Black Box AC082A Manuel utilisateur

CUSTOMER

SUPPORT

INFORMATION

Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX

FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746

Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

Web site: www.blackbox.com • E-mail: [email protected]

AUGUST 1993

AC082A

Dual System Video Converter

UNDERSCAN

NORMAL

FL ICKER REDUCTION

NORMAL

FREEZE IMAGE

NORMAL

POWER

LOCK

FCC AND IC STATEMENTS, TRADEMARKS

FEDERAL COMMUNICATIONS COMMISSION

AND

INDUSTRY CANADA

RADIO FREQUENCY INTERFERENCE STATEMENT

This equipment generates, uses, and can radiate radio frequency energy

and if not installed and used properly, that is, in strict accordance with the

manufacturer’s instructions, may cause interference to radio

communication. It has been tested and found to comply with the limits for a

Class A computing device in accordance with the specifications in Subpart B

of Part 15 of FCC Rules, which are designed to provide reasonable protection

against such interference when the equipment is operated in a commercial

environment. Operation of this equipment in a residential area is likely to

cause interference, in which case the user at his own expense will be required

to take whatever measures may be required to correct the interference.

Changes or modifications not expressly approved by the party responsible

for compliance could void the user’s authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for Radio noise emission from

digital apparatus set out in the Radio Interference Regulation of Industry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les

limites applicables aux appareils numériques de la classe A prescrites dans le

Règlement sur le brouillage radioélectrique édicté par Industrie Canada.

TRADEMARKS

Black Box and the logo are registered trademarks of Black Box

Corporation.

RCA®is a registered trademark of General Electric Co.

UL®is a registered trademark of Underwriters Laboratories Incorporated.

Mac®is a registered trademark of Apple Computer, Inc.

Macintosh®is a registered trademark of Apple Computer, Inc.

Sharp®is a registered trademark of Sharp Corporation.

Any other trademarks mentioned in this manual are acknowledged to be the property

of the trademark owners.

DUAL SYSTEM VIDEO CONVERTER

Table of Contents

Chapter Page

1. Specifications .......................................................................................... 3

2. Introduction ........................................................................................... 4

3. Installation .............................................................................................. 5

3.1 Initial Steps ...................................................................................... 5

3.2 Hooking Up Video Output ............................................................. 5

3.3 Selecting Your Video Standard ....................................................... 6

3.4 Final Preparations ............................................................................. 6

4. Operation ............................................................................................... 7

4.1 Indicators ......................................................................................... 7

4.2 Front-Panel Controls......................................................................... 7

4.3 Operational Parameters .................................................................. 8

5. What to Expect from Converted Computer Images ............................ 9

6. Troubleshooting ................................................................................... 11

Appendix A: S-Video, the Improved Quality Video Standard ................... 12

Appendix B: Connector Pinouts ................................................................. 13

CHAPTER 1: Specifications

Video Input Standards — VGA or Mac®

Video Output Standards — VGA or Mac; NTSC or PAL: Composite video,

S-Video, RGBS

Modes Supported — All VGA: 200, 350, 400, and 480 line

Mac: 640 x 480

Up to 16.8 Million Colors (24-bit Color)

Controls — (1) rear-mounted slide switch: NTSC/PAL

(3) front-mounted toggle switches: Underscan,

Flicker Reduction, Freeze Image

Indicators — LEDs: (1) Power, (1) Lock

Connectors —

Computer Input: HD-15S

Computer Output: HD-15S

(buffered pass-through of input)

Composite Video Output: RCA

Phono Jack

S-Video Output: 4-Pin Mini-DIN Jack

Expansion/RGB Output: HD-26S

Power — Separate Universal AC Power Supply

Input: 95 to 250 VAC, 47 to 63 Hz

Output: 5 VDC @ 3.8 A

Regulatory Approvals: UL®, CSA, and TUV

Size — Converter: Width: 7.25" (18.4 cm)

Height: 1.5" (3.8 cm)

Depth: 6.25" (15.9 cm)

Power Supply: Width: 2.75" (6.9 cm)

Height: 1.5" (3.8 cm)

Depth: 4.75" (12.1 cm)

Weight — 2.9 lb. (1.3 kg) (includes power unit)

1. Specifications

DUAL SYSTEM VIDEO CONVERTER

VERVIEW

The Dual System Video Converter

will enable you to convert your

computer monitor signal into a

form suitable for VCR recording,

conventional TV or video monitor

display, or integration into a

multimedia production system.

The Dual System Video Converter

is a plug-and-play unit. After you

have connected it to your equip-

ment, you are ready to go.

By adding the Sync Genlock

(available separately), you can

have full studio timing capability,

providing control over both

subcarrier and horizontal timing.

