Device for encoding and decoding transmission signals through adaptive selection of transforming methods
First Claim
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1. A device for encoding transmission signals through adaptive selection of different transforms, comprising:
- transforming means, having at least two different transforms, each of which performs a different type of transform operation on an input signal, providing a plurality of respective transformed data signals;
energy detection means coupled to said transforming means for detecting respective energy levels representing each of said transformed data signals and for outputting a selection signal indicative of the transformed data signal having a highest energy level; and
a multiplexer for receiving said plurality of transformed data signals and said selection signal and for selectively outputting a transformed signal in accordance with said received signals.
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Abstract
A device is provided for encoding and decoding transmitted signals through adaptive selection of different transform methods. An original signal or a predicted error signal having at least one dimension is input in parallel to a plurality of different transforms. The total energy level of coefficients, corresponding to low frequency components, from each transform is measured and compared. The output of the transform having the largest energy, is selected and encoded for transmission, and thereafter the transmission signal is decoded. The device maximizes encoding and decoding efficiencies.
96 Citations
16 Claims
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1. A device for encoding transmission signals through adaptive selection of different transforms, comprising:
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transforming means, having at least two different transforms, each of which performs a different type of transform operation on an input signal, providing a plurality of respective transformed data signals; energy detection means coupled to said transforming means for detecting respective energy levels representing each of said transformed data signals and for outputting a selection signal indicative of the transformed data signal having a highest energy level; and a multiplexer for receiving said plurality of transformed data signals and said selection signal and for selectively outputting a transformed signal in accordance with said received signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A decoding device that receives transmitted data and a selection signal, for decoding said transmitted data, comprising:
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inverse transforming means, having at least two different inverse transforms, for inversely transforming said transmitted data and outputting at least two inversely transformed signals, each of which corresponds to one of said inverse transforms; and a multiplexer for outputting one of said inversely transformed signals based on said received selection signal.
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11. A method for operating an apparatus for encoding transmission signals through adaptive selection of different transforms including N transformers operating in parallel, each of said N transformers performing a different transform to thereby output a respective transformed data signal, where N is an integer greater than one, and an energy detector receiving respective portions of said transformed data signals, said method comprising the steps of:
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(a) generating said transformed data signals; (b) generating a selection signal in response to said portions of said transformed data signals; and (c) transmitting a selected one of said transformed data signals in response to said selection signal. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification