Abstract: A double-talk state detection method includes: calculating an energy ratio between a first energy of an error signal in each sub-band of M sub-bands and a second energy of a filtered signal in the same sub-band as the error signal, thereby obtaining M energy ratios, where the error signal is a difference between an input signal collected by a microphone and the filtered signal, the filtered signal is a signal obtained after performing filtering process on a reference signal, and M is a positive integer; performing a first smoothing processing on the M energy ratios to obtain M first energy smoothing ratios, and performing a second smoothing processing on the M first energy smoothing ratios to obtain M second energy smoothing ratios; performing double-talk state detection based on the M first energy smoothing ratios and the M second energy smoothing ratios to determine a state of the input signal.

Abstract: A double-talk state detection method includes: calculating an energy ratio between a first energy of an error signal in each sub-band of M sub-bands and a second energy of a filtered signal in the same sub-band as the error signal, thereby obtaining M energy ratios, where the error signal is a difference between an input signal collected by a microphone and the filtered signal, the filtered signal is a signal obtained after performing filtering process on a reference signal, and M is a positive integer; performing a first smoothing processing on the M energy ratios to obtain M first energy smoothing ratios, and performing a second smoothing processing on the M first energy smoothing ratios to obtain M second energy smoothing ratios; performing double-talk state detection based on the M first energy smoothing ratios and the M second energy smoothing ratios to determine a state of the input signal.

Abstract: A fully-automatic cutting and welding apparatus for stepped steel plate, comprising a multi-function motion module (1), an automatic feed library turntable (2), a product flip platform (3), a steel plate bearing module (4), a pedestal (5), and a base (6). The multi-function motion module (1) is capable of performing motion in a Y-axis direction on the pedestal (5); the pedestal (5) is fixed on a surface edge of the base (6);the automatic feed library turntable (2) is fixed at one end of the base (6); the product flip platform (3) is disposed between the automatic feed library turntable (2) and the steel plate bearing module (4), and the steel plate bearing module (4) is fixed at the other end of the base (6) for bearing and fixing a steel plate, and is used as a welding platform for the final steel plate step part.

Abstract: A fully-automatic cutting and welding apparatus for stepped steel plate, comprising a multi-function motion module (1), an automatic feed library turntable (2), a product flip platform (3), a steel plate bearing module (4), a pedestal (5), and a base (6). The multi-function motion module (1) is capable of performing motion in a Y-axis direction on the pedestal (5); the pedestal (5) is fixed on a surface edge of the base (6);the automatic feed library turntable (2) is fixed at one end of the base (6); the product flip platform (3) is disposed between the automatic feed library turntable (2) and the steel plate bearing module (4), and the steel plate bearing module (4) is fixed at the other end of the base (6) for bearing and fixing a steel plate, and is used as a welding platform for the final steel plate step part.

Abstract: A method for encoding or decoding an LDPC code with variable code lengths is provided in an embodiment of the present invention. The method includes: obtaining a base exponential matrix of an LDPC code and grouping code lengths during construction of the base exponential matrix; correcting the base exponential matrix according to a grouping correction factor to obtain an exponential matrix of the group corresponding to the grouping correction factor; extending the exponential matrix by using an extension factor of a code length in the group to obtain an LDPC matrix corresponding to the code length; and implementing encoding or decoding by using the LDPC matrix.

Abstract: A method for encoding or decoding an LDPC code with variable code lengths is provided in an embodiment of the present invention. The method includes: obtaining a base exponential matrix of an LDPC code and grouping code lengths during construction of the base exponential matrix; correcting the base exponential matrix according to a grouping correction factor to obtain an exponential matrix of the group corresponding to the grouping correction factor; extending the exponential matrix by using an extension factor of a code length in the group to obtain an LDPC matrix corresponding to the code length; and implementing encoding or decoding by using the LDPC matrix.

Abstract: This invention involves a type of oligosacoharides and its their sulfate derivatives. The backbone of the oligosaccharides consists of 4 to 14 glucose residues, while the side chains contain 0 to 4 glucose residues. There are at least one 1->3? linkage and ?-(1->3)-Iinkage or ?-(1->4) linkage in the backbone. These oligosaccharides, and their sulfates have immune enhancing, antitumor, and antiviral activities. They can be used in immune enhancing, antitumor, and antiviral medicine compounds that would be used as therapeutic treatments.

Abstract: This invention involves a type of oligosaccharides and its sulfate derivatives. The backbone of the oligosaccharides consists of 3 to 14 sugar residues, while the side chains contain 0 to 4 sugar residues. There is at least one 1→3&agr; linkage in the backbone. This invention also involves the dendrimers composed of 2 to 3 oligosaccharides that are combined by polyhydroxyl compounds. These oligosaccharides, their sulfates and dendrimers have immune enhancing, antitumor, and antiviral activities. They can be used in immune enhancing, antitumor, and antiviral medicine compounds that would be used as therapeutic treatments.