Abstract

The Sony PCM-601 Digital Audio Processor turns digital audio signals into a video signal and vice versa. It has analog and digital audio inputs and outputs. Because of its modest $1400 retail price and specifications that are similar to professional units, it is often used to record master tapes used to make compact disks (CDs). Its digital input and a VHS videocassette recorder's (VCR) 6-hr recording time make it appear to be an attractive device for copying CDs. Suppose that one is a serious recording collector with a library of 2000 CDs and wishes to record them onto tape for one of the following reasons: (1) one wants a backup copy in case the CD is lost or damaged, (2) one wants to play a copy of the CD in a different location, such as an automobile. The easiest solution for a wealthy collector is to buy another set of 2000 CDs (costing about $30,000). Dubbing the CDs onto analog cassette tape is time-consuming and tedious. It involves setting recording levels, bias, and equalization but is fairly inexpensive (about $400 for a good cassette deck and $4000 for 2000 tapes). Naturally, the cassette deck introduces some distortion. With each cas-

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