Detecting speech activity in real-time in audio signal

A method of for automatically detecting speech endpoints in an audio signal, the method comprising:

• receiving, by an electronic processor, a first audio signal from an audio source;
• buffering, via the electronic processor, the first audio signal;
• adding, via the electronic processor, random noise to the buffered first audio signal;
• filtering, via the electronic processor, the first audio stream to create a filtered signal;
• determining, via the electronic processor, a signal entropy of each frame of the filtered signal;
• determining, via the electronic processor, an average signal of a first plurality of frames of the filtered signal, the first plurality of frames occurring at a beginning of the filtered signal;
• comparing, via the electronic processor, the signal entropy of each frame of the filtered signal to the average signal entropy;
• and
• determining, via the electronic processor, a first speech endpoint located in a first frame of the filtered signal based upon the comparison.