5. A dual earpiece, comprising: a first earpiece comprising: a first Ambient Sound Microphone (ASM) configured to measure a first ambient sound, and a first Ear Canal Microphone (ECM) configured to measure a first internal sound in a first ear canal; a second earpiece comprising: a second Ambient Sound Microphone (ASM) configured to measure a second ambient sound, and a second Ear Canal Microphone (ECM) configured to measure a second internal sound in a second ear canal; a processor operatively coupled to the first earpiece and the second earpiece, where the processor is configured to detect a spoken voice generated by a wearer of the dual earpiece based on a non-difference comparison of at least one of the first and second ambient sounds and at least one of the first and second internal sounds, where the spoken voice of the wearer is detected when the non-difference comparison is greater than a threshold; and a voice operated control (VOX) configured to mix a first signal and a second signal to produce a mixed signal and control production of the mixed signal based on one or more aspects of the spoken voice, the first signal including at least one of the first and second ambient sounds, the second signal including at least one of the first and second internal sounds, wherein the VOX is configured to increase a first gain of one of the first signal and the second signal and decrease a second gain of a remaining one of the first signal and the second signal, such that the mixed signal includes a combination of the first signal and the second signal, and wherein the non-difference comparison is at least one among a correlation, a cross-correlation and a comparison that uses coherence.
7. The dual earpiece of claim 5 , wherein the VOX receives the first ambient sound from the first earpiece and the second internal sound from the second earpiece for controlling the mixing.