What did Alan Blumlein invent while working at EMI that established groundwork for high-quality distributed sound?

Answer

Stereo sound reproduction

Alan Blumlein is credited with creating stereo sound reproduction, a significant advancement in audio fidelity. His patented work involved developing the concept of two independent audio channels. The purpose of this dual-channel setup was to create a more realistic, spatial sound field for the listener, involving principles of stereophony and cross-fed signals. While this invention focused on achieving depth within a single listening area rather than breadth across an entire house, it fundamentally raised consumer expectations regarding the quality and immersion achievable in home audio systems, thereby setting the stage for the subsequent demand for whole-house systems capable of carrying that high-quality signal.

What did Alan Blumlein invent while working at EMI that established groundwork for high-quality distributed sound?

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