Methods and apparatus to determine headphone adjustment for portable people meter listening to encoded audio streams

A non-transitory computer readable medium comprising instructions that, when executed by a computing system, cause the computing system to at least:

• determine an audience estimate for streaming media based on media data measured by a media meter, the media meter to measure the streaming media based on an identification of the streaming media in ambient audio collected by a microphone of the media meter;
• calculate at least one headphone adjustment factor based on a first determined proportion of an audience that listens to streaming media via headphones and a second determined proportion of the audience that listens to streaming media without headphones;
• apply the at least one headphone adjustment factor to the audience estimate for streaming media, wherein application of the at least one headphone adjustment factor generates a headphone-use-adjusted audience estimate that accounts for presentation of the streaming media that is not accounted for by the media meter collection of ambient audio due to headphone usage;
• and
• report the headphone-use-adjusted audience estimate.

A method comprising:

• determining an audience estimate for streaming media based on media data measured by a media meter, the media meter to measure the streaming media based on an identification of the streaming media in ambient audio collected by a microphone of the media meter;
• calculating at least one headphone adjustment factor based on a first determined proportion of an audience that listens to streaming media via headphones and a second determined proportion of the audience that listens to streaming media without headphones;
• applying the at least one headphone adjustment factor to the audience estimate for streaming media, application of the at least one headphone adjustment factor generates a headphone-use-adjusted audience estimate that accounts for presentation of the streaming media that is not accounted for by the media meter collection of ambient audio due to headphone usage;
• and
• reporting the headphone-use-adjusted audience estimate.