ACKAGE

ONTENTS

• Dual System Video Converter

• Universal input power supply

• AC line cord for North America or

Continental Europe

• 6-foot

(1.8-m)

VGA computer input cable

• 6-foot

(1.8-m)

Mac computer input cable

• 8-inch (20.3 cm) Macintosh

monitor

adapter cable

• 12-foot

(3.7-m)

composite video output

cable

• 12-foot (3.7-m) S-Video output cable

• This manual

OPTIONAL ACCESSORIES

• Sync Genlock

• 12-foot (3.7-m) BNC adapter cable,

Sharp

projector cable, or SCART cable:

for the Converter’s RGB/Expansion

output

• RF Modulator for North America

channels 3 and 4

2. Introduction

OUTPUTS NTSC PAL

COMPUTERS-VIDEO VIDEORGB/EXPANSION COMPUTER IN POWER

GENLOCK

SYNC

TO SCAN CONVERTER

EXPANSION PORT

BLUEGREENREDOUTIN

OUTPUTS

Figure 1. The Dual System Video Converter allows you to output your

computer monitor signal to three video devices.

Optional Sync Genlock (AC083A)

(with HD26 to HD26 expansion cable) Dual System Video Converter

Reference

(Black Burst)

Video

Projector

Video

Monitor

VCR

Computer

Monitor

Computer

Output

Power

Supply

Chroma

Keyer or

RGB

Monitor

optional

CHAPTER 3: Installation

3.1 Initial Steps

1. Disconnect your monitor (if it

is connected) from the monitor

port on your computer.

2. Connect one end of the provided

6-foot cable to the monitor port

on your computer. Connect the

other end in to the connector on

the rear panel of your Converter

labeled COMPUTER IN. See

Figure 2.

3. If you want your monitor to

continue to display, connect it

to the output connector labeled

COMPUTER on the rear panel

of the Converter. See below for

a description of this output.

Note for Macintosh users: Attach

one end of the 8-inch Macintosh

adapter to the Converter, the

other to your cable that connects

to your monitor. Do not use your

cable to connect your Mac

computer to the COMPUTER IN

connector on the Converter.

4. Attach the power supply provided

with the Converter to the

connector labeled POWER. Plug

the AC-line cord into an outlet to

provide power to the Converter.

The front-panel red POWER

indicator should light. (If you

ever need an AC-line cord specific

to another country, please call

your sales representa-tive in

that country.)

3.2 Hooking Up Video Output

Now connect one or more of the

Converter’s four output ports to

your video equipment: All outputs

are available at the same time.

Unused outputs do not have to

be terminated.

COMPUTER: This output is a

pass-through of the COMPUTER IN

input. You can connect a standard

computer monitor (or a multi-sync

monitor if your system supports it)

to this output.

VIDEO: Feed this single

composite-video output signal into

the “video” input jacks on ordinary

TVs, monitors, VCRs, or profes-

sional video equipment by using

the included composite-video cable.

This signal cannot be fed into the

“antenna” input of a television

or VCR.

S-VIDEO: Called S-Video, S-VHS,

or Y/C, this output is an advanced

form of video which carries the bright-

ness and color parts of images on

two separate signals. It is compatible

with the Hi-8 and Beta-ED standards.

Feed it into compatible equipment

by using the included S-Video cable

and you’ll get a better-quality picture

than the VIDEO output can provide.

3. Installation

DUAL SYSTEM VIDEO CONVERTER

RGB/EXPANSION: This premium-

quality output, which can be used by

some video projectors and monitors,

consists of separate red, green, blue,

and sync signals. Feed the signal into

compatible equipment by using our

optional RGBS cable with BNC

connectors, European SCART

connectors, or connectors for

Sharp LCD projectors. Call Black

Box to order these cables.

3.3 Selecting Your Video Standard

Use the NTSC/PAL slide switch on

the back of your Converter to choose

which standard you’ll use for the

VIDEO, S-VIDEO, and RGB outputs.

NTSC is the video standard for the

USA, Canada, Mexico, Japan, and

parts of South America. PAL is used

throughout most of Europe, the

Middle East, Southern Asia, and

the Pacific Rim.

3.4 Final Preparations

Turn on your computer. The green

indicator labeled LOCK on the

Converter’s front panel should light,

showing that the Converter is

receiving a proper signal from the

computer. (Refer to the next chapter

for an explanation of this indicator.)

Make sure the FREEZE IMAGE

switch on the front panel is in the

NORMAL position, so that your

computer-image sequences will flow

smoothly.

OUTPUTS NTSC PAL

COMPUTERS-VIDEO VIDEORGB/EXPANSION COMPUTER IN POWER

Figure 2. Rear panel of the Dual System Video Converter.

Highest quality RGBS

at 15.75 kHz (also

Genlock Sync)

S-Video for separate,

clearer Y/C video signals

Baseband video signal

for standard video

equipment

NTSC/PAL switch for

selecting the appropriate

video standard

Buffered Mac or VGA

video signal for local

computer monitor

Mac or VGA video

signal input from

computer

Power supply

(line cord from

transformer

connects here)

CHAPTER 4: Operation

4. Operation

Operating your Dual System Video

Converter is very simple. There are

few controls to adjust and no hidden

DIP switches to set. The Converter

will feel warm when operating. This

is normal. To avoid overheating, do

not place any object on top of the

Converter.

4.1 Indicators

The red POWER indicator lights up

when your Converter is receiving DC

power. If this light is glowing dimly

or not at all, there might be

something wrong with the external

power supply. See Chapter 6.

