Patent ID: 6349197
Filing Date: 2002-02-19
Classification: G10L,H04B,H04L,H04W

Abstract:
A radio communication system for transmitting speech information, comprising:mobile stations, each having a first speech coder/decoder; at least one transcoder unit having a second speech coder/decoder; at least one broadband speech coding method and one narrowband speech coding method that are selectable, at least by one of the first and second speech coder/decoders; a control device for monitoring transmission possibilities for a transmission channel between the first and second speech coder/decoders; given limited transmission possibilities for at least parts of the transmission channel, a changeover being effected from broadband to narrowband speech coding methods; and a device for bandwidth expansion which expands transmitted narrowband speech information to a larger bandwidth, wherein the selected narrowband speech coding method provides a higher level of coding protection than a level of coding protection of the broadband speech coding method.