Ati Technologies Inc.

John S Kitamura

Indra Laksono

Adrian H Hartog

Vladimir F Giemborek

Tieying Duan

Andreas Thut

The invention synchronizes and mixes multiple streams at different sampling rates by selectively accessing portions of the received streams in a sequence that allows for independent input and output frame rates. The sequence that is used to access the received streams is irregular with regard to the output frames, and formulated such that the input and output frames are synchronized to a super-frame that corresponds to a least common multiple frame in a conventional synchronizing and mixing system.

Synchronization and mixing of multiple streams at different sampling rates

In one embodiment, an automatic multichannel equalization control system uses programmable multichannel templates containing equalization control values for a programmable multichannel audio processor that selectively controls each channel of multichannel audio using the equalization control values. The system also optionally uses an adaptive equalization template interface to facilitate input of user presets that are incorporated in the stored equalization templates for each audio medium. When the audio medium's identification number (ID) is read from the medium header or a particular track, the system selects the appropriate equalization template preset by the user and programs the programmable multichannel audio processor (equalizer) to effect desired audio output.

Automatic multichannel equalization control system for a multimedia computer

An adaptive speaker compensation system and method, such as for use in a multimedia computer, stores speaker response filter coefficients for each speaker and adaptively compensates received audio for non-linear speaker characteristics based on the stored speaker response filter coefficients. The speaker response filter coefficients preferably represent an inverse response of a speaker response curve for each speaker in the audio system. Preferably a library memory containing prestored speaker characteristic data, such as the speaker response filter coefficients, is selectively accessed by the adaptive speaker compensation system to download the speaker response filter coefficients based on identification of a speaker type and channel for which the speaker is being used.

Adaptive speaker compensation system for a multimedia computer system

A system and method for providing channel balancing and room tuning for a multi-channel audio surround sound speaker system passes source audio to automatically configured multi-channel compensation filters to provide equalization on a per channel basis for speakers having differing response characteristics. The speakers correspond to each of the surround sound channels. To automatically configure the multi-channel compensation filters, a controller generates common room tuning deviation data based on the frequency response characteristic data of each of the speakers. In addition, the system and method also generates room corrected channel deviation data for each channel by correcting a selected speaker response based on room tuning compensation requirement data derived from the common room tuning deviation data. Automatic channel balancing is provided by determining channel balancing compensation requirement data based on the corrected channel deviation data for each channel.

Method and system for channel balancing and room tuning for a multichannel audio surround sound speaker system

An adaptive audio signal compression computer system corrects multiple input audio streams, such as digital multichannel audio streams from various audio sources, for equalization deficiencies caused primarily by attenuation factors experienced by a listener's human ear. A compression stage (filter stage) adaptively compresses (filters) an input audio stream by selecting the ear response data that includes a plurality of selectable sets of filter coefficients wherein each set of filter coefficients corresponds to an inverse audible listening response curve for a predetermined audio volume level. When available from an audio source, the system provides audio source type data to an adaptive compression stage and also generates a compression control signal in response to the source type data to control the compression. Listening environment data is also used to generate control parameters for the compression stage so that compression can be dynamically varied based on changing surrounding environmental circumstances.

Adaptive audio signal compression computer system and method

An automatic volume control system and method for use in a multimedia computer system having at least one speaker and at least one audio generating device accumulates a status of the audio generating device to determine if it is on or off. The system recognizes an audio mute event notification signal from a notification device, such as an incoming telephone call notification signal, and selectively generates a control signal for use in varying the volume to the at least one speaker in response to the detection of the notification signal to selectively control audio from the audio generating device. The system also accommodates multiple audio generating devices. The system analyzes the location of the telephone, speakers and audio generating devices to determine the type of action that is necessary.

Automatic volume control system and method for use in a multimedia

A method of converting video data from a YUV format to an RGB format comprising (a) performing a matrix transformation of Y, U and V pixel data of a set of possible Y, U and V parameters into corresponding R, G and B parameters, (b) determining whether the set of R, G and B parameters forms a first lookup table whose size exceeds the size of a particular memory space, (c) in the event the lookup table is too large for the memory space, truncating least significant bits of at least the U and V parameters, (d) repeating steps (a), (b) and (c) until the first lookup table fits the memory space, and then storing the first lookup table in the memory space, and (e) using the first lookup table to provide RGB pixel data using the YUV data as addresses thereto.

Optimized color space conversion

A method of reconstructing a stream of digital frequency domain audio signal samples into audio signals comprising parsing the stream of samples and reconstructing subband data in the frequency domain, processing the subband data to obtain a processed frequency domain digital audio signal, and constructing a time domain audio output signal from the processed frequency domain digital audio signal.

Integrated MPEG audio decoder and signal processor

A method of drawing moving images on a graphics display comprising (a) receiving data defining an input image in a predetermined resolution, (b) commanding a graphics processor to draw a corresponding image frame on a display having a number of scanning lines which is a multiple m of a number of scanning lines of the input image and a multiple n of a number of pixels in a horizontal line of the input image, (c) drawing successive lines of the input image on a first and on each m.sup.th scanning line of the graphics display, while stretching each pixel on each drawn line over n pixels, (d) copying each drawn line on respective immediately following m-1 lines, and (e) repeating steps (b)-(d) for successive frames of the input image.

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Toronto, Canada

John S Kitamura