Audio Signal Encoder

A method comprising:

• receiving within a first period a encoded audio signal comprising at least one first frame audio signal, at least one first frame audio signal multi-channel parameter and at least one further frame audio signal multi-channel parameter and receiving within a further period a further encoded audio signal comprising at least one further frame audio signal;
• determining whether the further encoded audio signal comprises at least one further frame audio signal multi-channel parameter and/or the at least one further frame audio signal multi-channel parameter is corrupted;
• and
• generating for the further frame at least two channel audio signals from either of the at least one first frame audio signal or the at least one further frame audio signal, and the encoded audio signal at least one further frame audio signal multi-channel parameter when the further encoded audio signal does not comprise at least one further frame audio signal multi-channel parameter or the at least one further frame audio signal multi-channel parameter is corrupted.

An apparatus comprising at least one processor and at least one memory including computer program code for one or more programs, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:

• determine a first coding bitrate for at least one first frame audio signal multi-channel parameter and a second coding bitrate for at least one second frame audio signal multi-channel parameter, wherein the combined first and second coding bitrate is less than a bitrate limit;
• determine for a first frame the at least one first frame audio signal multi-channel parameter;
• generate an encoded first frame audio signal multi-channel parameter within the first coding bitrate from the at least one first frame audio signal multi-channel parameter;
• determine for a second frame the at least one second frame audio signal multi-channel parameter;
• generate an encoded at least one second frame audio signal multi-channel parameter within the second coding bitrate from the at least one second frame audio signal multi-channel parameter;
• and
• combine the encoded at least one first frame audio signal multi-channel parameter and the encoded at least one second frame audio signal multi-channel parameter.

An apparatus comprising at least one processor and at least one memory including computer program code for one or more programs, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:

• receive within a first period an encoded audio signal comprising at least one first frame audio signal, at least one first frame audio signal multi-channel parameter and at least one further frame audio signal multi-channel parameter and receive within a further period a further encoded audio signal comprising at least one further frame audio signal;
• determine whether the further encoded audio signal comprises at least one further frame audio signal multi-channel parameter and/or the at least one further frame audio signal multi-channel parameter is corrupted;
• and
• generate for the further frame at least two channel audio signals from either of the at least one first frame audio signal or the at least one further frame audio signal, and the encoded audio signal at least one further frame audio signal multi-channel parameter when the further encoded audio signal does not comprise at least one further frame audio signal multi-channel parameter or the at least one further frame audio signal multi-channel parameter is corrupted.