Multi-reference LPC filter quantization and inverse quantization device and method
First Claim
1. A multi-reference quantization device for quantizing an input LPC filter, comprising:
- a plurality of differential quantizers using respective, different references; and
means for selecting a reference amongst the different references of the differential quanitizers using a reference selection criterion;
wherein the input LPC filter is differentially quantized by the differential quantizer using the selected reference.
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Abstract
A multi-reference quantization device and method for quantizing an input LPC filter, comprises a plurality of differential quantizers using respective, different references, and a selector of a reference amongst the different references of the differential quantizers using a reference selection criterion. The input LPC filter is differentially quantized by the differential quantizer using the selected reference. A device and method for inverse quantizing a multi-reference differentially quantized LPC filter extracted from a bitstream, comprises an extractor from the bitstream of information about a reference amongst a plurality of possible references used for quantizing the multi-reference differentially quantized LPC filter, and a differential inverse quantizer using the reference corresponding to the extracted reference information to inverse quantize the multi-reference differentially quantized LPC filter.
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Citations
36 Claims
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1. A multi-reference quantization device for quantizing an input LPC filter, comprising:
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a plurality of differential quantizers using respective, different references; and means for selecting a reference amongst the different references of the differential quanitizers using a reference selection criterion; wherein the input LPC filter is differentially quantized by the differential quantizer using the selected reference.
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2. A multi-reference quantization device for quantizing an input LPC filter, comprising:
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a plurality of differential quantizers using respective, different references; and a selector of a reference amongst the different references of the differential quantizers using a reference selection criterion; wherein the input LPC filter is differentially quantized by the differential quantizer using the selected reference. - View Dependent Claims (3, 4, 5, 6)
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7. A multi-reference quantization device for quantizing an input LPC filter, comprising:
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a plurality of differential quantizers using respective, different references; and a selector of a reference amongst the different references of the differential quantizers using a reference selection criterion; wherein the input LPC filter is differentially quantized by the differential quantizer using the selected reference; and wherein at least one of the references is selected from the group consisting of; a previously quantized LPC filter; a future quantized LPC filter; a mean value of the previously quantized and future quantized LPC filters; a LPC filter quantized using an absolute quantizer; a result of an extrapolation operation applied to a past quantized LPC filter; a result of an extrapolation operation applied to a future quantized LPC filter; a result of an interpolation operation applied to a past quantized LPC filter; a result of an interpolation operation applied to a future quantized LPC filter; a result of an auto-regressive prediction applied to a quantized LPC filter; a result of a moving average prediction applied to a quantized LPC filter; and a quantized filter value known to both an encoder and a decoder.
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8. A multi-reference quantization device for quantizing an input LPC filter, comprising:
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a plurality of differential quantizers using respective, different references; and a selector of a reference amongst the different references of the differential quantizers using a reference selection criterion; wherein the input LPC filter is differentially quantized by the differential quantizer using the selected reference; and wherein the reference selection criterion is selected from the group consisting of; a first criterion that minimizes a bit rate to achieve a target level of distortion; and a second criterion that minimizes the level of distortion produced at a given bit rate.
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9. A quantization device for quantizing an input LPC filter, comprising:
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a plurality of differential quantizers using respective, different references; at least one absolute quantizer; and a selector of one of absolute quantization mode and differential quantization modes for quantizing the input LPC filter using a quantization mode selection criterion, and of a reference amongst the different references of the differential quantizers using a reference selection criterion. - View Dependent Claims (10)
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11. A quantization device for quantizing an input LPC filter, comprising:
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a plurality of differential quantizers using respective, different references; at least one absolute quantizer; and a selector of one of absolute quantization mode and differential quantization modes for quantizing the input LPC filter using a quantization mode selection criterion, and of a reference amongst the different references of the differential quantizers using a reference selection criterion; wherein the quantization mode selection criterion is selected from the group consisting of; a first criterion that minimizes a bit rate to achieve a target level of distortion; and a second criterion that minimizes the level of distortion produced at a given bit rate.
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12. A multi-reference quantization method for quantizing an input LPC filter, comprising:
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providing a plurality of differential quantizers using respective, different references; selecting a reference amongst the different references using a reference selection criterion; and quantizing the input LPC filter with the differential quantizer using the selected reference. - View Dependent Claims (13, 14, 15, 16)
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17. A multi-reference quantization method for quantizing an input LPC filter, comprising:
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providing a plurality of differential quantizers using respective, different references; selecting a reference amongst the different references using a reference selection criterion; and quantizing the input LPC filter with the differential quantizer using the selected reference; wherein at least one of the references is selected from the group consisting of; a previously quantized LPC filter; a future quantized LPC filter; a mean value of the previously quantized and future quantized LPC filters; a LPC filter quantized using an absolute quantizer; a result of an extrapolation operation applied to a past quantized LPC filter; a result of an extrapolation operation applied to a future quantized LPC filter; a result of an interpolation operation applied to a past quantized LPC filter; a result of an interpolation operation applied to a future quantized LPC filter; a result of an auto-regressive prediction applied to a quantized LPC filter; a result of a moving average prediction applied to a quantized LPC filter; and a quantized filter value known to both an encoder and a decoder.
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18. A multi-reference quantization method for quantizing an input LPC filter, comprising:
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providing a plurality of differential quantizers using respective, different references; selecting a reference amongst the different references using a reference selection criterion; and quantizing the input LPC filter with the differential quantizer using the selected reference; wherein the reference selection criterion is selected from the group consisting of; a first criterion that minimizes a bit rate to achieve a target level of distortion; and a second criterion that minimizes the level of distortion produced at a given bit rate.
