Audio Database


Marantz CD-73 210,000yen(1983 release)

The compact disk player of No. 2 developed as a high order model of compact-disk-63.

The micro mechanism which drives an original micro laser pickup by a linear motor is carried in the pickup part.

The linear skating mechanism is adopted as a disk applied part, the whole disk tray part is drawn out by the switchpoint, a disk is arrived, and it is fixed by an original disk clamp scheme.
By this disk clamp scheme, the precision manipulation spindle and the original magnet disk clamper have realized the positive hold.

The original full balance type swing scheme mechanism is adopted as a mechanism.

Two sets of 8-bit microcomputers are carried, and servo system, the special-NetWare-program system, and the control system are controlled.

The error collection circuitry of a development is adopted specially and high error-correction capacity is acquired.

Digital filter LSI is carried and the influence on the audio frequency band which is not avoided is suppressed in the usual multi-stage analog low pass filter.

The I2CBus scheme is adopted as the communications between a display device, key search, and a microcomputer etc. Thereby, since two sets of microcomputers can process efficiently the functionality which each became independent of, it is possible to be able to turn toward a servo control required for a high-quality sound play in the greater part of the capacity.

Mechanism Pickup

Rating of a mode
Form Compact disk player
Sampling frequency 44.1kHz
The number of quatizations 16-bit linear
Modulation technique EFM
Channel bit rate 4.3218Mb/sec
Error correcting system CIRC
Encode scheme Two's complement
Semiconductor laser wavelength 0.78 micrometer
Numerical aperture (NA) 0.45
Depth of focus ±2 micrometers
The diameter of the beam spot (disk top layer) About 1mm in diameter
Output 2.0V
Play frequency band 5Hz - 20kHz
S/N ratio 90dB or more
Dynamic range 90dB or more
Channel separation 90dB or more
THD (1kHz) 0.004%
Wow and flutter Quartz-crystal precision (below a limit of measurement)
De-emphasis Automatic switching
Power source AC100V, 50Hz/60Hz
Power consumption 30W
Dimensions Width 416x height 81x depth of 300mm
Weight 8kg
Adjunct Disk x1
Low capacity pin code x1