NEC AVD-700

Commentary

AV surround decoder equipped with 16-bit digital delay.

It is equipped with a 2-channel independent 16-bit digital delay developed by NEC. The characteristics are greatly improved by converting analog signals into A / D once, digitizing them and controlling them.
This circuit consists of a 16-bit linear successive approximation type A/D converter, 64kbitS-RAM, and newly developed address control IC. The AVD-700 has two circuits, which enable adjustment of delay time at every 1 msec in the range of 1 to 92 msec independently on the left and right sides.

Dolby surround sound is available. With the AVD 700, you can adjust the delay time according to the size of the room and listening point.

Equipped with a hall surround function using digital echo.
The AVD-700 uses a time-delay echo method to provide a natural feeling of presence in a concert hall. The main speaker is normal stereo playback, and the rear and front surround speakers play back a composite signal of L + R, which is the reflected sound of a concert hall, with echo added to it.
The echo delay time can be adjusted independently in 1 msec steps using the digital delay, and the echo volume can be adjusted using the echo control.

It is equipped with a matrix surround function, and a surround feeling is obtained by outputting a 2 ch signal, which is a slight mixture of left and right signals, from the front, and a signal added with a reverse phase component of the opposite ch from the rear.

Equipped with the Creation Surround function, it is possible to play back with your favorite signal processing.
This function allows you to mix the main speaker L/R with the signal of another channel in positive or negative phase, and the surround speaker L/R with the signal of another channel in positive or negative phase. You can also use digital delay and digital delay echo.

It is equipped with a mix level control function that can change the sound field by slightly mixing the signal of the opposite channel to each L/R channel.

It comes with a wireless remote control that allows you to switch the source input and surround settings, select the delay time, turn echo on/off, and adjust volume.
As a memory function, this remote control can store up to three types of positions, such as surround position, delay time, volume and invert SW.

Model Rating

Type	AV surround decoder
Surround format	Dolby Surround Hole surround Matrix surround Creation Surround
Delay Circuit
Method	16-bit linear quantization AD/DAx2ch 2 ch Independent Variable (Range 1 ~ 92 ms, 1 ms step) * When Dolby Surround is used : 15 ms ~ 30 ms
Sampling frequency	44.1kHz
Frequency characteristic	10 Hz to 20 kHz ± 0.5 dB or less
Delay time	1 ms ~ 92 ms (1 ms step variable)
<Digital>
Signal-to-noise ratio	90dB
Dynamic range	90dB
Total harmonic distortion factor	0.02%
Analog System
Signal-to-noise ratio	100dB
Total harmonic distortion factor	0.005%
Video input terminal	1Vp-p/75 Ω, Line 5
Video output terminal	1Vp-p/75 Ω, 4 systems
Audio input terminal	150mV/47k Ω, 10 systems x2ch
Audio output jacks	out1, 2 : 1V/1k Ω, 2 ch Select out : 150mV/1k Ω, 1 system x2ch
Center channel output terminal	1V/150 Ω, 2 systems
<Others>
Power consumption	33W
External dimensions	W 430x H 80x D 340 mm Up to 430 mm wide x 90 mm high x 361 mm deep
Weight	7.3kg
Attachment	Wireless Remote Control AR-700