Grass Valley 8920ADT User Manual

8920ADT

AUDIO A-TO-D CONVERTER WITH DELAY TRACKING

Instruction Manual

071806700

FIRST PRINTING: APRIL 2001

1.0software release

Contacting Grass Valley Group

Region Voice Fax Address Web Site

North America (800) 547-8949

530-478-4148

Paciﬁc Operations +852-2585-6688

Support: 852-2585-6579 U.K., Europe, Asia, Middle East +44 1753 218 777 +44 1753 218 757 France +33 1 45 29 73 00 Germany +49 221 1791 234 +49 221 1791 235

This document may not be copied, in whole or in part, or otherwise reproduced, except as specifically permitted under U.S. copyright law, without the prior written consent of Grass Valley Group, P.O. Box 599000, Nevada City, CA 95959-7900 USA. GRASS VALLEY GROUP is a registered trademark and Grass Valley is a trademark of Grass Valley Group. All registered trademarks and trademarks are property of their respective holders. Grass Valley Group products are covered by U.S. and foreign patents, issued and pending. Product options and specifications subject to change without notice. The information in this manual is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by Grass Valley Group. Grass Valley Group assumes no responsibility or liability for any errors or inaccuracies that may appear in this publication.

(530) 478-3347 Grass Valley Group

+852-2802-2996

P.O. Box 599000 Nevada City, CA 95959-7900 USA

www.grassvalleygroup.com

Preface

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

8920ADT Analog Audio to AES/EBU Converter with Delay Tracking

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Frame Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Module Placement in the 8900 Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Delay Control In/Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Reference Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Local Onboard Module Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Input Level Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Adjusting Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Configuring Output Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Remote Control Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Module Configuration Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Software Update Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Module Configuration Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Differential Input, Analog Gain and A/D Converters. . . . . . . . . . . . . . . . . . . . . 26

Digital Reference Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Routing and Control FPGA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Index

8920ADT Instruction Manual iii

Contents

iv 8920ADT Instruction Manual

Preface

About This Manual

This manual describes the features of a speciﬁc module of the 8900 Series Modular Products family. As part of this module family, it is subject to Safety and Regulatory Compliance described in the 8900 Series frame and power supply documentation (see the 8900TX/8900TF/8900TFN Frames

Instruction Manual ).

8920ADT Instruction Manual v

Preface

vi 8920ADT Instruction Manual

8920ADT Analog Audio to AES/EBU Converter with Delay Tracking

Introduction

The 8920ADT converts analog audio to digital and applies a ﬁxed and/or auto-tracking delay to the digital audio. The right and left channel audio inputs enter via a terminal block-to-BNC adapter on the rear panel. A delay control input is provided for inserting an RS-232 level auto-tracking signal from a frame synchronizer. An external reference of AES, 48 kHz Word Clock, or 525/625 video is required to lock the module. The reference signal is connected to loop-through input BNCs. The module outputs 2 AES/EBU unbalanced 75

The 8920ADT can modify the outgoing signal to provide channel swapping, channel summing, tone and phase inversion. The remote control capability supports mode selection, ﬁxed and auto-tracking delay, and input gain control (requires 8900NET module software version 2.1 or later). The 8920ADT features:

24-bit quantization,

■

Loop-through reference input accepts 48 kHz Word Clock, 525/625 Color Black, or AES3id signals,

48 kHz sampling rate,

■

Terminal block input and output via adapters,

■

Ω

signals through BNCs on the rear panel.

■

Independent input level control from +8 dBu to +28 dBu,

■

Fixed delay range in 2 ms steps, Auto-tracking from a Grass Valley video frame sync device,

■

Remote control via ethernet frame interface, and

■

Remote control lockout via onboard jumper.

8920ADT Instruction Manual 1

8920ADT Analog Audio to AES/EBU Converter with Delay Tracking

Installation

Installation of the 8920ADT module is a process of:

Placing the module in the desired frame slot, and

Cabling and terminating signal ports.

The 8920ADT module can be plugged in and removed from an 8900 Series frame with power on. When power is applied to the module, LED indicators reﬂect the initialization process (see Power Up on page 6).

Frame Capacity

The 8920ADT module can be installed in all 8900 Series frames but with varying maximum quantities determined by frame cooling capacity.

Table 1 provides the power capacity, cooling capacity, and maximum

module count for each frame type.

