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New Modulation Technique for CD-4 Recording

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A new modulation system using a phase-locked loop was developed as a means of applying angular modulation to the carrier giving the CD-4 modulation system a wider dynamic range. Basically, two different circuits were designed and the modulators using each of the circuits had flat phase characteristics and good linearity.

JAES Volume 24 Issue 2 pp. 112-116; March 1976
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