What we actually need to do is to have a microphone getting the audio signal from the TV set.
At the same time we will have 2 DVD players sending audio signal.
We need to compare the audio from the microphone in realtime with the audios coming from the two DVD players.
From there on, as explained on the diagram, if the Audio coming from the microphone is the same as the audio from DVD player 1 the circuit should light LED 1
if the Audio coming from the microphone is the same as the audio from DVD player 2 the circuit should light LED 2
if the Audio coming from the microphone is neither same as the audio from DVD player 1 nor the audio from DVD player 2, then the circuit should light LED 3.
We need help on designing the circuit or if you know of any companies that can design this circuit for us.