Contents

1 Introduction 2

2 Installation 42.1 Signal I/O 5

3 Configuration 83.1 Setting reference options 83.2 Selecting the output sample rate 103.3 Selecting test tones 113.4 Adjusting the 48kHz on-board oscillator 12

4 Status monitoring 14

5 Trouble shooting 16

6 Specification 18

Technical Manual 1

4404 Digital Audio Reference Signal Generator

1 Introduction

The 4404 is an AES11 digital audio reference signal (DARS) generator. It is designedto lock to a video reference or wordclock and provides eight continuous orinterrupted AES tones and two wordclock outputs.

The module may be used in the 1050 3U and 1051 1U ICON modular productrackframes with a choice of balanced or unbalanced rear connectors.

Characteristics of the 4404 are:

• eight outputs to AES11-1997 at 110Ω balanced or 75Ω unbalanced• switch configurable 1kHz or 500Hz audio tones to EBU R68 or SMPTE RP155.• left channel interrupted or continuous• alternative positive pulse outputs at 25Hz, 250Hz or video reference frame rate• analogue 525/625 video and wordclock reference inputs• two wordclock outputs• compatible with Pro-Bel COSMOS status monitoring

2 Issue 2

4404

DC POWERAND COSMOSSTATUS DATA

POWERREG

STATUSMON

ANALOGUE VIDEO/WORDCLOCK

REFERENCE

8 AES 11OUTPUTS

EPROM(TEST

TONES)

AESENCODER

ReferenceProcessor

Reference errorReference error

TWOWORDCLOCK

OUTPUTS

The 4404 digital audio reference generator

Technical Manual 3

4404 Digital Audio Reference Signal Generator

2 Installation

The 4404 digital audio reference generator fits in the 1050 3U and 1051 1U ICONmodular product rackframes. It is used with either the K4404.3B 30mm rear panelfor balanced digital audio outputs or the K4404.3U 30mm rear panel for unbalanceddigital audio outputs.

For module and rear connector installation please refer to the appropriate ICONrackframe section of the manual.

4 Issue 2

4404

RSF2

POLLPOWER

P

1X10PL7

2X5

TP5+12VTP4+5V

LOSS OF IP1

LOSS OF IP2

AUDIO LOCKVIDEO LOCKLOW REF

159 1009792898683807673706764595653

162167170173176179

186189192195198203206

SW1-1SW1-2SW1-3SW1-4

SW2-1SW2

SW1

SW2-2SW2-3SW2-4

0

0

1

1

4400_S1

FOR 5287 ONLY 2

10

RSF1

REF I/P

The 4404 digital audio reference generator

2.1 Signal I/O

The K4404.3U panel is equipped with BNC connectors for unbalanced digital audio,whilst the K4404.3B panel is equipped with a 25 way ‘D’ type connector for balanceddigital audio. Both panels have two BNC connectors for wordclock output and asingle BNC connector for the video/wordclock reference input.

Technical Manual 5

4404 Digital Audio Reference Signal Generator

K4404.3U

AES OUTVIDREFIN

WORDCLOCK

OUT

AESREFOUT

The K4404.3U rear panelfor unbalanced I/O

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4404

Signal I/O (AES REF OUT)Pin Function Pin Function

1 O/P1- 14 O/P5-

2 O/P1-+ 15 O/P5+

3 GND 16 GND

4 O/P2- 17 O/P6-

5 O/P2+ 18 O/P6+

6 N/C 19 N/C

7 N/C 20 N/C

8 GND 21 O/P7-

9 O/P3- 22 O/P7+

10 O/P3+ 23 GND

11 GND 24 O/P8-

12 O/P4- 25 O/P8+

13 O/P4+

The K4404.3B rear panelfor balanced outputs

K4404.3B

AES OUTVIDREFIN

WORDCLOCK

OUT

AESREFOUT

Technical Manual 7

4404 Digital Audio Reference Signal Generator

3 Configuration

The 4404 may be configured for different test tone outputs and reference options.

3.1 Setting reference optionsThe module may be locked to either a 525/625 video or wordclock. Make theselection with SW2-3 and SW2-4.

Note: ‘1’ or ON is made with the switch slider pushed away from the card edge.

8 Issue 2

4404

POLLPOWER

VIDEO LOCKLOW REF

SW1-1SW1-2SW1-3SW1-4

SW2-1SW2

SW1

SW2-2SW2-3SW2-4

0

0

1

1

Video/wordclockreference select switches

4404 reference optionsSetting Description

SW2-40

1

Use wordclock reference if present

Use video reference if present

SW2-30

1

Video reference is 525

Video reference is 625

Configuring the reference terminationTo select video and wordclock reference and termination options use jumper PL5 as explained in the following table:

Technical Manual 9

4404 Digital Audio Reference Signal Generator

REF I/P

Video reference/ wordclocktermination jumpers,unbalanced75Ω terminationshown (default)

4404 terminationjumpers

Wordclock input or video reference termination modesPL5 settings Description

UNBAL Use for unbalanced signal

75R Use with unbalanced input to terminate signal with 75 Ω

BRIDGE Selects high impedance termination (Hi-Z)

BAL Use with balanced input

110R Use with balanced inputs to terminate signal with 110Ω

3.2 Selecting the output sample rateThe output sample rate is selected with SW2-1 and SW2-2 as described in thefollowing table:

Note: ‘1’ or ON is made with the switch slider pushed away from the card edge.

