Constant volume output method based on automatic gain

The invention discloses a constant volume output method based on automatic gain. The constant volume output method comprises the following steps that S1, a microphone receives a sound signal; S2, vadhuman voice judgment: discarding the non-human voice data, and reserving the human voice data; S3, agc human voice gain is carried out; S4, ns noise reduction is carried out; and S5, the output deviceoutputs the processed sound signal. According to the method, under the condition that input equipment and output equipment are freely selected, noise reduction and human voice detection are carried out on audio input by the input equipment. Under the condition that the human voice exists, the input human voice is gained to the set volume, and when the input human voice volume is small, the inputhuman voice volume is increased. And when the input human voice volume is large, the volume is reduced, and the volume output by the human voice is always gained to the same size, so that the call quality is improved. 本发明公开了一种基