1. A method of voice decoding comprising:
dequantizing voice parameter information extracted from a selectively-quantized voice band; and
performing an inverse transform on the basis of the dequantized voice parameter information.
2. The method of claim 1,
wherein the selectively-quantized voice band includes at least one predetermined fixed low-frequency voice band to be quantized and at least one selected high-frequency voice band to be quantized.
3. The method of claim 2,
wherein the at least one selected high-frequency voice band is a high-frequency band having a large energy portion which is selected on the basis of energy distribution information of a voice band.
4. The method of claim 2,
wherein the performing the inverse transform on the basis of the dequantized voice parameter information includes performing the inverse transform by applying different codebooks to the voice band to be quantized which are selected on the basis of the dequantized voice parameter information.
5. The method of claim 4,
wherein the voice band to be quantized includes at least one predetermined fixed low-frequency voice band to be quantized and at least one selected high-frequency voice band to be quantized.
6. The method of claim 5,
wherein the performing the inverse transform by applying different codebooks to the voice band to be quantized includes reconstructing a voice signal on the basis of a first codebook and a voice parameter of the dequantized low-frequency voice band to be quantized and reconstructing a voice signal on the basis of a second codebook and a voice parameter of the dequantized high-frequency voice band to be quantized.
7. The method of claim 4,
wherein the performing the inverse transform on the basis of the dequantized voice parameter information includes reconstructing a voice signal by applying a dequantized comfort noise level to a voice band not to be quantized.
8. The method of claim 1,
wherein the selectively-quantized voice band includes a predetermined at least one fixed low-frequency voice band to be quantized and at least one selected high-frequency voice band to be quantized.
9. The method of claim 8,
wherein the dequantizing the voice parameter information extracted from the selectively-quantized voice band includes dequantizing the voice parameter information extracted from the high-frequency voice band to be quantized which is selected by a combination most similar to an original signal and the at least one predetermined fixed low-frequency voice band to be quantized using analysis-by-synthesis (AbS).
10. The method of claim 9,
wherein the performing the inverse transform on the basis of the dequantized voice parameter information includes performing the inverse transform on the high-frequency voice band to be quantized using an inverse direct Fourier transform (IDFT) and performing the inverse transform on the low-frequency voice band to be quantized using an inverse fast Fourier transform (IFF).
11. A voice decoder comprising:
a dequantization unit that dequantizes voice parameter information extracted from a selectively-quantized voice band; and
an inverse transform unit that performs an inverse transform on the basis of the voice parameter information dequantized by the dequantization unit.
12. The voice decoder of claim 11,
wherein the selectively-quantized voice band includes a at least one predetermined fixed low-frequency voice band to be quantized and at least one selected high-frequency voice band to be quantized.
13. The voice decoder of claim 11,
wherein the inverse transform unit reconstructs a voice signal by determining a voice band to be quantized on the basis of the dequantized voice parameter information and applying different codebooks to the voice band to be quantized.
14. The voice decoder of claim 11,
wherein the dequantization unit dequantizes the voice parameter information extracted from the high-frequency voice band to be quantized which is selected by a combination most similar to an original signal and the at least one predetermined fixed low-frequency voice band to be quantized using analysis-by-synthesis (AbS).
15. The voice decoder of claim 11,
wherein the inverse transform unit performs the inverse transform on the high-frequency voice band to be quantized using an inverse direct Fourier transform (IDFT) and performs the inverse transform on the low-frequency voice band to be quantized using an inverse fast Fourier transform (IFF).
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A system device comprising a NIC including a network IF, a protocol process functional portion, and an encryption process functional portion as well as a controller responsible for overall control, the controller performing, depending on a link status, power-saving control that selectively reduces or terminates processing abilities of the protocol process functional portion andor the encryption process functional portion by executing for the protocol process functional portion andor the encryption process functional portion of the NIC a combination of different energy-saving processes corresponding to the processing functions thereof to stepwise reduce electric power consumed by constituent elements of the process functional portions depending on the link status.
2. The system device comprising a NIC as defined in claim 1, wherein in one of the energy-saving processes, it is determined whether a protocol process is performed by the NIC or the controller in accordance with the link status, and wherein if the process is performed by the controller, the power supply to the protocol process functional portion and the encryption process functional portion is terminated in the NIC.
3. The system device comprising a NIC as defined in claim 2, wherein in another one of the plurality of the energy-saving processes, depending on the link status, an operation clock frequency is changed in a CPU, which is one of constituent elements of the protocol process functional portion and the encryption process functional portion.
4. The system device comprising a NIC as defined in claim 2, wherein in yet another one of the plurality of the energy-saving processes, encryption by hardware and encryption by software are switched in an encryption process executed by the encryption process functional portion depending on the link status.
5. The system device comprising a NIC as defined in claim 1, wherein the power consumption information of the constituent elements implementing the functions of the NIC is stored in a storage portion and wherein based on the power consumption information of the constituent elements acquired from the storage portion, the controller determines an optimum combination of the energy-saving processes depending on the link status.
6. The system device comprising a NIC as defined in claim 1, wherein the power-saving control is performed by executing a predetermined program with the CPU of the controller.
7. The system device comprising a NIC as defined in claim 6, wherein the predetermined program is acquired from a storage portion of the NIC portion.
8. The system device comprising a NIC as defined in claim 5, wherein the order of the power consumption in the energy-saving processes is preliminarily determined and wherein the order is adapted to the order of execution of the combined energy-saving processes.
9. The system device comprising a NIC as defined in claim 1, wherein if a plurality of NICs are connected to the controller, a power-saving state of the other NIC portion is added to the condition for determining the combination of the energy-saving processes andor the order of application of the combined energy-saving processes for one NIC portion.
10. A power-saving controlling method of a system device comprising a NIC including a network IF, a protocol process functional portion, and an encryption process functional portion, the method comprising:
performing power-saving control that, depending on a link status, selectively reduces or terminates processing abilities of the protocol process functional portion andor the encryption process functional portion by executing for the protocol process functional portion andor the encryption process functional portion of the NIC a combination of different energy-saving processes corresponding to the processing functions thereof to thereby stepwise reduce electric power consumed by constituent elements of the process functional portions in accordance with the link status.
11. The power-saving controlling method of a system device comprising a NIC as defined in claim 10, wherein the energy-saving processes include
(1) determining whether a protocol process is performed by the NIC or the controller depending on the link status and turning off the power supply to the protocol process functional portion and the encryption process functional portion in the NIC if the process is performed by the controller,
(2) changing an operation clock frequency of a CPU of the NIC implementing the functions of the protocol process functional portion and the encryption process functional portion depending on the link status, and
(3) switching the encryption process by hardware and the encryption process by software in the NIC depending on the link status.