�1����
Scope������������
�2����
References���
�3����
Definitions���
������� 3.1����
Terms defined elsewhere
������� 3.2����
Terms defined in this Recommendation�����
�4����
Abbreviations and acronyms��
�5����
General description����
�6����
Physical characteristics�������������
������� 6.1����
General rules�����
������� 6.2����
Pin assignments
�7����
Electrical interface specification�������������
������� 7.1����
Communication mode���
������� 7.2����
Multimedia playback (provisional, for further study)��������������
�8����
Headset specification
������� 8.1����
Communication mode���
������� 8.2����
Multimedia playback mode (provisional, for further study)���
�9����
Function requirements for terminals with the universal headset interface������
Annex A � Interpolation method for diffuse-field correction����
Appendix I � Audio connectivity for sockets with four contact points����
������� I.1����
2.5 mm diameter plug connector with four poles�������
������� I.2����
2.5 mm diameter socket connector with four contact points��
������� I.3����
3.5 mm diameter plug connector with four poles�������
������� I.4����
3.5 mm diameter socket connector with four contact points��
Appendix II � Audio connectivity for sockets with four contact points
(optional dimensions to accommodate terminal designs with curved edges)����
������ II.1����
2.5 mm diameter plug connector with four poles������
������ II.2����
3.5 mm diameter plug connector with four poles������
Appendix III � Audio connectivity for sockets with three contact
points����
����� III.1����
2.5 mm diameter plug connector with three poles����
����� III.2����
2.5 mm diameter socket connector with three contact points
����� III.3����
3.5 mm diameter plug connector with three poles����
����� III.4����
3.5 mm diameter socket connector with three contact points
Appendix IV � Other considerations����
������ IV.1����
Filter recommendation��
������ IV.2����
ESD���
������ IV.3����
Microphone basics � background���������������
������ IV.4���� Vcc
Voltage for microphone bias
������ IV.5����
DC resistance of microphone�������
Bibliography����