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| NEC AVD-700 |
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| 125,000yen(around the 1986 time) |
audio-video surround decoder which carries a 16-bit
digital delay.
The 2ch independent 16-bit digital delay which NEC was
original and developed is carried, and the property is sharply improved by
carrying out AD conversion of the analog signal once, and digitizing and
controlling it.
This circuitry consists of a 16-bit linear-line
successive-approximation-type analog-to-digital converter, 64 kbitS-RAM, and an
IC for a newly developed address control, and is carried two lines by AVD-700.
Thereby, the coordination of the delay time for every msec is enabled in the
span of 1 - 92msec by the right-and-left independency.
Dolby surround is
supported. In AVD-700, delay time can be adjusted according to the magnitude and
listening point of the room.
The hole surround functionality by a
digital echo is carried.
In AVD-700, in order to obtain the natural presence
of a concert hall, the way of using a time delay echo is adopted and a main
speaker is the usual stereophonic reproduction,From back or a front surround
speaker, what applied the echo to the composite signaling of L+R which is the
reflective sound supposing a concert hall is reproduced.
Echo delay time can
be adjusted with a digital delay independently at 1msec step, respectively, and
the amount of echoes (the amount of echoes) can be adjusted by echo control.
The matrix surround functionality is carried, it is outputting the signal
with which a front to rear and others added the negative phase component
of opposite ch for 2ch signals which mixed a little signal on either side,
and a feeling of surround has been obtained.
It is possible to carry the creation surround functionality, to add one's
favorite signal processing, and to reproduce.
In this functionality, other ch signals of a
right phase or negative phase are mixable with mixing the signal of other ch(es)
of a right phase or negative phase with main speaker L/R, and surround speaker
L/R. Furthermore, it is also possible to apply a digital delay and a digital
delay echo.
The mix level-control functionality in which sound field can
be changed by mixing a little signal of opposite ch with each L/R ch is carried.
The wireless remote control in which a source input, a switching of each
surround, a delay time selection, on/off of an echo, and a coordination of a
volume are possible is attached.
It is possible to make positions, such as a
surround position, delay time, a volume, and Invert SW, memorize to three kinds
as a memory functionality with this remote control.
|
.JPG) |
.JPG) |
| Form |
audio-video surround decoder
|
| Surround synopsis |
Dolby surround
Hole surround
Matrix
surround
The CLIE イション surround |
| <Delay circuit>
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| Scheme |
16-bit linear-line quatization AD/design
aidx2ch
A 2ch independent variable (the span of 1 to 92ms, 1second step)
* At the time of a Dolby surround using : 15ms - 30ms |
| Sampling frequency |
44.1kHz |
| Frequency characteristic |
Less than [ 10Hz-20kHz±0.5dB ]
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| Delay time |
1ms - 92ms (1ms step variable)
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| <Digital system>
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| SN ratio |
90dB |
| Dynamic range |
90dB |
| THD |
0.02% |
| <Analog system>
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| SN ratio |
100dB |
| THD |
0.005% |
| Video input terminal |
1 Vp-p/75 ohms, five lines |
| Video output-terminal |
1 Vp-p/75 ohms, four lines |
| Audio input terminal |
150mV / 47kohm, ten line x2ch
|
| Audio output-terminal |
out1 and 2:1V/1kohm, 2ch
selector out:
150mV / 1kohm, one line x2ch |
| Center ch output-terminal |
1V/150 ohm, two lines |
| <Others> |
| Power consumption |
33W |
| Dimensions |
The width 430x height 80x depth of 340mm
The width 430x height 90x depth of 361mm (maxima) |
| Weight |
7.3kg |
| Adjunct |
Wireless remote control AR-700
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