Atec 764 User Manual

Features & Benefits

Two Balanced or Unbalanced
AES/EBU or SPDIF
Loopthrough Inputs Drive
Four-channel Level Meters

Adjustable Clip/Mute
Indicators

Audio Phase Display
Phase Correlation Meter
Unique Session Statistics

Compilation
VITC and LTC Time Code

Inputs
Channel Status and User

Data Decoding
AES-3 DARS Input
Optional Serial Digital Video

(Embedded Audio) Input
Optional Balanced Analog

Line Outputs
Supports a Pair of AES

Streams Output by
Professional DVTRs

Configurable Level Indicators
Support a Variety of Technical
Preferences

Mono Compatibility and
Sound-stage Monitoring
Assured via Phase Display

Clear Phase Indication
Regardless of Signal
Amplitude or Panning

Quality Control Certificate via
Session Statistics Compilation

Time Code Stamping of
Errors Pinpoints Audio
Needing Correction

Simple Viewing of Encoded
Channel Status and User Data

System Timing
Measurements to
Recognized Standard

Monitor Embedded Audio
Without an External
Demultiplexer

Monitor Sound via
Loudspeakers Without
External Converters

Applications

Digital Audio Monitoring in
Broadcast and Post
Production Facilities

Creative Adjustments in
Digital Audio Production

Digital Audio Monitor

764

The Tektronix 764 Digital Audio Monitor is an
advanced monitoring tool for production and
quality assessment in modern digital audio
facilities. It combines the features of a phase
and level meter with those of a digital audio
data monitor.The 764 provides technical
personnel with a setup and calibration tool
and production personnel with an operational
monitor capable of conventional and advanced
audio assessment tasks.

The 764 is well equipped for these tasks.
Easy-to-read display screens can be viewed
from across a room.An auxiliar y VGA output
supports larger color display units. Its two
AES/EBU input channels have loopthrough
capability permitting the 764 to be assigned
to any signal path. Operation follows an easy­to-use, menu-driven scheme.

Audio Level

Audio amplitude measurement results are
displayed on up to four bar graphs. Most
characteristics can be configured to user
preferences.This includes the amplitude scale
and ballistics, peak-hold characteristics and
the value of test and peak levels. Other
features include detection of digital clipping
and muting and detection of system errors.

Audio Phase

A Lissajous display is augmented with a
mathematical phase correlation meter.In
addition, selectable Sum and Difference bars
provide an additional phase assessment tool.

Time Code

The 764 features Time Code input and display
capabilities.Vertical Interval and Longitudinal
Time Code can be displayed for locating
specific audio passages.

Audio Monitors • www.tektronix.com/video_audio

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Digital Audio Monitor

764

System Timing

A Digital Audio Reference input,conforming to
AES recommendations, permits 764 users to
assess timing relationships between digital
audio signals. Common problems due to
sample slipping and non-locked signals can
easily be detected.

Status and User Data

Channel Status and User data are recovered
and displayed in contiguous 24-byte blocks.
This allows the content and format of these
auxiliary data channels to be monitored.

Optional Embedded
Audio Input

Embedded audio technology simplifies routing
of video and audio signals in broadcast and
post-production facilities, but places new
demands on audio monitoring equipment.To
eliminate the need for a separate digital audio
demultiplexing step for signal monitoring, the
Option 01 Embedded Audio Input adds a serial
digital video input to the standard digital audio
inputs of the 764. Once it extracts the digital
audio signal, the 764 provides the same
comprehensive monitoring capabilities as it
does for discrete AES/EBU audio.

The 764’s Embedded Audio Input option
extracts digital audio from 270 Mb/s serial
component signals and from 143 (525 line)
Mb/s serial composite signals.Audio data
up to 20 bits at a 48 kHz sample rate is
supported.

Optional Analog Line Outputs

Many applications require listening over
loudspeakers as a part of the audio monitoring
process. In digital facilities, an audio feed is
typically routed to a digital-to-analog
converter,which drives an amplifier and
speakers. Option 02 Analog Line Output
provides the digital-to-analog conversion
within the 764, eliminating the space
requirements and expense of external
conversion devices.

