Audio Database


178,000yen(around the 1982 time)

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.


Rating of a mode
Form Digital audio processor
System It is based on Electronic Industries Association of Japan (EIAJ) technical file
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