A recording and/or reproducing apparatus includes an optical system arranged to form an optical image, a photo-electric conversion part arranged to convert the optical imaged into an electrical signal, an A/D conversion circuit arranged to convert the electrical signal and/or an audio signal into a digital...http://www.google.co.uk/patents/US6229954?utm_source=gb-gplus-sharePatent US6229954 - Recording and/or reproducing apparatus
