Patent ID: 9214163
Filing Date: 2015-12-15
Classification: G10L,H03G

Abstract:
1. A speech processing apparatus, comprising: a microphone configured to receive a speech signal; an analog/digital converter configured to convert the speech signal generated by the microphone into a digital speech signal; and an automatic gain controller configured to calculate an average value of the magnitude of the digital speech signal generated by the analog/digital converter in a plurality of frames, where the number of frames is predetermined, determine in which region of a speech signal band the average value is located, the speech signal band being divided into a plurality of regions according to a strength of speech based on a dynamic range of the microphone, and adjust gain according to a corresponding one of the plurality of regions to which a location of the average value belongs so that the strength of speech has a level of an optimal region where the speech signal is capable of being processed, wherein the speech signal band is divided into a plurality of regions based on a minimum limit capable of being detected by the microphone, a maximum limit level capable of being detected by the microphone, low and high levels of the optimal region, and a median point of the speech signal band.