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
1
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
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