HHB comm CDR800 دليل المستخدم

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PRODUCT REVIEW
HHB Compact Disc Recorder
Reviewed by Gary Galo
HHB CDR-800 Professional Compact
Disc Recorder. HHB Communications
USA, LLC, 1410 Centinela Ave., Los An-
geles, CA 90025, (310) 319-1111, FAX
(310) 319-1311, E-Mail sales@hhbusa.
com; Website www.hhbusa.com.
HHB Communications is a British-based
firm specializing in digital audio record-
PHOTO 2: Rear panel of the CDR–800.
ing equipment and media for the profes-
In addition to the RCA-type analog and
sional audio industry. In addit

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PHOTO 3: A close-up view of the Pioneer Stable-Platter mechanism used in the part, the manual is clearly written, and CDR–800. The CD must be inserted up- includes numerous illustrations. Input side down, but this mechanism greatly and output connections are straightfor- reduces disc vibration and dust accumu- ward, but the rear panel also contains a lation on the laser pickup. couple of switches that you may need to reset. A three-position slide switch locat- ed between the balanced analog inpu

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tomatically generates a track number on “finalization,” which allows the CD–R to for track selection are not included on the CD. It makes sense to prepare a DAT be played on any conventional CD play- the main chassis of the CDR–800. Re- master, including all of the index points er. During this process, the absolute lead- mote-control operation can be defeated you desire, before making a CD–R. in and lead-out information for the entire with a DIP switch on the rear panel. The The CDR–800 will als

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CD–R Basics The physical structure of a CD–R disc is non-burned areas. shown in Fig. 1. The recordable CD is The most common organic dye found molded with a continuous groove spiral in CD–R disc is cyanine. Azo dye, origi- from the inside to the outside of the disc’s nally developed for types of optical polycarbonate substrate. The “pre- recording media, is also used for CD–R grooved” disc is necessary in order to discs. Cyanine and azo-based discs are provide the recorder with a physical ref- s

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PHOTO 4: Inside view of the CDR–800. Two power transformers are used, and the solid copper chassis provides excellent shielding against EMI and RFI. Balanced analog and AES/EBU digital signals enter the CDR–800 via the input PC board assembly. The balanced analog inputs are transformerless; the + and − legs of the balanced line are each fed to 5532 op amps operated noninverting as unity gain buffers. The outputs of these buffers are fed to the + and − inputs of a single 5532, converting the bala

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PD2028B Pulseflow D/A converter nect between your source and the HHB chips, which are actually stereo devices, recorder. with left and right audio outputs. To im- The dated op amps mentioned previ- prove low-level linearity, an entire chip is ously undoubtedly limit the perfor- devoted to each channel, configured in a mance of the CDR–800 when used with differential mode. The balanced outputs its analog inputs and outputs. However, from the D/A chips are fed to the ±inputs the excellent performa