Ivl Technologies Ltd

Loud Technologies Inc

Mackie Designs Inc.

Ivl Technologis Ltd.

Christopher Michael Jubien

Brian C Gibson

Brian J Roden

Brian John Roden

Benjamin Seth Olswang

Dale John Shpak

Daniel Martin Steinberg

Constantine Lakoumentas

Andreas Teunis Martinus Kappers

Jeffrey William Sondermeyer

An analog-digital interface device is provided, which is configured to be housed within or removably coupled with an analog mixer, to thereby form a digital-output analog mixer. The analog-digital interface device includes analog-digital conversion circuitry and digital transmission circuitry that convert analog audio from the analog mixer to digital format for transmission along a digital transport interface to an external digital computing device, such as a PC or MAC computer. In one embodiment, the analog audio can be tapped from any one or more points along a signal path of the analog mixer and sent to the analog-digital interface device. In another embodiment, the analog-digital interface device is further configured to receive digital signals back from the external digital computing device, convert them to analog signals, and return them to the analog mixer at any one or more points along a signal path of the analog mixer.

Digital interface for analog audio mixers

An audio system () is provided with improved adaptive filter () to automatically adjust signal gain depending on the ambient noise level. The original music signal passes through a normalized adaptive filter (), and is subtracted from the ambient room signal detected by a microphone (), resulting in an error signal that is an estimate of the ambient noise. The error signal is used to update a set of adaptation coefficients so that the normalized adaptive filter more accurately simulates the room transfer function, resulting in an better estimate of the ambient noise. The audio system () is calibrated automatically upon initial use to determine adaptation coefficients and noise threshold level to prevent runaway gain. System parameters are adjusted using a controller () with a user-friendly interface ().

Method and apparatus for automatic volume control in an audio system

A method for shifting the timbre and/or pitch of an input signal samples the input signal at a first rate and stores the samples in a memory buffer. A digital signal processor resamples the stored input signal at a rate that differs from the first rate at which the input note is originally sampled and stores the resampled input signal in a second memory buffer. A pitch shifter shifts the pitch of the input signal by periodically scaling the resampled input signal by a window function to create an output signal. The rate at which the resampled data is replicated by the window function determines the pitch of the output signal.

Method and apparatus for changing the timbre and/or pitch of audio

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Victoria, Canada

Christopher Michael Jubien