Methods and apparatus to detect spillover

A method comprising:

• obtaining, at a media meter, an audio signal;
• comparing a difference of a sample amplitude of the audio signal and a previous amplitude of the audio signal to a loud threshold;
• setting a loudness flag to a loud state or a quiet state based on the comparison to the loud threshold;
• and
• determining at least one sample duration of loudness in the audio signal based on the loudness flag, wherein at least one sample of the at least one sample duration in the audio signal of the media includes reverberation characteristics.

A method comprising:

• obtaining, at a media meter, an audio signal;
• calculating a loudness ratio based on sample durations of loudness in an interval of the audio signal, wherein at least one sample duration of the sample durations of loudness includes reverberation characteristics;
• and
• determining whether the interval of the audio signal includes spillover audio from spillover media content based on the loudness ratio and a loudness ratio threshold.