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The larger video drum used for the Beta format permitted Sony engineers to modify the video signal and insert some extra information. The result was revolutionary Betahi-fi stereo. The graphic above is a reproduction of a Sony literature piece that gives an overview of its technology and stellar performance. The other format couldn't match Betahi-fi because of the their smaller signal, so to try and match it they developed an imbedding and overwriting system. It requires two extra heads to yield similar, but less impressive, results. To open a technical review of Betahi-fi click here.