| 摘要 |
A speech coder/decoder can select a broadband and a narrowband speech coding method. For a connection to a mobile station, a monitoring of transmission possibilities is performed, and, given limited transmission possibilities, there is a changeover from broadband to narrowband speech coding methods. The received narrowband speech information is expanded to a greater bandwidth at the receive side. The subjective speech impression is improved by the bridging of this changeover effect. This guarantees an improved speech quality to the listener, particularly with the introduction of adaptive multirate coding. |
