Transform based scalable audio compression algorithms and low cost audio multi-point conferencing systems
AssigneeIntel Corporation
InventorRobert E. Holm
Life of this patent
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Abstract
A transform based compression mechanism to establish a single compression technique which is applicable for all audio compression ranging from very low bit rate speech to CD/Audio quality music. Additionally, a multiconferencing unit (multi-point bridge) is provided which takes advantage of the transform based compression algorithm by providing a simple, low cost way of combining multiple parties without the need for transcoding.
Claims25
A method of compressing audio signal and performing an audio bridge on the audio signal comprising the steps of:
- defining classes for a plurality of audio signals, each of said plurality of audio signals originating from an audio source of a single class;
- transforming each of said plurality of audio signals into sub-band signals using linear transformation;
- and
- performing an audio bridge to said sub-band signals of each of said plurality of audio signals, creating a composite audio bit stream for each of said plurality of audio signals, said composite audio bit stream for each of said plurality of audio signals transmitted to its destination.
An apparatus for compressing audio signal and performing an audio bridge on the audio signal comprising:
- means for transforming each of a plurality of audio signals of different classes into a sub-band signal, each audio signal in said plurality of audio signals originating from an audio source of a single class;
- and
- means for performing an audio bridge to said sub-band signal of each of said plurality of audio signals, creating a composite signal for each of said plurality of audio signals, said composite signal of each of said plurality of audio signals transmitted to its destination.
An apparatus for compressing audio signal and performing an audio bridge on the audio signal comprising:
- a transforming element for transforming each of a plurality of audio signals of different classes into sub-band signals, each audio signal in said plurality of audio signals originating from an audio source of a single class;
- and
- an audio bridge element adding said sub-band signals of each of said plurality of audio signals, creating a composite signal for each of said plurality of audio signals, said composite signal of each of said plurality of audio signals transmitted to its destination.
A system for compressing audio signal and performing an audio bridge on the audio signal comprising:
- means for transforming each of a plurality of audio signals of different classes into sub-band signals, each audio signal in said plurality of audio signals originating from an audio source of a single class;
- and
- means for performing an audio bridge to said sub-band signals of each of said plurality of audio signals, creating a composite signal for each of said plurality of audio signals, said composite signal of each of said plurality of audio signals transmitted to its destination.
A system for compressing audio signal and performing an audio bridge on the audio signal comprising:
- a transforming element for transforming each of a plurality of audio signals of different classes into a sub-band signal, each audio signal in said plurality of audio signals originating from an audio source of a single class;
- and
- an audio bridge for adding sub-band signals of each of said plurality of audio signals, creating a composite signal for each of said plurality of audio signals, said composite signal of each of said plurality of audio signals transmitted to its destination.
Dependencies are inferred from the claim text.