Patent ID: 9490765
Filing Date: 2016-11-08
CPC Classification: H03F,H03G,H04R

Claim Text:
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 biasing path for supplying, in use, an electrical bias from a bias source to said device microphone contact; an input path for supplying, in use, an input signal from said device microphone contact to input circuitry; a first switch located in the biasing path and not in the input path, said first switch being operable to disable the biasing path; a second switch located in the input path and not in the biasing path, said second switch being operable to disable the input path; detection circuitry for detecting disconnection of the peripheral connector and device connector; and control circuitry for controlling said first and second switches in response to detection of disconnection of the peripheral connector and device connector.