Abstract: A multi-channel signal encoding method includes obtaining a multi-channel signal of a current frame; determining an initial multi-channel parameter of the current frame; determining a difference parameter based on the initial multi-channel parameter of the current frame and multi-channel parameters of previous K frames of the current frame, where the difference parameter represents a difference between the initial multi-channel parameter of the current frame and the multi-channel parameters of the previous K frames, and K is an integer greater than or equal to one; determining a multi-channel parameter of the current frame based on the difference parameter and a characteristic parameter of the current frame; and encoding the multi-channel signal based on the multi-channel parameter of the current frame.

Abstract: An inter-channel phase difference (IPD) parameter extraction method includes obtaining a parameter for obtaining an information extraction manner for a current frame of a multi-channel signal; obtaining an IPD parameter extraction manner for the current frame based on the parameter for obtaining the information extraction manner, where the obtained IPD parameter extraction manner is one of at least two preset IPD parameter extraction manners; and obtaining an IPD parameter of the current frame based on the obtained IPD parameter extraction manner for the current frame.

Abstract: A multi-channel signal encoding method includes obtaining a multi-channel signal of a current frame; determining an initial multi-channel parameter of the current frame; determining a difference parameter based on the initial multi-channel parameter of the current frame and multi-channel parameters of previous K frames of the current frame, where the difference parameter represents a difference between the initial multi-channel parameter of the current frame and the multi-channel parameters of the previous K frames, and K is an integer greater than or equal to one; determining a multi-channel parameter of the current frame based on the difference parameter and a characteristic parameter of the current frame; and encoding the multi-channel signal based on the multi-channel parameter of the current frame.

Abstract: An inter-channel phase difference (IPD) parameter extraction method includes obtaining a parameter for obtaining an information extraction manner for a current frame of a multi-channel signal; obtaining an IPD parameter extraction manner for the current frame based on the parameter for obtaining the information extraction manner, where the obtained IPD parameter extraction manner is one of at least two preset IPD parameter extraction manners; and obtaining an IPD parameter of the current frame based on the obtained IPD parameter extraction manner for the current frame.

Abstract: This invention relates to a self power-acquiring quickly responsive controllable reactor whose coil of the main body portion contains a control winding (6), a net-side winding (5), further contains a tertiary winding (7). The tertiary winding (7), the control winding (6) and the net-side winding (5) are set in turn on a magnetic conductive core column of the main body portion (1) from inside to outside; the net-side winding (5) has power-acquiring taps; which connect with the primary coil of rectiformer in a rectifying-filtering unit (2). The output terminals of the rectifying-filtering unit (2) connect with the control winding (6). A quick switch (K) is in parallel connected with the tertiary winding (7). The on/off state of the quick switch (K) is controlled by the command transmitted by the control unit (4) in the controllable reactor.

Abstract: This invention relates to a self power-acquiring quickly responsive controllable reactor whose coil of the main body portion contains a control winding (6), a net-side winding (5), further contains a tertiary winding (7). The tertiary winding (7), the control winding (6) and the net-side winding (5) are set in turn on a magnetic conductive core column of the main body portion (1) from inside to outside; the net-side winding (5) has power-acquiring taps; which connect with the primary coil of rectiformer in a rectifying-filtering unit (2). The output terminals of the rectifying-filtering unit (2) connect with the control winding (6). A quick switch (K) is in parallel connected with the tertiary winding (7). The on/off state of the quick switch (K) is controlled by the command transmitted by the control unit (4) in the controllable reactor.