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LFI- 10 User Guide
Introduction
The LFI-10 is a digital audio format interface which enables viewing and
editing of auxiliary data embedded in a digital audio data stream. When
placed in line between two pieces of digital audio equipment, this simple
interface allows you to convert from one audio format to another, or to view
and modify the auxiliary data embedded in the digital audio bitstreams. The
LFI-10 provides front-panel indication of all data error types (CRCC, Validity,
Parity) with internal error counters for each, and gives you access to all 24
bytes of the Channel Status and User blocks in the AES/EBU and S/PDIF data
streams. The unit provides access to the emphasis and dub-prohibit bits in
the SDIF-2 data stream and allows adjustment of the input and output word
clocks relative to the
i~ut
and output serial data on the SDIF-2 interface.
When the current interface standards (AES/EBU*, S/PDIF** or SDIF-2) are
poorly specified or only partially implemented, the LFI-1 0 provides a simple
tool to view and edit the digital data, allowing you to find and eliminate
communications problems.
This manual provides some basic information on digital audio (Chapter 2) but
assumes the user will be familiar with the digital audio interface formats
handled by the LFI-1 O. We have attempted to include information about these
formats which is relevant to the use of the unit, but including the interface
specifications in their entirety is beyond the scope and the authority of this
manual. Where more detailed information is required, particularly with regard
to the AES formats, we refer you to:
Standards Secretariat
Audio Engineering Society, Inc.
60 East 42nd Street, Room 2520
New York, NY 10165 USA
Information on specific data which may be required by any target device
should be obtained from the manufacturer.
Lexicon has attempted to provide correct information and functional capability
corresponding to digital audio standards known and available to us at the time of
publication of this document and manufacture of this instrument. As standards
evolve, Lexicon may make updates to documentation and/or system software
available for purchase.
Lexicon's warranty on this product excludes consequential damages resulting from
the use of this product in the recording or transfer of digital audio. Local jurisdiction
may extend the user additional rights .
•
AESIEBU Intenace (Professional)
The AES/EBU
interlace conforms
to both
the
AES ANSI S4.40·1985
specification and the EBU
document,
Tech
3250·E.
Both
inputs
and outputs
are balanced,
transformer-coupled
desi,ans,
with a
temale XLR
in.IW.t
and a male
,XNLR
output,
conforming-to
the"standard convention of
IEG26s;-Pl[~ and output
levels
cOriijlJy
with
GGITT V.11
.
As
a
ovemb er 20,
1991
,
new
versions of 1he
professional digital audio format
specifications
were under
review
by
AES
,
EBU and IEC.
Until
new
specifications
are published, this device must
conform
to
currently
approved
specifications.
On this
device,
the professional form
of the
digital
audio
and
auxiliary data
has
been
labeled
"AES/EBU
"
in accordance with general
usage
.
•• S/PDIF - Sony/Phlflfps Dlgllallntenace Format (Consumer)
The S/PDIF
interface conforms
to the
Ghannel Status Type
II format. as
specified in
the EIAJ GP-340 Digtial Audio Interface
Standard, dated September, 1987, and to lEG 958, First Edition
t989-03.
As
of
November
20
,
1991, amendments
to lEG 958,
which include
specifications
for
the
implementation
of auxiliary
data
for
the
consumer format,
were under review.
Until new
speCifications
are
published,
this device must conform to
currently approved specifications.
On
this
device, the
consumer
form
of the
digital audio
and
auxiliary data has been labeled
uS/POIFu
in
accordance wrth general
usage.
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