Rastatter, MichaelCarter, ToddAllen, MarkRodriguez, RicardoTrainor, John2019-12-022019-12-022014-07-14US Pat# US20140186807A1http://hdl.handle.net/10342/7557Multi-user portable electronic devices for improving reading ability and/or comprehension for a plurality of subjects are provided. The multi-user portable electronic devices may include a pitch shifter circuit configured to generate frequency altered auditory speech feedback (FAF) signals corresponding to respective auditory speech signals received from respective active microphones, and to transmit the respective FAF signals to the plurality of subjects while one or more of the plurality of subjects are respectively reading aloud, to improve the plurality of subjects' reading ability and/or comprehension. The multi-user portable electronic devices may also include a switch configured to activate the microphones selectively, serially. Related methods and systems are also described.en-USeslteachingliteracyaudio feedbackPatent