1
David E Borth, Ira A Gerson, Philip J Smanski, Richard J Vilmur: Automatic gain selector for a noise suppression system. Motorola, Douglas A Boehm, Donald B Southard, Charles L Warren, December 16, 1986: US04630305 (216 worldwide citation)

An automatic gain selector is disclosed for use with a noise suppression system which performs speech quality enhancement upon a noisy speech signal available at the input to generate a noise-suppressed speech signal at the output by spectral gain modification. The channel gain controller (240) of t ...


2
Richard J Vilmur, Joseph J Barlo, Ira A Gerson, Brett L Lindsley: Noise suppression system. Motorola, Douglas A Boehm, Charles L Warren, Anthony J Sarli Jr, March 7, 1989: US04811404 (189 worldwide citation)

An improved noise suppression system (800) is disclosed which performs speech quality enhancement upon the speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The improvements of the present invention include the ...


3
David E Borth, Ira A Gerson, Richard J Vilmur: Automatic background noise estimator for a noise suppression system. Motorola, Douglas A Boehm, Donald B Southard, Charles L Warren, December 16, 1986: US04630304 (181 worldwide citation)

An improved background noise estimator (320) is disclosed for use with a noise suppression system (300) for generating an estimate of the background noise power spectral density provided to noise suppressor (310), which performs speech quality enhancement upon the pre-processed speech-plus-noise sig ...


4
David E Borth, Ira A Gerson, Richard J Vilmur: Noise suppression system. Motorola, Douglas A Boehm, Donald B Southard, Charles L Warren, December 9, 1986: US04628529 (166 worldwide citation)

An improved noise suppression system (400) is disclosed which performs speech quality enhancement upon speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The noise suppression system of the present invention incl ...


5
David E Borth: TDMA communications system with adaptive equalization. Motorola, Douglas A Boehm, Steven G Parmelee, Anthony J Sarli Jr, July 25, 1989: US04852090 (143 worldwide citation)

A method and means for reducing multipath interference distortion in a time-division multiple access (TDMA) communications system is disclosed. A transmitting station (100) formats one or more equalizer synchronization words with a first user's data word, time-multiplexes this formatted user message ...


6
David E Borth, Ira A Gerson, Richard J Vilmur: Hands-free control system for a radiotelephone. Motorola, Douglas A Boehm, Anthony J Sarli Jr, Charles L Warren, April 12, 1988: US04737976 (132 worldwide citation)

An improved hands-free user-interactive control and dialing system is disclosed for use with a speech communications device. The control system (400) includes a dynamic noise suppressor (410), a speech recognizer (420) for implementing voice-control, a device controller (430) responsive to the speec ...


7
Stephen N Levine, Larry C Puhl, Harry M Bliss, Gerald E Corrigan: Bit synchronization method for a digital radio telephone system. Motorola, Douglas A Boehm, Charles L Warren, Donald B Southard, February 7, 1989: US04803726 (123 worldwide citation)

A method and means for maintaining continuous bit synchronization of data transmitted from a remote unit through a base unit to a landline unit is disclosed. An input data stream at a first bit rate, such as digitized or encrypted speech, is interleaved with a plurality of signalling words, and tran ...


8
Daniel P Brown, Carl M Danielsen, Ezzat A Dabbish: Random number generator with digital feedback. Motorola, Douglas A Boehm, Steven G Parmelee, Anthony J Sarli Jr, August 1, 1989: US04853884 (102 worldwide citation)

A zener diode random number generator circuit is described which produces a random binary number output having a statistical distribution exhibiting a controlled degree of randomness determined in response to an input control signal. A microprocessor feedback circuit monitors the random number outpu ...


9
James P Phillips, Robert A Gunther: Dual band notch antenna for portable radiotelephones. Motorola, Douglas A Boehm, Donald B Southard, Charles L Warren, February 2, 1988: US04723305 (93 worldwide citation)

An improved antenna configuration is disclosed for a fully duplex portable radiotelephone that is normally operated in the nearly horizontal position next to the user's ear and mouth. A notch antenna is provided in the bottom portion of the portable radio transceiver parallel to the major longitudin ...


10
Ira A Gerson: Digital speech coder having improved vector excitation source. Motorola, Douglas A Boehm, Steven G Parmelee, Charles L Warren, March 28, 1989: US04817157 (87 worldwide citation)

An improved excitation vector generation and search technique (FIG. 1) is described for a code-excited linear prediction (CELP) speech coder (100) using a codebook of excitation code vectors. A set of M basis vectors V.sub.m (n) are used along with the excitation signal codewords (i) to generate the ...