Audio Database

The

Accuphase DP-60
270,000 yen(March, 1990 release)

Description

CD player which introduced the technology cultivated by DP-80 L/direct current-81L, and was developed.

An IC type 18-bit D/A converter is selected carefully and adopted as a D/A converter.
Since bit accuracy can be adjusted in order that this converter may improve the engine performance to a limit, taking advantage of this advantage, all the products were adjusted in the product line, and the marginal engine performance has been realized.
With emphasis on realizing accuracy of 18 bits completely, the stability and long-term stability over environmental change of temperature etc. are investigated thoroughly, and it is endeavoring pulling out the marginal engine performance.

The oversampling digital filter is adopted as a digital filter 8 times, and the amount of attenuation for 24.1-328.7kHz is oppressed on the level of -110dB.
Moreover, pass band Rippl leading to sound quality degradation is less than ±0.00005dB, and has become a filter of that time highest level.

In the audio low pass filter, it constituted from a 3rd discrete GIC Butterworth active filter which selected the element carefully, and sound quality serious consideration is designed.

A digital signal part and analog circuitry are electrically separated by the optocoupler.
It is an ultra high-speed type with 40 Mbit/sec throughput, and dissociates completely electrically, using this four per channel, and the optocoupler is performing faithful signal transmission by light.
Furthermore, in order to prevent a noise invading through a power-source part, the power transformer of digital one and analog circuitry is made to become independent, respectively, and is considered as 2 transformer composition. In order to raise the audio characteristic, the winding wire of the analog transformer is right-and-left independence.
Moreover, in order to prevent a high frequency noise ingredient's interfering in static electricity through space, and interfering as electromagnetism, each circuit is completely shielded on the thick metal plate.

The linear motor mechanism is adopted as the tracking of a laser pickup.
It controls by the 8-bit microprocessor developed for exclusive use, and smooth song selection is enabled at the speed for about 1 second.
Moreover, operation of the disc table is controlled by the microprocessor to brew a soft feeling.

A mechanism main part is mounted on an aluminum die-casting frame, and resonance is prevented, and also floating is carried out from a chassis, and transfer of vibration is intercepted.
Floating was carried out also to the disc table by this, and the vibration from the outside to a mechanism main part is stopped to the minimum.
Moreover, strengthening is carried out to vibration by supporting a mechanism main part with a thick metal chassis.
By considering it as strong frame structure at the whole, stable operation also with little [ strongly ] sound quality change to resonance by the sound pressure and the place to place from a speaker is realized.

The noise shaper is carried in order to decrease quantization noise further.
A noise shaper returns an error to the following data in the slight roundness which a digital filter generates, says that the noise in an audio frequency band is decreased with the technique of reducing a noise, and is reducing the re-quantization noise.

In order to correspond to CD in which the emphasis was applied, the digital demphasis which changes the characteristic in the state of a digital signal is adopted.
This has realized the characteristic of the deflection of ±0.001dB, and less than 1.5 phase difference to the predetermined characteristic.

In the audio stage, it sets up so that there may be no necessity for magnification of the output of a converter, and amplifier is considering it as direct-current servo direct connection system of only a buffer, and is raising SN and the distorted characteristic.

Volume control of a digital system is carried taking advantage of the advantage of 18 bits.
Thanks to a 2-bit margin, also where volume is extracted, there is little sound quality degradation and it can be performing the ideal level control.
The variable range can be adjusted with a remote commander by 0--24dB.

The output terminal carries one balanced two RCA phono jacks and XLR type output in the analog system, and especially the balanced output meets balanced transmission-ization of all the magnification systems which the Accuphase is promoting.
Moreover, a digital output is advocated based on a digital audio interface, and the optical fiber and 75-ohm coaxial output which were enacted by the EIAJ standard are carried. An optical transmitter improves pulse width distortion and a Jitter, and enables good transmission.

It is made for a timer to be interlocked with, and if a power source is turned on, the power-on play function which starts a performance automatically is carried.

Wood Bode of a natural persimmon is employed as both sides.


Internal
D/A
Mechanism
8-bit Attached
Digital

Rating of a mode
Form The digital signal playback machine only for CD
Format CD standard format
The number of quantization: 16 bits
Sampling frequency: 44.1kHz
Error correcting system: CIRC
The number of channels: Two channels
Number of rotations: 500-200rpm (CLV)
Performance speed: 1.2 - 1.4 m/s regularity
Reading system Non-contact optical reading (semiconductor laser use)
Laser GaAlAs (it is a terrorism diode to double)
Frequency response 4.0Hz-20000Hz±0.3dB
D/A converter Rudder resistance type 18 bit
Digital filter 8 time oversampling
Noise shaver function
Digital demphasis function
Deflection of ±0.001dB
THD + noise 0.002% (for 20Hz - 20000Hz)
S/N 114dB
Dynamic range 98dB
Channel separation 106dB
An Output power/Output load impedance Balanced: 2.5V/50 ohm (25ohm/25ohm), a balanced XLR type
Unbalanced: 2.5V/50 ohm, a RCA phono jack
Digital level control: For 0 - -24dB, a 1dB step
Digital output format level Format: Digital Audio Interface
Optical:optical power: -21 - -15dBm (EIAJ), and luminescence wavelength:660nm
Coaxial: 0.5 Vp-p/75ohms
The semiconductor used Transistor: 15 pieces
IC: 46 pieces
Diode: 26 pieces
Power source 100V/117V/220V/240V, 50Hz/60Hz
Power consumption 20W
Dimensions the width 475x height 115(piece -- it includeds) x depth of 325mm
Weight 14.5kg
Attachment: Remote commander RC-4
Remote control system Infrared pulse system
Power source DC 3V
Battery SUM-3 (an IEC name, R6), two pieces
The maximum Dimensions Width 64x height 176x depth of 18mm
Weight 180g (Battery included)