1
James Mitchell Kates, John Laurence Melanson: Apparatus and methods for combining audio compression and feedback cancellation in a hearing aid. GN ReSound, Jennifer L Bales, Macheledt Bales, August 13, 2002: US06434246 (120 worldwide citation)

The present invention combines audio compression and feedback cancellation in an audio system such as a hearing aid. The feedback cancellation element of the present invention uses one or more filters to model the feedback path of the system and thereby subtract the expected feedback from the audio ...


2
Joseph Isaac Shapiro, Howard David Weinberger: Apparatus and methods for analyzing heart sounds. The Regents of the University of Colorado, Jennifer L Bales, November 18, 1997: US05687738 (118 worldwide citation)

Apparatus for assisting in the analysis of heart sounds monitors heart sounds, ECG, and respiratory data. Once digitized, this data is processed and analyzed to determine timing relationships between the three signals, frequency (or pitch) of sounds, and dependence or non-dependence of sounds on ECG ...


3
James Mitchell Kates, John Laurence Melanson: Feedback cancellation improvements. GN ReSound, Jennifer L Bales, Macheledt Bales & Johnson, April 17, 2001: US06219427 (104 worldwide citation)

Feedback cancellation apparatus uses a cascade of two filters along with a short bulk delay. The first filter is adapted when the hearing aid is turned on in the ear. This filter adapts quickly using a white noise probe signal, and then the filter coefficients are frozen. The first filter models par ...


4
John Laurence Melanson: Power supply compensation for noise shaped, digital amplifiers. Audio Logic, Jennifer L Bales Macheledt Bales, February 5, 2002: US06344811 (93 worldwide citation)

The digital amplifier of the present invention comprises a delta sigma noise shaper feeding a pulse wave modulator (PWM) which drives a load such as a speaker. The amplifier includes circuitry to measure the voltage coming out of the power supply in the circuit, and using this measurement as a contr ...


5
James Mitchell Kates, John Laurence Melanson: Feedback cancellation apparatus and methods utilizing adaptive reference filter mechanisms. GN ReSound, Jennifer L Bales, Macheledt Bales, August 13, 2002: US06434247 (87 worldwide citation)

A feedback cancellation system for a hearing aid or the like adapts a first filter in the feedback path that models the quickly varying portion of the hearing aid feedback path, and adapts a second filter in the feedback path that is used either as a reference filter for constrained adaptation or to ...


6
Hongxing Jiang, Jingyu Lin, Sixuan Jin, Jing Li: Micro-size LED and detector arrays for minidisplay, hyper-bright light emitting diodes, lighting, and UV detector and imaging sensor applications. Kansas State University Research Foundation, Jennifer L Bales, Macheledt Bales, June 25, 2002: US06410940 (87 worldwide citation)

A micro-size LED-like optical element has an n-contact, a p-contact, and an optical active structure connected between the n-contact and the p-contact for generating light when forward biased and for detecting light when reverse biased. The optical active structure has a diameter of about 20 &mgr;m ...


7
Paul E Johnson: Flow cytometry apparatus and method. SoftRay, Jennifer L Bales, Macheledt Bales & Johnson, July 3, 2001: US06256096 (81 worldwide citation)

A flow cytometer for detecting target particles such as microorganisms including biological cells and viruses as well as molecular species. The flow cytometer includes a detection system involving a CCD having a time delay integration capability to thereby increase the signal from the target particl ...


8
Richard Ray Hurtig, Christopher William Turner: Apparatus and methods for proportional audio compression and frequency shifting. University of Iowa Research Foundation, Jennifer L Bales, Macheledt Bales, June 10, 2003: US06577739 (81 worldwide citation)

Apparatus and methods for audio compression and frequency shifting retain the spectral shape of an audio input signal while compressing and shifting its frequency. The fast Fourier transform of the input signal is generated, to allow processing in the frequency domain. The input audio signal is divi ...


9
John Laurence Melanson: Real time correction of a digital PWM amplifier. Cirrus Logic, Jennifer L Bales Esq, Dan A Shifrin Esq, April 16, 2002: US06373334 (72 worldwide citation)

Distortion and noise in high power digital PWM amplifiers is reduced by measuring the difference between the desired output signal and the actual output signal on a pulse by pulse basis. This analog error is converted into a digital signal with an analog to digital converter (ADC). The digital error ...


10
Steven Robert Vetorino, James Victor Platt, Douglass Anderson Springer: Renewable energy flashlight. Applied Innovative Technologies, Jennifer L Bales, Macheledt Bales & Johnson, April 24, 2001: US06220719 (68 worldwide citation)

A renewable energy flashlight comprises a housing and a barrel located within the housing. A wire coil wraps around the barrel, between the barrel and the housing. A magnet oscillates within the barrel when the flashlight is shaken, generating an alternating current in the coil. Two springs at eithe ...



Click the thumbnails below to visualize the patent trend.