1468 Chapter 39
1 1 1 International Telegraph and Telephone Con-
sultative Committee (CCITT) J.17 emphasis
(with 6.5 dB insertion loss at 800 Hz).
Receiver may not be manually overridden.
All other possible states of bits 2–4 are reserved and
are not to be used unless defined by the AES in the
future.
Bit 5 0 Lock not indicated. This is the default.
1 Source sampling frequency unlocked.
Bits 6–7 Encoded Sampling Frequency (See Notes 2, 3 and 4.)
Bit 6 7
State 0 0 No sampling frequency indicated. This is the
default. Receiver defaults to 48 kHz, and
automatic sampling rate determination or
manual override is enabled.
0 1 48 kHz sampling rate. Automatic sampling
rate determination or manual overrides are
disabled.
1 0 44.1 kHz sampling rate. Automatic sampling
rate determination or manual overrides are
disabled.
1 1 32 kHz sampling rate. Automatic sampling
rate determination or manual overrides are
disabled.
Note 1. Other than the use of the Channel Status block of informa-
tion, the rest of the data format is identical between the AES3
“professional use” Standard and the IEC 60958-3 “consumer use”
Standard. The electrical format is different, however. For these
reasons it should never be assumed that a “consumer use”
receiver would function correctly with a “professional use” trans-
mitter, or vice versa.
Note 2. It is not a requirement that the sampling frequency used
be indicated by these bits, nor is the use of one of the sampling
frequencies that can be indicated by these bits. If the transmitter
does not support sampling frequency indication, the sampling fre-
quency is unknown, or the sampling frequency is not one that can
be indicated by these bits, then the bits should be set to 0 0. Bits
3–6 of Byte 4 of the Channel Status may indicate other possible
sampling rates.
Note 3. If a sampling rate is indicated, it may be modified by the
status of Bit 7 of Byte 4 of the Channel Status.
Note 4. If Bits 0–3 of Byte 1 indicate single channel double sam-
pling frequency mode, then the sampling frequency indicated by
Bits 6 and 7 of Byte 0 is doubled.
Byte 1
Bits 0–3 Encoded Channel Mode
Bit 0 1 2 3
State 0 0 0 0 No mode indicated. Receiver defaults to two
channel mode but may be manually overrid-
den.
0 0 0 1 Two channel mode used. Receiver may not
be manually overridden.
0 0 1 0 Single channel (monophonic) mode used.
Receiver may not be manually overridden.
0 0 1 1 Primary/Secondary (subframe 1 is primary)
mode used. Receiver may not be manually
overridden.
0 1 0 0 Stereophonic (subframe 1 is left) mode used.
Receiver may not be manually overridden.Table 39-1. Channel Status Data Format Details
(Continued)
0 1 0 1 Reserved for user defined applications.
0 1 1 0 Reserved for user defined applications.
0 1 1 1 Single channel double sampling frequency
mode. Subframes 1 and 2 contain successive
samples of the same signal. Sampling fre-
quency is double the frame rate and double
the rate indicated in Byte 0 (if a rate is indi-
cated there), but not double the rate indicated
in Byte 4 (if a rate is indicated there).
Receiver may not be manually overridden.
Byte 3 may indicate channel number.
1 0 0 0 Single channel double sampling frequency
mode—left stereo channel. Subframes 1 and
2 contain successive samples of the same
signal. Sampling frequency is double the
frame rate and double the rate indicated in
Byte 0 (if a rate is indicated there), but not
double the rate indicated in Byte 4 (if a rate
is indicated there). Receiver may not be
manually overridden.
1 0 0 1 Single channel double sampling frequency
mode—right stereo channel. Subframes 1
and 2 contain successive samples of the
same signal. Sampling frequency is double
the frame rate and double the rate indicated
in Byte 0 (if a rate is indicated there), but not
double the rate indicated in Byte 4 (if a rate
is indicated there). Receiver may not be
manually overridden.
1 1 1 1 Multichannel mode. Byte 3 indicates the
channel numbers.
All other possible states of bits 0–3 are reserved and
are not to be used unless defined by the AES in the
future.
Bits 4–7 Encoded User Bits Management
Bit 4 5 6 7
State 0 0 0 0 No user information indicated—default.
0 0 0 1 192 bit block of user data, starting with the
Preamble “Z.”
0 0 1 0 Data to the AES18 Standard.
0 0 1 1 User defined.
0 1 0 0 Data to the IEC 60958-3 Standard.
All other possible states of bits 4–7 are reserved and
are not to be used unless defined by the AES in the
future.
Byte 2
Bits 0–2 Encoded use of auxiliary sample bits.
Bit 0 1 2
State 0 0 0 Maximum 20 bit audio words, auxiliary
sample bits usage not defined, default.
0 0 1 Maximum 24 bit audio words, auxiliary
sample bits used for audio.
0 1 0 Maximum 20 bit audio words, auxiliary
sample bits used for a coordination signal
per Annex A of AES3.
0 1 1 User defined applications.
All other possible states of bits 0–2 are reserved and
are not to be used unless defined by the AES in the
future.Table 39-1. Channel Status Data Format Details
(Continued)