Audio Database

Image of the P-D70
Commentary

This is a second generation CD player developed by taking advantage of optical technology cultivated in laser discs and the latest digital technology.

It is equipped with an in-house developed pickup utilizing the know-how accumulated in the development of optical video disc players.
The pickup drive employs a focus parallel drive mechanism in which multiple magnetic circuits and multiple coils are placed in a straight line between objective lenses. This increases the sensitivity of the drive system and enables high-precision and high-speed search.
In addition, the pickup suspension adopts a cross-parallel suspension system that clearly separates the suspension support system of focus tracking to improve signal reading accuracy.

The signal processing circuit is equipped with a newly developed LSI consisting of two chips, which greatly contributes to miniaturization and low power consumption, and realizes stable disk rotation control.
The error correction of the P-D70 has the error detection and correction capability of double C1 error detection and correction and triple C2 error detection and correction, which enables accurate recovery from dropouts of up to 12 frames.

The analog section is equipped with a newly developed 11th-order low-pass filter enclosed in a copper cap. High-performance parts such as high-sound resistance for high-wage audio equipment, polypropylene and mica capacitors, and 70 μ m copper foil printed circuit board are used.
In addition, the power supply section uses an independent winding exclusively for audio.

A horizontal front loading system is used for disk mounting.

The display uses a pure digital signal display monitor with binary display and peak display.
In binary mode, the change in the upper 12 bits of the 16-bit PCM signal read from the disk except for the sign bit is directly displayed. Since each bit has a weight of 6 dB, it is possible to see a signal level change of 72 dB (-54dB to + 18 dB).
When the level meter switch is switched to the peak mode, a peak meter of 4 dB per dot is used for differential operation.
The display range is -32dB to + 12 dB.

Track search, Min/Index search, slow scan, memory stop, program play, repeat playback between one track / all tracks / two points, etc.

Subcode output terminal and wired remote control terminal are mounted.

Model Rating
Type CD Player
Disk used Diameter : 120 mm
Thickness : 1.2 mm
Maximum playback time : 60 minutes or more (in stereo)
Linear velocity : 1.2 ~ 1.4m/sec.
Rotation Direction (Reading Plane) : Counterclockwise
Sampling frequency 44.1kHz
Number of quantization bits 16-bit straight line
Transmission bit rate 4.3218Mbit/sec.
Modulation system EFM
Error correction method CIRC
Preemphasis 50/15 μ sec.
Laser used Semiconductor laser (wavelength 0.78 μ m)
Frequency characteristic 5 Hz to 20 kHz ± 0.5 dB
SN ratio (1 kHz) 95 dB or more
Dynamic Range (1 kHz) 95 dB or more
Channel Separation (1 kHz) 90 dB or more
Wow and flutter Crystal accuracy
Distortion Factor (1 kHz, 0 dB) Not more than 0.004%
Output Voltage (1 kHz, -20dB) 200mV
Headphone out 36mW/32 Ω
Number of channels 2 channels (stereo)
Pwer 100 VAC, 50Hz/60Hz
Power consumption 27W
External dimensions Width 420x Height 98x Depth 300 mm
Weight 7.5kg