Processing a speech frame in a radio system

A radio system comprising:

• a channel decoder for channel-decoding a channel-coded speech frame having propagated over a radio path;
• a speech decoder for decoding the speech frame;
• and
• inferring means for inferring from the value of at least one speech parameter in the channel-decoded speech frame whether the speech frame contains speech that is decodable by means of the speech decoder if the speech frame is free of defects according to the channel decoder;
• and the speech decoder is arranged to decode the speech frame if, according to the inference, the speech frame does contain speech that is decodable by means of the speech decoder ;
• and the speech decoder is arranged not to decode the speech frame if, according to the inference, the speech frame does not contain speech that would be decodable by means of the speech decoder.

A mobile station in a radio system, comprising:

• a channel decoder for channel-decoding a channel-coded speech frame having propagated over a radio path;
• a speech decoder for decoding the speech frame;
• and
• inferring means for inferring from the value of at least one speech parameter in the channel-decoded speech frame whether the speech frame contains speech that is decodable by means of the speech decoder if the speech frame is free of defects according to the channel decoder;
• and the speech decoder is arranged to decode the speech frame if, according to the inference, the speech frame does contain speech that is decodable by means of the speech decoder;
• and the speech decoder is arranged not to decode the speech frame if, according to the inference, the speech frame does not contain speech that would be decodable by means of the speech decoder.

A network of a radio system, comprising:

• a channel decoder for channel-decoding a channel-coded speech frame having propagated over a radio path;
• a speech decoder for decoding the speech frame;
• and
• inferring means for inferring from the value of at least one speech parameter in the channel-decoded speech frame whether the speech frame contains speech that is decodable by means of the speech decoder if the speech frame is free of defects according to the channel decoder;
• and the speech decoder is arranged to decode the speech frame if, according to the inference, the speech frame does contain speech that is decodable by means of the speech decoder;
• and the speech decoder is arranged not to decode the speech frame if, according to the inference, the speech frame does not contain speech that would be decodable by means of the speech decoder.