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TEST REPORT

02-03/2010

JiuzhouDVE-4QExcellentMPEG-2 encoderforuseinlocal

cableorterrestrial networks

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2/441www.TELE-satellite.com 02-03/2010 TELE-satellite Global Digital TV Magazine

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42 TELE-satellite Global Digital TV Magazine 02-03/2010 www.TELE-satellite.com

Transport stream generated at 720x576 resolution and high bitrate

Transport stream generated at 352x576 resolution and high bitrate

Transport stream generated at 704x480 resolution and high bitrate

Transport stream generated at 720x576 resolution and low bitrate

Setting the channel bitrate

Instrument specification

reveals that the input can be

either in PAL or NTSC system

the encoder will adjust to it

automatically. There are two

output BNC connectors but

with exactly the same signal.

This is where the transport

stream is output. So, if nec-

essary, you can connect two

modulators to the encoder

or a modulator and transport

stream analyzer.

Except for the inputs and

outputs, there are RS-232

and Ethernet interfaces as

well as power socket and

switch on the rear panel.

Interesting that there is no

cooling fan. Quick check in

the user manual revealed that

the device consumed only

30W so the same amount as

a regular satellite tv receiver.

No wonder a cooling fan was

not embedded. The encoder

we received for test was dedi-

cated for 220 V 10% mains

voltage and ambient temper-

ature 540 C. The manufac-turer recommends assuring

good ventilation for the unit

and considering air condition-

ing of the entire room. Indeed,

the headend stations are usu-

ally chock full of different

stuff and taking care of good

ventilation is a must.

InstallationAfter power up, the instru-

ment initialize itself whatlasts about 40 seconds, then

it shows software and hard-

ware version. You can press

now OK button to enter the

main menu. The menu con-

sists of four items: channel

settings, multiplex settings,

system settings and check

the warning information.

Arrows up/down are used to

switch between menu items,

OK enters the item.

Channel settings menu is

used to set proper param-

eters for each A/V input. You

can choose between: Auto,

PAL or NTSC. Next item allows

you to set the sequence of I,

B and P frames in the GOP

(Group of Pictures): IP, IBP

or IBBP. Then, you can adjust

luminance, contrast, satura-

tion and hue for the input in

the next 4 submenus. In this

way, you can compensate for

imperfections of the incoming

analog signal. Those values

are set either in the range of

0 to 255 or from 0 to 128 (for

hue).

Although it may look dif-

ficult at the very beginning,

changing the numerical

values is in fact quite simpleand fast. Left/right arrows

are used o change the digit,

while up/down to increase/

decrease the digit. However,

if the input signal is good and

does not require corrections,

the best idea is to leave the

factory defaults.

The further submenus in

the channel settings are more

digital in nature. These

are: picture resolution, audio

sampling rate, audio output

bitrate. The available video

resolutions are: 720x576,

704x576, 640x576, 544x576,

480x576, 384x576, 352x576

for PAL and 720x480, 704x480,

640x480, 544x480, 480x480,

384x480, 352x480 for NTSC.

Audio sampling rates can be

set to: 32 kHz, 44.1 kHz or 48

kHz and audio output rates:

128, 256 or 384 kbps.

Audio options are the next

menu item. Here you can

set it to stereo, joint stereo,

dual or mono. The last menu

items in the channel settings

are the channel output bitrate

(video+audio together) with

the setting range from 1

Mbps to 15 Mbps and PID

settings. PID settings allow

you to set the PID values for

video, audio, PCR and PMT of

a channel.

When you are finished with

the channel settings, you

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DATA

TECHNICAL

Manufacturer SICHUAN JIUZHOU ELECTRONIC TECHNOLOGY CO., Ltd.

No. 16, Yuejin Road, Mianyang, Sichuan Province, China

Web www.jiuzhoutech.com/

Phone +86-816-2469 300

Fax +86-816-2469 411

Model DVE-4Q

Function 4-Channel MPEG-2 Encoder

Video input (CVBS) Level 1.0Vp-p, 75ohm, BNC connector

Audio input Level 2.0Vp-p, 600ohm, BNC connector

Output standard ASI

Output level 800mV10%

Output bitrate 1~100Mbps tunable ( each channel 1~15Mbps tunable)

Video coding Complying to ISO11172 and ISO13818 (MPEG-2), 4:2: 0 MP@ML

Audio coding MPEG-1 Lay II, CD audio quality

Dimensions 44mmx480mmx320mm

Temperature 0~+50C (Operating), -20~+70C(Storage)

Power supply 220VAC10%, 50~60Hz, 30W

Jacek PawlowskiTELE-satellite

Test CenterPoland

TELE-satellite World www.TELE-satellite.com/...

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Available online starting from29 January 2010

Download this report in other languages from the Internet:

44 TELE-satellite Global Digital TV Magazine 02-03/2010 www.TELE-satellite.com

+DVE-4Q is simple, very flexible and good quality

MPEG-2 encoder which can be successfully used

in digital tv head ends - especially local cable or

terrestrial networks. It is suitable for both PAL and

NTSC standard definition signals. Every resolution,

sampling rate or audio output bitrate specified in

DVB standard are supported and the channel and

multiplex bitrates can be set freely.

-Transport streams used for satellite transmissions usually needto have more options set that DVE-4Q can do, for example: channel

name or event name. So if this encoder is to be used in a full fea-

tured satellite headend, its output would have to be still processed

digitally before being fed to the QPSK modulator.

Expert Opinion

Only in the headend station right at the output of a good modulator,one can see such perfect signal-to-noise performance

The constellation diagram reveals that the signal is very clean

(noiseless)

can move on to the multiplex

settings. They are not that

extended as the channel set-

tings. In this menu, you can

select which channels are

to be included in the multi-

plex (transport stream). The

next setting of the multiplex

is the total output bitrate of

the transport stream. Its set-

ting range is from 1 Mbps

to 54Mbps. Of course, you

should set the total bitrate

larger than the sum of the

channel bitrates.

The following menu item

allows you to choose if the

SDT table is included in the

stream or not and the lastitem in the multiplex setting

is the transport stream ID

number.

The next menu system

settings is used to set local

area network parameters: IP

address, submask and gate-

way. The last item in this

menu is the reset to factory

defaults.

Finally the last menu Warn-

ing Information is used only

if the red status LED lights up.

In this way we can check what

the reason of an error was.

PerformanceTo check the performance

of the DVE-4Q encoder, we

connected it to a DVB-T mod-

ulator. As the input, we used

DVD player and the outputs

of satellite receivers. The

encoder started to operate

without any problem.

With the default settings

the quality of output signal

was extraordinary good what

you can see in the attached

pictures. CBER better than

1x10-5 is something you can

not see too often. The encoder

created signal in various res-

olutions in accordance to our

setting.

Except for video resolu-

tion, also the channel bitrate

has enormous impact of thepicture quality we see on the

tv-set. When we decreased it

below about 1.5 Mbps heavy

picture distortion were visible

especially during the change

of a scene. Normally, the

lower the bitrate the cheaper

the transmission is. However

you should not decrease it

too much because the view-

ers will notice the distortions.

Having an encoder as flexible

as DVE-4Q, one can easily set

the proper settings for him-

self.

During the whole test, DVE-

4Q worked flawlessly. It cre-

ated transport stream with

very good quality digital video

and audio unless our settings

were deliberately low.