook. Nortel Networks, February 5, 2002: US06345255 (9 worldwide citation)

An audio signal encoding device is provided including an input for receiving a sub-frame of an audio signal to be encoded, an adaptive codebook and a processing unit. The adaptive codebook stores at least one prior knowledge entry which includes a data element representative of characteristics of at ...


10
Paul Mermelstein: Nonlinear filter for noise suppression in linear prediction speech processing devices. Nortel Networks Corporation, April 18, 2000: US06052659 (6 worldwide citation)

The invention relates to a linear prediction audio signal processing apparatus, such as a vocoder, including a nonlinear filter to attenuate the residual signal used to excite a linear prediction synthesis filter. The nonlinear filter is capable of reducing the noise component in the signal while ke ...