Abstract: A method and an apparatus for controlling gain in a multi-audio channel system as well as a voice processing system are disclosed. The method includes: judging whether signals on any audio channels are similar or correlated; sorting audio channels of similar or correlated signals into one group if the similar or correlated signals exist on the audio channels, and using the same Automatic Gain Control (AGC) unit to process signals of this group of audio channels; and using different AGC units to process other non-similar or non-correlated signals on audio channels. The gain control apparatus includes: a judging unit, a grouping unit, a control processing unit, and at least two AGC units. Therefore, in a multi-audio channel communication, the perception of the sound locations of similar or correlated audio channels is not damaged, and the non-similar or non-correlated audio channels doe not interfere with each other.

Abstract: A method for speech switching, including: extracting mute flags from encoded speech data transmitted by each of the terminals respectively in order to determine one or more non-mute terminals; decoding the encoded speech data of each non-mute terminal respectively; calculating speech energy of each non-mute terminal according to the decoded speech data of each non-mute terminal; comparing the speech energy of the non-mute terminals and selecting one or more terminals with relatively large speech energy; performing linear superposition with different combination methods to the decoded speech data of the selected terminals, and encoding the decoded speech data which is obtained from the linear superposition of the different combination methods, and transmitting the data to the corresponding terminals respectively. An apparatus for speech switching is also disclosed. With this invention, resource consumption during procedure of speech switching may be reduced, the effect of speech communication may be improved.

Abstract: A method and an apparatus for controlling gain in a multi-audio channel system as well as a voice processing system are disclosed. The method includes: judging whether signals on any audio channels are similar or correlated; sorting audio channels of similar or correlated signals into one group if the similar or correlated signals exist on the audio channels, and using the same Automatic Gain Control (AGC) unit to process signals of this group of audio channels; and using different AGC units to process other non-similar or non-correlated signals on audio channels. The gain control apparatus includes: a judging unit, a grouping unit, a control processing unit, and at least two AGC units. Therefore, in a multi-audio channel communication, the perception of the sound locations of similar or correlated audio channels is not damaged, and the non-similar or non-correlated audio channels doe not interfere with each other.

Abstract: A method for speech switching, including: extracting mute flags from encoded speech data transmitted by each of the terminals respectively in order to determine one or more non-mute terminals; decoding the encoded speech data of each non-mute terminal respectively; calculating speech energy of each non-mute terminal according to the decoded speech data of each non-mute terminal; comparing the speech energy of the non-mute terminals and selecting one or more terminals with relatively large speech energy; performing linear superposition with different combination methods to the decoded speech data of the selected terminals, and encoding the decoded speech data which is obtained from the linear superposition of the different combination methods, and transmitting the data to the corresponding terminals respectively. An apparatus for speech switching is also disclosed. With this invention, resource consumption during procedure of speech switching may be reduced, the effect of speech communication may be improved.