Tone detector and method used in a robot for detecting a tone

摘要

A tone detection device for detecting whether an input signal having a tone. The device includes a volume gain calculation unit performing a volume gain treatment on frame data and outputting the volume-gain-treated frame data and energy in time domain thereof, a threshold calculation unit calculating a threshold value on the basis of the energy of the volume-gain-treated frame data, a filter transforming the volume-gain-treated frame data by an algorithm and outputting a characteristic value in a first period, and a comparator comparing the first characteristic value and the threshold value to generate a result and determining the frame data of the input signal has the tone on the basis of the result.