Sonic Innovations, Inc.

3com Corporation

Gerald A Wilson

Xiaoling Fang

Robert Sherman Green

Garn H Morrell

Brad Giles

Shayne Messerly

David Moore

Spiro Poulis

David M Arnesen

Harrison Killian

Eric P Mitchell

Brady V Brown

Jeffrey A Hanline

Connie D York

Jeff Allen Harrell

Richard A Kunz

Brent C Higbee

A computer-implemented method for obtaining hearing enhancement fittings for a hearing aid device is described. A plurality of audiograms is collected. The plurality of audiograms is divided into one or more sets of audiograms. A representative audiogram is created for each set of audiograms. A hearing enhancement fitting is computed from each representative audiogram. A hearing aid device is programmed with one or more hearing enhancement fittings computed from each representative audiogram.

Systems and methods for obtaining hearing enhancement fittings for a hearing aid device

A computer-implemented method including receiving a first signal from an input device of a hearing aid. The first signal may include a noise signal. The computer-implemented method may include low-pass filtering first periodic samples of the first signal, and the first periodic samples may be approximately periodic with respect to a period of the noise signal. The computer-implemented method may further include low-pass filtering second periodic samples of the first signal, and the second periodic samples may be approximately periodic with respect to the period of the noise signal. The second periodic samples may also be phase shifted relative to the first periodic samples. Hearing aid systems and apparatuses are also disclosed.

Hearing aid noise reduction method, system, and apparatus

A new subband feedback cancellation scheme is proposed, capable of providing additional stable gain without introducing audible artifacts. The subband feedback cancellation scheme employs a cascade of two narrow-band filters A(Z) and B(Z) along with a fixed delay, instead of a single filter W(Z) and a delay to represent the feedback path in each subband. The first filter, A(Z), is called the training filter, and models the static portion of the feedback path in isubband, including microphone, receiver, ear canal resonance, and other relatively static parameters. The training filter can be implemented as a FIR filter or as an IIR filter. The second filter, B(Z), is called a tracking filter and is typically implemented as a FIR filter with fewer taps than the training filter. This second filter tracks the variations of the feedback path in the isubband caused by jaw movement or objects close to the ears of the user.

Subband acoustic feedback cancellation in hearing aids

A new subband feedback cancellation scheme is proposed, capable of providing additional stable gain without introducing audible artifacts. The subband feedback cancellation scheme employs a cascade of two narrow-band filters A (Z) and B (Z) along with a fixed delay, instead of a single filter W (Z) and a delay to represent the feedback path in each subband. The first filter, A (Z), is called the training filter, and models the static portion of the feedback path in i subband, including microphone, receiver, ear canal resonance, and other relatively static parameters. The training filter can be implemented as a FIR filter or as an IIR filter. The second filter, B (Z), is called a tracking filter and is typically implemented as a FIR filter with fewer taps than the training filter. This second filter tracks the variations of the feedback path in the i subband caused by jaw movement or objects close to the ears of the user.

An apparatus and method for transferring data between a host system and a communication network via a communication module wherein the communication module presents a UART-like interface to the host system. The communication module is comprised of an emulated UART module, a digital signal processor (DSP), and a DSP memory. The emulated UART provides a compatible UART-like front end for interlacing directly with a host system and additionally performs direct memory access-like (DMA) functions enabling the direct transfer of transmit data between the host system and DSP memory that is directly accessible by the DSP for modulation and/or other processing such as data compression. The emulated UART module additionally provides performance features such as adjustable buffering quantity thresholds for triggering interrupts to either the host system or DSP, and pacing features that provide the host system with the appearance and performance of a serialized UART.

UART with direct memory access buffering of data and method therefor

A simplified algorithm for digital signal interpolation and a novel architecture to implement the algorithm in an integrated circuit (&ldquo;IC&rdquo;) with significant space constraints are presented. According to embodiments of the present invention, the interpolator is divided into two parts. The first part of the interpolator increases the sample rate by a factor of two and smoothes the signal using a half-band Infinite Impulse Response (&ldquo;IIR&rdquo;) filter. The second part of the interpolator increases the sample rate of the signal by a factor of thirty-two using a zero-order-hold (&ldquo;ZOH&rdquo;) circuit. In one embodiment, the half-band IIR filter is implemented using an all-pass lattice structure to minimize quantization effects. The lattice coefficients are chosen such that the structure can achieve all filter design requirements, yet is capable of being implemented with a small number of shifters and adders, and no multipliers.

Multiplierless interpolator for a delta-sigma digital to analog converter

In a system having an DSP, an ASIC and a memory, in which the ASIC generates a number of different competing interrupts for the DSP to service, the ASIC has an interrupt request control module which automatically provides the DSP with a vector pointing to the memory location of the interrupt service routine for the currently pending interrupt request having the highest priority of all pending requests. The DSP reads this vector and uses it to access the interrupt service routine in the memory. Reading of this vector causes the interrupt request to be de-asserted, which causes the next highest priority pending interrupt request to become the highest priority pending interrupt request. As a result, a new vector is presented for the next read by the DSP.

Interrupt request control module with a DSP interrupt vector generator

An apparatus and method for facilitating interaction during a communication session between an analog modem and a terminal adapter for conveying digital alert tones and control data therebetween is provided. The embodiments provide for a collateral digital communication path between a microcontroller of an analog modem and a microcontroller of a terminal adapter for selectively relaying digital alert tones and control data therebetween. One embodiment utilizes a cellular interface of an analog modem for tapping and evaluating information for the presence of control data. Upon successful identification of control data, the microcontroller of a terminal adapter is notified and the specific control data detected in identified. By providing a method of apparatus for digitally relaying control data, accuracy of identification of control data by a terminal adapter is enhanced by foregoing needless signal transformation and retransformation.

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South Jordan, UT, United States of America

Gerald A Wilson