ONKYO CD PLAYER R1 FULL
ONKYO CD PLAYER R1 SERIES

The test indicates the rapidity with which a player's error-correction system can 'reset' itself after having performed a correction. The successive-dropout tests consist of two signal interruptions of the same size, separated by an equivalent space. The results were the same with the closer-spaced tracks which followed: clicks were occasionally audible at 2mm, and muting set in at 2.4mm. At 2.5mm, there was intermittent mutingindicating the limit of the player's interpolation capability. The R1 did not quite achieve the ideal at 2mm, there were occasional bursts of 1rpm clicks, and at 2.4mm, the clicks occurred once for every disc revolution.

ONKYO CD PLAYER R1 FULL

The CD standard calls for the ability to fully correct a data loss of up to 0.2mm across, but the Cross-Interleaved Reed-Solomon Code used for CD error correction allows, theoretically, for full correction of dropouts of up to 2.4mm across. The error-correction tracks on the Verany disc have 'blemishes' ranging from 0.05 to 4.0mm across. Nonetheless, the P-V disc serves well enough as a standardized test for comparing one player with another. The effect is not quite the same, though: while interruptions at the disc surface are subject to defocusing by the optical system, and are thus 'seen' as having indefinite boundaries, the laser-simulated 'blemishes' are sharply focused and have 'hard' boundaries.

The next four tracks contain simulated dropouts, similar in test function to those of the Philips 5A test disc but differing in that, while the Philips disc has the blemishes applied to the disc surface, the P-V used instead interruptions of the laser cutting beam to produce essentially the same interruptions in the recorded pit patterns.

On the first P-V tests, 23 tracks cover the variations in pitch (spacing) and linear velocity of the data tracks which are permitted by the CD specifications 'red book.' The R1 sailed through all of them without a glitch. And it probably helped that Sony used this same test disc for evaluating the performance of their R1. But then Sony CD players have long had a reputation for unequalled tracking and error-correction capabilities. Details:Īccording to Verany's instructions (which are another hilarious example of what I call Finglishforeign English, sort of like generic Japlish), it is unlikely that any player could do as well on these as the Sony did. Some of these gave the R1 a real workout, and the fact that it failed some of the most demanding ones (ones that no other player would probably track, either) allowed me to quantify some of its limitations. The Pierre Verany disc contains tests that no other CD test discs have: tracks to test for a player's ability to cope with normal and abnormal variations in signal-track speed and spacing, ill-defined pit-to-land transitions, and the triple-threat challenge of two dropouts occurring in quick succession. It consists of a progression of the codewords representing ≡, 0, and +1), though some asymmetry was visible in that the positive-going step was smaller than the negative-going.įig.2 Sony DAS-R1, waveform of undithered 1kHz sinewave at ≩0.31dBFS, 16-bit data. The undithered waveform at this level had an almost perfect three-step shape (fig.2). Measured departure from linearity at very low levels was the best John Atkinson (who did the testing) has seen: within the experimental error limits, down to ≨0.77dB ( ie, perfect), and between 0.5dB and 2dB of compression at ≩0.31dB ( ie, effectively perfect). (Note that ≡00dB is 4dB below the theoretical dynamic-range floor of a 16-bit system proof that dither does what it is claimed to do.) The dithered ≡00dB track was (as always) very hissy, but the 1kHz tone was still clearly audible.

With the R1, the undithered ≨0 track had perceptible even-harmonic content and the ≩0 track had noticeably more, but there was virtually no perceptible buzzing, indicating God-knows what.

Nearly every player I have tried them on has produced severe harmonics and/or buzzing from the undithered ≨0 and ≩0 tracks, and most were incapable of producing a recognizable pitch from the ≡00dB dithered signal it became undifferentiated hiss.

ONKYO CD PLAYER R1 SERIES

The CBS has several series of 1kHz tones of diminishing level, down to ≩0dB and below, with and without dither added. The R1 fared very well on both the CBS CD-1 and Pierre Verany PV.788031/788032 test discs.

Onkyo cd player r1