Audio Database

The

DIATONE D-102
178,000yen(around the 1982 time)

Description
 
The digital audio processor which can enjoy a digital audio on a videocassette only by connecting with a home videocassette recorder.

EIAJ system digital audio processor of No. 1 announced by D-102 in 1979 No returning type active filter carried also in D-1 is carried. Furthermore, in D-102, the sound quality improvement is realized by adding improvement to this returning type active filter of no, and carrying out selection and a miniaturization of a condenser.

The newly developed simple deglitch circuit is adopted as the deglitch circuit which removes the Glitch signal generated at the time of the D/A conversion in play mode. Degradation of the mid-high range by CR integration circuit and the high-speed operational amplifier which this had generated in the conventional analog switch, CR integration circuit, and the circuit that consisted of high-speed operational amplifiers is suppressed.

What was fully examined is adopted as the part used for analog circuitry and a power supply circuit.
Resistance uses only a tantalum system and the condenser is also using the Copper-foil styrene capacitor, the film capacitor for sound, etc. according to operation and the function of each part of a circuit based on the electrolytic condenser for sound with the most sufficient energy balance.
Moreover, pure copper and a copper-coating article are used for a case, a screw, and wiring material, and only what has the best balance is used on the characteristic, such as adopting a low return capacity operational amplifier further.

By forming the digital circuit itself into low power consumption, improvement in sound quality and power supply circuit built-in are realized.
In LSI-izing a digital circuit, in D-102, the C-MOS type which receives the conventional N-MOS type and has the strong point of low power consumption is adopted. Moreover, the C-MOS type is adopted also as 16 k-SRAM for wow and flutter removal, and an 8-bit 1-chip microcomputer. This has realized low power consumption not more than 0.5W to N-MOS type power consumption being 3-4W.

The CCVR (Current Controlled Voltage Regulator) power supply circuit developed by the basis of the basic philosophy of "a power supply circuit suitable to a digital audio" is carried in the power-source part. Thereby, the signal to noise ratio of about 30dB of a power-source output is improved, and no condenser is used for a power-source line.

The auto fade-in / fade-out function by a digital Feder circuit are carried.

No

Rating of a mode
Form Digital audio processor
System It is based on Electronic Industries Association of Japan (EIAJ) technical file
sensitivity-time-control-007.
The number of transmission channels Two channels
Modulation method PCM of NTSC standard television signal use
Sampling frequency 44.056kHz
Quantization 14-bit straight line quantization
Transmission storage density 2,643M bit per second
Frequency response 10Hz-20kHz±1.0dB
Dynamic range 90dB (emphasis on)
85dB (emphasis off)
Distortion 0.01% or less (1kHz, 0dB input)
Emphasis 50microS, 15microS
Dropout compensation Correction and average value interpolation compensation with the correction mark
which combined 2 parity (P, Q) and CRC .
Word interleave combined use of 16H
Wow and flutter Below a measurement limit
Conformity VTR VHS, beta, U-matic
Power consumption At the time of AC: 13W
At the time of direct-current input: 9W
Dimensions Width 270x height 95x depth of 270mm
Weight 3.3kg