|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
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
The auto fade-in / fade-out function by a digital Feder circuit are carried.
||Digital audio processor
||It is based on Electronic Industries Association of Japan (EIAJ) technical
|The number of transmission channels
||PCM of NTSC standard television signal use
||14-bit straight line quantization
|Transmission storage density
||2,643M bit per second
||90dB (emphasis on)
85dB (emphasis off)
||0.01% or less (1kHz, 0dB input)
||Correction and average value interpolation compensation with the correction
which combined 2 parity (P, Q) and CRC .
interleave combined use of 16H
|Wow and flutter
||Below a measurement limit
||VHS, beta, U-matic
||At the time of AC: 13W
At the time of
direct-current input: 9W
||Width 270x height 95x depth of 270mm