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Phase Delay Network for 3D Audio Enhancement (1N4733A)

2016-01-04 20:17  
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3D enhancement is needed to create a fully 3-dimensional sound for most stereo multimedia products. Usually, simple phase-delay circuits is used to produce a widening effect on the perceived sound field. However, there is transaural acoustic crosstalk effect. The following figure shows transaural acoustic crosstalk effect and schematic diagram of simple phase-delay circuits :
Phase Delay Network for 3D Audio Enhancement circuit schematic
Transaural acoustic crosstalk effect is a condition where some sound from the right-hand stereo speaker reaching the left ear, and vice-versa.

This is an active circuit that uses first-order section to present a phase-shift filter with ft of 1kHz for the quadrature signal? and ft = 10kHz for the linear signal. It will produce 90° phase shift between the quadrature and linear signals over the audio bandwidth of 1kHz to 10kHz.

This article describes the Phase Delay Network for 3D Audio Enhancement (1N4733A). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components:1N4733A.



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