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Meanwhile, Sony first publicly demonstrated an optical digital audio disc in September 1976.

In September 1978, the company demonstrated an optical digital audio disc with a 150 minute playing time, 44, 056 Hz sampling rate, 16-bit linear resolution, and cross-interleaved error correction code — specifications similar to those later settled upon for the standard Compact Disc format in 1980.

Technical details of Sony's digital audio disc were presented during the 62nd AES Convention, held on March 13 – 16, 1979, in Brussels.

Just before that, on March 8, 1979 Philips publicly demonstrated a prototype of an optical digital audio disc at a press conference called " Philips Introduce Compact Disc " in Eindhoven, Netherlands.

Thirty years later, on March 6, 2009, Philips received an IEEE Milestone award with the following citation: " On 8 March 1979, N. V. Philips ' Gloeilampenfabrieken demonstrated for the international press a Compact Disc Audio Player.

The demonstration showed that it is possible by using digital optical recording and playback to reproduce audio signals with superb stereo quality.

This research at Philips established the technical standard for digital optical recording systems.