To capture a more natural spatial impression for reproduction in typical television viewing environments, it is desirable for the sound pick-up to have many attributes of human hearing. When these features are reproduced with microphone techniques that use a precisely equalized artificial or dummy head, audio signals are available that contain most of the details that are needed for effective reproduction of spatial sound sensation. These details include diffraction around the head and torso, and the directional sensitivity with frequency of the external ear. Further enhancement and emphasis of reflections, and other environmental features of the sound impression are possible with signal processing by algorithms encoded in digital signal processing (DSP) systems. The result is a pleasing reproduction by loudspeakers or headphones of the environment in which the original program was produced, or that creates specific and desired impressions.
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