Identifying Audio Characteristics of a Room Using a Spread Code

A system, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• receive, at a location, a spread spectrum signal from a first electronic device over an audio data channel;
• despread the spread spectrum signal based on a spreading code;
• determine a time of receipt of the spread spectrum signal based on the despreading;
• receive a time of transmission of the spread spectrum signal;
• calculate an airtime delay associated with the first electronic device based on the time of receipt and the time of transmission;
• and
• adjust the playback of the audiovisual content at the first electronic device and a second electronic device for the location based on the airtime delay associated with the first electronic device.

A computer implemented method for identifying electronic devices in a room, comprising:

• receiving, by at least one processor at a first electronic device, a spread spectrum signal from a second electronic device over an audio data channel;
• despreading, by the at least one processor, the spread spectrum signal based on a spreading code;
• determining, by the at least one processor, a time of receipt of the spread spectrum signal based on the despreading;
• receiving, by the at least one processor, a time of transmission of the spread spectrum signal;
• calculating, by the at least one processor, a distance between the first electronic device and the second electronic device based on the time of receipt and the time of transmission;
• and
• determining, by the at least one processor, the second electronic device is not in the room with the first electronic device based on the distance,
• wherein at least one of the receiving the spread spectrum signal, despreading, determining the time of receipt, receiving the time of transmission of the spread spectrum signal, calculating the playback delay, and determining the first electronic device is not in the room with the second electronic device are performed by one or more computers.