Personal People Meter PPM in the headset of a MP3 portable media player.

• 1. 一种便携式网络通讯MP3媒体播放器 [P] . 中国专利： CN2904112Y . 2007.05.23
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• 3. Portable People multimedia audience Meter PPM using eavesdropping of the bluetooth interface of a smartphone headset. [P] . 欧洲知识产权局专利： EP2261927B1 . 2017-12-13

  机译： 通过窃听智能手机耳机的蓝牙接口，Portable People多媒体听众可以测量PPM。

• 4. AUDIO METER IN A PORTABLE MP3 MEDIA PLAYER HEADSET. [P] . AT478485T . 2010-09-15

  机译： 便携式MP3媒体播放器耳机中的音频表。

• 5. Portable People multimedia audience Meter PPM using eavesdropping of the bluetooth interface of a mobilephone earpiece. [P] . 欧洲知识产权局专利： EP2261927A1 . 2010-12-15

  机译： 通过窃听手机听筒的蓝牙接口，Portable People多媒体听众可以测量PPM。

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