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19. A quantization method for quantizing an input LPC filter, comprising:
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providing a plurality of differential quantizers using respective, different references; providing at least one absolute quantizer; and selecting at least one of (a) a quantization mode amongst absolute quantization mode and differential quantization modes for quantizing the input LPC filter using a quantization mode selection criterion, and (b) a reference amongst the different references using a reference selection criterion. - View Dependent Claims (20)
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21. A quantization method for quantizing an input LPC filter, comprising:
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providing a plurality of differential quantizers using respective, different references; providing at least one absolute quantizer; and selecting at least one of (a) a quantization mode amongst absolute quantization mode and differential quantization modes for quantizing the input LPC filter using a quantization mode selection criterion, and (b) a reference amongst the different references using a reference selection criterion; wherein the quantization mode selection criterion is selected from the group consisting of; a first criterion that minimizes a bit rate to achieve a target level of distortion; and a second criterion that minimizes the level of distortion produced at a given bit rate.
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22. A device for inverse quantizing a multi-reference differentially quantized LPC filter extracted from a bitstream, comprising:
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means for extracting from the bitstream information about a reference amongst a plurality of possible references used for quantizing the multi-reference differentially quantized LPC filter; and means for inverse quantizing the multi-reference differentially quantized LPC filter using the reference corresponding to the extracted reference information. - View Dependent Claims (23, 24, 25)
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26. A device for inverse quantizing a multi-reference differentially quantized LPC filter extracted from a bitstream, comprising:
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an extractor from the bitstream of information about a reference amongst a plurality of possible references used for quantizing the multi-reference differentially quantized LPC filter; and a differential inverse quantizer using the reference corresponding to the extracted reference information to inverse quantize the multi-reference differentially quantized LPC filter. - View Dependent Claims (27)
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28. A device for inverse quantizing a multi-reference differentially quantized LPC filter extracted from a bitstream, comprising:
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an extractor from the bitstream of information about a reference amongst a plurality of possible references used for quantizing the multi-reference differentially quantized LPC filter; and a differential inverse quantizer using the reference corresponding to the extracted reference information to inverse quantize the multi-reference differentially quantized LPC filter; wherein the reference is selected from the group consisting of; a previously quantized LPC filter; a future quantized LPC filter; a mean value of the previously quantized and future quantized LPC filters; a LPC filter quantized using an absolute quantizer; a result of an extrapolation operation applied to a past quantized LPC filter; a result of an extrapolation operation applied to a future quantized LPC filter; a result of an interpolation operation applied to a past quantized LPC filter; a result of an interpolation operation applied to a future quantized LPC filter; a result of an auto-regressive prediction applied to a quantized LPC filter; a result of a moving average prediction applied to a quantized LPC filter; and a quantized filter value known to both an encoder and a decoder.
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29. A device for inverse quantizing a quantized LPC filter extracted from a bitstream, comprising:
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an extractor from the bitstream of information about a quantization mode amongst absolute quantization mode and differential quantization mode, and of information about a reference amongst a plurality of possible references used in the differential quantization mode; and an absolute inverse quantizer for inverse quantizing the quantized LPC filter when the information about the quantization mode indicates that the LPC filter has been quantized using the absolute quantization mode; and a differential inverse quantizer for inverse quantizing the quantized LPC filter using the reference corresponding to the extracted reference information when the information about the quantization mode indicates that the LPC filter has been quantized using the differential quantization mode.
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30. A method for inverse quantizing a multi-reference differentially quantized LPC filter extracted from a bitstream, comprising:
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extracting from the bitstream information about a reference amongst a plurality of possible references used for quantizing the multi-reference differentially quantized LPC filter; and inverse quantizing the multi-reference differentially quantized LPC filter using the reference corresponding to the extracted reference information. - View Dependent Claims (31, 32, 33, 34)
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35. A method for inverse quantizing a multi-reference differentially quantized LPC filter extracted from a bitstream, comprising:
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extracting from the bitstream information about a reference amongst a plurality of possible references used for quantizing the multi-reference differentially quantized LPC filter; and inverse quantizing the multi-reference differentially quantized LPC filter using the reference corresponding to the extracted reference information; wherein the reference is selected from the group consisting of; a previously quantized LPC filter; a future quantized LPC filter; a mean value of the previously quantized and future quantized LPC filters; a LPC filter quantized using an absolute quantizer; a result of an extrapolation operation applied to a past quantized LPC filter; a result of an extrapolation operation applied to a future quantized LPC filter; a result of an interpolation operation applied to a past quantized LPC filter; a result of an interpolation operation applied to a future quantized LPC filter; a result of an auto-regressive prediction applied to a quantized LPC filter; a result of a moving average prediction applied to a quantized LPC filter; and a quantized filter value known to both an encoder and a decoder.
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36. A method for inverse quantizing a quantized LPC filter extracted from a bitstream, comprising:
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extracting from the bitstream at least one of (a) information about a quantization mode amongst absolute quantization mode and differential quantization mode, and (b) information about a reference amongst a plurality of possible references used in the differential quantization mode; and absolute inverse quantizing the quantized LPC filter when the information about the quantization mode indicates that the LPC filter has been quantized using the absolute quantization mode; and differential inverse quantizing the quantized LPC filter using the reference corresponding to the extracted reference information when the information about the quantization mode indicates that the LPC filter has been quantized using the differential quantization mode.
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Specification