Method for synchronizing an alternative audio stream

A method for aligning a first audio stream played back in the form of a sound signal by a playback device in proximity to a terminal with an alternative audio stream received by the terminal, the method comprising:

• the terminal receiving the alternative audio stream and receiving a control stream representative of the first audio stream played back on the playback device, the control stream and the alternative audio stream being synchronized according to a same time reference, and
• on receipt of a message comprising an indication according to which playback of the first audio stream by the playback device has been paused, performing the following acts:
• obtaining, from the control stream, a datum representative of a part of the audio signal of which the control stream is representative, and memorizing a first time stamp,
• capturing the sound signal played back by the playback device,
• detecting the datum in the captured sound signal, and
• when the datum is detected from the captured signal:
• determining a second time stamp, and
• applying a delay to the alternative audio stream, the delay corresponding to the time interval between the first and second stamps, and
• playing back the alternative audio stream received by the terminal.

A device for synchronizing a first audio stream played back by a playback device in proximity with an alternative audio stream received by the device, wherein the device receives a control stream corresponding to the first audio stream played back on the playback device, the control stream and the alternative audio stream being synchronized according to a same time reference, and wherein the device comprises:

• an audio interface, adapted to capture a part of the sound signal played back by the playback device,
• a communication interface, adapted to receive at least the alternative audio stream and a control stream,
• a signal processing unit, adapted to obtain a first datum representative of at least a part of the captured sound signal,
• a detector, configured to detect, in the control stream, the first datum,
• wherein the communication interface is also adapted to, prior to playing back the alternative audio stream received by the terminal:
• emit, to the playback device, a command to pause reading of the first audio stream;
• upon detection of the first datum in the control stream by the detector, emit to the playback device a command to resume the reading of the first audio stream.

A non-transitory processor-readable information medium, on which is stored a computer program comprising instructions for executing a synchronization method when the program is run by a processor of a terminal, wherein the synchronization method comprises synchronizing a first audio stream played back in the form of a sound signal by a playback device in proximity to the terminal with an alternative audio stream received by the terminal, including the following acts performed by the terminal:

• capturing a part of the sound signal,
• receiving a control stream representative of the first audio stream played back on the playback device, the control stream and the alternative audio stream being synchronized according to a same time reference,
• obtaining a first datum representative of at least a part of the captured sound signal, and
• prior to playing back the alternative audio stream received by the terminal:
• emitting, to the playback device, a command to pause reading of the first audio stream,
• detecting the first datum in the control stream, and
• upon detection of the first datum in the control stream:
• emitting, to the playback device, a command to resume reading of the first audio stream.