The balanced line output level can be either
fixed or variable (via the headphone Volume
control) and calibrated output level settings
are selectable by internal jumpers. Jumper
settings are also available for driving
unbalanced loads at low levels. Rear-panel
AES/EBU balanced output capability is lost
when this option is installed.

Common Applications

Consoles and workstations
DAT,D1, D2, D3, etc.
Digital STL for radio
A/D testing and alignment
Digital audio routers
Signal processing
Duplication and mastering

Audio Monitors • www.tektronix.com/video_audio

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Digital Audio Inputs 1/2, 3/4

Connector – XLR conforming to AES3-1992 and EBU 3250-E.BNC conforming to AES3-ID.
Signal Format – Balanced,24 data bits, 4 preamble bits, C,U,V and P bits.

MIN TYP MAX UNITS

Voltage range XLR 0.2 10 V

p-p

BNC 0.05 2 V

p-p

Impedance (0.1 to 6 MHz) XLR termination switched in 104.5 110 115.5 Ω
Return loss (0.1 to 6 MHz) XLR termination switched out 25 dB

BNC 25 dB

Sample rate range 27 52 kHz

Digital Audio Reference Input

Connector – XLR conforming to AES3-1992.BNC conforming to AES3-ID.
Signal Format – Balanced,24 data bits ignored, 4 preamble bits, C,U,V and P bits.

MIN TYP MAX UNITS

Voltage range XLR 0.2 10 Vp-p

BNC 0.05 2 Vp-p

Impedance XLR 104.5 110 115.5 Ω

BNC 71.25 75 78.75 Ω

Sample rate range 27 52 kHz

Digital Audio Monitor

764

Characteristics

Physical Characteristics

Dimensions cm in.

Height 13.3 5.25
Width 21.6 8.5
Depth 43.2 17

Weight kg lb.

4.5 10

Option 01 Embedded
Audio Input
Specifications

Serial Digital Video Input

Input Type– 75 Ω(nominal), BNC.
Serial Digital Video Formats Accepted– Audio

embedded per SMPTE 272M level B in the following
video formats: 270 Mb/s component digital (625–
and 525-line) complying with SMPTE 259M and
CCIR 656-1.

Input Level – 800 mV

p-p

±10%.

Return Loss – ≥15 dB, power on.
Equalization Range – Proper operation with up to

19.0 dB loss at 135 MHz using coaxial cable having
1/f- loss characteristics with a launch amplitude of
800 mV.

Serial Digital Video Output

Output Type– 75 Ω(nominal), BNC,active
loopthrough.

Output Level – 800 mV ±10%.
Return Loss – ≥15 dB.

Option 02 Analog Line
Output Specifications

Output Type– Balanced XLRs (2 channels).
Output Impedance – 50 Ω,nominal.

Frequency Response, 20 Hz to 20 kHz – ±2 dB.

THD+N (20 Hz to 20 kHz,22 kHz measurement
bandwidth) – <0.05%.

THD+N (at 1 kHz, 22 kHz measurement band­width, fixed or variable (volume control fully CW)
level outputs, 0 dBFS input, RL ≥10 kΩ)–

typically <0.005%.

Output Levels (0 dBFS,RL = 600 Ω)–

Fixed: 24 dBM +1.6, –0.0 dB.
Variable (volume control fully CW):24 dBM

+1.6, –0.0 dB.
Safety – UL3111-1, CSA1010.1,EN61010-1,

IEC61010-1.
EMC – UL1244.

Audio Monitors • www.tektronix.com/video_audio

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Vertical Interval Time Code Input

Connector – BNC, 75 Ω conforming to IEC461, NTSC and PAL specifications.
Signal format – Video with SMPTE VITC, 1 volt nominal.

Longitudinal Time Code Input

Connector – XLR.
Signal Format – Reads SMPTE and EBU LTC.

