Lo-D DAD-800

Commentary

This is the second CD player whose sound quality has been improved by the comprehensive technology of Hitachi Lo-D.

Uses 3-spot type laser pickup servo.
In this servo, in addition to the main laser spot for reading the signal, two sub-laser spots for tracking error detection are arranged which are slightly shifted to the right and left. When tracking is accurately performed, the reflected light output of the two sub-laser spots is the same, but even a slight shift causes a difference in the amount of reflected light from the pit picked up by sub-laser spots 1 and 2, resulting in an unbalanced output. This enables quick detection of tracking error.

A focus signal detector is used to prevent focus errors caused by vertical misalignment caused by warping of the disc. The focus signal detector uses the characteristic that the laser light passing through a cylindrical lens changes from a vertically long ellipse to a true circle to a horizontally long ellipse.
Depending on the shape of the laser light entering the detector, if it is a perfect circle, it is judged as accurate focus, and if it is an ellipse, it is judged as focus error, and an error signal is.

Equipped with Lodio's original two dimensional objective lens drive actuators that quickly move the objective lens in response to the トラッキンエラー correction signal and focus error correction signal.
The drive part is similar to the voice coil of the speaker. By moving the lens at high speed in two directions, up and down and left and right, with respect to the correction part, accurate tracking and focus with sub-micron precision is realized.

LSIs and ICs specially designed by Lordi are used in all circuits, such as data-strobe circuits that discriminate digital signals and signal-processing circuits that detect and correct errors and rearrange signals according to their format.

The disk motors are equipped with brushless, coreless, and slotless uni-torque motors.

The analog circuits include carefully selected audio-only parts, high-quality pure focus capacitors, and 11th-order low-pass filters.

You can perform operations such as random memory music selection, direct music selection, one touch music selection, index search, manual search, and music selection cue pause.
It is also equipped with a repeat function that allows you to select all tracks, selected tracks, one track, or a section.

Output volume can be adjusted.

There was a wired remote control unit sold separately.

Model Rating

Type	CD Player
<Audio section>
Number of channels	2 Channel
Frequency characteristic	5 Hz to 20 kHz ± 0.5 dB
Dynamic range	95dB
Signal-to-noise ratio	95dB
Harmonic distortion factor	0.003%(1kHz)
Separation	94dB(1kHz)
Wow and flutter	Measurement limit (± 0.001% W. Peak) or less
<disk>
Playing time	60 minutes / one side (up to 75 minutes possible)
Diameter	120mm
Signal Format
Sampling frequency	44.1kHz
Quantization number	16-bit linear / channel
Transmission bit rate	4.3218 Mb / s
<Pickup>
Method	Objective lens drive type optical pickup
Objective lens drive system	2 d parallel drive
Light source	Semiconductor laser
Wave length	790nm
<General>
Output voltage	2.5Vrms
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	23W
External dimensions	Width 435x Height 110x Depth 264 mm
Weight	5.9kg
Sold Separately	Wired Remote Control Unit RB-800 (¥ 6,000)