Video: Laser/smoke microphone promises the world's most accurate sound capture

The quest for ever more realistic sound reproduction seems set to move to a whole new level. Traditional microphones convert sound to electrical signals by measuring the deflections that sound vibrations cause in a diaphragm. But each diaphragm has its own weight, inertia and resistance, which colors the sound that gets recorded. So American digital audio pioneer David Schwartz, who invented the MP3 sound format, has come up with a novel new type of microphone that virtually eliminates the microphone's mechanical interference with the sound. The laser/smoke microphone uses a laser to measure the deflections that sound makes in a steady stream of smoke - which is virtually weightless. Prepare for a new wave of high-fidelity microphone technology.

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