The green LOCK indicator lights

when the Converter is receiving a

valid computer signal through the

COMPUTER IN connector on its

rear panel. Which video-display

mode the Converter will use

depends on the monitor attached

to the COMPUTER port (see

Section 4.3).

4.2 Front-Panel Controls

UNDERSCAN: When this switch

is in the NORMAL position, images

that the Converter outputs in

Composite, S-Video, and RGBS

formats will fill the entire viewable

screen area. Because some monitors

“overscan” their screens, some

desirable parts of your images could

be cropped off of the screen. If this

is the case, flip this switch to the

UNDERSCAN position to shrink

the images, both horizontally and

vertically, approximately 10% in size.

FLICKER REDUCTION: When

this switch is in the NORMAL

position, the Converter sends images

using fully interlaced Composite,

S-Video, and RGBS video signals.

However, thin horizontal lines in

the images might appear to “flicker”

on and off at a very fast rate. This

annoying flicker, if present, can be

virtually eliminated by setting this

switch to the FLICKER REDUCTION

position. There is a trade-off with this

feature: you might notice a slight loss

of vertical resolution, detail, or

brightness.

FREEZE IMAGE: You might want

to freeze an image on the screen

without altering or discontinuing

your software application. If this

switch is moved to the FREEZE

IMAGE position, the image on the

Composite, S-Video, and RGBS

outputs is frozen. It will remain

frozen until you move the switch

back to the NORMAL position,

at which time whatever image is

currently being received through

COMPUTER IN will be displayed.

DUAL SYSTEM VIDEO CONVERTER

4.3 Operational Parameters

• If the computer input signal

is no longer present on

COMPUTER IN because the

computer has been turned

off or the input cable has been

disconnected, the image will

automatically “freeze” and the

LOCK indicator will go off.

• The COMPUTER output will

always display what is present

on the COMPUTER IN input,

regardless of the “display mode”

the computer may be in. If

COMPUTER IN is at 1024 x 768

resolution, COMPUTER output

will also be 1024 x 768. This is

not true of the

Composite

S-Video, and RGBS outputs:

images in Macintosh or “super

VGA” modes beyond 640 x 480

lines will appear scrambled and

out of sync.

• For Macintosh users: The Dual

System Video Converter only

supports hi-res 640 x 480 mode.

Some Mac models boot in hi-res

640 x 480 or low-res 512 x 384

depending on the type of

attached monitor. The

Converter makes use of this

capability: If a low-res monitor

is connected to its COMPUTER

output, it will force the

Macintosh to boot in 512 x 384

mode; but if a hi-res monitor (or

no monitor) is connected, it will

force 640 x 480. If the Mac is in

low-res 512 x 384 mode, the

Composite, S-Video, and RGBS

outputs will appear scrambled

and out of sync. You might

consider purchasing the Video

Converter (Mac Compatible)

(AC076A).

LOCK UNDERSCAN FLICKER REDUCTION FREEZE IMAGE

NORMALNORMALNORMALPOWER

Receiving power

when POWER is lit;

VGA or Mac signal

is OK at input

when LOCK is lit

Image is “shrunk” in both

the horizontal and vertical

directions when switch is in

UNDERSCAN position

Anti-flicker filter is

active when switch is in

FLICKER REDUCTION

position

Image is instantly

“frozen” when switch is

in FREEZE IMAGE

position

Figure 3. The front panel of the Dual System Video Converter.

CHAPTER 5: What to Expect from Converted Computer Images

We have included this section to give

you some insight into what you can

and should expect computer images

to look like once they are converted

to standard video. People are some-

times surprised that computer

images converted to video do not

look as sharp and vivid as they do

on the computer monitor. Although

this may be somewhat disappointing,

it should come as no surprise.

Color TV and video monitors, and

the conventional video standards

they use (NTSC and PAL), have

been with us since the 1940s and 50s.

When high-resolution computer-

graphics standards such as VGA or

Mac II were introduced less than a

decade ago, new display technologies

had been developed to achieve

higher detail and sharper colors.

Although many design improve-

ments have been made to TV

monitors and VCRs, they are still

limited to basic technologies that

are 40 years old.

Scan converters like the Dual System

Video Converter were created to

bridge the gap between the

dissimilar standards of computer

video and conventional video

equipment. They work, but the

trade-off is that you are taking

computer images whose sharpness

and detail are clearly visible on

today’s monitors and displaying them

on TVs, or recording them on VCRs,

that do not have comparable quality.

There are a few things you can do to

get the best image possible on your

TV/monitor or recorded on video

tape. The tips that follow will all

contribute to improved quality of

your display and/or VCR recording.

• In the world of video, black, white,

and all the shades of gray are not

processed the same way as “real

colors.” TVs and VCRs process

these shades with a minimum of

distortion. When it’s possible,

consider using grayscale images,

because they’ll be much sharper

than the equivalent colored

images.

• The “Christmas Effect” occurs

with computer images created by

artists who really like the green

and red color combination.

Nothing looks worse on a TV.

Try to avoid saturated colors.

5. What to Expect from Converted

Computer Images

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