10 Issue 2

4404

POLL

VIDEO LOCKLOW REF

SW1-1SW1-2SW1-3SW1-4

SW2-1SW2

SW1

SW2-2SW2-3SW2-4

0

0

1

1

Sample rate select switches

4404 sample rate optionsSW2-2 SW2-1 S ample rate

0 0 44.1KHz

0 1 32KHz

1 0 Unassigned

1 1 48KHz

3.3 Selecting test tonesThe audio modulation of the test tones are set with SW1, levers 1 to 4 as described in the following table:

Note: ‘1’ or ON is made with the switch slider pushed away from the card edge.

Technical Manual 11

4404 Digital Audio Reference Signal Generator

Selecting test tones (SW1)Function 1-1 1-2 1-3 1-4

1KHz@-18dB FS continuous left and right 0 0 0 0

500Hz@-18dB FS continuous left and right 1 0 0 0

1KHz@-20dB FS continuous left and right 0 1 0 0

500Hz@-20dB FS continuous left and right 1 1 0 0

1KHz@-18dB FS left interrupted and right continuous 0 0 1 0

500Hz@-18dB FS left interrupted and right continuous 1 0 1 0

1KHz@-20dB FS left interrupted and right continuous 0 1 1 0

500Hz@-20dB FS left interrupted and right continuous 1 1 1 0

Silence both channels 0 0 0 1

Silence both channels 1 0 0 1

Silence both channels 0 1 0 1

Silence both channels 1 1 0 1

Positive pulse@25Hz 0 0 1 1

Positive pulse@25Hz 1 0 1 1

Positive pulse@video frame rate 0 1 1 1

Positive pulse@250Hz 1 1 1 1

POLLPOWER

SW1-1SW1-2SW1-3SW1-4

SW2-1SW2

SW1

SW2-2SW2-3SW2-4

0

0

1

1

Tone select switch

3.4 Adjusting the 48kHz on-boardoscillator

In the absence of any reference the on-board screened PLL will run at 48kHz ±50ppm. This is set at the factory by RV1 and should not require readjustment.

12 Issue 2

4404

RSF2

807673706764595653

179

186189192195198203206

RSF1

RV1, PLL set frequency control on the 4404

Technical Manual 13

4404 Digital Audio Reference Signal Generator

4 Status monitoring

The status monitoring circuit, will provide the following information to the statusmonitoring controller:

• module present• video standard• video locked• audio locked• external video reference present• SW 1 status• SW 2 status• power OK In addition, the module is programmed with the following information, which can be read by the status monitoring controller:

• Module type• Module bar code• Module issue noFor further details of the Pro-Bel status monitoring system please refer to theCOSMOS status monitoring manual.

14 Issue 2

4404

Technical Manual 15

4404 Digital Audio Reference Signal Generator

5 Trouble shooting

The green card edge POWER LED is not lit

• check the PSU indicator to confirm that there is power to the frame• check the resettable fuses protecting the card - do this by removing the power

to the card for about 30 seconds then restoring the power

• if necessary, refer to the power supply trouble shooting guide in the appropriateICON rackframe manual section

There are no output signals

• ensure that the green power LED on the front of the main card is lit

The output signal seems corrupted

• if a wordclock reference is used, check that the green AUDIO LOCK LED is lit• if an analogue video reference is used check that the green VIDEO LOCK LED is lit• check that the red LOW REF LED is not lit• check that the appropriate termination has been set• check that the appropriate video standard has been selected• check that the appropriate sample rate has been selected

The output signals cause pops and clicks in downstream equipment

• check that the reference used has the same phase and frequency as all otherdigital audio equipment used in the system

Note: It is recommended to employ a common station video reference or a commonAES11 reference for all digital audio equipment if accurate phasing to station signals is required throughout a facility. The 4404 should meet the timing requirements ofAES11 under these conditions.

16 Issue 2

4404

Technical Manual 17

4404 Digital Audio Reference Signal Generator

POLLPOWER

LOSS OF IP1

LOSS OF IP2

AUDIO LOCKVIDEO LOCKLOW REF

SW1-1SW1-2SW1-3SW1-4

SW2-1SW2

SW1

SW2-2SW2-3SW2-4

0

0

1

1

4404 status indicators

4404 status indicatorsLED label Meaning when lit

LOW REF Lights red to show that reference level is too low - check termination value

VIDEO LOCK Lights green to show that audio clock is locked to video reference

AUDIO LOCK Lights green to show that audio clock is locked to wordclock reference

POWER Lights green if all voltage rails present

6 Specification

Inputs (reference)

Number and type: 1, analogue video reference conforming to ITU-R624-3 (625 line) or SMPTE 170M (525 line) orwordclock

Termination: High, 75Ω or 110Ω

Outputs (AES11)

Number and type: 8, balanced, transformer coupled to AES11-1997or unbalanced to AES3-id.

Outputs (wordclock)

Number and type: 2, 1 volt p-p into TTL, capacitively coupled,unbalanced. High level for left channel.

Performance

Functions: Fully meets requirements of AES 11 for jitter,timing and phasing

Sample rate: 32, 44.1 or 48kHz

Test tones

1KHz and 500Hz @-18dBFS continuous left andright

1KHz and 500Hz @-20dBFS continuous left andright

1KHz and 500Hz @-18dBFS left interrupted andright continuous

1KHz and 500Hz @-20dBFS left interrupted andright continuous

Digital silence both channels

Positive pulse @ 25Hz, 250Hz or video frame rate

18 Issue 2

4404

Temperature range

Operating: 0° to +40°C

Storage: -10°C to +70°C

Technical Manual 19

4404 Digital Audio Reference Signal Generator