Description
NEC Compact Disc Player Audiofile 1987 Model CD-810 w original remote Super Nice. Everything works as it should More info: There are a number of unusual operational features as well. Of these, the most striking are certainly the editing modes used for making cassette dubs of CDs. In the automatic editing mode, you use the keypad to punch in the time available on each side of the cassette (45, for example, to stipulate one side of a C-90). The CD-810 programs itself for all of the tracks, beginning at the first track and continuing until there's not enough time left for the next unprogrammed track. If you press the editing button a second time, the player will program the second side, beginning where the first left off and inserting a pause between sides in the sequence, to give you time to turn over the cassette. If you already have something recorded on Side A of the tape, you can set the player to program for just the remaining time on that side, then the full time on Side B. If you don't want to start at the beginning of the disc, you can cue up the track you want to start with before beginning automatic programming. You can also use a manual editing mode and program the sequence yourself in any order. As you do, the display keeps track of the time still available on the tape so you can tell which tracks will fit and which won't. When the editing is done, you simply start the recorder and the 810 together. For programmed playback only (without taping), a 24-selection memory is provided. Also unusual, though without the obviously broad application of the editing functions, is timer search. When this function is invoked, the keypad can be used to stipulate an elapsed time from the beginning of a track to the point at which you want playback to begin. This function is available only via the supplied AR-810 wireless remote control. So is the polarity-inversion function, though activation of both functions is indicated by pilot lights on the player's front panel. The remote, which is powered by two AA cells, also incorporates basic transport controls (even an open/close for the disc drawer) and those for the memory-playback and repeat functions. The no nonsense quality that characterizes NEC designs is much in evidence in the CD-810. It's a solid performer that is dignified in both styling and behavior. The features appear to have been soberly considered, and, despite the unusual nature of some of them, the impression is not one of glitziness. Also typical of NEC-which is as well known for its sophisticated integrated circuits and computers as it is for home entertainment components- are the high-tech touches with which it seeks an ever-closer approach to sonic perfection. Of all these touches, NEC seems most proud of its proprietary output filtering system. Two filters are involved: In the digital domain, there is a 73-tap ND (non-delay) filter, which is supplemented by an FDNR (frequency-dependent negative resistance) low-pass filter. (Impressive as it sounds, FDNR is just a way -uncommon in audio-of hooking up common operational amplifiers, resistors, and capacitors into a filter circuit.) The filters, in combination with two-times oversampling and dual digital-to-analog converters, are credited with exceptional accuracy in waveform reconstruction. Similarly high-tech is the optical internal coupling that helps minimize the possibility of interference between analog and digital sections, as do the separate power supplies for the digital and analog sections. The CD-810 also is among the NEC models incorporating a phase-inverter (or polarity-inverter) switch so you can maintain absolute phase even when the recording-or the remainder of your system-flips it. This, however, presumes that either you can discern an audible difference between polarities and can tell which setting is correct (not easy) or that you have some previous knowledge of the polarity of the original recording.
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