Transform based scalable audio compression algorithms and low cost audio multi-point conferencing systems
First Claim
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1. 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.
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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.
277 Citations
25 Claims
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1. A method of compressing audio signal and performing an audio bridge on the audio signal comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for compressing audio signal and performing an audio bridge on the audio signal comprising:
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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. - View Dependent Claims (7, 8, 9, 10)
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11. An apparatus for compressing audio signal and performing an audio bridge on the audio signal comprising:
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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. - View Dependent Claims (12, 13, 14, 15)
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16. A system for compressing audio signal and performing an audio bridge on the audio signal comprising:
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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. - View Dependent Claims (17, 18, 19, 20)
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21. A system for compressing audio signal and performing an audio bridge on the audio signal comprising:
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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. - View Dependent Claims (22, 23, 24, 25)
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Specification