Table 1. Power, Cooling, and Module Capacity of 8900 Frames

Capacity Calculated

Power (W) 60 60 100 100 100 Recommended Module Cooling (W) 30 60 30 90 90 8920ADT Modules 10 10 10 10 10

Note

Module capacity ﬁgures assume no other modules are in the frame.

8900T2

Frame

Module Placement in the 8900 Frame

There are ten cell locations in the frame to accommodate either analog or digital modules. These are the left ten locations. Refer to Figure 1 on page 3.

The two cells on the right are allocated for the power supplies. For additional information concerning the Power Supply module, refer to the 8900 Frame manual.

The third cell from the right is allocated for the Frame Monitor or Network Interface controller modules. These modules provide health monitoring and control options.

8900T2-F

Frame

8900TX

Frame

8900TF

Frame

8900TFN

Frame

2 8920ADT Instruction Manual

Frame Monitor Module or Network Interface Module

Any 8900 Module

Power

Supplies

(only)

8067_04

Figure 1. 8900 Series Frame

Installation

DA10

J1 J2

J3 J4

U T

J5 J6

J7 J8

J9 J10

DA9

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

8900 modules are interchangeable within the module cells. There are 10 BNC connectors in each cell’s I/O group. The functional assignment of each connector in a group is determined by the module that is placed in that cell. The maximum number of modules an 8900 frame can accept is ten. Figure 2 illustrates the rear connector plate for an 8900 Series frame.

Figure 2. 8900 Series Frame Rear Connector

DA3

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA2

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

J1 J2

J3 J4

J5 J6

J7 J8

U T

DA8

J1 J2

J3 J4

U T

J5 J6

J7 J8

J9 J10

DA7

J1 J2

J3 J4

U T

J5 J6

J7 J8

J9 J10

DA6

J1 J2

J3 J4

U T

J5 J6

J7 J8

J9 J10

DA5

J1 J2

J3 J4

U T

J5 J6

J7 J8

J9 J10

DA4

J1 J2

J3 J4

U T

J5 J6

J7 J8

J9 J10

To install a module in the frame:

Insert the module, connector end ﬁrst, with the component side of the module facing to the right and the ejector tab to the top.

DA1

O U

J9 J10

8067-03

Verify that the module connector seats properly against the backplane.

Press the ejector tab in to seat the module in place.

8920ADT Instruction Manual 3

8920ADT Analog Audio to AES/EBU Converter with Delay Tracking

Cabling

Inputs

The 8920ADT receives a pair of balanced differential analog inputs (left and right channels) via the rear plug-in adapter connected to BNCs J1 – J4 as shown in Figure 3. Connect a balanced input source to the stereo pair input terminal block as speciﬁed in Table 2.

Table 2. Balanced Input Connections

Audio Channel Input Terminal Block

Left L +, GND, L –

Right R +, GND, R –

CAUTION The input signal must be balanced. Connecting an unbalanced input signal at

high signal levels may damage the input receivers.

Balanced

input adapter

L+

GND

L–

8920ADT

Grass Valley

Adapter

Figure 3.

Delay control in

Delay control out (buffered output)

Input/Output Connectors

DAx

R+

GND

R–

O U T

Reference

loop-through input

J10

AES output (+)

AES output (-)

8067_02

Balanced

output adapter

Grass Valley

Adapter

GND

–

4 8920ADT Instruction Manual

Outputs

The 8920ADT provides two unbalanced AES3id/EBU serial digital outputs J6 (AES Output +) and J8 (AES Output –). The module can be jumpered to use these outputs as a balanced differential AES3id output using the BNCto-terminal strip output adapter provided.

Connect balanced or unbalanced outputs as speciﬁed in Table 3.

Table 3. Output Connections

Unbalanced Outputs

Audio Channel BNC Connector Audio Channel Terminal Block

AES3id Output + AES3id Output – J8, – OUT

Delay Control In/Out

An RS-232 level control signal from a frame synchronizer can be connected to the Delay Control In BNC at J5 for auto-tracking audio delay. The Delay Control In signal is also buffered and sent to the Delay Control Out BNC at J7 so multiple units can be daisy chained to the frame synchronizer control line.

J6, + OUT

Installation

Balanced Outputs

Single balanced output +, GND, –

Reference Inputs

Loop-through input BNCs at J9 and J10 are provided for the required module reference. The reference signal can be an AES 48 kHz Word Clock, video reference (NTSC/PAL color black), or an AES3id signal. If the looping connector is not used, terminate the BNC into 75

Ω

8920ADT Instruction Manual 5

+ 25 hidden pages