Patent ID: 9456272
Filing Date: 2016-09-27
CPC Classification: H04R

Claim Text:
1. A button-press detection circuit, comprising: a filter circuit configured to digitally sample a button-press signal from a button on a wire-control apparatus of an external device, to determine a pressed button on the wire-control apparatus using the digital sample, and to provide a digital logic signal to cause an audio codec to perform a function corresponding to the pressed button, wherein the filter circuit includes: a comparator sampling circuit configured to compare a reference voltage to a voltage of the button-press signal; a sampling result register having a sampling rate, the sampling result register configured to receive an output of the comparator sampling circuit and to provide a count result using the output of the comparator sampling circuit and the sampling rate; and a logic processing circuit configured to determine the pressed button according to the count result and to output the digital logic signal corresponding to the pressed button.