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Head set Jack Interface
Figure 20. Ear-Jack interface
When ear-mic set or head set plug is inserted into the receptacle, JACK_DETECT signal change from
'L' to 'H'. If hook button is pushed for a second to make a call, then HOOK_DETECT signal goes from
'H' to 'L'. Also call end has same mechanism by pushing hook button on the Ear- microphone strap.
Ordinarily detection of pushing hook button is established by signal de-bouncing for about 20ms.
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