Patent ID: 9661434
Date: 2017-05-23
CPC Classifications: H03F,H03G,H04R

Claim:
1. A host device for use with a removable peripheral apparatus having a microphone, the host device comprising: a device connector capable of forming a mating connection with a respective peripheral connector of the removable peripheral device, the device connector having a device microphone contact; a bias source configured to generate an electrical bias suitable for biasing said microphone; a biasing path for supplying said electrical bias from the bias source to said device microphone contact; a capacitor connected between a reference voltage node and a capacitor node of said biasing path; a first switch located in the biasing path between the capacitor node and the device microphone contact, said switch being operable to disable the biasing path; detection circuitry for detecting disconnection of the peripheral connector and device connector; and a controller for controlling said first switch to disable the biasing path in response to detection of disconnection of the peripheral connector and device connector; wherein said controller is further configured to disable said bias source in response to said detection of disconnection.