Optimized mixing of audio streams encoded by sub-band encoding

A device for mixing a plurality of coded audio streams according to a frequency sub-band coding, comprising:

• a module (902) for decoding a part of the coded streams over at least a first frequency sub-band;
• a module (903) for summing the streams thus decoded so as to form at least a first mixed stream;
• the device being characterized in that it furthermore comprises:
• a module (901) for detection, over at least a second frequency sub-band different from the at least first sub-band, of the presence of a predetermined frequency band within the plurality of coded audio streams;
• a module (903) for summing the decoded audio streams for which the presence of the predetermined frequency band has been detected, over said at a second sub-band, so as to form at least a second mixed stream.

A conference bridge comprising a mixing device for mixing a plurality of coded audio streams according to a frequency sub-band coding, comprising:

• a module (902) for decoding a part of the coded streams over at least a first frequency sub-band;
• a module (903) for summing the streams thus decoded so as to form at least a first mixed stream;
• the device being characterized in that it furthermore comprises:
• a module (901) for detection, over at least a second frequency sub-band different from the at least first sub-band, of the presence of a predetermined frequency band within the plurality of coded audio streams;
• a module (903) for summing the decoded audio streams for which the presence of the predetermined frequency band has been detected, over said at a second sub-band, so as to form at least a second mixed stream.

A Communications device comprising a mixing device for mixing a plurality of coded audio streams according to a frequency sub-band coding, comprising:

• a module (902) for decoding a part of the coded streams over at least a first frequency sub-band;
• a module (903) for summing the streams thus decoded so as to form at least a first mixed stream;
• the device being characterized in that it furthermore comprises:
• a module (901) for detection, over at least a second frequency sub-band different from the at least first sub-band, of the presence of a predetermined frequency band within the plurality of coded audio streams;
• a module (903) for summing the decoded audio streams for which the presence of the predetermined frequency band has been detected, over said at a second sub-band, so as to form at least a second mixed stream.

A Computer program comprising code instructions for implementation of steps of a method of mixing, a plurality of coded audio streams according to a coding by frequency sub-bands, when these instructions are executed by a processor, the method comprising:

• decoding (E201) of a part of the coded streams over at least a first frequency sub-band;
• summing (E202) of the streams thus decoded so as to form at least a first mixed stream;
• the method being characterized in that it comprises the steps for:
• detection (E203), over at least a second frequency sub-band different from the at least first sub-band, of the presence of a predetermined frequency band within the plurality of coded audio streams;
• summing (E205) of the decoded audio streams (E204) for which the presence of the predetermined frequency band has been detected, over said at least second sub-band, so as to form at least a second mixed stream.

A Storage media readable by a processor, on which a computer program is stored comprising code instructions for execution of steps of a method of mixing a plurality of coded audio streams according to a coding by frequency sub-bands, the method comprising:

• decoding (E201) of a part of the coded streams over at least a first frequency sub-band;
• summing (E202) of the streams thus decoded so as to form at least a first mixed stream;
• the method being characterized in that it comprises the steps for:
• detection (E203), over at least a second frequency sub-band different from the at least first sub-band, of the presence of a predetermined frequency band within the plurality of coded audio streams;
• summing (E205) of the decoded audio streams (E204) for which the presence of the predetermined frequency band has been detected, over said at least second sub-band, so as to form at least a second mixed stream.