(Indicates time as hours:minutes:seconds.)

MIN TYP MAX UNITS

Voltage range 0.25 10 V

p-p

Impedance 5 kΩ

Level Meters

MIN TYP MAX UNITS

Range –90 0 dBFS

Accuracy Error

True peak,0 to –20 dBFS, steady tone 0.05 dB
Test level range –30 0 dB
Peak program level range –30 0 dBFS

Dynamic Response

True Peak Bar indicates true peak value (no attack delay).

Bar decay is same for PPM

PPM Bar indicates quasi-peak value; conforms to

IEC 268-10A & IEEE Std 152-1991

VU Bar has VU dynamic characteristic conforming

to IEEE Std 152-1991

Detectors MIN TYP MAX UNITS

Clip, sensitivity range 0 99 samples
Mute, sensitivity range 0 99 samples

Phase Display

MIN TYP MAX UNITS

Automatic gain control range –40 0 dBFS

Session Screen Display

MIN TYP MAX UNITS

Clip counter range 999 events
Mute counter range 999 events
Invalid samples 999 events
Parity errors 999 events
Code violations 999 events
Active bits 24 bits
DC offset range –90 dBFS

Ordering Information

764 DIGITAL AUDIO MONITOR

Includes instruction manual and power cord.

764 Options

Opt. 01 – Embedded audio input.
Opt. 02 – Analog line output.

764 Digital Audio Monitor Field
Upgrade Kit

764F01 – Embedded audio input kit for 764s with
serial numbers B020001 and higher.

Upgrades a 764 with serial number B020001 or higher
with embedded audio input processing.

Recommended Accessories

Plain Case – 1700F00.
Dual Rack Adapter – 1700F05.
Portable Case with Handle – 1700F02.
764 Service Manual – 070-8810-00.

Optional Accessories

Utility Drawer – 1700F07.
Blank Panel – 1700F06.
75 Ω Terminator – 011-0102-00.

.

Digital Audio Monitor

764

Copyright © 2001, Tektronix, Inc. All rights reserved. Tektronix products are
covered by U.S. and foreign patents,issued and pending.Information in this publi­cation supersedes that in all previously published material. Specification and price
change privileges reserved. TEKTRONIX and TEK are registered trademarks of
Tektronix, Inc. All other trade names referenced are the service marks, trademarks
or registered trademarks of their respective companies.

08/01 HB/XBS 21W-7269-3

Audio Monitors

•

www.tektronix.com/video_audio

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Sample Rate Measurement

MIN TYP MAX UNITS

Range 27 52 kHz
Resolution 10 Hz
Accuracy 10 Hz

Synchronization Measurement

MIN TYP MAX UNITS

Range ±50% frame

±64 U.I.

Power Supply

MIN TYP MAX UNITS

Input range 90 250 VAC
Input frequency 48 62 Hz
Consumption 56 65 Watts

Contact Tektronix

ASEAN Countries (65) 356-3900

Australia & New Zealand 61 (2) 9888-0100

Austria, Central Eastern Europe, Greece,

Turkey, Malta & Cyprus [phone]

Belgium [phone]

Brazil and South America 55 (11) 3741-8360

Canada 1 [phone]

Denmark [phone]

Finland [phone]

France & North Africa [phone]

Germany [phone]

Hong Kong (852) 2585-6688

India (91) 80-2275577

Italy [phone]

Japan (Sony/Tektronix Corporation)81 (3) 3448-3111

Mexico,Central America & Caribbean 52 (5) 666-6333

The Netherlands [phone]

Norway [phone]

People’s Republic of China 86 (10) 6235 1230

Poland (48) 22 251 5340

Republic of Korea 82 (2) 528-5299

South Africa (27 11) 254-8360

Spain & Portugal [phone]

Sweden [phone]

Switzerland [phone]

Taiwan 886 (2) 2722-9622

United Kingdom & Eire [phone]

USA 1 [phone]

For other areas, contact: Tektronix, Inc. at 1 [phone]

764 rear panel.