Abstract
A vector quantization apparatus performs coding of a linear predictive coding coefficient by multi-stage vector quantization. A first codebook and a second codebook store code vectors and a storing section stores scalars. A first quantizing section extracts a first code vector stored in the first codebook and performs first stage quantization for quantizing a target vector using the first code vector. A second quantizing section extracts a second code vector stored in the second codebook calculates a third code vector by multiplying the second code vector and one of the scalars stored in the storing section performs distance calculation using the target vector the first code vector and the third code vector and performs second stage quantization for quantizing the target vector using a result of the distance calculation. Each scalar stored in the storing section is associated with at least one of the vectors stored in the first codebook.
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| 5G,4G,3G,2G | 08/12/2005 | ISLD-200601-003 | PANASONIC CORP | No | Family Member | ||||
| 5G,4G,3G,2G | 14/10/2020 | ISLD-202010-001 | GODO KAISHA IP BRIDGE 1 |
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| US6415254B1 | 5G,4G,3G,2G | 14/10/2020 | ISLD-202010-001 | GODO KAISHA IP BRIDGE 1 | Yes | Basis Patent | ||||
| US6415254B1 | 5G,4G,3G,2G | 14/10/2020 | ISLD-202010-001 | GODO KAISHA IP BRIDGE 1 |
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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| Declaration Date | Declaration Reference | Declaring Company | Specification Information | |||||||||
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Technologies
Signal Processing
Product
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Use Cases
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Services
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Claim
1. A vector quantization apparatus for performing coding of a linear predictive coding coefficient used for linear predictive coding synthesis by multi-stage vector quantization, the apparatus comprising:
an input terminal that receives an information signal;
a first codebook storage that stores a plurality of first code vectors;
a second codebook storage that stores a plurality of second code vectors;
a scalar storage that stores a plurality of scalars associated with the plurality of first code vectors, respectively;
a first quantizer that extracts a first code vector stored in the first codebook storage and performs first stage quantization for quantizing a target vector of the information signal using the first code vector;
a second quantizer that extracts a second code vector stored in the second codebook storage, calculates a third code vector by multiplying the second code vector and a scalar, performs distance calculation using the target vector, the first code vector and the third code vector, where the target vector and the first code vector are not multiplied by the scalar by which the second code vector is multiplied, and performs second stage quantization for quantizing the target vector using a result of the distance calculation; and
an output terminal that transmits a resultant coded information signal over a transmission path,
wherein the second quantizer uses, as the scalar by which the second code vector is multiplied, one of the scalars that is stored in the scalar storage and is associated with the first code vector extracted by the first quantizer.', 'an input terminal that receives an information signal;', 'a first codebook storage that stores a plurality of first code vectors;', 'a second codebook storage that stores a plurality of second code vectors;', 'a scalar storage that stores a plurality of scalars associated with the plurality of first code vectors, respectively;', 'a first quantizer that extracts a first code vector stored in the first codebook storage and performs first stage quantization for quantizing a target vector of the information signal using the first code vector;', 'a second quantizer that extracts a second code vector stored in the second codebook storage, calculates a third code vector by multiplying the second code vector and a scalar, performs distance calculation using the target vector, the first code vector and the third code vector, where the target vector and the first code vector are not multiplied by the scalar by which the second code vector is multiplied, and performs second stage quantization for quantizing the target vector using a result of the distance calculation; and', 'an output terminal that transmits a resultant coded information signal over a transmission path,', 'wherein the second quantizer uses, as the scalar by which the second code vector is multiplied, one of the scalars that is stored in the scalar storage and is associated with the first code vector extracted by the first quantizer.
2. The vector quantization apparatus according to claim 1,
wherein the first quantizer calculates distances between the target vector and all of the first code vectors stored in the first codebook storage, compares the calculated distances and determines a first code vector of a shortest distance.', 'wherein the first quantizer calculates distances between the target vector and all of the first code vectors stored in the first codebook storage, compares the calculated distances and determines a first code vector of a shortest distance.
3. The vector quantization apparatus according to claim 2,
wherein the second quantizer calculates a plurality of third code vectors associated with all of the second code vectors stored in the second codebook storage, calculates distances using the target vector, the first code vector determined in the first quantizer and the plurality of third code vectors, compares the calculated distances and determines a second code vector of a shortest distance.', 'wherein the second quantizer calculates a plurality of third code vectors associated with all of the second code vectors stored in the second codebook storage, calculates distances using the target vector, the first code vector determined in the first quantizer and the plurality of third code vectors, compares the calculated distances and determines a second code vector of a shortest distance.']
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