The lower center of the display is not used in Consumer mode. In
Professional mode, it displays the signal’s destination, if the destination
is encoded in the status bits.
The lower right area displays the error flags. If any of the following
flags are active, the highlighted letter will be shown.
.
Confidence - This flag is set if the rising or falling edges of the
digital signal become too gradual. This is usually caused by
long cables or other bandwidth limiting in the transmission.
.
Lock - This flag is set if the AES receiver is unable to lock onto
the incoming sample rate. This usually means the sample rate
is unstable or out of the receiver’s range.
.
Coding - This flag indicates a violation of the biphase encoding
rules which are used in digital transmission. According to these
rules, the signal cannot remain in a high-voltage or low-voltage
state for more than two consecutive unit intervals (UI) except
during the preambles. Violation will result in a coding error.
.
Parity - This flag indicates that the parity bit does not match the
parity of the sample. The parity bit is set by the sending device
to indicate whether there are an even or odd number of 1’s in a
subframe. This is then checked against the received data by the
receiving device, and if they don’t match, the parity flag is set.
.
Validity - This flag is sent directly from the sending device to
indicate whether or not the data is valid. While the use of this
bit is not standardized, a common usage in tape recorders (for
example) is to set the bit to ‘Valid’ when the tape is playing and
‘Invalid’ when the tape is stopped. The flag shown on the
Status Bits panel indicates a state of ‘Invalid’.
The flags are shown in the lower right area of the display. If there are
no error flags set, the display shows ‘NO ERRORS’. If there are any
error flags, the letter highlighted above is shown. The position is also
important, since there are two flags designated with the letter ‘C’.
The flags are always shown in the same order (CLCPV), where the
first ‘C’ is for the Confidence flag and the second ‘C’ is for the Coding
flag. If any flag is set, its letter will be shown. If the flag is not set, there
will be a blank space in its letter position.
4 Functions
Function Descriptions Status Bits
ATS-1 Dual Domain User's Manual 4-49
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